DATA SHEET SKY12338-337LF: 0.35 to 4.0 GHz Two-Bit Digital Attenuator Applications RF1 Cellular infrastructure Wireless receivers VCTL1 6 dB VCTL2 12 dB Features Positive voltage operation: 2.65 to 5 V per bit Broadband operation: 0.35 to 4.0 GHz Attenuation: 18 dB with 6 dB LSB Low insertion loss: 0.75 dB @ 2 GHz Absorptive in 50 Ω systems VDD RF2 Small, QFN (12-pin, 3 x 3 mm) package (MSL1, 260 C per JEDEC J-STD-020) S1744 Figure 1. SKY12338-337LF Block Diagram Skyworks Green™ products are compliant with all applicable legislation and are halogen-free. For additional information, refer to Skyworks Definition of Green™, document number SQ04-0074. Description The SKY12338-337LF 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 SKY12338-337LF is particularly suited for low-cost commercial applications for which high attenuation accuracy, low insertion loss, and low intermodulation products are required. VCTL1 12 11 VCTL2 VDD 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. 10 RF1 2 8 RF2 N/C 3 7 N/C 4 5 6 N/C N/C N/C 9 N/C N/C 1 S1745 Figure 2. SKY12338-337LF Pinout – 12-Pin QFN (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201165G • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 30, 2014 1 DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR Table 1. SKY12338-337LF Signal Descriptions (Note 1) Pin Name Description Pin Name Description 1 N/C No connection required. May be connected to ground with no change in performance. 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 N/C No connection required. May be connected to ground with no change in performance. 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. Note 1: Exposed pad must be grounded. Table 2. SKY12338-337LF Absolute Maximum Ratings (Note 1) Parameter Supply voltage Symbol Minimum VDD Control voltage VCTL1, VCTL2 RF input power @ 3 V PIN Typical Maximum Units 5.5 V VDD + 0.1 V +27 dBm Operating temperature TOP –40 +85 C Storage temperature TSTG –65 +150 C Note 1: 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. 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 low enables the attenuation state while a logic high enables a low insertion loss state. The absolute maximum ratings of the SKY12338-337LF are provided in Table 2. Electrical specifications are provided in Table 3. The state of the SKY12338-337LF 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 low enables the attenuation state, while a logic high enables the insertion loss state. Typical performance characteristics are illustrated in Figure 3 to Figure 6. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 May 30, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201165G DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR Table 3. SKY12338-337LF Electrical Specifications (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 0.80 1.00 1.20 1.50 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 0.55 0.75 1.00 1.30 Attenuation accuracy Att 350 to 500 MHz 500 MHz to 2 GHz 2 GHz to 3 GHz 3 GHz to 4 GHz ±(0.5 + 2% of attenuation setting) ±(0.2 + 3% of attenuation setting) ±(0.3 + 3% of attenuation setting) ±(0.4 + 3% of attenuation setting) dB dB dB dB Return loss |S11| 350 to 500 MHz 500 MHz to 2 GHz 2 GHz to 4 GHz 12 15 15 dB dB dB 100 ns Switching characteristics: Rise/fall time 10 13 12 50% VCTL to 90% RF or 10 to 90% RF On/off time 50% VCTL to 10% RF or 90 to 10% RF Attenuation phase settling (Note 2) Phase change from 500 ns to 5 ms ns 100 –2 +2 deg 0.25 dB Attenuation settling amplitude ATSET Amplitude change from 500 ns to 5 ms 1 dB Input Compression Point IP1dB VCTL = 2.65 V, 350 to 500 MHz, insertion state +30 dBm VCTL = 3 V, 500 MHz to 4 GHz, insertion state +27 dBm VCTL = 2.65 V, 350 to 500 MHz, all states +20 dBm VCTL = 3 V, 500 MHz to 4 GHz, all states +20 dBm VCTL = 2.65 V, 350 to 500 MHz, insertion state +45 dBm VCTL = 2.65 V, 350 to 500 MHz, all states +44 dBm VCTL = 3 V, 500 MHz to 4 GHz, insertion state +45 dBm VCTL = 3 V, 500 MHz to 4 GHz, all states +45 dBm 0.1 dB Input Compression Point rd 3 Order Input Intercept Point IP0.1dB IIP3 Supply voltage VDD Supply current IDD 2.65 380 5.00 V 450 μA 0.4 VDD + 0.1 0.4 VDD + 0.1 V V V V Control voltage: Low with VDD = 5 V High with VDD = 5 V Low with VDD = 3.3 V or 3 V High with VDD = 3.3 V or 3 V VCTL_LOW VCTL_HIGH VCTL_LOW VCTL_HIGH Control current 0 4 0 2.6 VCTL = low VCTL = high 10 250 μA μA Note 1: Performance is guaranteed only under the conditions listed in this table. Note 2: Not measured. Performance guaranteed by design. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201165G • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 30, 2014 3 DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR Table 4. SKY12338-337LF Truth Table (Note 1) State VDD VCTL1 VCTL2 Insertion loss high high high 6 dB high low high 12 dB high high low 18 dB high low low Note 1: High = refer to “Control voltage” in Table 3. Low = refer to “Control voltage” in Table 3. Any state other than described in this table places the attenuator into an undefined state. 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) 0 0 –4 Attenuation (dB) –0.5 Insertion Loss (dB) 6 dB 12 dB 18 dB –1.0 –1.5 –2.0 –8 –12 –16 –2.5 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 –20 5.0 0 0.5 1.0 1.5 Frequency (GHz) Figure 3. Insertion Loss vs Frequency 3.0 3.5 0 6 dB 12 dB 18 dB +4 4.0 +3 +2 +1 0 –1 –2 5.0 –10 4.5 5.0 –15 –20 –25 –30 –35 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Frequency (GHz) Figure 5. Attenuation Error vs Frequency (Normalized to Insertion Loss) 4.5 5.0 –40 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 Frequency (GHz) Figure 6. Return Loss vs Frequency Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 4.5 Insertion Loss 6 dB 12 dB 18 dB –5 Return Loss (dB) Attenuation Error (dB) 2.5 Figure 4. Attenuation vs Frequency (Normalized to Insertion Loss) +5 –3 –4 2.0 Frequency (GHz) May 30, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201165G DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR Evaluation Board Description Package and Handling Information The SKY12338-337LF Evaluation Board is used to test the performance of the SKY12338-337LF 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 SKY12338-337LF 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. The PCB layout footprint for the SKY12338-337LF 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. 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. Control Voltage (0/2.65-5.00 V) Control Voltage (0/2.65-5.00 V) Supply Voltage (2.65-5.00 V) 2 RF1 3 N/C RF1 RF2 N/C N/C N/C × VCTL2 N/C 4 × 5 × 9 × C2 8 7 RF2 × N/C C1 1 N/C × 10 VCTL1 11 VDD 12 6 × S1747 Figure 7. SKY12338-337LF Evaluation Board Schematic Diagram Table 5. SKY12338-337LF Evaluation Board Bill of Materials (Note 1) Component C1, C2 Value 1000 pF Size 0402 Manufacturer/Part Series Murata GRM Series Note 1: 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 201165G • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 30, 2014 5 DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR S1746 Figure 8. SKY12338-337LF Evaluation Board Assembly Diagram 12X 0.95 (To Metal Pads) 1.15 (Sq.) Solder Area Pitch 0.50 4X Ground Vias See Detail A 0.25 Solder Area 0.75 All measurements in millimeters Detail A 12X Scale = 48X S1855 Figure 9. SKY12338-337LF PCB Layout Footprint Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 May 30, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201165G DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR Pin 1 Indicator Skyworks Part # Lot # Date Code: (Y = Calendar Year WW = Week) Figure 10. Typical Part Markings 1.150 +0.10/–0.15 C (0.20) Seating Plane 0.02 + 0.03/–0.02 A 3 B Pin 1 Indicator 1.000 0.575 Exposed Pad Detail A 0.575 3 1.000 1.150 +0.10/–0.15 B 0.15 C 2X Detail C 0.90 ± 0.10 2X 0.10 C Top View 0.20 Min. 12X 12X 4 0.08 C 0.15 C Side View A Detail B Bottom View R0.125 Typ. 0.18 0.55 +0.10 0.18 0.435 5 0.10 M C A B 0.435 0.5 0.25 +0.05/–0.07 0.05 M C Detail A Detail B Detail C Scale: 20X Scale: 20X Scale: 40X 12 Places All measurements are in millimeters. Dimensioning and tolerancing according to ASME Y14.5M-1994. Unilateral coplanarity applies to the exposed heat sink slug as well as the terminals. Plating requirement per source control drawing (SCD) 2504. Dimension applies to metallized terminal and is measured between 0.15 and 0.30 mm from the terminal tip. Do not measure at radius area. S1866 Figure 11. SKY12338-337LF 12-Pin QFN Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201165G • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 30, 2014 7 DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR 8.00 2.00 ± 0.05 (See Note 3) ø1.50 Min. 4.00 (See Note 1) 0.30 ± 0.05 Pin 1 Indicator ø1.5 +0.1/–0 A 1.75 ± 0.10 R0.3 Max 5.50 ± 0.05 (See Note 3) 12.0 ± 0.3 3.30 (Bo) A 1.10 (Ko) A 3.30 (Ao) 0.25 R0.25 Notes: 1. Sprocket hole pitch cumulative tolerance: ±0.2. 2. Carrier tape: black conductive polystyrene. 3. Pocket position relative to sprocket hole, measure as true position of pocket, not pocket hole. 4. Cover tape: transparent conductive material. 5. All dimensions are in millimeters. Y0880 Figure 12. SKY12338-337LF Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 May 30, 2014 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201165G DATA SHEET • SKY12338-337LF: TWO-BIT DIGITAL ATTENUATOR Ordering Information Model Name SKY12338-337LF: Digital Attenuator Manufacturing Part Number SKY12338-337LF Evaluation Board Part Numbers SKY12338-337LF-EVB Copyright © 2009, 2011-2012, 2014 Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. 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Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201165G • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • May 30, 2014 9