DATA SHEET SKY12406-360LF: 50-600 MHz One-Bit Digital Attenuator (12 dB LSB) Applications • Cellular radio • Wireless data • WLL gain level control circuits Features • Positive voltage control: 0/3 V • High bit accuracy • Low loss • Absorptive in 50 W systems • Small, QFN (8-pin, 2 x 2 mm) package (MSL1, 260 °C per JEDEC J-STD-020) Figure 1. SKY12406-360LF Block Diagram Description The SKY12406-360LF is a pHEMT GaAs FET I/C single bit attenuator designed for low-cost commercial applications where high attenuation accuracy, low insertion loss, and low intermodulation products are required. The attenuator has an LSB of 12 dB. The SKY12406-360LF is manufactured in a compact, 2 x 2 mm, 8-pin exposed pad plastic Quad Flat No-Lead (QFN) package. 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. Figure 2. SKY12406-360LF Pinout – 8-Pin QFN (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200965B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 24, 2011 1 DATA SHEET • SKY12406-360LF ONE-BIT DIGITAL ATTENUATOR Table 1. SKY12406-360LF Signal Descriptions Pin # Name Description Pin # Name Description 1 RF1 RF port 5 GND Ground 2 GND Ground 6 VCTL2 DC control voltage 3 VCTL1 DC control voltage 7 GND Ground 4 CBP RF ground. Must be AC-coupled to ground. 8 RF2 RF port Table 2. SKY12406-360LF Absolute Maximum Ratings Parameter Symbol Minimum Maximum Units +24 +27 dBm dBm RF input power: 3 V @ 50 MHz 3 V @ 600 MHz PIN 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. Electrical and Mechanical Specifications The absolute maximum ratings of the SKY12406-360LF are provided in Table 2. Electrical specifications are provided in Table 3. Typical performance characteristics of the SKY12406-360LF are illustrated in Figures 3 through 6. The state of the SKY12406-360LF is determined by the logic provided in Table 4. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 January 24, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200965B DATA SHEET • SKY12406-360LF ONE-BIT DIGITAL ATTENUATOR Table 3. SKY12406-360LF Electrical Specifications (Note 1) (VCTL = 0/3 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 IL 50-600 MHz 0.3 0.4 dB Attenuation Attn 50-600 MHz 11.6 12.0 12.4 dB Return loss RL 50-600 MHz 15 20 Switching characteristics: Rise/fall time On/off time Input power for 0.1 dB compression 3rd Order Input Intercept Point 7 8 10/90% or 90/10% RF 50% VCTL to 90/10% RF IIP3 Control voltage: Low High VCTL_L VCTL_H Control current ICC dB 35 35 ns ns @ 50 MHz @ 600 MHz +18 +20 +22 +25 dBm dBm Two tone input power, +10 dBm/tone, 50 MHz, 1 MHz spacing +42 +46 dBm Two tone input power, +10 dBm/tone, 600 MHz +44 +50 dBm 0 2.7 10 0.2 3.3 V V 50 μA Note 1: Performance is guaranteed only under the conditions listed in this Table. Typical Performance Characteristics (VCTL = 3 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, CBP = 560 pF, Blocking Capacitor = 560 pF Unless Otherwise Noted) Figure 3. Typical Insertion Loss Figure 4. Typical Attenuation Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200965B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 24, 2011 3 DATA SHEET • SKY12406-360LF ONE-BIT DIGITAL ATTENUATOR Figure 5. Typical Return Loss (Insertion Loss State) Figure 6. Typical Return Loss (Attenuation State) Table 4. SKY12406-360LF Truth Table Note: VCTL1 (Pin 3) VCTL2 (Pin 6) 1 0 Insertion loss RF1 to RF2 Path 0 1 Attenuation “1” = +3 V. “0” = 0 V. Any state other than that described in this Table places the attenuator into an undefined state. Evaluation Board Description Package and Handling Information The SKY12406-360LF Evaluation Board is used to test the performance of the SKY12406-360LF Attenuator. An assembly drawing for the Evaluation Board is shown in Figure 7. 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. DC blocks are required on RF1 (pin 1) and RF2 (pin 8). A blocking capacitor (CBLK) of 560 pF and a bypass capacitor (CBP) of 560 pF are required for 50 MHz operation. Package Dimensions THE SKY12406-360LF 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. The PCB layout footprint for the SKY12406-360LF is provided in Figure 8. Typical case markings are shown in Figure 9. Package dimensions for the 8-pin QFN are shown in Figure 10, and tape and reel dimensions are provided in Figure 11. 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. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 January 24, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200965B DATA SHEET • SKY12406-360LF ONE-BIT DIGITAL ATTENUATOR Figure 7. SKY12406-360LF Evaluation Board Assembly Diagram Figure 8. SKY12406-360LF PCB Layout Footprint Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200965B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 24, 2011 5 DATA SHEET • SKY12406-360LF ONE-BIT DIGITAL ATTENUATOR Figure 9. Typical Case Markings (Top View) Figure 10. SKY12406-360LF 8-Pin QFN Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 January 24, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200965B DATA SHEET • SKY12406-360LF ONE-BIT DIGITAL ATTENUATOR Figure 11. SKY12406-360LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200965B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • January 24, 2011 7 DATA SHEET • SKY12406-360LF ONE-BIT DIGITAL ATTENUATOR Ordering Information Model Name SKY12406-360LF One-Bit Digital Attenuator Manufacturing Part Number SKY12406-360LF Evaluation Board Part Number SKY12406-360LF-EVB Copyright © 2008, 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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