DATA SHEET SKY65126-21: 800-900 MHz High Linearity 2 W Power Amplifier Applications • WCDMA/CDMA/TDMA/GSM/LTE • Repeaters • WLL and ISM band transmitters • Mobile radios • Femto cell base stations Features Figure 1. SKY65126-21 Block Diagram • High linearity: OIP3 > +48 dBm • P1dB = +32.5 dBm Description • ACLR ≤ –45 dBc for POUT = +24.5 dBm Skyworks SKY65126-21 is a fully-matched, surface mount Power Amplifier (PA) designed for WCDMA, CDMA, TDMA, GSM, and LTE radio, repeaters, transmitters, mobile radios, and Femto cell base station applications operating in the 800 to 900 MHz band. • EVM < 3% for POUT = +25 dBm (OFDM, 64-QAM) • High efficiency: PAE = 29% • Output power detector: 20 dB dynamic range • High gain = 32 dB • Internal RF match and bias circuits • Single DC supply: 5 V • Small footprint, MCM (20-pin, 6 x 6 mm) SMT package (MSL3, 260 °C per JEDEC J-STD-020) The device is fabricated using Skyworks GaAs Heterojunction Bipolar Transistor (HBT) process, which allows for single supply operation while maintaining high efficiency and good linearity. A block diagram of the SKY65126-21 is shown in Figure 1. The device package and pinout for the 20-pin MCM are shown in Figure 2. Figure 2. SKY65126-21 Pinout – 20-Pin MCM (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200954F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 13, 2012 1 DATA SHEET • SKY65126-21 800-900 MHZ HIGH LINEARITY PA Table 1. SKY65126-21 Signal Descriptions Pin # Name Description Pin # Name Description 1 GND Ground 11 VCC2 Stage 2 collector voltage 2 GND Ground 12 N/C No connection 3 GND Ground 13 VCC1 Stage 1 collector voltage 4 VC_BIAS Bias voltage 14 N/C No connection 5 N/C No connection 15 N/C No connection 6 VREF1 Bias reference voltage 1 16 RF_IN RF input 7 VREF2 Bias referance voltage 2 17 GND Ground 8 GND Ground 18 N/C No connection 9 RF_OUT RF output 19 GND Ground 10 GND Ground 20 GND Ground Table 2. SKY65126-21 Absolute Maximum Ratings Maximum Units RF input power Parameter PIN Symbol Minimum 0 dBm Supply voltage VC_BIAS, VREF1, VREF2, VCC1, and VCC2 6 V Operating temperature TOP –40 +85 °C Storage temperature TST –55 +125 °C Junction temperature TJ +150 °C Thermal resistance ΘJC 20 °C/W 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. Technical Description Electrical and Mechanical Specifications The SKY65126-21 PA contains two amplifier stages. The matching circuits for the input stage, interstage, and output stage are contained within the device. An on-chip active bias circuit is included within the device for both input and output stages, which provides excellent gain tracking over temperature and voltage variations. Signal pin assignments and functional pin descriptions are described in Table 1. The absolute maximum ratings of the SKY65126-21 are provided in Table 2. Recommended operating conditions are specified in Table 3 and electrical specifications are provided in Table 4. The SKY65126-21 is internally matched for optimum linearity and efficiency. The input and output stages are independently supplied using the VCC1 and VCC2 supply lines (pins 13 and 11, respectively). The bias reference voltages for stages 1 and 2 are supplied using common lines VREF1 and VREF2 (pins 6 and 7, respectively). The DC control voltage that sets the bias to stages 1 and 2 is supplied by the VC_BIAS signal (pin 4). Typical performance characteristics are shown in Figures 3 through 7. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 February 13, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200954F DATA SHEET • SKY65126-21 800-900 MHZ HIGH LINEARITY PA Table 3. SKY65126-21 Recommended Operating Conditions Parameter Symbol Minimum Supply voltage VC_BIAS, VREF1, VREF2, VCC1, and VCC2 Operating frequency f 800 Operating temperature TOP –40 Typical Maximum Units 5 V +25 900 MHz +85 °C Table 4. SKY65126-21 Electrical Specifications (Note 1) (VCC1 = VCC2 = VREF1 = VREF2 = VC_BIAS = 5 V, TC = +25 °C, f = 850 MHz, Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units 900 MHz Frequency f 800 Small signal gain |S21| 30 Input return loss (small signal) |S11| 9 11 dB Output return loss (small signal) |S22| 12 17 dB 1 dB Output Compression Point OP1dB CW +30.5 +32.5 dBm OIP3 POUT/tone = +19 dBm, tone spacing = 1 MHz +45 +48 dBm rd 3 Order Output Intercept Point 32 dB Noise Figure NF CW 4.5 6.0 dB Adjacent Channel Leakage Ratio @ POUT = +24.5 dBm ACLR WCDMA test tone #1: 64 DPCH, Δf = 5 MHz –47 –45 dBc Quiescent Current ICCQ No RF signal 283 340 mA Operational current IOP POUT = +25 dBm 540 650 mA Note 1: Performance is guaranteed only under the conditions listed in this Table. Typical Performance Characteristics (VCC1 = VCC2 = VREF1 = VREF2 = VC_BIAS = 5 V, TC = +25 °C, f = 850 MHz, Unless Otherwise Noted) Figure 3. S-Parameters vs Frequency Figure 4. Gain vs Output Power Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200954F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 13, 2012 3 DATA SHEET • SKY65126-21 800-900 MHZ HIGH LINEARITY PA Figure 5. OIP3 vs Output Power (Tone Spacing = 1 MHz) Figure 6. Noise Figure vs Frequency Figure 7. ACLR vs Output Power (WCDMA Test Tone #1, 64 DPCH, Δf = 5 MHz Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 February 13, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200954F DATA SHEET • SKY65126-21 800-900 MHZ HIGH LINEARITY PA Evaluation Board Description The SKY65126-21 Evaluation Board is used to test the performance of the SKY65126-21 PA. An Evaluation Board schematic diagram is provided in Figure 8. Table 5 provides the Bill of Materials (BOM) list for Evaluation Board components. An assembly drawing for the Evaluation Board is shown in Figure 9. An Evaluation Board layer detail drawing is shown in Figure 10. Layer detail physical characteristics are noted in Figure 11. Circuit Design Considerations The following design considerations are general in nature and must be followed regardless of final use or configuration: 1. Paths to ground should be made as short as possible. 2. The ground pad of the SKY65126-21 has special electrical and thermal grounding requirements. This pad is the main thermal conduit for heat dissipation. Since the circuit board acts as the heat sink, it must shunt as much heat as possible from the device. Therefore, design the connection to the ground pad to dissipate the maximum wattage produced by the circuit board. Multiple vias to the grounding layer are required. NOTE: A poor connection between the slug and ground increases junction temperature (TJ), which reduces the lifetime of the device. Evaluation Board Test Procedure Step 1: Connect RF test equipment to the input/output SMA connectors. Step 2: Connect DC ground. Step 3: Connect all VDD, VREG, and VC_BIAS lines to a +5 V supply. Verify that the ICCQ current is approximately 271 mA. Step 4: Apply RF signal data at –20 dBm and observe that the output level is approximately +11.5 dBm or that the gain of the device is approximately 31.5 dB. NOTE: It is important to adjust the VCC1 and VCC2 voltage sources so that +5 V is measured at the board. High collector currents drop the collector voltage significantly if long leads are used. Adjust the bias voltage to compensate. Figure 8. SKY65126-21 Evaluation Board Schematic Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200954F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 13, 2012 5 DATA SHEET • SKY65126-21 800-900 MHZ HIGH LINEARITY PA Table. 5. SKY65126-21 Evaluation Board Bill of Materials (BOM) Component Value Size 0603 Product # C1, C6, C11 3300 pF SK204-000-007 C2, C3, C7, C10 68 pF 0603 5404R23-023 C8, C12, C13 10 μF 1206 5404R91-005 R1 360 Ω 0603 5424R20-038 R2 330 Ω 0603 5424R20-037 Manufacturer Murata Manufacturer’s Part # Characteristics GRM188R71H332KA01D X7R, 50 V, ±10% Murata GRM1885C1H680JA01D C0G, 50 V, ±5% TDK C3216X5R0J106KT X5R, 6 V, ±10% Rohm MCR03EZHUJ360 50 V, 0.63 W, ±5% Rohm MCR03EZHUF330 50 V, 0.63 W, ±5% Figure 9. Evaluation Board Assembly Drawing Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 February 13, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200954F DATA SHEET • SKY65126-21 800-900 MHZ HIGH LINEARITY PA Figure 10. Evaluation Board Layer Detail Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200954F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 13, 2012 7 DATA SHEET • SKY65126-21 800-900 MHZ HIGH LINEARITY PA Figure 11. Layer Detail Physical Characteristics Application Circuit Notes Center Ground. It is extremely important to sufficiently ground the bottom ground pad of the device for both thermal and stability reasons. Multiple small vias are acceptable and will work well under the device if solder migration is an issue. GND (pins 1, 2, 3, 8, 10, 17, 19, and 20). Attach all ground pins to the RF ground plane with the largest diameter and lowest inductance via that the layout allows. Multiple small vias are acceptable and will work well under the device if solder migration is an issue. Figure 8) should be placed in the approximate location shown on the Evaluation Board, although exact placement is not critical. RF_IN (pin 16). Amplifier RF input pin (ZO = 50 Ω). The module includes an onboard internal DC blocking capacitor. All impedance matching is provided internal to the module. Package Dimensions N/C (pins 5, 14, 15, and 18). These pins are open and may or may not be connected to ground. The PCB layout footprint for the SKY65152-11 is shown in Figure 12. Typical case markings are shown in Figure 13. Package dimensions for the 20-pin MCM are shown in Figure 14, and tape and reel dimensions are provided in Figure 15. VC_BIAS (pin 4). The bias supply voltage for stages 1 and 2, typically set to +5 V. Package and Handling Information VREF1 (pin 6). Bias reference voltage for amplifier stage 1. This signal should be operated over the same voltage range as VCC with a nominal voltage of +5 V. VREF2 (pin 7). Bias reference voltage for amplifier stage 2. This signal should be operated over the same voltage range as VCC with a nominal voltage of +5 V. RF_OUT (pin 9). Amplifier RF output pin (ZO = 50 Ω). The module includes an onboard internal DC blocking capacitor. All impedance matching is provided internal to the module. VCC2 (pin 11). Supply voltage for the output (final) stage collector bias (typically +5 V). To bypass VCC2, capacitors C10, C11, and C12 (see Figure 8) should be placed in the approximate location shown on the Evaluation Board, although exact placement is not critical. VCC1 (pin 13). Supply voltage for the first stage collector bias (typically +5 V). To bypass VCC1, capacitors C6, C7, and C8 (see Since the device package is sensitive to moisture absorption, it is baked and vacuum packed before shipping. 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. The SKY65126-21 is rated to Moisture Sensitivity Level 3 (MSL3) at 250 °C. It can be used for lead or lead-free soldering. For additional information, refer to Skyworks Application Note, PCB Design and SMT Assembly/Rework Guidelines for MCM-L Packages, document number 101752. 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 8 February 13, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200954F DATA SHEET • SKY65126-21 800-900 MHZ HIGH LINEARITY PA Figure 12. SKY65126-21 PCB Layout Footprint Figure 13. SKY65126-21 Typical Case Markings Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200954F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 13, 2012 9 DATA SHEET • SKY65126-21 800-900 MHZ HIGH LINEARITY PA Figure 14. SKY65126-21 20-Pin MCM Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 February 13, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200954F DATA SHEET • SKY65126-21 800-900 MHZ HIGH LINEARITY PA Figure 15. SKY65126-21 20-Pin MCM Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 200954F • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • February 13, 2012 11 DATA SHEET • SKY65126-21 800-900 MHZ HIGH LINEARITY PA Ordering Information Model Name SKY65126-21 Power Amplifier Manufacturing Part Number SKY65126-21 Evaluation Board Part Number TW16-D190-001 Copyright © 2008, 2009, 2011, 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 12 February 13, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 200954F