EVALUATION BOARD DATA SHEET EV167 Evaluation Board for the AAT5101 2.5W Mono Filter-Free Class D Audio Power Amplifier Introduction The AAT5101 is a high efficiency mono filter-free Class D audio power amplifier with fully differential architecture and BTL (Bridge Tied Load) output. The AAT5101 evaluation board is provided for demonstration and evaluation of the AAT5101. The board contains one power decoupling capacitor, two input capacitors, and two input resistors in the 0603 package suitable for portable device applications. The PCB layout has been optimized to achieve high SNR and low THD+N with the 1.45mm x 1.45mm WCSP-9 package. The "Audio Demonstration" section of this document is intended to help the user to start the evaluation board for demonstration purposes. The "Amplifier Gain, THD+N, and Efficiency Evaluation” section explains procedures to measure amplifier gain, THD+N, and efficiency using the AAT5101 evaluation board. The AAT5101 evaluation board is shown in Figure 1; Figures 2 and 15 depict the AAT5101 evaluation board schematic and layout. For additional information, please consult the AAT5101 product datasheet. Board Picture a: Top Layer b: Bottom Layer Figure 1: AAT5101 Evaluation Board. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202287A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 1 EVALUATION BOARD DATA SHEET EV167 Evaluation Board for the AAT5101 2.5W Mono Filter-Free Class D Audio Power Amplifier Schematic and BOM VDD C3 C4 4.7µF GND U1 GND PVDD VDD IN+ VO - GND In+ GND InAudio In C1 0.1µF R1 150kΩ C2 0.1µF R2 150kΩ IN- VO+ J4 1 2 OutOut+ Audio Out SD AAT5101 J1 VDD 1 2 3 Shutdown Figure 2: AAT5101 Evaluation Board Schematic. Ref Part Description PCB Footprint U1 R1, R2 C1, C2 C4 C3 AAT5101 Class D Audio Amplifier SMD Resistor 150kΩ Ceramic Capacitor 0.1µF, 50V, X7R Ceramic Capacitor 4.7µF, 6.3V, X5R Not Populated WCSP-9 0603 0603 0603 Table 1: AAT5101 Evaluation Board Build of Materials (BOM). Audio Demonstration Demonstration Equipment 1. 2. 3. 4. Unit Under Test: AAT5101 Evaluation Board. Power Supply: DC Power Supply, Battery, USB or equivalent. Audio Source: Notebook, MP3, DVD Player or equivalent. Speaker: 8/4Ω Speaker. Set-up and Demonstration 1. Power supply is connected to J2. 2. Differential inputs are connected to IN+ and IN- of J3 as illustrated in Figure 3. If input is single-ended, ground one of two input pins of J3 by tying it to the center pin of J3 as illustrated in Figure 4. 3. Connect the speaker to J4. 4. Configure all connections as shown in Figures 3 and 4. 5. Make sure the signal source is set to minimum and the SHUTDOWN jumper is at OFF position, then turn on the power supply. 6. Set the SHUTDOWN jumper to the ON position to turn on the device. 7. Increase the input signal to your favorite volume. 2 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202287A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 EVALUATION BOARD DATA SHEET EV167 Evaluation Board for the AAT5101 2.5W Mono Filter-Free Class D Audio Power Amplifier DC Power Supply /Battery/USB etc. 2.1V to 5.5V Differential Audio Source G + Figure 3: AAT5101 Evaluation Board Demo Set-up for Differential Audio Input. DC Power Supply /Battery/USB etc. 2.1V to 5.5V Audio Source NB/MP3 etc. L G R Figure 4: AAT5101 Evaluation Board Demo Set-up for Single-Ended Audio Input. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202287A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 3 EVALUATION BOARD DATA SHEET EV167 Evaluation Board for the AAT5101 2.5W Mono Filter-Free Class D Audio Power Amplifier Amplifier Gain, THD+N, and Efficiency Evaluation Evaluation Equipment 1. 2. 3. 4. 5. AAT5101 Evaluation Board. Power Supply. Audio Analyzer. One Voltage Meter and Two Current Meters. 30kHz Low Pass Filter. A 30kHz RC low pass filter (100Ω, 47nF) is required on each output even if the analyzer has an internal low-pass filter. An RC low pass filter (1kΩ, 4.7nF) is required for efficiency measurement. Amplifier Gain and THD+N Measurement Amplifier Gain and THD+N Measurement Set-up 1. Connect the power supply to J2. 2. Differential inputs are connected to IN+ and IN- of J3 as shown in Figure 5. If input is single-ended, ground one of two input pins of J3 by tying it to the center pin of J3 as shown in Figure 6. 3. Connect a 5W power resistor load of 8/4Ω to OUT+ and OUT- of J4. 4. Connect the low pass filter to the resistor load. 5. The differential outputs of low pass filter are connected to audio analyzer AC IN+ and IN-. Power Supply 2.1V to 5.5V Audio Analyzer Part A GEN OUT GEN-F GEN-L RL 30 kHz LPF Audio Analyzer Part B AC IN THD+N &Voltage Figure 5: AAT5101 Amplifier Gain and THD+N Measurement Set-up for Differential Input. 4 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202287A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 EVALUATION BOARD DATA SHEET EV167 Evaluation Board for the AAT5101 2.5W Mono Filter-Free Class D Audio Power Amplifier Power Supply 2.1V to 5.5V RL Audio Analyzer Part A GEN OUT 30 kHz LPF Audio Analyzer Part B AC IN GEN-F GEN-L THD+N &Voltage Figure 6: AAT5101 Amplifier Gain and THD+N Measurement Set-up for Single-Ended Input. Amplifier Gain Measurement 1. Configure all connections as shown in Figures 5 and 6. 2. Make sure signal source is set to minimum and the SHUTDOWN jumper is in the OFF position, then turn on the power supply. 3. Set the SHUTDOWN jumper at the ON position to turn on the device. 4. Tune the input frequency to 1kHz, increase input amplitude to a middle point (output THD+N should be less than 1% at this point), measure input voltage (VIN) and output voltage (VOUT) by audio analyzer. Calculate the amplifier gain (G) using the following equation: G= VOUT 300kΩ = VIN RI Where RI =150kΩ is 1% standard metal film resistor connected to R1 and R2 of the board. THD+N vs. Output Power Measurement 1. Configure all connections as shown in Figures 5 and 6. 2. Make sure signal source is set to minimum and the SHUTDOWN jumper is at OFF position, then turn on the power supply. 3. Set the SHUTDOWN jumper at the ON position to turn on the device. 4. Tune the input frequency to 1kHz, increase input amplitude until output THD+N = 10%, measure output THD+N and output voltage (VOUT) by audio analyzer. Calculate the output power (POUT) using the following equation: POUT = (VOUT)2 RL Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202287A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 5 EVALUATION BOARD DATA SHEET EV167 Evaluation Board for the AAT5101 2.5W Mono Filter-Free Class D Audio Power Amplifier THD+N vs. Output Power THD+N vs. Output Power (f = 1kHz; RL = 8Ω) (f = 1kHz; RL = 4Ω) 10 VDD = 5.0V VDD = 3.6V VDD = 2.5V VDD = 2.1V THD+N (%) THD+N (%) 10 1 0.1 0.01 0.1 1 VDD = 5.0V VDD = 3.6V VDD = 2.5V VDD = 2.1V 1 0.1 0.01 10 0.1 Output Power (W) 1 10 Output Power (W) Figure 7: THD+N vs. Output Power @ RL = 8Ω. Figure 8: THD+N vs. Output Power @ RL = 4Ω. THD+N vs. Frequency Measurement 1. Configure all connections as shown in Figures 5 and 6. 2. Make sure the signal frequency is set to 20Hz and the SHUTDOWN jumper is in the OFF position, then turn on the power supply 3. Set the SHUTDOWN jumper to the ON position to turn on the device. 4. Increase frequency to 20kHz. Measure output THD+N vs. frequency. THD+N vs. Frequency THD+N vs. Frequency (CI = 2.2µF; RL = 8Ω) 1 0.1 0.01 10 10 VDD = 5V, POUT = 1W VDD = 3.6V, POUT = 500mW VDD = 2.5V, POUT = 200mW VDD = 2.1V, POUT = 150mW THD+N (%) THD+N (%) 10 (CI = 2.2µF; RL = 4Ω) 100 1000 10000 Frequency (Hz) 1 0.1 0.01 10 100000 Figure 9: THD+N vs. Frequency @ RL = 8Ω. VDD = 5.0V, POUT = 1.5W VDD = 3.6V, POUT = 800mW VDD = 2.5V, POUT = 300mW VDD = 2.1V, POUT = 200mW 100 1000 10000 100000 Frequency (Hz) Figure 10: THD+N vs. Frequency @ RL = 4Ω. Efficiency Measurement Efficiency Measurement Set-up 1. Connect the power supply to J2 through the current meter. 2. Connect the voltage meter to VDD and GND on the board. 3. Connect the differential inputs to IN+ and IN- of J3 as shown in Figure 11. If input is single-ended, ground one of two input pins of J3 by tying it the center pin of J3 as shown in Figure 12. 4. Connect a 5W power resistor of 8/4Ω and a 33µH inductor in series with the current meter as load to OUT+ and OUT- of J4. 5. Connect the low pass filter to the load. 6. The differential outputs of the low pass filter are connected to the audio analyzer AC IN+ and AC IN-. 6 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202287A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 EVALUATION BOARD DATA SHEET EV167 Evaluation Board for the AAT5101 2.5W Mono Filter-Free Class D Audio Power Amplifier Power Supply Current Meter 2.1V to 5.5V Voltage Meter Current Meter 30 kHz LPF Audio Analyzer Part A GEN OUT L AC IN RL GEN-F GEN-L Audio Analyzer Part B THD+N &Voltage Figure 11: AAT5101 Efficiency Measurement Set-up for Differential Input. Power Supply Current Meter 2.1V to 5.5V Voltage Meter Current Meter Audio Analyzer Part A GEN OUT GEN-F GEN-L 30 kHz LPF L RL Audio Analyzer Part B AC IN THD+N &Voltage Figure 12: AAT5101 Efficiency Measurement Set-up for Single-Ended Input. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202287A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 7 EVALUATION BOARD DATA SHEET EV167 Evaluation Board for the AAT5101 2.5W Mono Filter-Free Class D Audio Power Amplifier Efficiency vs. Output Power Measurement 1. Configure all connections as shown in Figures 11 and 12. 2. Make sure signal source is set to minimum and the SHUTDOWN jumper is at OFF position then turn on the power supply. 3. Set the SHUTDOWN jumper at the ON position to turn on the device. 4. Tune the input frequency to 1kHz, increase input amplitude until output THD+N = 10%, then measure the supply voltage (VS), supply current (IS), output voltage (VOUT) and output current (IOUT) to calculate the efficiency (η) by the following equation: η= VOUT · IOUT VS · IS Efficiency vs. Output Power Efficiency vs. Output Power 90 90 80 80 70 70 60 50 40 VDD = 5.0V VDD = 3.6V VDD = 2.5V VDD = 2.1V 30 20 10 0 8 (f = 1kHz; RL = 4Ω + 33µH) 100 Efficiency (%) Efficiency (%) (f = 1kHz; RL = 8Ω + 33µH) 0 0.3 0.6 0.9 1.2 60 50 40 30 VDD = 5.0V VDD = 3.6V VDD = 2.5V VDD = 2.1V 20 10 1.5 Output Power (W) Figure 13: Efficiency vs. Output Power @ RL = 8Ω + 33µF 0 0 0.5 1.0 1.5 2.0 2.5 Output Power (W) Figure 14: Efficiency vs. Output Power @ RL = 4Ω + 33µF Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202287A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 EVALUATION BOARD DATA SHEET EV167 Evaluation Board for the AAT5101 2.5W Mono Filter-Free Class D Audio Power Amplifier Evaluation Board PCB Layout a: Top Layer b: Ground Layer c: Power Layer d: Bottom Layer Figure 15: AAT5101 Evaluation Board PCB Layouts. Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202287A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012 9 EVALUATION BOARD DATA SHEET EV167 Evaluation Board for the AAT5101 2.5W Mono Filter-Free Class D Audio Power Amplifier Copyright © 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. Skyworks may change its documentation, products, services, specifications or product descriptions at any time, without notice. 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Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. 10 Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com 202287A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • August 23, 2012