LT1193 Video Difference n Amplifier FEATURES DESCRIPTIOU Differential or Single-Ended Gain Block (Adjustable) The LT®1193 is a video difference amplifier optimized for n –3dB Bandwidth, A = – 2: 80MHz operation on – 5V and a single 5V supply. This versatileamplifier features uncommitted high input impedance (+) V n Slew Rate: 500V/m s and (–) inputs, and can be used in differential or single- n Low Cost ended configurations. Additionally, a second set of inputs n Output Current: – 50mA give gain adjustment and DC control to the differential n Settling Time: 180ns to 0.1% amplifier. n CMRR at 10MHz: >40dB The LT1193’s high slew rate, 500V/m s, wide bandwidth, n Differential Gain Error: 0.2% 80MHz, and – 50mA output current make it ideal for n Differential Phase Error: 0.08(cid:176) driving cables directly. The shutdown feature reduces the n Single 5V Operation power dissipation to a mere 15mW and allows multiple n Drives Cables Directly amplifiers to drive the same cable. n Output Shutdown The LT1193 is available in 8-pin PDIP and SO packages. APPLICATIOU S , LTC and LT are registered trademarks of Linear Technology Corporation. n Line Receivers n Video Signal Processing n Cable Drivers n Oscillators n Tape and Disc Drive Systems TYPICAL APPLICATIOU Cable Sense Amplifier for Loop Through Connections with DC Adjust VIN 5V 3 + 7 CABLE 2 – 6 75Ω VDC 1 +LT1193 VOUT 8 – 4 75Ω –5V 300Ω LT1193 • TA01 300Ω 1193fb 1

LT1193 ABSOLUTE W AXIW UW RATIU GS PACKAGE/ORDER IU FORW ATIOU (Note 1) Total Supply Voltage (V+ to V–).............................. 18V ORDER PART Differential Input Voltage........................................ – 6V TOP VIEW NUMBER Input Voltage.......................................................... – V S +/REF 1 8 –/FB Output Short-Circuit Duration (Note 2).........Continuous –IN 2 7 V+ LT1193CN8 Operating Temperature Range LT1193CS8 +IN 3 6 OUT LT1193M (OBSOLETE)................–55(cid:176) C to 125(cid:176) C V– 4 5 SHDN LT1193IS8 LT1193C..................................................0(cid:176) C to 70(cid:176) C N8 PACKAGE S8 PACKAGE S8 PART MARKING LT1193I...............................................–40(cid:176) C to 85(cid:176) C 8-LEAD PDIP 8-LEAD PLASTIC SO Maximum Temperature ........................................150(cid:176) C TJMAX = 150(cid:176)C, q JA = 100(cid:176)C/W (N8) 1193 Storage Temperature Range.................–65(cid:176) C to 150(cid:176) C TJMAX = 150(cid:176)C, q JA = 150(cid:176)C/W (S8) 1193I Lead Temperature (Soldering, 10 sec)..................300(cid:176) C J8 PACKAGE 8-LEAD CERDIP LT1193MJ8 TJMAX = 150(cid:176)C, q JA = 100(cid:176)C/W LT1193CJ8 OBSOLETE PACKAGE Consider the N8 or S8 Packages for Alternate Source Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS V = – 5V, V = 0V, R = 900W from Pins 6 to 8, R = 100W from Pin 8 S REF FB1 FB2 to ground, R = R + R = 1k (Note 3), T = 25(cid:176) C, C £ 10pF, Pin 5 open circuit, unless otherwise noted. L FB1 FB2 A L LT1193M/C/I SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage Both Inputs (Note 4) All Packages 2 12 mV OS I Input Offset Current Either Input 0.2 3 m A OS I Input Bias Current Either Input – 0.5 – 3.5 m A B e Input Noise Voltage f = 10kHz 50 nV/(cid:214) Hz n O i Input Noise Current f = 10kHz 4 pA/(cid:214) Hz n O R Input Resistance Either Input 100 kW IN C Input Capacitance Either Input 2 pF IN V Input Voltage Limit (Note 5) 1.3 V IN(LIM) Input Voltage Range –2.5 3.5 V CMRR Common Mode Rejection Ratio V = –2.5V to 3.5V 60 75 dB CM PSRR Power Supply Rejection Ratio V = – 2.375V to – 8V 60 75 dB S V Output Voltage Swing V = – 5V, R = 1k – 3.8 – 4 V OUT S L V = – 8V, R = 1k – 6.8 – 7 V S L V = – 8V, R = 100W 6.4 6.6 V S L G Gain Error V = – 3V, R = 1k 0.1 1.0 % E O L R = 100W 0.1 1.2 % L SR Slew Rate V = – 2V, R = 300W (Notes 6, 11) 350 500 V/m s O L FPBW Full-Power Bandwidth V = 6V (Note 7) 18.5 26.5 MHz O P-P BW Small-Signal Bandwidth 9 MHz t, t Rise Time, Fall Time A = 50, V = – 1.5V, 20% to 80% (Note 11) 110 160 210 ns r f V O t Propagation Delay R = 1k, V = – 125mV, 50% to 50% 15 ns PD L O Overshoot V = – 50mV 0 % O t Settling Time 3V Step, 0.1% (Note 8) 180 ns s Diff A Differential Gain R = 150W , A = 2 (Note 9) 0.2 % V L V Diff Ph Differential Phase R = 150W , A = 2 (Note 9) 0.08 Deg L V P-P 1193fb 2

LT1193 ELECTRICAL CHARACTERISTICS V = – 5V, V = 0V, R = 900W from Pins 6 to 8, R = 100W from Pin 8 S REF FB1 FB2 to ground, R = R + R = 1k (Note 3), T = 25(cid:176) C, C £ 10pF, Pin 5 open circuit, unless otherwise noted. L FB1 FB2 A L LT1193M/C/I SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS I Supply Current 35 43 mA S Shutdown Supply Current Pin 5 at V– 1.3 2 mA I Shutdown Pin Current Pin 5 at V– 20 50 m A SHDN t Turn On Time Pin 5 from V– to Ground, R = 1k 300 ns ON L t Turn Off Time Pin 5 from Ground to V–, R = 1k 200 ns OFF L V + = 5V, V – = 0V, V = 2.5V, R = 900W from Pins 6 to 8, R = 100W from Pin 8 to V , R = R + R = 1k (Note 3), S S REF FB1 FB2 REF L FB1 FB2 T = 25(cid:176) C, C £ 10pF, Pin 5 open circuit, unless otherwise noted. A L LT1193M/C/I SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage Both Inputs (Note 4) All Packages 3 15 mV OS I Input Offset Current Either Input 0.2 3 m A OS I Input Bias Current Either Input – 0.5 – 3.5 m A B Input Voltage Range 2 3.5 V CMRR Common Mode Rejection Ratio V = 2V to 3.5V 55 70 dB CM V Output Voltage Swing R = 100 W to Ground V High 3.6 3.8 V OUT L OUT V Low 0.25 0.4 V OUT SR Slew Rate V = 1V to 3V 250 V/m s O BW Small-Signal Bandwidth 8 MHz I Supply Current 32 40 mA S Shutdown Supply Current Pin 5 at V– 1.3 2 mA I Shutdown Pin Current Pin 5 at V– 20 50 m A SHDN The l denotes the specificatons which apply over the full operating temperature range of –55(cid:176) C £ T £ 125(cid:176) C. V = – 5V, A S V = 0V, R = 900W from Pins 6 to 8, R = 100W from Pin 8 to ground, R = R = 1k (Note 3), C £ 10pF, Pin 5 open circuit, REF FB1 FB2 L FB2 L unless otherwise noted. LT1193M SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage l 2 16 mV OS D V /D T Input V Drift l 20 m V/(cid:176) C OS OS I Input Offset Current l 0.8 5 m A OS I Input Bias Current l – 1 – 5.5 m A B Input Voltage Range l –2.5 3.5 V CMRR Common Mode Rejection Ratio V = –2.5V to 3.5V l 53 70 dB CM PSRR Power Supply Rejection Ratio V = – 2.375V to – 5V l 53 70 dB S V Output Voltage Swing R = 1k l 3.6 4 V OUT L V = – 8V, R = 100W l 6 6.5 S L G Gain Error V = – 3V, R = 1k l 0.2 1.2 % E O L I Supply Current l 35 43 mA S Shutdown Supply Current Pin 5 at V– (Note 10) l 1.3 2.2 mA I Shutdown Pin Current Pin 5 at V– l 20 m A SHDN 1193fb 3

LT1193 ELECTRICAL CHARACTERISTICS The l denotes the specificatons which apply over the full operating temperature range of –40(cid:176) C £ T £ 85(cid:176) C. V = – 5V, A S V = 0V, R = 900W from Pins 6 to 8, R = 100W from Pin 8 to ground, R = R = 1k (Note 3), C £ 10pF, Pin 5 open circuit, REF FB1 FB2 L FB2 L unless otherwise noted. LT1193I SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage SO-8 Package l 2 20 mV OS D V /D T Input V Drift l 20 m V/(cid:176) C OS OS I Input Offset Current l 0.8 5 m A OS I Input Bias Current l – 1 – 5.5 m A B Input Voltage Range l –2.5 3.5 V CMRR Common Mode Rejection Ratio V = –2.5V to 3.5V l 53 70 dB CM PSRR Power Supply Rejection Ratio V = – 2.375V to – 5V l 53 70 dB S V Output Voltage Swing R = 1k l 3.6 4 V OUT L V = – 8V, R = 100W l 6 6.5 S L G Gain Error V = – 3V, R = 1k l 0.2 1.2 % E O L I Supply Current l 35 43 mA S Shutdown Supply Current Pin 5 at V– (Note 10) l 1.3 2.2 mA I Shutdown Pin Current Pin 5 at V– l 20 m A SHDN The l denotes the specificatons which apply over the full operating temperature range of 0(cid:176) C £ T £ 70(cid:176) C. V = – 5V, V = 0V, A S REF R = 900W from Pins 6 to 8, R = 100W from Pin 8 to ground, R = R + R = 1k (Note 3), C £ 10pF, Pin 5 open circuit, FB1 FB2 L FB1 FB2 L unless otherwise noted. LT1193C SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage N8 Package l 2 14 mV OS SO-8 Package l 20 mV D V /D T Input V Drift l 20 m V/(cid:176) C OS OS I Input Offset Current l 0.2 3.5 m A OS I Input Bias Current l – 0.5 – 4 m A B Input Voltage Range l –2.5 3.5 V CMRR Common Mode Rejection Ratio V = –2.5V to 3.5V l 55 70 dB CM PSRR Power Supply Rejection Ratio V = – 2.375V to – 5V l 55 70 dB S V Output Voltage Swing R = 1k l 3.7 4 V OUT L R = 100W l 6.2 6.6 V L G Gain Error V = – 3V, R = 1k l 0.2 1.2 % E O L I Supply Current l 35 43 mA S Shutdown Supply Current Pin 5 at V– (Note 10) l 1.3 2.1 mA I Shutdown Pin Current Pin 5 at V– l 20 m A SHDN Note 1: Absolute Maximum Ratings are those values beyond which the Note 7: Full-power bandwidth is calculated from the slew rate life of a device may be impaired. measurement: Note 2: A heat sink is required to keep the junction temperature below FPBW = SR/2p V . P absolute maximum when the output is shorted. Note 8: Settling time measurement techniques are shown in “Take the Note 3: When R = 1k is specified, the load resistor is R + R , but Guesswork Out of Settling Time Measurements,” EDN, September 19, L FB1 FB2 when R = 100W is specified, then an additional 100W is added to the 1985. L output. Note 9: NTSC (3.58MHz). Note 4: VOS measured at the output (Pin 6) is the contribution from both Note 10: See Applications section for shutdown at elevated temperatures. input pair, and is input referred. Do not operate the shutdown above T > 125(cid:176) C. J Note 5: VIN LIM is the maximum voltage between –VIN and +VIN (Pin 2 and Note 11: AC parameters are 100% tested on the ceramic and plastic DIP Pin 3) for which the output can respond. packaged parts (J and N suffix) and are sample tested on every lot of the Note 6: Slew rate is measured between – 2V on the output, with a – 1V SO packaged parts (S suffix). input step, A = 3. V 1193fb 4

LT1193 TYPICAL PERFORW AU CE CHARACTERISTICS Input Bias Current Input Bias Current Common Mode Voltage vs Common Mode Voltage vs Temperature vs Supply Voltage 4 –0.3 10 VS = – 5V VS = – 5V –55°C 8 25°C 3 µT (A) 2 µT (A)–0.4 +IB AGE (V) 46 +V COMMON MODE 125°C CURREN 1 CURREN–0.5 IOS DE VOLT 02 INPUT BIAS –10 –55°C 25°C 125°C INPUT BIAS ––00..76 –IB COMMON MO –––624 –V COMMON MODE –1225555°°°CCC –8 –2 –0.8 –10 –4 –3 –2 –1 0 1 2 3 4 –50 –25 0 25 50 75 100 125 0 2 4 6 8 10 COMMON MODE VOLTAGE (V) TEMPERATURE (°C) – V SUPPLY VOLTAGE (V) LT1193 • TPC01 LT1193 • TPC02 LT1193 • TPC03 Equivalent Input Noise Voltage Equivalent Input Noise Current vs Frequency vs Frequency Supply Current vs Supply Voltage √NT INPUT NOISE VOLTAGE (nV/Hz) 334221105050500000000 VRTASS === 2–05Ω5°VC √NT INPUT NOISE CURRENT (pA/Hz) 26840000 VRTASS === 2–1505°0VCk SUPPLY CURRENT (mA) 23450000 12255°°CC–55°C UIVALE 50 UIVALE 10 Q Q E 0 E 0 0 10 100 1k 10k 100k 10 100 1k 10k 100k 0 2 4 6 8 10 FREQUENCY (Hz) FREQUENCY (Hz) – SUPPLY VOLTAGE (V) LT1193 • TPC04 LT1193 • TPC05 LT1193 • TPC06 Shutdown Supply Current vs Temperature Gain Error vs Temperature Open-Loop Gain vs Temperature 5.0 3 20k VS = – 5V VS = – 5V VS = – 5V A) 4.5 VO = – 3V CURRENT (m 43..05 VSHDN = –VEE + 0.4V R (%) 12 RL = 100Ω AIN (V/V) 15k RL = 1k WN SUPPLY 23..50 VSHDN = –VEE + 0.2V GAIN ERRO 0 RL = 1k PEN-LOOP G 10k DO 2.0 O 5k SHUT 1.5 VSHDN = –VEE –1 RL = 100W 1.0 –2 0 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 –50 –25 0 25 50 75 100 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) LT1193 • TPC07 LT1193 • TPC08 LT1193 • TPC09 1193fb 5

LT1193 TYPICAL PERFORW AU CE CHARACTERISTICS Open-Loop Voltage Gain Gain Bandwidth Product Gain, Phase vs Frequency vs Load Resistance vs Supply Voltage 100 100 20k 80 VS = – 5V 80 PHASE 80 P V/V) TVAO == 2–53°VC MHz) VOLTAGE GAIN (dB) 2640000 VS = – 5V GAIN 0264000 HASE MARGIN (DEGREES) OPEN-LOOP VOLTAGE GAIN ( 11505kkk AIN BANDWIDTH PRODUCT ( 6700 TA = –55°C, 25°C, 125°C TA = 25°C G –20 RL = 1k –20 0 50 100k 1M 10M 100M 10 100 1000 0 2 4 6 8 10 FREQUENCY (Hz) LOAD RESISTANCE (W ) – SUPPLY VOLTAGE (V) LT1193 • TPC11 LT1193 • TPC10 LT1193 • TPC12 Gain Bandwidth Product and Unity Common Mode Rejection Ratio Gain Phase Margin vs Temperature Output Impedance vs Frequency vs Frequency GAIN BANDWIDTH PRODUCT (MHz) 3455676455055000 GAIN BANDWIDTH PRODPUHUCANTSIET YM GAVRARSILGN ==IN –1k5V 3455676455055000 PHASE MARGIN (DEGREES) WOUTPUT IMPEDANCE ( )01.0010.11100 VTAS == 2– 55°VC AV = 10 AV = 2 OMMON MODE REJECTION RATIO (dB) 5678400000 VTRASL === 2–15k5°VC C 30 30 0.001 30 –50 –25 0 25 50 75 100 125 1k 10k 100k 1M 10M 100M 100k 1M 10M 100M TEMPERATURE (°C) FREQUENCY (Hz) FREQUENCY (Hz) LT1193 • TPC13 LT1193 • TPC14 LT1193 • TPC15 Power Supply Rejection Ratio Output Short-Circuit Current vs Frequency vs Temperature Output Swing vs Supply Voltage 80 100 10 UPPLY REJECTION RATIO (dB) 246000 –+PPSSRRRR VTVASR I==P P2–L55E (cid:176)V =C – 300mV HORT-CIRCUIT CURRENT (mA) 8900 VS = – 5V OUTPUT SWING (V) ––2402468 RL = 1k 1+2V5O°CU,T ,– 2555°°CC, –VOUT, –55°C, S S 25°C, 125°C WER 0 PUT –6 PO OUT –8 –20 70 –10 1k 10k 100k 1M 10M 100M –50 –25 0 25 50 75 100 125 0 2 4 6 8 10 FREQUENCY (Hz) TEMPERATURE (°C) – V SUPPLY VOLTAGE (V) LT1193 • TPC16 LT1193 • TPC17 LT1193 • TPC18 1193fb 6

LT1193 TYPICAL PERFORW AU CE CHARACTERISTICS Output Voltage Swing Output Voltage Step vs Load Resistance Slew Rate vs Temperature vs Settling Time, A = 2 V 5 900 4 VS = – 5V VS = – 5V TA = 25°C UT VOLTAGE SWING (V) –311 TA = –55(cid:176)C TA = 1TA2 5=(cid:176) C25(cid:176)C µSLEW RATE (V/s)578600000000 –SLEW+ SRLAETWE RATE PUT VOLTAGE STEP (V) 02 RL = 1k 10mV OUTP –3 TA = 125(cid:176)C 400 VTAS == 2– 55°VC OUT –2 10mV TA = –55(cid:176)C, 25(cid:176)C RVOL == 1– k2V –5 300 –4 10 100 1000 –50 –25 0 25 50 75 100 125 40 50 60 70 80 90 100 LOAD RESISTANCE (W ) TEMPERATURE (°C) SETTLING TIME (ns) LT1193 • TPC19 LT1193 • TPC20 LT1193 • TPC21 Large-Signal Transient Response Small-Signal Transient Response Small-Signal Transient Response LT1193 • TPC22 LT1193 • TPC23 LT1193 • TPC24 AV = 2, RL = 150W , RFB = 300W , RG = 300W AV = –10, SMALL-SIGNAL RISE TIME = 43ns AV = 2, RFB = 300W , RG = 300W , OVERSHOOT = 25%, RISE TIME = 4.7ns APPLICATIOU S IU FORW ATIOU The LT1193 is a video difference amplifier which has two and a full-power bandwidth of 40MHz at 4V . Like the P-P uncommitted high input impedance (+) and (–) inputs. single-ended case, the differential voltage gain is set by the The amplifier has one set of inputs that can be used for external resistors: (R + R )/R . The maximum input FB G G reference and feedback. Additionally, this set of inputs differential signal for which the output will respond is give gain adjust and DC control to the differential amplifier. approximately – 1.3V. The voltage gain of the LT1193 is set like a conventional Power Supply Bypassing operational amplifier. Feedback is applied to Pin 8 and it is optimized for gains of 2 or greater. The amplifier can be The LT1193 is quite tolerant of power supply bypassing. operated single-ended by connecting either the (+) or (–) In some applications a 0.1m F ceramic disc capacitor inputs to +/REF, Pin 1. The voltage gain is set by the placed 1/2 inch from the amplifier is all that is required. A resistors: (R + R )/R . FB G G scope photo of the amplifier output with no supply by- The primary usefulness of the LT1193 is in converting passing is used to demonstrate this bypassing tolerance, high speed differential signals to a single-ended output. RL = 1k. The amplifier has common mode rejection beyond 50MHz 1193fb 7

LT1193 APPLICATIOU S IU FORW ATIOU SHDN SHDN Settling Time Poor Bypass V+ V+ 5 5 VIN 3 + 7 3 + 7 2 2 1 –+/RLETF1193 6 VOUT VIN 1 –+/RLTE1F193 6 VOUT 8 8 –/FB 4 –/FB 4 V– V– RFB RFB VOUT 0V 0VVOUT 1V/DIV 10mV/DIV RG AV = +RFBR +G RG RG AV = –RFBR +G RG SHDN SHDN V+ V+ 5 5 3 + 7 3 + 7 LT1192 • TA05 VINDIFF 2 – 6 VINDIFF 2 – 6 SETTLING TIME TO 10mV, AV = 2 VIN 18 +/RLTE1F193 VOUT RG 18 +/LRTE1F193 VOUT SUPPLY BYPASS CAPACITORS = 0.1m F –/FB 4 VIN –/FB 4 Settling Time Good Bypass V– V– RFB RFB RGVO = (VINDIFF + VIN)RFBR +G RG VO =(RFBR +G RG(VINDIFF –(RRFGB(VIN LT1193 • TA03 No Supply Bypass Capacitors VOUT 0V 0V VOUT 1V/DIV 10mV/DIV LT1192 • TA06 SETTLING TIME TO 10mV, AV = 2 SUPPLY BYPASS CAPACITORS = 0.1m F + 4.7m F TANTALUM Operating With Low Closed-Loop Gains The LT1193 has been optimized for closed-loop gains of 2 or greater; the frequency response illustrates the ob- LT1192 • TA04 tainable closed-loop bandwidths. For a closed-loop gain AV = 10, IN DEMO BOARD, RL = 1k of 2 the response peaks about 2dB. Peaking can be In many applications and those requiring good settling minimized by keeping the feedback elements below 1kW , time it is important to use multiple bypass capacitors. A and can be eliminated by placing a capacitor across the 0.1m F ceramic disc in parallel with a 4.7m F tantalum is feedback resistor, (feedback zero). This peaking shows recommended. Two oscilloscope photos with different up as time domain overshoot of about 40%. With the bypass conditions are used to illustrate the settling time feedback capacitor it is eliminated. characteristics of the amplifier. Note that although the Cable Terminations output waveform looks acceptable at 1V/DIV, when ampli- fied to 10mV/DIV the settling time to 10mV is 347ns for the The LT1193 video difference amplifier has been optimized 0.1m F bypass; the time drops to 96ns with multiple bypass as a low cost cable driver. The – 50mA guaranteed output capacitors. current enables the LT1193 to easily deliver 7.5V into P-P 1193fb 8

LT1193 APPLICATIOU S IU FORW ATIOU Closed-Loop Voltage Gain vs Frequency Small-Signal Transient Response 25 VS = – 5V B) AV = 10 TA = 25°C d N ( GAI 15 AV = 5 E G A LT AV = 3 O V OP AV = 2 LO 5 D- E S O L C –5 100k 1M 10M 100M LT1193 • TA10 FREQUENCY (Hz) AV = 2 WITH 8pF FEEDBACK CAPACITOR LT1193 • TA07 RISE TIME = 3.75ns, RFB = 1k, RG = 1k Closed-Loop Voltage Gain vs Frequency Double Terminated Cable Driver 10 E GAIN (dB) 8 RVTARASVFGB ==== = 2–23 35050°0VC0ΩΩ CFB =C 5FBp F= 0pF 8123 –+–+LT151V9743 6 75W CABLE75W AG 6 –5V OLT CFB = 10pF RG RFB V OP 4 CFB = 15pF CFB O L D- E OS 2 Closed-Loop Voltage Gain vs Frequency L C 8 0 100k 1M 10M 100M FREQUENCY (Hz) dB) 6 LT1193 • TA08 AIN ( 4 RFBA V= =3 020Ω E G RG = 100Ω Small-Signal Transient Response AG 2 CFB = 0pF T L O P V 0 ED LOO –2 RRFGBA =V= 3=30 0100ΩΩ OS CFB = 10pF CL –4 –6 100k 1M 10M 100M FREQUENCY (Hz) LT1193 • TA11 When driving a cable it is important to terminate the cable to avoid unwanted reflections. This can be done in one of two ways: single termination or double termination. With LT1193 • TA09 single termination, the cable must be terminated at the AV = 2, OVERSHOOT = 40%, RFB = 1k, RG = 1k receiving end (75W to ground) to absorb unwanted en- 100W , while operating on – 5V supplies and gains >3. On ergy. The best performance can be obtained by double a single 5V supply, the LT1193 can swing 2.6V for termination (75W in series with the output of the amplifier, P-P gains ‡ 2. and 75W to ground at the other end of the cable). This 1193fb 9

LT1193 APPLICATIOU S IU FORW ATIOU termination is preferred because reflected energy is ab- isolating the capacitance with 10W can be helpful. Precau- sorbed at each end of the cable. When using the double tions primarily have to do with driving large termination technique it is important to note that the signal capacitive loads. is attenuated by a factor of 2, or 6dB. The cable driver has Other precautions include: a –3dB bandwidth of 80MHz while driving a 150W load. 1. Use a ground plane (see Design Note 50, High Fre- Using the Shutdown Feature quency Amplifier Evaluation Board). The LT1193 has a unique feature that allows the amplifier 2. Do not use high source impedances. The input capaci- to be shut down for conserving power or for multiplexing tance of 2pF, and R = 10k for instance, will give an S several amplifiers onto a common cable. The amplifier will 8MHz –3dB bandwidth. shut down by taking Pin 5 to V–. In shutdown, the amplifier 3. PC board socket may reduce stability. dissipates 15mW while maintaining a true high impedance output state of 15kW in parallel with the feedback resis- 4. A feedback resistor of 1k or lower reduces the effects of tors. The amplifiers may be connected inverting, nonin- stray capacitance at the inverting input. (For instance, verting or differential for MUX applications. When the closed-loop gain of – 2 can use R = 300W and FB output is loaded with as little as 1kW from the amplifier’s R = 300W .) G feedback resistors, the amplifier shuts off in 200ns. This shutoff can be under the control of HC CMOS operating Driving Capacitive Load between 0V and –5V. Output Shutdown tON = 300ns tOFF = 200ns LT1193 • TA14 AV = 2, IN DEMO BOARD, CL = 30pF, RFB = 1k, RG = 1k LT1193 • TA12 Driving Capacitive Load 1MHz SINE WAVE GATED OFF WITH SHUTDOWN PIN, AV = 3, RFB = 1k, RG = 500W The ability to maintain shutoff is shown on the curve Shutdown Supply Current vs Temperature in the Typical Performance Characteristics section. At very high el- evated temperatures it is important to hold the SHDN pin close to the negative supply to keep the supply current from increasing. Murphy Circuits There are several precautions the user should take when using the LT1193 in order to realize its full capability. LT1193 • TA15 Although the LT1193 can drive a 30pF in gains as low as␣2, AWV I=T H2, 1IN0W D EISMOOL ABTOIANRGD R, ECSL I=S T3O0RpF 1193fb 10

LT1193 APPLICATIOU S IU FORW ATIOU Murphy Circuits 5V 5V 32 +– 7 6 COAX 23 +– 7 6 32 +– 5V7 18 +–LT11943 18 +–LT11943 18 +LT1193 6 1X SCOPE – 4 –5V –5V PROBE –5V SCOPE PROBE LT1193 • TA13 An Unterminated Cable Is A 1X Scope Probe Is a A Scope Probe on the Inverting a Large Capacitive Load Large Capacitive Load Input Reduces Phase Margin SIW PLIFIED SCHEW ATIC 7 V+ VBIAS VBIAS + 3 CM CFF – 2 +V +V 6 VOUT * 5 4 V– SHDN 1 +/REF 8 –/FB * SUBSTRATE DIODE, DO NOT FORWARD BIAS LT1193 • TA16 1193fb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. 11 However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

LT1193 PACKAGE DESCRIPTIOU J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) .405 (10.287) .300 BSC CORNER LEADS OPTION (5.2.00800) (0.0.10257) MAX (7.62 BSC) (4 PLCS) MAX MIN 8 7 6 5 .015 – .060 (0..508243 –– 1.0.14453) (0.381 – 1.524) .025 .220 – .310 HALF LEAD (0.635) (5.588 – 7.874) (0..200038 –– 0.0.41587) 0° – 15° .045 – .068 OPTION RAD TYP (1.143 – 1.650) 1 2 3 4 J8 0801 FULL LEAD .045 – .065 OPTION .125 (1.143 – 1.651) NOTE: LEAD DIMENSIONS APPLY TO SOLDER DIP/PLATE 3.175 OR TIN PLATE LEADS .014 – .026 .100 MIN OBSOLETE PACKAGE (0.360 – 0.660) (2.54) BSC N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) .300 – .325 .045 – .065 .130 – .005 MAX (7.620 – 8.255) (1.143 – 1.651) (3.302 – 0.127) 8 7 6 5 .065 .255 – .015* (1.651) .008 – .015 TYP (6.477 – 0.381) (0.203 – 0.381) .120 (3.048) .020 (.325+–..003155) .100 .018 – .0M0I3N (0M.5I0N8) 1 2 3 4 8.255–+00..838891 (2.54) (0.457 – 0.076) N8 1002 BSC NOTE: INCHES 1. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm) S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 (0..021504 –– .00.25008)· 45(cid:176) .053 – .069 .004 – .010 8 7 6 5 .050 BSC .045 – .005 (1.346 – 1.752) (0.101 – 0.254) .008 – .010 (0.203 – 0.254) 0°– 8° TYP .150 – .157 (0..041066 –– .10.52070) .014 – .019 .050 (5..272981 –– .62.41497) (3.81N0O T–E 3 3.988) .M24IN5 .160 – .005 (0.355 – 0.483) (1.270) NOTE: INCHES TYP BSC 1. DIMENSIONS IN (MILLIMETERS) 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. 1 2 3 4 .030 – .005 SO8 0303 MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) TYP RECOMMENDED SOLDER PAD LAYOUT RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1194 Video Difference Amp A = 10 Version of the LT1193 V 1193fb 12 Linear Technology Corporation LT/TP 0903 1K REV B • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 l FAX: (408) 434-0507 l www.linear.com ª LINEAR TECHNOLOGY CORPORATION 1991