LT1210 1.1A, 35MHz Current Feedback Amplifier FEATURES DESCRIPTION n 1.1A Minimum Output Drive Current The LT®1210 is a current feedback amplifier with high n 35MHz Bandwidth, A = 2, R = 10Ω output current and excellent large-signal characteristics. V L n 900V/µs Slew Rate, A = 2, R = 10Ω The combination of high slew rate, 1.1A output drive V L n High Input Impedance: 10MΩ and ±15V operation enables the device to deliver signifi- n Wide Supply Range: ±5V to ±15V cant power at frequencies in the 1MHz to 2MHz range. (TO-220 and DD Packages) Short-circuit protection and thermal shutdown ensure n Enhanced θ SO-16 Package for ±5V Operation the device’s ruggedness. The LT1210 is stable with large JA n Shutdown Mode: I < 200µA capacitive loads, and can easily supply the large currents S n Adjustable Supply Current required by the capacitive loading. A shutdown feature n Stable with C = 10,000pF switches the device into a high impedance and low sup- L n Operating Temperature Range: –40°C to 85°C ply current mode, reducing dissipation when the device n Available in 7-Lead DD, TO-220 and is not in use. For lower bandwidth applications, the sup- n 16-Lead SO Packages ply current can be reduced with a single external resistor. The LT1210 is available in the TO-220 and DD pack- APPLICATIONS ages for operation with supplies up to ±15V. For ±5V applications the device is also available in a low thermal n Cable Drivers resistance SO-16 package. n Buffers n Test Equipment Amplifiers All registered trademarks and trademarks are the property of their respective owners. n Video Amplifiers n ADSL Drivers TYPICAL APPLICATION Twisted Pair Driver Total Harmonic Distortion vs Frequency 15V –50 + VS = ±15V 4.7µF* 100nF N (dB)–60 VAOV U=T 4= 20VP-P O RT TI VIN +LT1210SD 21.15ΩW T1** C DISTOR–70 RL = 12.5Ω – RL ONI–80 RL = 10Ω 1 3 100Ω M 2.5W AR L H RL = 50Ω +4.7µF*–15V 100nF 845Ω TOTA–90 * TANTALUM –100 ** MIDCOM 671-7783 OR EQUIVALENT 1k 10k 100k 1M 274Ω FREQUENCY (Hz) 1210 TA01 1210 TA02 Rev C 1 Document Feedback For more information www.analog.com

LT1210 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage ..................................................... ±18V Specified Temperature Range (Note 4) Input Current ....................................................... ±15mA LT1210C ...................................................0°C to 70°C Output Short-Circuit Duration LT1210I ................................................–40°C to 85°C (Note 2) ..........................................Thermally Limited Junction Temperature ........................................ 150°C Operating Temperature Range (Note 3) Storage Temperature Range ..................–65°C to 150°C LT1210C ...............................................–40°C to 85°C Lead Temperature (Soldering, 10 sec) ...................300°C LT1210I ................................................–40°C to 85°C PIN CONFIGURATION TOP VIEW V+ 1 16 V+ FRONT VIEW V+ 2 15 NC FRONT VIEW 7 OUT 6543 VCVS–O+HMUTPDOWN OUVT+ 34 1143 VC–OMP 7654 C O OUMTPVV–+ ITSA VB+ 21 +–IINN –NINC 56 1121 S+IHNUTDOWN ITSA VB+ 321 S –IHNUT+DINOWN R PACKAGE NC 7 10 NC T7 PACKAGE 7-LEAD PLASTIC D TJMAX = 150°C, θJA = 25°C/WD V+ 8 9 V+ TJMAX 7=- L1E5A0D°C T, Oθ-J2C2 =0 5°C/W S PACKAGE 16-LEAD PLASTIC SO TJMAX = 150°C, θJA = 40°C/W (Note 5) ORDER INFORMATION http://www.linear.com/product/LT1210#orderinfo LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1210CR#PBF LT1210CR#TRPBF LT1210R 7-Lead Plastic DDPAK 0°C to 70°C LT1210IR#PBF LT1210IR#TRPBF LT1210R 7-Lead Plastic DDPAK –40°C to 85°C LT1210CS#PBF LT1210CS#TRPBF LT1210CS 16-Lead Plastic SOIC 0°C to 70°C LT1210CT7#PBF N/A LT1210CT7 7-Lead TO-220 0°C to 70°C Consult ADI Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. Rev C 2 For more information www.analog.com

LT1210 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = 0V, ±5V ≤ V ≤ ±15V, pulse tested, V = 0V, unless A CM S SD otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage ±3 ±15 mV OS l ±20 mV Input Offset Voltage Drift l 10 µV/°C I + Noninverting Input Current ±2 ±5 µA IN l ±20 µA I – Inverting Input Current ±10 ±60 µA IN l ±100 µA e Input Noise Voltage Density f = 10kHz, R = 1kΩ, R = 10Ω, R = 0Ω 3.0 nV/√Hz n F G S +i Input Noise Current Density f = 10kHz, R = 1kΩ, R = 10Ω, R = 10kΩ 2.0 pA/√Hz n F G S –i Input Noise Current Density f = 10kHz, R = 1kΩ, R = 10Ω, R = 10kΩ 40 pA/√Hz n F G S R Input Resistance V = ±12V, V = ±15V l 1.50 10 MΩ IN IN S V = ±2V, V = ±5V l 0.25 5 MΩ IN S C Input Capacitance V = ±15V 2 pF IN S Input Voltage Range V = ±15V l ±12 ±13.5 V S V = ±5V l ±2 ±3.5 V S CMRR Common Mode Rejection Ratio V = ±15V, V = ±12V l 55 62 dB S CM V = ±5V, V = ±2V l 50 60 dB S CM Inverting Input Current V = ±15V, V = ±12V l 0.1 10 µA/V S CM Common Mode Rejection V = ±5V, V = ±2V l 0.1 10 µA/V S CM PSRR Power Supply Rejection Ratio V = ±5V to ±15V l 60 77 dB S Noninverting Input Current V = ±5V to ±15V l 30 500 nA/V S Power Supply Rejection Inverting Input Current V = ±5V to ±15V l 0.7 5 µA/V S Power Supply Rejection A Large-Signal Voltage Gain T = 25°C, V = ±15V, V = ±10V, 55 71 dB V A S OUT R = 10Ω (Note 5) L V = ±15V, V = ±8.5V, R = 10Ω (Note 5) l 55 68 dB S OUT L V = ±5V, V = ±2V, R = 10Ω l 55 68 dB S OUT L ROL Transresistance, ∆VOUT/∆IIN– TA = 25°C, VS = ±15V, VOUT = ±10V, R = 10Ω (Note 5) 100 260 kΩ L V = ±15V, V = ±8.5V, R = 10Ω (Note 5) l 75 200 kΩ S OUT L V = ±5V, V = ±2V, R = 10Ω l 75 200 kΩ S OUT L V Maximum Output Voltage Swing T = 25°C, V = ±15V, R = 10Ω (Note 5) ±10.0 ±11.5 V OUT A S L l ±8.5 V T = 25°C, V = ±5V, R = 10Ω ±2.5 ±3.0 V A S L l ±2.0 V I Maximum Output Current (Note 5) V = ±15V, R = 1Ω l 1.1 2.0 A OUT S L I Supply Current (Note 5) T = 25°C, V = ±15V, V = 0V 35 50 mA S A S SD l 65 mA Supply Current, R = 51kΩ (Notes 5, 6) T = 25°C, V = ±15V 15 30 mA SD A S Positive Supply Current, Shutdown V = ±15V, V = 15V l 200 µA S SD Output Leakage Current, Shutdown V = ±15V, V = 15V l 10 µA S SD Rev C 3 For more information www.analog.com

LT1210 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. V = 0V, ±5V ≤ V ≤ ±15V, pulse tested, V = 0V, unless A CM S SD otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS SR Slew Rate (Note 7) T = 25°C, A = 2, R = 400Ω 400 900 V/µs A V L Slew Rate (Note 5) T = 25°C, A = 2, R = 10Ω 900 V/µs A V L Differential Gain (Notes 5, 8) V = ±15V, R = 750Ω, R = 750Ω, R = 15Ω 0.3 % S F G L Differential Phase (Notes 5, 8) V = ±15V, R = 750Ω, R = 750Ω, R = 15Ω 0.1 DEG S F G L BW Small-Signal Bandwidth A = 2, V = ±15V, Peaking ≤ 1dB, 55 MHz V S R = R = 680Ω, R = 100Ω F G L A = 2, V = ±15V, Peaking ≤ 1dB, 35 MHz V S R = R = 576Ω, R = 10Ω F G L Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 5: SO package is recommended for ±5V supplies only, as the power may cause permanent damage to the device. Exposure to any Absolute dissipation of the SO package limits performance on higher supplies. For Maximum Rating condition for extended periods may affect device supply voltages greater than ±5V, use the TO-220 or DD package. See reliability and lifetime. Thermal Considerations in the Applications Information section for details Note 2: A heat sink may be required to keep the junction temperature on calculating junction temperature. If the maximum dissipation of the below the Absolute Maximum rating. Applies to short circuits to ground package is exceeded, the device will go into thermal shutdown. only. A short circuit between the output and either supply may permanently Note 6: R is connected between the Shutdown pin and ground. SD damage the part when operated on supplies greater than ±10V. Note 7: Slew rate is measured at ±5V on a ±10V output signal while Note 3: The LT1210C/LT1210I are guaranteed functional over the operating on ±15V supplies with R = 1.5kΩ, R = 1.5kΩ and R = 400Ω. F G L temperature range of –40°C to 85°C. Note 8: NTSC composite video with an output level of 2V. Note 4: The LT1210C is guaranteed to meet specified performance from 0°C to 70°C. The LT1210C is designed, characterized and expected to meet specified performance from –40°C to 85°C but not tested or QA sampled at these temperatures. The LT1210I is guaranteed to meet specified performance from –40°C to 85°C. Rev C 4 For more information www.analog.com

LT1210 SMALL-SIGNAL BANDWIDTH R = 0Ω, I = 30mA, V = ±5V, Peaking ≤ 1dB R = 0Ω, I = 35mA, V = ±15V, Peaking ≤ 1dB SD S S SD S S –3dB BW –3dB BW A R (Ω) R (Ω) R (Ω) (MHz) A R (Ω) R (Ω) R (Ω) (MHz) V L F G V L F G –1 150 549 549 52.5 –1 150 604 604 66.2 30 590 590 39.7 30 649 649 48.4 10 619 619 26.5 10 665 665 46.5 1 150 604 – 53.5 1 150 750 – 56.8 30 649 – 39.7 30 866 – 35.4 10 619 – 27.4 10 845 – 24.7 2 150 562 562 51.8 2 150 665 665 52.5 30 590 590 38.8 30 715 715 38.9 10 576 576 27.4 10 576 576 35.0 10 150 392 43.2 48.4 10 150 453 49.9 61.5 30 383 42.2 40.3 30 432 47.5 43.1 10 215 23.7 36.0 10 221 24.3 45.5 R = 7.5kΩ, I = 15mA, V = ±5V, Peaking ≤ 1dB R = 47.5kΩ, I = 18mA, V = ±15V, Peaking ≤ 1dB SD S S SD S S –3dB BW –3dB BW A R (Ω) R (Ω) R (Ω) (MHz) A R (Ω) R (Ω) R (Ω) (MHz) V L F G V L F G –1 150 562 562 39.7 –1 150 619 619 47.8 30 619 619 28.9 30 698 698 32.3 10 604 604 20.5 10 698 698 22.2 1 150 634 – 41.9 1 150 732 – 51.4 30 681 – 29.7 30 806 – 33.9 10 649 – 20.7 10 768 – 22.5 2 150 576 576 40.2 2 150 634 634 48.4 30 604 604 29.6 30 698 698 33.0 10 576 576 21.6 10 681 681 22.5 10 150 324 35.7 39.5 10 150 348 38.3 46.8 30 324 35.7 32.3 30 357 39.2 36.7 10 210 23.2 27.7 10 205 22.6 31.3 R = 15kΩ, I = 7.5mA, V = ±5V, Peaking ≤ 1dB R = 82.5kΩ, I = 9mA, V = ±15V, Peaking ≤ 1dB SD S S SD S S –3dB BW –3dB BW A R (Ω) R (Ω) R (Ω) (MHz) A R (Ω) R (Ω) R (Ω) (MHz) V L F G V L F G –1 150 536 536 28.2 –1 150 590 590 34.8 30 549 549 20.0 30 649 649 22.5 10 464 464 15.0 10 576 576 16.3 1 150 619 – 28.6 1 150 715 – 35.5 30 634 – 19.8 30 768 – 22.5 10 511 – 14.9 10 649 – 16.1 2 150 536 536 28.3 2 150 590 590 35.3 30 549 549 19.9 30 665 665 22.5 10 412 412 15.7 10 549 549 16.8 10 150 150 16.5 31.5 10 150 182 20.0 37.2 30 118 13.0 27.1 30 182 20.0 28.9 10 100 11.0 19.4 10 100 11.0 22.5 Rev C 5 For more information www.analog.com

LT1210 TYPICAL PERFORMANCE CHARACTERISTICS Bandwidth and Feedback Resistance Bandwidth vs Supply Voltage Bandwidth vs Supply Voltage vs Capacitive Load for Peaking ≤ 1dB 100 50 10k 100 90 PEAKING ≤ 1dB AV = 2 PEAKING ≤ 1dB AV = 2 BANDWIDTH PEAKING ≤ 5dB RL = 100Ω PEAKING ≤ 5dB RL = 10Ω MHz) 7800 RF = 470Ω MHz) 40 RF = 560Ω CE (Ω) –3dB WIDTH ( 6500 RF = 560Ω WIDTH ( 30 RF = 750Ω SISTAN 1k 10 BANDW –3dB BAND 342000 RF = 680Ω RFR =F =7 510kΩΩ –3dB BAND 2100 RRFF == 12kkΩΩ FEEDBACK RE RAFEVLE ==D 2∞BACK RESISTANCE IDTH (MHz) 10 RF = 1.5kΩ VS = ±15V CCOMP = 0.01µF 0 0 100 1 4 6 8 10 12 14 16 18 4 6 8 10 12 14 16 18 1 10 100 1000 10000 SUPPLY VOLTAGE (±V) SUPPLY VOLTAGE (±V) CAPACITIVE LOAD (pF) 1210 G01 1210 G02 1210 G03 Bandwidth and Feedback Resistance Bandwidth vs Supply Voltage Bandwidth vs Supply Voltage vs Capacitive Load for Peaking ≤ 5dB 100 50 10k 100 90 PEAKING ≤ 1dB AV = 10 PEAKING ≤ 1dB AV = 10 PEAKING ≤ 5dB RL = 100Ω RL = 10Ω BANDWIDTH –3dB BANDWIDTH (MHz) 6345728100000000 RF =390Ω RRRRF FFF= === 1 436.5738k000ΩΩΩΩ –3dB BANDWIDTH (MHz) 32140000 RF = 680Ω RRRFF F = == 1 15.k56Ωk0ΩΩ FEEDBACK RESISTANCE (Ω) 1k RRCAVFEEVSCLSE O I===DSM +±∞TBP21AA =5NC V0CK.E01µF 10–3dB BANDWIDTH (MHz) 0 0 10000 1 4 6 8 10 12 14 16 18 4 6 8 10 12 14 16 18 1 10 100 1000 10000 SUPPLY VOLTAGE (±V) SUPPLY VOLTAGE (±V) CAPACITIVE LOAD (pF) 1210 G04 1210 G05 1210 G06 Differential Phase vs Differential Gain vs Spot Noise Voltage and Current Supply Voltage Supply Voltage vs Frequency 0.6 0.5 100 RF = RG = 750Ω DIFFERENTIAL PHASE (DEG) 00000.....54321 ARVF == R2G = 750Ω RRLL == 1550ΩΩ RRLL == 1300ΩΩ DIFFERENTIAL GAIN (%) 0000....4321 RRRLLL = == 151500ΩΩΩ RL A=V 3 =0 Ω2 SPOT NOISE (nV/√Hz OR pA/√Hz) 10 –+eiinnn 0 0 1 5 7 9 11 13 15 5 7 9 11 13 15 10 100 1k 10k 100k SUPPLY VOLTAGE (±V) SUPPLY VOLTAGE (±V) FREQUENCY (Hz) 1210 G07 1210 G08 1210 G09 Rev C 6 For more information www.analog.com

LT1210 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Current vs Supply Current vs Supply Voltage Ambient Temperature, V = ±5V Ambient Temperature, V = ±15V S S 40 40 40 3386 RSD = 0Ω TA = 25°C 35 RSD = 0Ω RAVL == 1∞ 35 RSD = 0Ω mA) 34 TA = 85°C mA) 30 mA) 30 RRENT ( 3320 RRENT ( 2250 RSD = 7.5kΩ RRENT ( 2250 RSD = 47.5kΩ SUPPLY CU 2286 TA = 125°C TA = –40°C SUPPLY CU 1150 RSD = 15kΩ SUPPLY CU 1150 RSD = 82.5kΩ 24 22 5 5 RAVL == 1∞ 20 0 0 4 6 8 10 12 14 16 18 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 SUPPLY VOLTAGE (±V) TEMPERATURE (°C) TEMPERATURE (°C) 1210 G10 1210 G11 1210 G12 Supply Current vs Input Common Mode Limit vs Output Short-Circuit Current vs Shutdown Pin Current Junction Temperature Junction Temperature 40 V+ 3.0 35 VS = ±15V –0.5 T (A) 2.8 N RRENT (mA) 322050 DE RANGE (V)–––211...050 RCUIT CURRE 22..64 SINKING SOURCING UPPLY CU 15 MMON MO 21..05 SHORT-CI 22..20 S 10 CO 1.0 UT P 5 0.5 OUT 1.8 0 V– 1.6 0 100 200 300 400 500 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 SHUTDOWN PIN CURRENT (µA) TEMPERATURE (°C) TEMPERATURE (°C) 1210 G13 1210 G14 1210 G15 Output Saturation Voltage vs Power Supply Rejection Ratio Supply Current vs Large-Signal Junction Temperature vs Frequency Output Frequency (No Load) V+ 70 100 TAGE (V) –––123 VS = ±15V RRLL = = 1 20kΩΩ ON (dB) 6500 NEGATIVE VRRSLF === R±510G5Ω =V 1kΩ mA) 9800 RVAVVSOL U===T 2±∞=1 250VVP-P OUTPUT SATURATION VOL –43214 RRL L= = 1 20kΩΩ POWER SUPPLY REJECTI 24310000 POSITIVE SUPPLY CURRENT ( 7654300000 V– 0 20 –50 –25 0 25 50 75 100 125 10k 100k 1M 10M 100M 10k 100k 1M 10M TEMPERATURE (°C) FREQUENCY (Hz) FREQUENCY (Hz) 1210 G16 1210 G17 1210 G18 Rev C 7 For more information www.analog.com

LT1210 TYPICAL PERFORMANCE CHARACTERISTICS Output Impedance in Shutdown Large-Signal Voltage Gain vs Output Impedance vs Frequency vs Frequency Frequency 100 10k 18 VS = ±15V AV = 4, RL = 10Ω CE (Ω) 10 IO = 0mARSD = 82.5kΩ CE (Ω) 1k E GAIN (dB) 1152 RVSF == 6±8105ΩV,, VRIGN == 252V0PΩ-P N N G A A A PUT IMPED 1 RSD = 0Ω PUT IMPED 100 GNAL VOLT 96 OUT 0.1 OUT 10 E-SI G R 3 A L 0.01 1 0 100k 1M 10M 100M 100k 1M 10M 100M 103 104 105 106 107 108 FREQUENCY (Hz) FREQUENCY (Hz) FREQUENCY (Hz) 1210 G19 1210 G20 1210 G21 3rd Order Intercept vs Frequency Test Circuit for 3rd Order Intercept 56 VS = ±15V 54 RL = 10Ω + m) RF = 680Ω dB 52 RG = 220Ω LT1210 PO T ( – EP 50 C ER 680Ω T 48 N R I DE 46 220Ω 10Ω R D O 44 MEASURE INTERCEPT AT PO R 3 42 1210 TC01 40 0 2 4 6 8 10 FREQUENCY (MHz) 1210 G22 Rev C 8 For more information www.analog.com

LT1210 APPLICATIONS INFORMATION The LT1210 is a current feedback amplifier with high out- 14 put current drive capability. The device is stable with large 12 VS = ±15V CL = 200pF RF = 3.4kΩ capacitive loads and can easily supply the high currents 10 NO COMPENSATION required by capacitive loads. The amplifier will drive low B) 8 RF = 1.5kΩ impedance loads such as cables with excellent linearity N (d 6 COMPENSATION AI at high frequencies. E G 4 G TA 2 L Feedback Resistor Selection VO 0 –2 The optimum value for the feedback resistors is a function –4 RF = 3.4kΩ COMPENSATION of the operating conditions of the device, the load imped- –6 ance and the desired flatness of response. The Typical AC 1 10 100 FREQUENCY (MHz) Performance tables give the values which result in less 1210 F01 than 1dB of peaking for various resistive loads and oper- Figure 1. ating conditions. If this level of flatness is not required, a higher bandwidth can be obtained by use of a lower Also shown is the –3dB bandwidth with the suggested feedback resistor. The characteristic curves of Bandwidth feedback resistor vs the load capacitance. vs Supply Voltage indicate feedback resistors for peak- Although the optional compensation works well with ing up to 5dB. These curves use a solid line when the capacitive loads, it simply reduces the bandwidth when response has less than 1dB of peaking and a dashed line it is connected with resistive loads. For instance, with a when the response has 1dB to 5dB of peaking. The curves 10Ω load, the bandwidth drops from 35MHz to 26MHz stop where the response has more than 5dB of peaking. when the compensation is connected. Hence, the com- For resistive loads, the COMP pin should be left open (see pensation was made optional. To disconnect the optional Capacitive Loads section). compensation, leave the COMP pin open. Capacitive Loads Shutdown/Current Set The LT1210 includes an optional compensation network If the shutdown feature is not used, the SHUTDOWN pin for driving capacitive loads. This network eliminates most must be connected to ground or V–. of the output stage peaking associated with capacitive The Shutdown pin can be used to either turn off the bias- loads, allowing the frequency response to be flattened. ing for the amplifier, reducing the quiescent current to Figure 1 shows the effect of the network on a 200pF load. less than 200µA, or to control the quiescent current in Without the optional compensation, there is a 6dB peak normal operation. at 40MHz caused by the effect of the capacitance on the output stage. Adding a 0.01µF bypass capacitor between The total bias current in the LT1210 is controlled by the output and the COMP pins connects the compensation the current flowing out of the Shutdown pin. When the and greatly reduces the peaking. A lower value feedback Shutdown pin is open or driven to the positive supply, resistor can now be used, resulting in a response which the part is shut down. In the shutdown mode, the output is flat to ±1dB to 40MHz. The network has the greatest looks like a 70pF capacitor and the supply current is typi- effect for C in the range of 0pF to 1000pF. The graphs of cally less than 100µA. The Shutdown pin is referenced to L Bandwidth and Feedback Resistance vs Capacitive Load the positive supply through an internal bias circuit (see can be used to select the appropriate value of feedback the Simplified Schematic). An easy way to force shutdown resistor. The values shown are for 1dB and 5dB peaking at is to use open-drain (collector) logic. The circuit shown a gain of 2 with no resistive load. This is a worst-case con- in Figure 2 uses a 74C906 buffer to interface between 5V dition, as the amplifier is more stable at higher gains and logic and the LT1210. The switching time between the with some resistive load in parallel with the capacitance. active and shutdown states is about 1µs. A 24kΩ pull-up Rev C 9 For more information www.analog.com

LT1210 APPLICATIONS INFORMATION quiescent current can be reduced to 9mA in the inverting 15V configuration without much change in response. In non- VIN + inverting mode, however, the slew rate is reduced as the LT1210 VOUT quiescent current is reduced. –SD RF –15V 5V 74C906 24kΩ RG ENABLE 15V 1210 F02 Figure 2. Shutdown Interface resistor speeds up the turn-off time and ensures that the LT1210 is completely turned off. Because the pin is referenced to the positive supply, the logic used should RF = 750Ω IQ = 9mA, 18mA, 36mA 1210 F04a have a breakdown voltage of greater than the positive RL = 10Ω VS = ±15V supply voltage. No other circuitry is necessary as the (a) AV = –1 internal circuit limits the Shutdown pin current to about 500µA. Figure 3 shows the resulting waveforms. VOUT ENABLE RF = 750Ω IQ = 9mA, 18mA, 36mA 1210 F04b RL = 10Ω VS = ±15V (b) A = 2 V AV = 1 RPULL-UP = 24k 1210 F03 Figure 4. Large-Signal Response vs IQ RF = 825Ω VIN = 1VP-P RL = 50Ω VS = ±15V Slew Rate Figure 3. Shutdown Operation Unlike a traditional op amp, the slew rate of a current feedback amplifier is not independent of the amplifier gain For applications where the full bandwidth of the amplifier configuration. There are slew rate limitations in both the is not required, the quiescent current of the device may be input stage and the output stage. In the inverting mode, reduced by connecting a resistor from the Shutdown pin and for higher gains in the noninverting mode, the signal to ground. The quiescent current will be approximately 65 amplitude on the input pins is small and the overall slew times the current in the Shutdown pin. The voltage across rate is that of the output stage. The input stage slew rate the resistor in this condition is V+ – 3V . For example, BE is related to the quiescent current and will be reduced as a 82kΩ resistor will set the quiescent supply current to the supply current is reduced. The output slew rate is set 9mA with V = ±15V. S by the value of the feedback resistors and the internal The photos in Figure 4 show the effect of reducing the qui- capacitance. Larger feedback resistors will reduce the escent supply current on the large-signal response. The slew rate as will lower supply voltages, similar to the way Rev C 10 For more information www.analog.com

LT1210 APPLICATIONS INFORMATION the bandwidth is reduced. The photos in Figure 5 show When the LT1210 is used to drive capacitive loads, the the large-signal response of the LT1210 for various gain available output current can limit the overall slew rate. In configurations. The slew rate varies from 770V/µs for a the fastest configuration, the LT1210 is capable of a slew gain of 1, to 1100V/µs for a gain of –1. rate of over 1V/ns. The current required to slew a capaci- tor at this rate is 1mA per picofarad of capacitance, so 10,000pF would require 10A! The photo (Figure 6) shows the large-signal behavior with C = 10,000pF. The slew L rate is about 150V/µs, determined by the current limit of 1.5A. RF = 825Ω VS = ±15V 1210 F05a RL = 10Ω (a) A = 1 V RF = RG = 3kΩ VS = ±15V 1210 F06 RL = ∞ Figure 6. Large-Signal Response, C = 10,000pF L Differential Input Signal Swing The differential input swing is limited to about ±6V by RF = RG = 750Ω VS = ±15V 1210 F05b an ESD protection device connected between the inputs. RL = 10Ω In normal operation, the differential voltage between the (b) AV = –1 input pins is small, so this clamp has no effect; however, in the shutdown mode the differential swing can be the same as the input swing. The clamp voltage will then set the maximum allowable input voltage. To allow for some margin, it is recommended that the input signal be less than ±5V when the device is shut down. Capacitance on the Inverting Input Current feedback amplifiers require resistive feedback from the output to the inverting input for stable operation. Take care to minimize the stray capacitance between the RF = RG = 750Ω VS = ±15V 1210 F05c output and the inverting input. Capacitance on the invert- RL = 10Ω ing input to ground will cause peaking in the frequency (c) A = 2 V response (and overshoot in the transient response), but Figure 5. Large-Signal Response it does not degrade the stability of the amplifier. Rev C 11 For more information www.analog.com

LT1210 APPLICATIONS INFORMATION Power Supplies For surface mount devices heat sinking is accomplished by using the heat spreading capabilities of the PC board The LT1210 will operate from single or split supplies and its copper traces. Experiments have shown that the from ±5V (10V total) to ±15V (30V total). It is not neces- heat spreading copper layer does not need to be electri- sary to use equal value split supplies, however the offset cally connected to the tab of the device. The PCB material voltage and inverting input bias current will change. The can be very effective at transmitting heat between the pad offset voltage changes about 500µV per volt of supply area attached to the tab of the device, and a ground or mismatch. The inverting bias current can change as much power plane layer either inside or on the opposite side of as 5µA per volt of supply mismatch, though typically the the board. Although the actual thermal resistance of the change is less than 0.5µA per volt. PCB material is high, the length/area ratio of the thermal resistance between the layer is small. Copper board stiff- Power Supply Bypassing eners and plated through holes can also be used to spread To obtain the maximum output and the minimum distor- the heat generated by the device. tion from the LT1210, the power supply rails should be Table 1 and Table 2 list thermal resistance for each pack- well bypassed. For example, with the output stage pour- age. For the TO-220 package, thermal resistance is given ing 1A current peaks into the load, a 1Ω power supply for junction-to-case only since this package is usually impedance will cause a droop of 1V, reducing the available mounted to a heat sink. Measured values of thermal resis- output swing by that amount. Surface mount tantalum tance for several different board sizes and copper areas and ceramic capacitors make excellent low ESR bypass are listed for each surface mount package. All measure- elements when placed close to the chip. For frequencies ments were taken in still air on 3/32" FR-4 board with 2 above 100kHz, use 1µF and 100nF ceramic capacitors. oz copper. This data can be used as a rough guideline in If significant power must be delivered below 100kHz, estimating thermal resistance. The thermal resistance for capacitive reactance becomes the limiting factor. Larger each application will be affected by thermal interactions ceramic or tantalum capacitors, such as 4.7µF, are recom- with other components as well as board size and shape. mended in place of the 1µF unit mentioned above. Inadequate bypassing is evidenced by reduced output Table 1. R Package, 7-Lead DD swing and “distorted” clipping effects when the output COPPER AREA THERMAL RESISTANCE is driven to the rails. If this is observed, check the supply TOPSIDE* BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT) pins of the device for ripple directly related to the output 2500 sq. mm 2500 sq. mm 2500 sq. mm 25°C/W waveform. Significant supply modulation indicates poor 1000 sq. mm 2500 sq. mm 2500 sq. mm 27°C/W bypassing. 125 sq. mm 2500 sq. mm 2500 sq. mm 35°C/W *Tab of device attached to topside copper Thermal Considerations Table 2. Fused 16-Lead SO Package The LT1210 contains a thermal shutdown feature which COPPER AREA THERMAL RESISTANCE protects against excessive internal (junction) tempera- TOPSIDE* BACKSIDE BOARD AREA (JUNCTION-TO-AMBIENT) ture. If the junction temperature of the device exceeds 2500 sq. mm 2500 sq. mm 5000 sq. mm 40°C/W the protection threshold, the device will begin cycling 1000 sq. mm 2500 sq. mm 3500 sq. mm 46°C/W between normal operation and an off state. The cycling 600 sq. mm 2500 sq. mm 3100 sq. mm 48°C/W is not harmful to the part. The thermal cycling occurs 180 sq. mm 2500 sq. mm 2680 sq. mm 49°C/W at a slow rate, typically 10ms to several seconds, which 180 sq. mm 1000 sq. mm 1180 sq. mm 56°C/W depends on the power dissipation and the thermal time constants of the package and heat sinking. Raising the 180 sq. mm 600 sq. mm 780 sq. mm 58°C/W ambient temperature until the device begins thermal shut- 180 sq. mm 300 sq. mm 480 sq. mm 59°C/W down gives a good indication of how much margin there 180 sq. mm 100 sq. mm 280 sq. mm 60°C/W is in the thermal design. 180 sq. mm 0 sq. mm 180 sq. mm 61°C/W Rev C 12 For more information www.analog.com

LT1210 APPLICATIONS INFORMATION T7 Package, 7-Lead TO-220 5V Thermal Resistance (Junction-to-Case) = 5°C/W A 76mA Calculating Junction Temperature The junction temperature can be calculated from the + equation: LT1210 VO 02VV SD –2V – TJ = (PD)(θJA) + TA 10Ω where: VO = 1.4VRMS T = Junction Temperature –5V J 220Ω 680Ω T = Ambient Temperature 1210 F07 A P = Device Dissipation D Figure 7. θ = Thermal Resistance (Junction-to-Ambient) JA then: As an example, calculate the junction temperature for the T = (0.56W)(46°C/W) + 70°C = 96°C circuit in Figure 7 for the SO and R packages assuming a J for the SO package with 1000 sq. mm topside 70°C ambient temperature. heat sinking The device dissipation can be found by measuring the T = (0.56W)(27°C/W) + 70°C = 85°C supply currents, calculating the total dissipation and J for the R package with 1000 sq. mm topside heat then subtracting the dissipation in the load and feed- sinking back network. P = (76mA)(10V) – (1.4V)2/ 10 = 0.56W Since the maximum junction temperature is 150°C, D both packages are clearly acceptable. Rev C 13 For more information www.analog.com

LT1210 TYPICAL APPLICATIONS Precision × 10 High Current Amplifier CMOS Logic to Shutdown Interface 15V VIN + LT1097 + + – LT121C0OMP OUT LT1210 24kΩ – SD – SD 0.01µF 500pF 5V –15V 330Ω 3kΩ 10kΩ 2N3904 9.09kΩ 1210 TA04 OUTPUT OFFSET: <500µV SLEW RATE: 2V/µs 1kΩ BANDWIDTH: 4MHz 1210 TA03 STABLE WITH CL < 10nF Distribution Amplifier Buffer A = 1 V VIN + 75Ω CABLE VIN + 75Ω LT1210 75Ω LT1210 COMP VOUT – SD – SD RF 75Ω 0.01µF* * OPTIONAL, USE WITH CAPACITIVE LOADS ** VALUE OF RF DEPENDS ON SUPPLY 75Ω VOLTAGE AND LOADING. SELECT RF** FROM TYPICAL AC PERFORMANCE TABLE OR DETERMINE EMPIRICALLY RG 1210 TA06 75Ω 1210 TA05 Rev C 14 For more information www.analog.com

LT1210 SIMPLIFIED SCHEMATIC V+ TO ALL CURRENT Q5 SOURCES Q10 Q2 D1 Q11 Q18 Q1 Q6 Q15 Q17 Q9 V– 1.25kΩ V– 50Ω +IN –IN CC RC COMP OUTPUT V+ SHUTDOWN V+ Q12 Q3 Q8 Q16 Q14 Q4 D2 Q13 Q7 V– 1210 SS Rev C 15 For more information www.analog.com

LT1210 PACKAGE DESCRIPTION Please refer to http://www.linear.com/product/LT1210#packaging for the most recent package drawings. R Package 7-LeRad P Paclaksatgice DD Pak (Refere7n-cLee LaTdC PDlWasGt i#c 0D5D-0 P8a-1k462 Rev G) (Reference LTC DWG # 05-08-1462 Rev G) 0.25 ±0.02 0.06 ±0.01 (6.350 ±0.508) (1.524 ±0.254) 0.390 – 0.415 0.06 ±0.01 TYP (9.906 – 10.541) 0.165 – 0.180 (1.524 ±0.254) (4.191 – 4.572) 0.045 – 0.055 (1.143 – 1.397) 15° ±5° 0.30 ±0.02 (7.620 ±0.508) (10.5.0264 ±±00..02154) (4.05.7128 ±± 00..02154) (08..333802 –– 09..337908) (130..95750 ±±01.0.2570) (10.5.0264T Y±±P00..02154) (00..100024+–+–0000....210000003284) 0.095 – 0.115 0.085 ±0.01 (2.413 – 2.921) (2.159 ±0.254) DETAIL A 0.050 0.050 ±0.012 0.30 ±0.02 0.143+0.012 (1.270) 0.013 – 0.023 (1.270 ±0.305) (7.620 ±0.508) ( +–00..300250) 0.026 – 0.035 BSC (0.330 – 0.584) BOTTOM VIEW OF DD PAK 3.632–0.508 (0.660 – 0.889) HATCHED AREA IS SOLDER PLATED TYP COPPER HEAT SINK DETAIL A 0° – 7° TYP 0° – 7° TYP 0.420 0.080 0.420 0.276 0.350 0.325 0.205 0.585 0.585 0.320 0.090 0.090 0.050 0.035 0.050 0.035 RECOMMENDED SOLDER PAD LAYOUT RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) R (DD7) 0416 REV G 2. DRAWING NOT TO SCALE Rev C 16 For more information www.analog.com

LT1210 PACKAGE DESCRIPTION Please refer to http://www.linear.com/product/LT1210#packaging for the most recent package drawings. S Package 16-Lead Plastic Small Outline (Narrow .150 Inch) S Package (Reference LTC DWG # 05-08-1610 Rev G) 16-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610 Rev G) .386 – .394 .045 ±.005 (9.804 – 10.008) .050 BSC NOTE 3 16 15 14 13 12 11 10 9 N N .245 MIN .160 ±.005 .150 – .157 .228 – .244 (3.810 – 3.988) (5.791 – 6.197) NOTE 3 1 2 3 N/2 N/2 .030 ±.005 TYP RECOMMENDED SOLDER PAD LAYOUT 1 2 3 4 5 6 7 8 .010 – .020 × 45° .053 – .069 (0.254 – 0.508) (1.346 – 1.752) .004 – .010 .008 – .010 (0.101 – 0.254) (0.203 – 0.254) 0° – 8° TYP .014 – .019 .050 .016 – .050 (0.355 – 0.483) (1.270) (0.406 – 1.270) TYP BSC S16 REV G 0212 NOTE: INCHES 1. DIMENSIONS IN (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) 4. PIN 1 CAN BE BEVEL EDGE OR A DIMPLE Rev C 17 For more information www.analog.com

LT1210 PACKAGE DESCRIPTION Please refer to http://www.linear.com/product/LT1210#packaging for the most recent package drawings. T7 Package 7-Lead TP7la Pstaicc kTaOg-e220 (Standard) 7-Lea(Rde Pfelraesntciec L TTCO -D2W2G0 #(S 0t5a-n08d-a1r4d2)2) (Reference LTC DWG # 05-08-1422) .147 – .155 .165 – .180 .390 – .415 (3.734 – 3.937) (4.191 – 4.572) .045 – .055 (9.906 – 10.541) DIA (1.143 – 1.397) .230 – .270 (5.842 – 6.858) .570 – .620 .620 .460 – .500 (14.478 – 15.748) (15.75) (11.684 – 12.700) .330 – .370 TYP .700 – .728 (8.382 – 9.398) (17.780 – 18.491) SEATING PLANE .095 – .115 (2.413 – 2.921) .152 – .202 .155 – .195* .260 – .320 (3.860 – 5.130) (3.937 – 4.953) (6.604 – 8.128) .050 .026 – .036 .013 – .023 BSC (1.27) (0.660 – 0.914) .135 – .165 (0.330 – 0.584) (3.429 – 4.191) *MEASURED AT THE SEATING PLANE T7 (TO-220) 0801 Rev C 18 For more information www.analog.com

LT1210 REVISION HISTORY (Revision history begins at Rev B) REV DATE DESCRIPTION PAGE NUMBER B 11/15 Added LT1210IR#PBF 1 to 3, 20 C 04/18 Added Ohmic symbols 1 to 20 Rev C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog 19 Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license Fiso gr rmanoterde biny fiomrpmlicaattiioonn owr wotwhe.arwniasleo ugn.cdeorm any patent or patent rights of Analog Devices.

LT1210 TYPICAL APPLICATION Wideband 9W Bridge Amplifier 15V I5NVPPU-TP + 9PWO Frequency Response LT1210 – SD 10nF T1* 5R0LΩ 26 23 1 9W 1 20 –15V 680Ω 17 100nF 1 B) 14 d N ( 11 220Ω GAI 8 1 5 15V 1 1 2 910Ω – –1 LT1210 –4 SD 10k 100k 1M 10M 100M + 10nF FREQUENCY (Hz) 1210 TA08 * COILTRONICS Versa-Pac™ CTX-01-13033-X2 –15V OR EQUIVALENT 1210 TA07 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1010 Fast ±150mA Power Buffer 20MHz Bandwidth, 75V/µs Slew Rate LT1166 Power Output Stage Automatic Bias System Sets Class AB Bias Currents for High Voltage/High Power Output Stages LT1206 Single 250mA, 60MHz Current Feedback Amplifier Shutdown Function, Stable with C = 10,000pF, 900V/µs L Slew Rate LT1207 Dual 250mA, 60MHz Current Feedback Amplifier Dual Version of LT1206 LT1227 Single 140MHz Current Feedback Amplifier Shutdown Function, 1100V/µs Slew Rate LT1360 Single 50MHz, 800V/µs Op Amp Voltage Feedback, Stable with C = 10,000pF L LT1363 Single 70MHz, 1000V/µs Op Amp Voltage Feedback, Stable with C = 10,000pF L LTC6090/ 140V Operational Amplifier 50pA I , 1.6mV V , 9.5V to 140V V , 4.5µA I RR Output B OS S S LTC6090-5 LTC6091 140V Operational Amplifier 50pA I , 1.6mV V , 9.5V to 140V V , 4.5µA I RR Output B OS S S Rev C 20 D16837-0-4/18(C) www.analog.com For more information www.analog.com  ANALOG DEVICES, INC. 1996-2018