DATA SHEET SKY12355-337LF: 0.35-4.0 GHz Two-Bit Digital Attenuator Applications • Cellular infrastructure • Wireless receivers Features • Positive voltage operation with integrated decoder • Broadband operation: 0.35 to 4.0 GHz • Attenuation: 18 dB with 6 dB LSB • Low insertion loss: 0.6 dB @ 2 GHz • Absorptive in 50 Ω systems • Small, QFN (12-pin, 3 x 3 mm) package (MSL1, 260 °C per JEDEC J-STD-020) Figure 1. SKY12355-337LF Block Diagram Description The SKY12355-337LF is a GaAs pHEMT two-bit digital attenuator I/C. The device is provided in a 3 x 3 mm, 12-pin Quad Flat NoLead (QFN) package. The SKY12355-337LF is particularly suited for low-cost commercial applications for 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. Figure 2. SKY12355-337LF Pinout – 12-Pin QFN (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202281C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 11, 2012 1 DATA SHEET • SKY12355-337LF TWO-BIT DIGITAL ATTENUATOR Table 1. SKY12355-337LF Signal Descriptions Pin # Note: Name Description Pin # Name Description 1 GND Ground 7 N/C No connection required. May be connected to ground with no change in performance. 2 RF1 RF port. Must be DC blocked. 8 RF2 RF port. Must be DC blocked. 3 N/C No connection required. May be connected to ground with no change in performance. 9 GND Ground 4 N/C No connection required. May be connected to ground with no change in performance. 10 VCTL2 DC control voltage. Controls 12 dB attenuation state. Refer to Table 4. 5 N/C No connection required. May be connected to ground with no change in performance. 11 VCTL1 DC control voltage. Controls 6 dB attenuation state. Refer to Table 4. 6 N/C No connection required. May be connected to ground with no change in performance. 12 VDD DC power supply. Exposed pad must be grounded. Table 2. SKY12355-337LF Absolute Maximum Ratings Parameter Symbol Supply voltage VDD Control voltage VCTL1, VCTL2 RF input power @ 3 V PIN Operating temperature TOP Storage temperature TSTG Note: Minimum Typical Maximum Units 5.5 V VDD + 0.1 V +28 dBm –40 +85 °C –65 +150 °C 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. Attention: Observe Precautions for Handling Electrostatic Sensitive Devices ESD Human Body Model (HBM) = 250 V (Class 1A) ESD Machine Model (MM) = 100 V (Class A) ESD Charged Device Model (CDM) = 1000 V (Class 4) Electrostatic Discharge (ESD) can damage this device, which must be protected from ESD at all times. 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. Functional Description Electrical and Mechanical Specifications This attenuator has a least significant bit (LSB) of 6 dB and a most significant bit (MSB) of 12 dB for a total of 18 dB available attenuation. Pins 10 and 11 (VCTL2 and VCTL1) control the state of the 6 dB and 12 dB attenuation bits, respectively. For each bit, a logic high enables the attenuation state while a logic low enables a low insertion loss state. The absolute maximum ratings of the SKY12355-337LF are provided in Table 2. Electrical specifications are provided in Table 3. The state of the SKY12355-337LF is determined by the logic provided in Table 4. The VCTL1 and VCTL2 signals control the 6 dB and 12 dB attenuation bits, respectively. For each bit, a logic high enables the attenuation state, while a logic low enables the insertion loss state. Typical performance characteristics are illustrated in Figures 3 to 6. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 December 11, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202281C DATA SHEET • SKY12355-337LF TWO-BIT DIGITAL ATTENUATOR Table 3. SKY12355-337LF Electrical Specifications (1 of 2) (Note 1) (VDD = 3 V, VCTL = 0 to 3 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, C1 & C2 = 1000 pF, Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units 0.45 0.60 0.65 0.75 0.80 0.80 0.90 1.00 dB dB dB dB Insertion loss IL 350 to 500 MHz 500 MHz to 2 GHz 2 GHz to 3 GHz 3 GHz to 4 GHz Attenuation accuracy Att @ 6 dB: 350 MHz to 500 MHz 500 MHz to 2 GHz 2 GHz to 3 GHz 3 GHz to 4 GHz 5.7 6.0 6.1 6.1 6.0 6.3 6.4 6.4 6.3 6.6 6.7 6.7 dB dB dB dB @ 12 dB: 350 MHz to 500 MHz 500 MHz to 2 GHz 2 GHz to 3 GHz 3 GHz to 4 GHz 11.9 11.9 11.9 11.8 12.2 12.3 12.2 12.1 12.5 12.6 12.5 12.4 dB dB dB dB @ 18 dB: 350 MHz to 500 MHz 500 MHz to 2 GHz 2 GHz to 3 GHz 3 GHz to 4 GHz 17.9 18.3 18.3 18.2 18.3 18.7 18.7 18.6 18.7 19.1 19.1 19.0 dB dB dB dB 10 14 12 12 20 22 19 19 dB dB dB dB 10% RF to 90% RF or 90% RF to 10% RF 8 ns 50% VCTL to 90% RF or 50% VCTL to 10% RF 37 Return loss |S11| Switching characteristics: Rise/fall time On/off time Attenuation amplitude settling 350 to 500 MHz 500 MHz to 2 GHz 2 GHz to 3 GHz 3 GHz to 4 GHz 500 ns to 5 ms Phase settling (by design) 500 ns to 5 ms ns 0.25 –2 +2 dB deg 1 dB Input Compression Point IP1dB VCTL = 3 V, 500 MHz to 4 GHz, insertion state +28 dBm 0.1 dB Input Compression Point IP0.1dB VCTL = 3 V, 500 MHz to 4 GHz, all states +19 dBm Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202281C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 11, 2012 3 DATA SHEET • SKY12355-337LF TWO-BIT DIGITAL ATTENUATOR Table 3. SKY12355-337LF Electrical Specifications (2 of 2) (Note 1) (VDD = 3 V, VCTL = 0 to 3 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, C1 & C2 = 1000 pF, Unless Otherwise Noted) Parameter rd 3 Order Input Intercept Point Supply voltage Symbol IIP3 Test Condition Min Typical Units Insertion loss state +48 +50 dBm All attenuation states +44 +47 dBm Tone spacing = 20 MHz, power/tone = +18 dBm, VDD = VCTL1 = VCTL2 = 3.3 V, 500 MHz to 4 GHz: VDD Control voltage VDD VCTL = low VCTL = high Control current VCTL = low and VCTL = high Supply current Max 3 5 V 3 0 0.7 × VDD 5 0.3 × VDD VDD V V V μA 10 IDD 20 μA 50 Note 1: Performance is guaranteed only under the conditions listed in this Table. Table 4. SKY12355-337LF Truth Table VDD VCTL1 VCTL2 Insertion loss State high low low 6 dB high high low 12 dB high low high 18 dB high high high Note: high = 0.7 × VDD to VDD low = 0 to 0.3 × VDD Any state other than described in this Table places the attenuator into an undefined state. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 December 11, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202281C DATA SHEET • SKY12355-337LF TWO-BIT DIGITAL ATTENUATOR Typical Performance Characteristics (VDD = 3 V, VCTL = 0 to 3 V, TOP = +25 °C, PIN = 0 dBm, Characteristic Impedance [ZO] = 50 Ω, C1 & C2 = 1000 pF, Unless Otherwise Noted) Figure 3. Insertion Loss vs Frequency Figure 4. Attenuation vs Frequency (Normalized to Insertion Loss) Figure 5. Attenuation Error vs Frequency (Normalized to Insertion Loss) Figure 6. Return Loss vs Frequency Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202281C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 11, 2012 5 DATA SHEET • SKY12355-337LF TWO-BIT DIGITAL ATTENUATOR Evaluation Board Description Package and Handling Information The SKY12355-337LF Evaluation Board is used to test the performance of the SKY12355-337LF digital attenuator. An Evaluation Board schematic diagram is shown in Figure 7. Table 5 provides the Bill of Materials (BOM) list for Evaluation Board components. An assembly drawing for the Evaluation Board 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 The PCB layout footprint for the SKY12355-337LF is shown in Figure 9. Typical case markings are noted in Figure 10. Package dimensions for the 12-pin QFN are shown in Figure 11, and tape and reel dimensions are provided in Figure 12. The SKY12355-337LF 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. SKY12355-337LF Evaluation Board Schematic Diagram Table 5. SKY12355-337LF Evaluation Board Bill of Materials Component C1, C2 Note: Value 1000 pF Size 0402 Manufacturer/Part Series Murata GRM Series Blocking capacitors are required on both RF ports for proper functionality. Value of DC blocking capacitor determines lower frequency operation. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 December 11, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202281C DATA SHEET • SKY12355-337LF TWO-BIT DIGITAL ATTENUATOR Figure 8. SKY12355-337LF Evaluation Board Assembly Diagram Figure 9. SKY12355-337LF PCB Layout Footprint Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202281C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 11, 2012 7 DATA SHEET • SKY12355-337LF TWO-BIT DIGITAL ATTENUATOR Figure 10. Typical Part Markings Figure 11. SKY12355-337LF 12-Pin QFN Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 December 11, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202281C DATA SHEET • SKY12355-337LF TWO-BIT DIGITAL ATTENUATOR Figure 12. SKY12355-337LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202281C • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • December 11, 2012 9 DATA SHEET • SKY12355-337LF TWO-BIT DIGITAL ATTENUATOR Ordering Information Model Name SKY12355-337LF Digital Attenuator Manufacturing Part Number SKY12355-337LF Evaluation Board Part Numbers SKY12355-337LF-EVB Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 December 11, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 202281C