DATA SHEET SKY12322-86LF: 0.5-4.0 GHz Five-Bit Digital Attenuator (0.5 dB LSB) Applications • Transceiver transmit automatic level control or receive automatic gain control in GSM, CDMA, WCDMA, WLAN, Bluetooth®, or Zigbee® land mobile radio base stations or terminal equipment • General-purpose signal attenuation in telecommunications and instrumentation applications Features • Broadband operation: 0.5 to 4.0 GHz • Positive voltage operation: 2.7 to 5.5 V • Low current consumption: <100 μA @ 3 V • LSB attenuation: 0.5 dB • Attenuation range: 15.5 dB • High IIP3: +45 dBm • Low insertion loss: 1.2 dB @ 900 MHz • Small, MSOP-10 (10-pin, 3 x 3 mm) package (MSL1, 260 °C per JEDEC J-STD-020) Figure 1. SKY12322-86LF Block Diagram The SKY12322-86LF is comprised of five cascaded fixed attenuators, each of which has a shunt bypass switch. Beginning at the 0.5 dB LSB, each succeeding fixed attenuator produces twice the attenuation of the preceding stage. Description The SKY12322-86LF is a monolithic, GaAs binary-weighted fivebit single positive control voltage digital attenuator. The device operates from 0.5 to 4.0 GHz. DC power consumption is very low, typically 100 μA maximum, with a control and supply voltage of 3 V. The state of each bypass switch is controlled by the logic level voltage applied to the associated control voltage input. A logic high voltage closes the associated switch, which bypasses that fixed attenuator stage; a logic low opens the switch to force the input signal to that stage through the associated attenuator. 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. The SKY12322-86LF has an LSB of 0.5 dB and total attenuation of 15.5 dB. The two RF ports are bilateral; each can be used as the RF input or the RF output. An external supply voltage of 2.7 to 5.5 V is required. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200218C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 4, 2011 1 DATA SHEET • SKY12322-86LF 5-BIT DIGITAL ATTENUATOR Figure 2. SKY12322-86LF Pinout – 10-Pin MSOP-10 (Top View) Table 1. SKY12322-86LF Signal Descriptions Pin # Name Description Pin # Name Description 1 V1 High impedance control voltage input for 0.5 dB weighted bit (LSB) 6 J2 RF input or output port, supply voltage input 2 V2 High impedance control voltage input for 1 dB weighted bit 7 GND Ground 3 V3 High impedance control voltage input for 2 dB weighted bit 8 GND Ground 4 V4 High impedance control voltage input for 4 dB weighted bit 9 GND Ground 5 V5 High impedance control voltage input for 8 dB weighted bit (MSB) 10 J1 RF input or output port Electrical and Mechanical Specifications The absolute maximum ratings of the SKY12322-86LF are provided in Table 2. Electrical specifications are provided in Table 3. The state of the SKY12322-86LF is determined by the logic provided in Table 4. Typical performance characteristics of the SKY12322-86LF are illustrated in Figures 3 through 6. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 March 4, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200218C DATA SHEET • SKY12322-86LF 5-BIT DIGITAL ATTENUATOR Table 2. SKY12322-86LF Absolute Maximum Ratings Parameter Symbol Minimum Typical Maximum Units 3 8 V RF input power (VCTL = 0/8 V) PIN Supply voltage VS Control voltage VCTL –0.2 +8.0 V Operating temperature TOP –40 +85 °C Storage temperature TSTG –65 +150 °C Note: 1 W for f > 500 MHz 0.5 W for f < 500 MHz 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 3. SKY12322-86LF Electrical Specifications (Note 1) (VCTL = 0/3 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted) Parameter Insertion loss Symbol IL Test Condition Min 0.5 to 1.0 GHz 1.0 to 2.0 GHz 2.0 to 3.0 GHz 3.0 to 4.0 GHz Attenuation range (Note 2) Attenuation accuracy (Note 2) Return loss 0.5 to 1.0 GHz 1.0 to 3.0 GHz 3.0 to 4.0 GHz RL Switching characteristics: Rise/fall time On/off time Video feedthrough Input power for 1 dB compression 0.5 to 4.0 GHz IIP3 ΘJC Supply voltage VS Control voltage: Low High VCTL VLOW VHIGH Control current ICTL 1.4 1.5 2.3 3.0 2.0 2.5 3.0 3.5 dB dB dB dB ±(0.2 + 3% of attenuation setting) ±(0.3 + 5% of attenuation setting) ±(0.5 + 5% of attenuation setting) dB dB dB 10 20 dB 150 300 ns ns 70 mV +21 +27 dBm dBm +45 +45 dBm dBm 25 °C/W 0.9 to 4.0 GHz: For two-tone input power, +5 dBm/tone, Δf = 1 MHz, 0.9 to 4.0 GHz: VCTL = 0 to 3 V, VCTL = 0 to 5 V Thermal resistance Units dB VCTL = 0 to 3 V, VCTL = 0 to 5 V 3rd Order Input Intercept Point Max 15.5 10/90% or 90/10% RF 50% VCTL to 90/10% RF TRISE = 1 ns, bandwidth = 500 MHz IP1dB Typical 2.8 –0.2 VS – 0.2 VCTL = 0 V VCTL = 3 V VCTL = 5 V 3.0 8.0 V +0.2 VS + 0.2 V V 20 100 200 μA μA μA Note 1: Performance is guaranteed only under the conditions listed in this Table. Note 2: Attenuation referenced to insertion loss. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200218C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 4, 2011 3 DATA SHEET • SKY12322-86LF 5-BIT DIGITAL ATTENUATOR Typical Performance Characteristics (VS = 5 V, VCTL = 0 to 3 V, TOP = +25 °C, CBLK = 39 pF, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, , Unless Otherwise Noted) Figure 3. Insertion Loss vs Frequency Figure 4. Attenuation vs Frequency (Normalized to Insertion Loss) Figure 5. Attenuation vs Frequency (Normalized to Insertion Loss) Figure 6. Insertion Loss vs Frequency Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 March 4, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200218C DATA SHEET • SKY12322-86LF 5-BIT DIGITAL ATTENUATOR Table 4. SKY12322-86LF Truth Table Nominal Attenuation V1 (Pin 1) V2 (Pin 2) V3 (Pin 3) V4 (Pin 4) V5 (Pin 5) Reference insertion loss VHIGH VHIGH VHIGH VHIGH VHIGH 0.5 dB VLOW VHIGH VHIGH VHIGH VHIGH 1.0 dB VHIGH VLOW VHIGH VHIGH VHIGH 2.0 dB VHIGH VHIGH VLOW VHIGH VHIGH 4.0 dB VHIGH VHIGH VHIGH VLOW VHIGH 8.0 dB VHIGH VHIGH VHIGH VHIGH VLOW 15.5 dB VLOW VLOW VLOW VLOW VLOW Note: VHIGH = +3 V to 5 V. VLOW = 0 V to +0.2 V. 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. Evaluation Board Description Package and Handling Information The SKY12322-86LF Evaluation Board is used to test the performance of the SKY12322-86LF digital attenuator. An assembly drawing for the Evaluation Board is shown in Figure 7 and an Evaluation Board schematic diagram is shown in Figure 8. Instructions on the shipping container label regarding exposure to moisture after the container seal is broken must be followed. Otherwise, problems related to moisture absorption may occur when the part is subjected to high temperature during solder assembly. Package Dimensions Package dimensions for the 10-pin MSOP-10 are shown in Figure 9, and tape and reel dimensions are provided in Figure 10. THE SKY12322-86LF is rated to Moisture Sensitivity Level 1 (MSL1) at 260 °C. It can be used for lead or lead-free soldering. For additional information, refer to the Skyworks Application Note, Solder Reflow Information, document number 200164. Care must be taken when attaching this product, whether it is done manually or in a production solder reflow environment. Production quantities of this product are shipped in a standard tape and reel format. Figure 7. SKY12322-86LF Evaluation Board Assembly Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200218C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 4, 2011 5 DATA SHEET • SKY12322-86LF 5-BIT DIGITAL ATTENUATOR Figure 8. SKY12322-86LF Evaluation Board Schematic Diagram Figure 9. SKY12322-86LF 10-Pin MSOP-10 Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 March 4, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200218C DATA SHEET • SKY12322-86LF 5-BIT DIGITAL ATTENUATOR Figure 10. SKY12322-86LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200218C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • March 4, 2011 7 DATA SHEET • SKY12322-86LF 5-BIT DIGITAL ATTENUATOR Ordering Information Model Name SKY12322-86LF Digital Attenuator Manufacturing Part Number SKY12322-86LF Evaluation Board Part Numbers SKY12322-86LF-EVB Copyright © 2002-2006, 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. 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