PRELIMINARY DATA SHEET SKY65175: 1710-1950 MHz Variable Gain Amplifier Applications Description • WCDMA base stations Skyworks SKY65175 is a high linearity, Variable Gain Amplifier (VGA) module. The device includes an input Low-Noise Amplifier (LNA), a variable voltage attenuator, and an output Power Amplifier (PA). The two amplifiers and voltage attenuator are optimized for superior ACLR performance with WCDMA signals. • Femto cells Features The high linearity (high OP1dB, OIP3, and ACLR) and high efficiency of this device make it ideal for use at the final stage (or close to the final stage) of a WCDMA transmit chain. • Frequency range: 1710 to 1950 MHz • High gain: 26 dB • Attenuation range: 18 dB The output of the first PA (PA1) is matched to the input of the VCA. The output of the VCA is matched to the input of the second PA (PA2). The RF_IN and RF_OUT signals (pins 1 and 8, respectively) are both internally matched, including DC blocking capacitors. • OP1dB: +29 dBm • ACLR: –70 dBc for POUT = +12 dBm • Single DC supply: +5 V • Small MCM (12-pin, 8 x 8 mm) SMT package (MSL3, 260 °C per JEDEC J-STD-020) The SKY65175 VGA uses low-cost Surface Mount Technology (SMT) in the form of a compact, 8 x 8 mm 12-pin Multi-Chip Module (MCM), 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 1. SKY65175 Block Diagram Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201559B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 13, 2011 1 PRELIMINARY DATA SHEET • SKY65175 VGA Figure 2. SKY65175 Pinout – 12-Pin MCM (Top View) Table 1. SKY65175 Signal Descriptions Pin # Name Description Pin # Name Description 1 RF_IN RF input 7 GND Ground 2 GND Ground 8 RF_OUT RF output 3 VCTRL Variable attenuator control voltage 9 GND Ground 4 GND Ground 10 VCC_AMP2 Voltage supply for PA2 (after the variable voltage attenuator) 5 GND Ground 11 VCC_AMP1 Voltage supply for PA1 (before the variable voltage attenuator) 6 GND Ground 12 GND Ground Electrical and Mechanical Specifications The absolute maximum ratings of the SKY65175 are provided in Table 2. The recommended operating conditions are specified in Table 3 and electrical specifications are provided in Table 4. Typical performance characteristics of the SKY65175 are illustrated in Figures 3 through 6. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 2 October 13, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201559B PRELIMINARY DATA SHEET • SKY65175 VGA Table 2. SKY65175 Absolute Maximum Ratings Parameter Symbol Minimum Maximum Units Supply voltage VCC_AMP1, VCC_AMP2 5.5 V Control voltage VCTL 5.0 V RF output power (CW) POUT +29 dBm Thermal resistance ΘJC 38.6 °C/W Operating case temperature TC –40 +85 °C Storage case temperature TSTG –55 +125 °C Junction temperature TJ +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. 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. SKY65175 Recommended Operating Conditions Parameter Symbol Frequency range f RF output power POUT Supply voltage, measured at terminals of Evaluation Board VCC_AMP1, VCC_AMP2 Variable voltage attenuator control range VCTRL Ruggedness, load VSWR with no permanent damage PMAX_LOAD Operating case temperature TC Minimum Typical Maximum 1710 4.75 5.00 0 –30 Units 1950 MHz +25 dBm 5.25 V 2.8 V 10:1 – +85 °C Table 4. SKY65175 Electrical Specifications (Note 1) (VCC_AMP1 = VCC_AMP2 = 5 V, VCTRL = 0 V, TC = +25 °C, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted) Parameter Symbol Test Condition Frequency range f Small signal gain |S21| CW Gain control range G_RANGE CW, VCTL = 0.5 ≈ 2.8 V Output 1dB Compression Point OP1dB CW 3rd Order Output Intercept Point OIP3 PTONE = +12 dBm, Δf = 1 MHz ACLR for POUT = +12 dBm ACLR WCDMA, test mode 1, 64 channel single carrier Noise Figure NF @ maximum gain Input return loss |S11| Output return loss |S22| Operating current IOP POUT = +12 dBm Maximum VSWR for stable operation VSWR_MAX CW Min Typical 1710 Maximum linear output power 14 +12 Max Units 1950 MHz 26 dB 18 dB +29 dBm +13 dBm +41.5 dBm –70 dBc 2.8 3.2 10 9 dB dB 11 dB 294 mA 8:1 – Note 1: Performance is guaranteed only under the conditions listed in this Table. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201559B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 13, 2011 3 PRELIMINARY DATA SHEET • SKY65175 VGA Typical Performance Characteristics (VCC_AMP1 = VCC_AMP2 = 5 V, VCTRL = 0 V, TC = +25 °C, Characteristic Impedance [ZO] = 50 Ω, Unless Otherwise Noted) Figure 3. Gain vs Output Power Over Frequency Figure 4. ACLR vs Output Power Over Frequency Figure 5. Current vs Output Power Over Frequency Figure 6. Gain vs Control Voltage Over Frequency Evaluation Board Description The Skyworks SKY65175 Evaluation Board is used to test the performance of the SKY65175 VGA. An Evaluation Board schematic diagram is provided in Figure 7. An assembly drawing for the Evaluation Board is shown in Figure 8 and the layer detail is provided in Figure 9. The layer detail physical characteristics are noted in Figure 10. Capacitors C1, C2, and C3 provide DC bias decoupling and RF bypass for VCC_AMP1 (pin 11). Capacitors C4, C5, and C6 provide DC bias decoupling and RF bypass for VCC_AMP2 (pin 10). Capacitor C7 provides decoupling for VCTRL (pin 3). Pins 1 and 8 are the RF input and output signals, respectively. Pins 2, 4, 5, 6, 7, 9, 12, and the package backside metal are ground pins that provide the DC, RF, and thermal ground. Circuit Design Configurations The following design considerations are general in nature and must be followed regardless of final use or configuration. 1. Proper isolation must be provided between the VCC_AMP1 and VCC_AMP2 pins. 2. Paths to ground should be made as short as possible. 3. The ground pad of the SKY65175 VGA 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 amplifier. As such, design the connection to the ground pad to dissipate the maximum wattage produced to the circuit board. Multiple vias to the grounding layer are required. Filled or capped vias are recommended. 4. It is recommended that the layout for the VCC_AMP1 and VCC_AMP2 signals follow what is shown in Figure 8. The VCC_AMP1 and VCC_AMP2 traces can be tied together to share the same power supply. The connecting node should not be placed close to the package pins. The connecting node should be connected closer to components C1 and C4 (see Figure 7). This is to provide isolation between VCC_AMP1 and VCC_AMP2. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 4 October 13, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201559B PRELIMINARY DATA SHEET • SKY65175 VGA NOTE: Junction temperature (Tj) of the device increases with a poor connection to the slug and ground. This reduces the lifetime of the device. Testing Procedure Use the following procedure to set up the SKY65175 Evaluation Board for testing: 1. Connect a 5.0 V supply to the VCC_AMP1 and VCC_AMP2 pins. Connect the VCTRL signal to a power supply and set the power supply to 0 V. If available, enable the current limiting function of the power supply to 450 mA. 2. Connect a signal generator to the RF signal input port. Set it to the desired RF frequency at a power level of –20 dBm or less to the Evaluation Board but do NOT enable the RF signal. 3. Connect a spectrum analyzer to the RF signal output port. Package and Handling Information 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 SKY65175 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 & 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. 4. Enable the power supply. 5. Enable the RF signal. Package Dimensions 6. Take measurements. CAUTION: If any of the output signals exceed the rated maximum values, the SKY65175 Evaluation Board can be permanently damaged. The PDB footprint drawing for the SKY65175 is shown in Figure 11. Package dimensions for the 12-pin MCM are shown in Figure 12, and tape and reel dimensions are provided in Figure 13. Figure 7. SKY65175 Evaluation Board Schematic Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201559B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 13, 2011 5 PRELIMINARY DATA SHEET • SKY65175 VGA Figure 8. SKY65175 Evaluation Board Assembly Drawing Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 6 October 13, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201559B PRELIMINARY DATA SHEET • SKY65175 VGA Figure 9. SKY65175 Evaluation Board Layer Detail Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201559B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 13, 2011 7 PRELIMINARY DATA SHEET • SKY65175 VGA *** TBD *** Figure 10. Layer Detail Physical Characteristics Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 8 October 13, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201559B PRELIMINARY DATA SHEET • SKY65175 VGA Figure 11. SKY65175 PCB Layout Footprint Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201559B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 13, 2011 9 PRELIMINARY DATA SHEET • SKY65175 VGA Figure 12. SKY65175 12-Pin MCM Package Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 10 October 13, 2011 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • 201559B PRELIMINARY DATA SHEET • SKY65175 VGA *** TBD *** Figure 13. SKY65175 Tape and Reel Dimensions Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 201559B • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 13, 2011 11 PRELIMINARY DATA SHEET • SKY65175 VGA Ordering Information Model Name SKY65175 1710-1950 MHz Variable Gain Amplifier Manufacturing Part Number SKY65175 Evaluation Board Part Number TW19-D630 Copyright © 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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