DATA SHEET SKY12345-362LF: 0.7-4.0 GHz Five-Bit Digital Attenuator with Serial-to-Parallel Driver (0.5 dB LSB) Applications • Base stations • Wireless and RF data • Wireless local loop gain control circuits Features • Broadband operation: 0.7 to 4.0 GHz • Attenuation: 15.5 dB • LSB attenuation: 0.5 dB • Low insertion loss: 1 dB @ 900 MHz • Positive voltage operation: 5 V • Integrated silicon serial-to-parallel driver • Small, QFN (24-pin, 4 x 4 mm) package (MSL1, 260 °C per JEDEC J-STD-020) Figure 1. SKY12345-362LF Block Diagram Description The SKY12345-362LF is a GaAs FET five-bit digital attenuator I/C with a serial-to-parallel driver. The device is provided in a 4 x 4 mm, 24-pin Quad Flat No-Lead (QFN) package. The SKY12345-362LF is particularly suited for applications in which high attenuation accuracy, low insertion loss, and low intermodulation products are required. A functional block diagram is shown in Figure 1. The pin configuration and package are shown in Figure 2. Signal pin assignments and functional pin descriptions are provided in Table 1. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201136C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 11, 2011 1

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Figure 2. SKY12345-362LF Pinout – 24-Pin QFN (Top View) Table 1. SKY12345-362LF Signal Descriptions Pin # Name Description Pin # Name Description 1 GND or N/C Ground or no connection 13 GND or N/C Ground or no connection 2 RF1 RF input/output. Must be DC blocked. 14 VCC Fixed bias for SPI 3 GND or N/C Ground or no connection 15 GND or N/C Ground or no connection 4 GND or N/C Ground or no connection 16 GND or N/C Ground or no connection 5 SERIAL_OUTPUT Data output delayed by eight clock cycles 17 RF2 RF input/output. Must be DC blocked. 6 GND or N/C Ground or no connection 18 GND or N/C Ground or no connection 7 RESET Reset. Clears shift registers. 19 GND Ground 8 CLOCK Serial clock input 20 GND Ground 9 LATCH_ENABLE On rising edge of pulse, shifts five most 21 GND Ground recent clocked-in bits to set attenuation state 10 GND or N/C Ground or no connection 22 GND Ground 11 SERIAL_INPUT Data input 23 GND Ground 12 GND or N/C Ground or no connection 24 GND Ground Note: Exposed pad must be grounded. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 2 January 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201136C

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Functional Description Refer to the timing diagram in Figure 3 and timing parameter specifications in Table 2. Table 3 shows the transition states The SKY12345-362LF is a five bit digital attenuator comprised of based on the latch enable, clock, and reset logic settings. a GaAs attenuator and a silicon CMOS driver. The attenuation setting is controlled by a serial-to-parallel interface. Attenuation is Power-up sequence is as follows: set by a stream of data that is clocked into the shift registers of 0. Connect ground the silicon chip by the clock signal. To set the attenuation state, a latch signal is sent to the appropriate pin to send the correct bias 1. Apply VCC voltages to the GaAs attenuator. 2. Set all inputs (SCK, SDA, LE) More than one attenuator can be cascaded together and the data The power-down sequence is the reverse of above. may be passed through one device to the other using the Figure 4 shows an example of how to set the attenuator to the SERIAL_OUTPUT signal (pin 5). To reset the attenuator to the 0.5 dB state. The progression of the bit states vs the clock signal insertion loss state, a logic low signal may be sent to the RESET is shown. The timing diagram shows that when the latch enable pin. DC bias voltage to the silicon CMOS chip is applied to pin 14 signal goes high, the voltages v1 to v5 set the attenuator to the (VCC). 0.5 dB state. Power-Up/Power-Down Timing Electrical and Mechanical Specifications Serial input data (SERIAL_INPUT pin) is shifted into the register on the rising edge of the clock (CLOCK pin), least significant bit (LSB) The absolute maximum ratings of the SKY12345-362LF are first. The attenuator changes states on the rising edge of the provided in Table 4. Electrical specifications are provided in latch-enable (LATCH_ENABLE pin) signal, according to the most Tables 5 and 6. recent five bits of shifted data accepted since the previous falling Typical performance characteristics of the SKY12345-362LF are edge of the latch enable signal. The serial data output is the serial illustrated in Figures 5 through 11. input data delayed by eight clock cycldes. The state of the SKY12345-362LF is determined by the logic provided in Table 7. Figure 3. Power-Up/Power-Down Timing Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201136C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 11, 2011 3

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Table 2. Power-Up/Power-Down Timing Parameters VCC = 5 V VCC = 3 V Parameter Symbol Units Minimum Typical Maximum Minimum Typical Maximum Serial input setup time ts 5 5 ns Hold time from serial input to shift clock th 5 5 ns Setup time from shift clock to latch enable tlsup 40 100 ns Propagation delay, latch enable to C0.5 tpd 30 70 ns through C8 Setup time from reset to shift clock – 20 50 ns Clock frequency fCLK 30 10 MHz Table 3. Transition State Logic LATCH_ENABLE (Pin 9) CLOCK (Pin 8) RESET (Pin 7) Function X X L Shift register cleared X H Shift register clocked X H Contents of shift register transferred to digital attenuator Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 4 January 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201136C

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Figure 4. Example for Setting 0.5 dB State Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201136C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 11, 2011 5

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Table 4. SKY12345-362LF Absolute Maximum Ratings Parameter Symbol Minimum Typical Maximum Units RF input power @ 5 V PIN +30 dBm Supply voltage VCC 6 V Control voltage VCTL –0.2 +8 V Operating temperature TOP –40 +85 °C Storage temperature TSTG –65 +150 °C Note: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other parameters set at or below their nominal value. Exceeding any of the limits listed here may result in permanent damage to the device. CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times. Table 5. SKY12345-362LF Electrical Specifications (1 of 2) (Note 1) (VCC = 3 to 5 V, VCTL = 0 to 3 V and 5 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units Insertion loss 0.7 to 1.4 GHz 1.2 1.5 dB 1.4 to 2.3 GHz 1.3 2.0 dB 2.3 to 2.7 GHz 1.8 2.3 dB 2.7 to 4.0 GHz 2.0 2.7 dB Attenuation range 15.5 dB Attenuation accuracy Attenuation referred to insertion loss, all attenuation states 0.7 to 0.9 GHz ±(0.5 + 5% of attenuation setting max) dB 0.9 to 2.2 GHz ±(0.3 + 4% of attenuation setting max) dB 2.2 to 4.0 GHz ±(0.5 + 5% of attenuation setting max) dB Return loss RF1 and RF2 pins, all attenuation states 0.7 to 1.4 GHz 12 14 dB 1.4 to 2.3 GHz 15 18 dB 2.3 to 2.7 GHz 12 15 dB 2.7 to 4.0 GHz 10 13 dB Switching characteristics: On/rise time 50% VCTL to 90% RF or 1200 ns 10/90% RF Off/fall time 50% VCTL to 10% RF or 500 ns 90/10% RF Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 6 January 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201136C

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Table 5. SKY12345-362LF Electrical Specifications (2 of 2) (Note 1) (VCC = 3 to 5 V, VCTL = 0 to 3 V and 5 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units Input power for 0.1 dB compression 0.7 to 3.8 GHz VCC = VCTL = 5 V +25 dBm VCC = VCTL = 3 V +23 dBm Input power for 1 dB compression 0.7 to 3.8 GHz VCC = VCTL = 5 V +32 dBm VCC = VCTL = 3 V +30 dBm 3rd Order Input Intercept Point IIP3 0.7 to 3.8 GHz, for two- tone input power. 0 dBm/tone, 1 MHz spacing VCC = VCTL = 5 V +42 dBm VCC = VCTL = 3 V +42 dBm Note 1: Performance is guaranteed only under the conditions listed in this Table. Table 6. DC Electrical Characteristics (Note 1) (VCC = 3 to 5 V, VCTL = 0 to 3 V and 5 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units Input voltage, high VIH VCC = 3 V 2.3 3.0 V VCC = 5 V 3.5 5.0 V Input voltage, low VIL VCC = 3 V 0 1.0 V VCC = 5 V 0 1.5 V Input leakage current IL 0.5 μA Quiescent current ICC 500 μA Supply voltage VCC 3.0 5.0 5.5 V Note 1: Performance is guaranteed only under the conditions listed in this Table. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201136C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 11, 2011 7

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Typical Performance Characteristics (VCC = 5 V, VCTL = 0 to 5 V, TOP = +25 °C, PIN = 0 dBm, CBLK = 47 pF, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted) Figure 5. Insertion Loss vs Frequency Figure 6. Return Loss: Major States Figure 7. Normalized Attenuation: Major States Figure 8. Attenuation Bit Error vs Attenuation State Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 8 January 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201136C

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Figure 9. Attenuation Bit Error: Major States Figure 10. Relative Phase: Major States Figure 11. Worst Case Attenuation Step Error Between Successive Attenuation States Table 7. SKY12345-362LF Truth Table RF1/RF2 (Pins 2 & 17) RESET Serial Data Input Attenuation (Pin 7) 0.5 dB 1.0 dB 2.0 dB 4.0 dB 8.0 dB Insertion loss 1 1 1 1 1 1 0.5 dB 1 0 1 1 1 1 1.0 dB 1 1 0 1 1 1 2.0 dB 1 1 1 0 1 1 4.0 dB 1 1 1 1 0 1 8.0 dB 1 1 1 1 1 0 15.5 dB 1 0 0 0 0 0 Insertion loss 0 X X X X X Note: For VCC = 5 V: “1” = VIH = +3.5 V to +5 V. “0” = VIL = 0 to +0.5 V. For VCC = 3 V: “1” = VIH = +2.3 V to +3 V. “0” = VIL = 0 to +0.5 V. “X” = don’t care. This Table shows the logic required for the major bits and full attenuation. Bit states need to be used in combination to set the sum of the bits selected. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201136C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 11, 2011 9

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Evaluation Board Description Package and Handling Information The SKY12345-362LF Evaluation Board is used to test the Instructions on the shipping container label regarding exposure to performance of the SKY12345-362LF digital attenuator. An moisture after the container seal is broken must be followed. assembly drawing for the Evaluation Board is shown in Figure 12 Otherwise, problems related to moisture absorption may occur and an Evaluation Board schematic diagram is shown in when the part is subjected to high temperature during solder Figure 13. assembly. THE SKY12345-362LF is rated to Moisture Sensitivity Level 1 (MSL1) at 260 °C. It can be used for lead or lead-free soldering. Package Dimensions For additional information, refer to the Skyworks Application Note, The PCB layout footprint for the SKY12345-362LF is shown in Solder Reflow Information, document number 200164. Figure 14. Typical case markings are noted in Figure 15. Package Care must be taken when attaching this product, whether it is dimensions for the 24-pin QFN are shown in Figure 16, and tape done manually or in a production solder reflow environment. and reel dimensions are provided in Figure 17. Production quantities of this product are shipped in a standard tape and reel format. For packaging details, refer to the Skyworks Application Note, Discrete Devices and IC Switch/Attenuators Tape and Reel Package Orientation, document number 200083. Figure 12. SKY12345-362LF Evaluation Board Assembly Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 10 January 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201136C

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Figure 13. SKY12345-362LF Evaluation Board Schematic Diagram Figure 14. SKY12345-362LF PCB Layout Footprint Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201136C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 11, 2011 11

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Figure 15. Typical Part Markings Figure 16. SKY12345-362LF 24-Pin QFN Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 12 January 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201136C

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Figure 17. SKY12345-362LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 201136C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 11, 2011 13

DATA SHEET • SKY12345-362LF FIVE-BIT DIGITAL ATTENUATOR Ordering Information Model Name Manufacturing Part Number Evaluation Board Part Number SKY12345-362LF Digital Attenuator SKY12345-362LF SKY12345-362LF-EVB Copyright © 2009, 2011 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from any future changes. No license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document. Skyworks assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of Skyworks products, information or materials, except as may be provided in Skyworks Terms and Conditions of Sale. THE MATERIALS, PRODUCTS AND INFORMATION ARE PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, INCLUDING FITNESS FOR A PARTICULAR PURPOSE OR USE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY INTELLECTUAL PROPERTY RIGHT; ALL SUCH WARRANTIES ARE HEREBY EXPRESSLY DISCLAIMED. SKYWORKS DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING BUT NOT LIMITED TO ANY SPECIAL, INDIRECT, INCIDENTAL, STATUTORY, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THE MATERIALS OR INFORMATION, WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the Skyworks products could lead to personal injury, death, physical or environmental damage. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifications as a result of design defects, errors, or operation of products outside of published parameters or design specifications. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifications or parameters. Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for identification purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com 14 January 11, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201136C

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