DATA SHEET SKY65135-31: 2.4-2.5 GHz WLAN Power Amplifier Applications Description • IEEE 802.11 b/g WLANs The SKY65135-31 is a Microwave Monolithic Integrated Circuit (MMIC) Power Amplifier (PA) with superior output power, linearity, and efficiency. These features make the SKY65135-31 ideal for Wireless Local Area Network (WLAN) applications. The high linearity (low EVM) and high efficiency of this device makes it ideal for use in the transmit chain of WLAN access points or modems. • ISM band transmitters • WCS fixed wireless • Wireless access nodes Features • EVM < 2.8% for POUT > +27 dBm • High gain = 31 dB • Internal RF match with DC block and active bias circuits • Single DC supply = +5 V • Operating temperature = –40 °C to +85 °C • Small, MCM (20-pin, 6 x 6 mm) package (MSL3, 260 °C per JEDEC J-STD-020) Figure 1. SKY65135-31 Block Diagram The SKY65135-31 is fabricated using Skyworks high reliability Heterojunction Bipolar Transistor (HBT) InGaP process, which allows for single supply operation while maintaining high efficiency and good linearity. The device is internally matched and mounted in a 20-pin, 6 x 6 mm Multi-Chip Module (MCM) Surface-Mounted Technology (SMT) package, which allows for a highly manufacturable low cost solution. 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. SKY65135-31 Pinout – 20-Pin MCM (Top View) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201000E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 16, 2012 1 DATA SHEET • SKY65135-31 POWER AMPLIFIER Table 1. SKY65135-31 Signal Descriptions Pin # 1 GND 2 3 Description Pin # Name Description Ground 11 VCC3 Stage 3 collector voltage GND Ground 12 N/C No connection N/C No connection 13 VCC2 Stage 2 collector voltage 4 VC_BIAS Bias voltage 14 V_DET Detector output signal 5 VREF1 Bias reference voltage 1 15 VCC_DET Detector supply voltage 6 VREF2 Bias reference voltage 2 16 VCC1 Stage 1 collector voltage 7 VREF3 Bias reference voltage 3 17 GND Ground 8 GND Ground 18 RF_IN RF input 9 RF_OUT RF output 19 GND Ground GND Ground 20 GND Ground 10 Note: Name The center attachment pad must have a low inductance and low thermal resistance connection to the printed circuit board ground plane. Functional Description The SKY65135-31 is a three-stage, HBT InGaP device optimized for high linearity and power efficiency. It contains all of the needed RF matching and DC biasing circuits. An in-module active bias circuit is included within the device for all three amplifier stages, which provides excellent gain tracking over temperature and voltage variations. The first, second, and third output stages are independently supplied using the VCC1, VCC2, and VCC3 signals (pins 16, 13 and 11,respectively). The DC control voltage that sets the bias for all three stages is supplied by the VC_BIAS signal (pin 4). The Evaluation Board includes shunt decoupling capacitors on these pins to suppress any possible bias affect on the RF signal at low frequencies. The bias reference voltages for stages 1, 2, and 3 are supplied using the common lines VREF1, VREF2, and VREF3 (pins 5, 6, and 7, respectively). The maximum voltage for these pins is 4 V. Resistors R1, R2, and R3 on the Evaluation Board set the correct bias to these pins when attached to a 5 V power supply. The SKY65135-31 includes an output power detector voltage, V_DET, at pin 14. A bias voltage is required to operate the detector. The detector supply voltage is provided through the VCC_DET signal (pin 15). The maximum voltage for this pin is 4 V. Resistor R5 on the Evaluation Board sets the correct bias to this pin when attached to a 5 V power supply. Pin 18 is the RF input and Pin 9 is the RF output. External DC blocking or RF matching is not required on the RF input and output. Grounding is through several ground pins and the package center ground. These features make the device suitable for wideband digital applications where PA linearity and power consumption are of critical importance (e.g., WLANs). The device has been characterized with the highest specified data rates for 802.11b (11 Mbps) and 802.11g (54 Mbps). Under these stringent test conditions, the device exhibits excellent spectral purity and power efficiency. Electrical and Mechanical Specifications The absolute maximum ratings of the SKY65135-31 are provided in Table 2. The recommended operating conditions are specified in Table 3 and electrical specifications are provided in Table 4. Performance characteristics for the SKY65135-31 are illustrated in Figures 3 through 17. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 October 16, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201000E DATA SHEET • SKY65135-31 POWER AMPLIFIER Table 2. SKY65135-31 Absolute Maximum Ratings (Note 1) Parameter Symbol RF output power Minimum POUT Maximum Units +28 dBm Supply voltage (VCC, VC_BIAS) (Note 2) VCC 5.5 V Total supply current ICC 850 mA Reference voltage (Note 2) VREF 4 V 4 V Power dissipation PD 3.3 W Case temperature TC –40 +85 °C Storage temperature TSTG –55 +125 °C Junction temperature TJ +150 °C Thermal resistance ΘJC 20 °C/W Detector supply voltage (VCC_DET) (Note 2) 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. Note 2: Voltage levels measured at the pins of the package. The Evaluation Board supply voltage levels may be different. Refer to the Evaluation Board schematic diagram in this document. 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. SKY65135-31 Recommended Operating Conditions Parameter Symbol Minimum Typical Maximum +27 Units RF output power POUT Supply voltage (Note 1) VCC, VC_BIAS Reference voltage (Note 1) VREF 2.5 V Detector supply voltage (Note 1) VCC_DET 3.6 V Operating frequency f 2412 Case temperature TC –40 4.5 5.0 +25 dBm 5.5 V 2462 MHz +85 °C Note 1: Voltage levels measured at the pins of the package. The Evaluation Board supply voltage levels may be different. Refer to the Evaluation Board schematic diagram in this document. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201000E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 16, 2012 3 DATA SHEET • SKY65135-31 POWER AMPLIFIER Table 4. SKY65135-31 Electrical Specifications (Note 1) (Note 2) (VCC1 = VCC2 = VCC3 = VREF1 = VREF2 = VREF3 = VC_BIAS = VCC_DET = 5 V, Characteristic Impedance [ZO] = 50 Ω, TC = 25 °C, Frequency = 2.442 GHz, Unless Otherwise Noted) Parameter Symbol Test Condition Min Typical Max Units IEEE 802.11g Orthogonal Frequency Division Multiplexing Input Signal, Data Rate = 54 Mbps Maximum transmit power Error Vector Magnitude +27 EVM @ POUT = +27 dBm |S21| PIN = –25 dBm 2.0 dBm 2.8 % Continuous Wave Input Signal Small signal gain Gain flatness 31 2.4 GHz to 2.5 GHz Input return loss |S11| Output power @ 1 dB compression OP1dB 32 dB 1.0 1.4 dB –10 –8 dB +31.5 +32.5 410 465 dBm Quiescent current ICCQ No RF input Operational current ICC_OP POUT = +27 dBm 500 mA 820 mA Noise Figure NF Detector voltage VDET POUT = +27 dBm 0.80 0.95 V 2nd harmonics 2fo CW input –26 –22 dBm 3rd harmonics 3fo CW input –33 –30 dBm 5 0.75 dB Note 1: Performance is guaranteed only under the conditions listed in this Table. Note 2: Voltage measured at Evaluation Board pins. Typical Performance Characteristics (VCC1 = VCC2 = VCC3 = VREF1 = VREF2 = VREF3 = VC_BIAS = VCC_DET = 5 V, CW, Characteristic Impedance [ZO] = 50 Ω, TC = 25 °C, Frequency = 2.442 GHz, Unless Otherwise Noted) Figure 3. Gain vs Output Power Over Frequency Figure 4. Gain vs Output Power Over Voltage Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 October 16, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201000E DATA SHEET • SKY65135-31 POWER AMPLIFIER Figure 5. Small Signal Gain vs Frequency Over Temperature @5V Figure 6. Small Signal Gain vs Frequency Over VCC @ 25 °C Figure 7. EVM vs Output Power Over Frequency Figure 8. Current vs Output Power Figure 9. Quiescent Current vs VCC Over Temperature Figure 10. Current vs Output Power Over Temperature @ 5 V Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201000E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 16, 2012 5 DATA SHEET • SKY65135-31 POWER AMPLIFIER Figure 11. Supply Current vs Output Power Over Frequency Figure 12. Supply Current vs Output Power Over VCC Figure 13. Detector Voltage vs Output Power Over Frequency Figure 14. Detector Voltage vs Output Power Over VCC Figure 15. Spectral Response @ POUT = +30 dBm (802.11g, OFDM, 64 QAM @ 54 Mbps) Figure 16. Spectral Response @ POUT = +31 dBm (802.11b, CCK @ 11 Mbps) Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 October 16, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201000E DATA SHEET • SKY65135-31 POWER AMPLIFIER Figure 17. Second Harmonic vs Output Power (802.11b) Evaluation Board Description The SKY65135-31 Evaluation Board is used to test the performance of the SKY65135-31 PA. An Evaluation Board schematic diagram is provided in Figure 18. An assembly drawing for the Evaluation Board is shown in Figure 19. An Evaluation Board layer detail drawing is shown in Figure 20. Layer detail physical characteristics are noted in Figure 21. Table 5 provides the Bill of Materials (BOM) list for Evaluation Board components. 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 a +5 V supply to the VCC1, VCC2, VCC3, VREF1, VREF2, VREF3, VC_BIAS, and VCC_DET pins. If available, enable the current limiting function of the power supply to 850 mA. Circuit Design Considerations Step 2: If desired, connect a voltage meter to the V_DET pin. The following design considerations are general in nature and must be followed regardless of final use or configuration: Step 3: Connect a signal generator to the RF signal input port. Set it to the desired RF frequency at a power level of –15 dBm or less to the Evaluation Board. DO NOT enable the RF signal. 1. Paths to ground should be made as short as possible. 2. The ground pad of the SKY65135-31 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. 3. Bypass capacitors should be used on the DC supply lines. An RF inductor is required on the VCC supply line to block RF signals from the DC supply. Refer to the schematic drawing in Figure 18 for further details. 4. The RF lines should be well separated from each other with solid ground in between traces to maximize input-to-output isolation. Step 4: Connect a spectrum analyzer to the RF signal output port. Step 5: Enable the power supply. Step 6: Enable the RF signal. Step 7: Take measurements. CAUTION: If the input signal exceeds the rated power, the SKY65135-31 Evaluation Board can be permanently damaged. NOTE: It is important to adjust the VCC voltage source so that +5 V is measured at the board. The high collector currents will drop the collector voltage significantly if long leads are used. Adjust the bias voltage to compensate. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201000E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 16, 2012 7 DATA SHEET • SKY65135-31 POWER AMPLIFIER Figure 18. SKY65135-31 Evaluation Board Schematic Figure 19. SKY65135-31 Evaluation Board Assembly Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 October 16, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201000E DATA SHEET • SKY65135-31 POWER AMPLIFIER Figure 20. SKY65135-31 Evaluation Board Layer Detail Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201000E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 16, 2012 9 DATA SHEET • SKY65135-31 POWER AMPLIFIER Figure 21. Evaluation Board Layer Detail Physical Characteristics Table 5. SKY65135-31 Evaluation Board Bill of Materials Component Value Size Product # Manufacturer Manufacturer’s Part # Characteristics C1, C2, C6 3300 pF 0603 5404R28-015 Murata GRM188R71H332KD01J C5, C7, C8, C10 8.2 pF 0603 5404R98-010 Murata GRM1885C1H8R2CZ01D C0G, 50 V, ±0.25 pF C11, C15, C16, C17 10 μF 0603 5404R91-005 TDK C3216X5R0J106KT X5R, 6 V, ±10% L2 27 nH 0603 5332R34-030 Taiyo-Yuden HK160827NJ-T ±5%, SRF 3400 MHz R1 680 Ω 0603 5424R20-045 Rohm MCR03EZHUJ680 50 V, 0.063 W, ±5% R2, R3 200 Ω 0603 5424R20-032 Rohm MCR03EZHUJ200 50 V, 0.063 W, ±5% R5 300 Ω 0603 5424R20-036 Rohm MCR03EZHUJ300 50 V, 0.063 W, ±5% 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, 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. N/C (pins 3 and 12). These pins are open and may or may not be connected to ground. VC_BIAS (pin 4). The bias supply voltage for stages 1 and 2, typically set to +5 V. VREF1 (pin 5). 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 6). 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. VREF3 (pin 7). Bias reference voltage for amplifier stage 3. This signal should be operated over the same voltage range as VCC with a nominal voltage of +5 V. X7R, 50 V, ±10% 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. VCC3 (pin 11). Supply voltage for the output (final) stage collector bias (typically +5 V). To bypass VCC3, capacitors C10 and C17 (see Figure 15) should be placed in the approximate location shown on the Evaluation Board, although exact placement is not critical. VCC2 (pin 13). Supply voltage for the second stage collector bias (typically +5 V). To bypass VCC2, capacitors C8 and C16 (see Figure 15) should be placed in the approximate location shown on the Evaluation Board, although exact placement is not critical. V_DET (pin 14). The output power detector voltage signal. The detector load and settling time constant are set external to the device. Inductor L2 and capacitor C7 (see Figure 18) are set to yield a settling time of < 0.5 μs. VCC_DET (pin 15). The power detector supply voltage signal. Resistor R5 and capacitor C5 (see Figure 18) are used for proper bias and bypassing of this pin. VCC1 (pin 16). Supply voltage for the first stage collector bias (typically +5 V). To bypass VCC1, capacitors C5 and C15 (see Figure 15) should be placed in the approximate location shown on the Evaluation Board, although exact placement is not critical. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 October 16, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201000E DATA SHEET • SKY65135-31 POWER AMPLIFIER RF_IN (pin 18). 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 The PCB layout footprint for the SKY65135-31 is shown in Figure 22. Typical case markings are shown in Figure 23. Package dimensions for the 20-pin MCM are shown in Figure 24, and tape and reel dimensions are provided in Figure 25. Package and Handling Information 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 SKY65135-31 is rated to Moisture Sensitivity Level 3 (MSL3) at 260 °C. It can be used for lead or lead-free soldering. For additional information, refer to the 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. 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 Figure 22. SKY65135-31 PCB Layout Footprint Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201000E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 16, 2012 11 DATA SHEET • SKY65135-31 POWER AMPLIFIER Figure 23. SKY65135-31 Typical Case Markings Figure 24. SKY65135-31 20-Pin MCM Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 12 October 16, 2012 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201000E DATA SHEET • SKY65135-31 POWER AMPLIFIER Figure 25. SKY65135-31 20-Pin MCM Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201000E • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 16, 2012 13 DATA SHEET • SKY65135-31 POWER AMPLIFIER Ordering Information Model Name SKY65135-31 WLAN Power Amplifier Manufacturing Part Number SKY65135-31 Evaluation Board Part Number TW16-D280-031 Copyright © 2009, 2010, 2012 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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