IS31AP2031 CLASS-G AUDIO POWER AMPLIFIER EVALUATION BOARD GUIDE DESCRIPTION RECOMMENDED EQUIPMENT The IS31AP2031 is a Class-G audio power amplifier with automatic gain control. It drives up to 2.0W (10% THD+N) into an 8Ω speaker from a 4.2V VCC supply. The IS31AP2031 provides low cost, space saving solution for portable equipments which need audio output with higher power by boosting up supply voltage. Its external components just include a few capacitors and resistors (no inductor). The IS31AP2031 use fully differential design to reduce RF noise. The IS31AP2031 integrates de-pop circuitry to reduce pop and click noise during power on/off or shutdown enable operation. The IS31AP2031 also integrates thermal and short circuit protection function. FEATURES Operates from 2.7V to 4.5V 2.0W into an 8Ω load from a 4.2V supply (10% THD+N) 4 gain levels: 12dB, 16dB, 24dB, 27.5dB AGC function Pulse Count Control serial interface 8kV HBM ESD Thermal and short-circuit protection Available in QFN-20 (3mm × 3mm). QUICK START ≤ 4.5V, 2A power supply Audio source (i.e. MP3 player, Notebook PC, etc.) An 8Ω speaker ABSOLUTE MAXIMUM RATINGS ≤ 4.5V power supply Caution: Do not exceed the conditions listed above; otherwise the board will be damaged PROCEDURE The IS31AP2031 demo board is fully assembled and tested. Follow the steps listed below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1) 2) 3) 4) 5) 6) Connect an 8Ω (or larger) speaker across the OUT- terminal and OUT+ terminal. Connect the ground terminal of the power supply to the GND and the positive terminal to the VCC. Or connect DC power to connector (DC IN). If the audio source is differential, remove jumper JP1, connect the negative of the audio source to the IN- terminal, and connect the positive of the audio source to IN+ terminal. If the audio source is single-ended, connect the audio source to the IN- terminal, and close jumper JP1; or connect audio source to the audio connector (AUDIO IN) and close jumper JP1. Turn on the power supply, and pay attention to the supply current. If the current exceeds 1.5A, please check for circuit fault. Turn on the audio source. Figure 1: Photo of IS31AP2031 Evaluation Board ORDERING INFORMATION Part No. Temperature Range Package IS31AP2031-QFLS2-EB -40°C to +85°C (Industrial) QFN-20, Lead-free Table 1: Ordering Information For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at [email protected] or (408) 969-660. Integrated Silicon Solution, Inc. – www.issi.com Rev. B, 12/31/2014 1 IS31AP2031 CLASS-G AUDIO POWER AMPLIFIER EVALUATION BOARD GUIDE PERFORMANCE DESCRIPTION SOFTWARE SUPPORT The IS31AP2031 evaluation board has four buttons to switch between the different modes. The operating mode is indicated by an LED illuminated above the appropriate buttons. The modes listed as below: Please refer to the integrated program. 1) 2) 3) 4) 5) Note: The Jumper JP3 is closed by default, if the JP3 is open, the MCU will stop functioning, the SDB pin of the chip in a high impedance state. The external MCU can be used to control the board SD (TP7) point. Mode1: gain level 12dB AGC OFF. Mode2: gain level 16dB AGC ON. Mode3: gain level 24dB AGC OFF. Mode4: gain level 27.5dB: AGC ON. Shutdown mode: close Jumper (JP2) enter shutdown mode. Please refer to the datasheet to get more information about IS31AP2031. Note: IS31AP2031 Audio Amplifier provides solely the Audio function on the evaluation board. U1 U2 VCC 3V 1 3 C8 1uF 2 VDD VOUT 4,8 C9 10nF SD GND BP VCC 5 C10 1uF C2 1uF 4 VDD C7 0.1uF JP2 CLOSE=SD SDB 1 TP7 LDO SDB CP CN C3 15nF R1 10K 6 IN+ C4 15nF R2 10K 7 9 JP1 CLOSE=SE TP1 CON1 DC IN VCC 19 C5 4.7uF TP5 IN- TP4 C6 10uF 3 SD TP3 CON2 AUDIO IN 12,17,18 AVIN R3 100K IN- OUT+ IN+ OUT- FS GND 15 OUT+ CON3 SPK 13 OUT14,20 TP6 Speaker IS31AP2031 C1 10uF LED1 1 LED2 2 RST 4 VCC R10 100K 27.5dB AGC ON 24dB AGC OFF 3V U3 TP2 R11 100K R12 100K P0.0 P1.7 RST 3 K3 P0.1 P0.2 R13 100K K4 VDD 8 16dB AGC ON K2 9 12dB AGC OFF K1 10 6 7 5 P0.3 P1.6 P0.4 INT1/P1.4 P0.5 INT0/P1.3 P0.6 15 T1/P0.7 TXD/P1.0 RXD/P1.1 R6 1K D4 LED3 R7 1K D3 LED2 R8 1K D2 LED1 R9 1K D1 20 LED4 3V 19 LED3 18 JP3 OPEN=EXT CTRL 17 P0.4 16 P0.5 14 SDB T0/P1.2 OSC1 OSC2 GND LED4 13 12 11 R4 NC R5 100K LPC922 VCC TP8 3V P0.5 P0.4 RST GND 5 4 3 2 1 ICP Figure 2: IS31AP2031 Application Schematic Integrated Silicon Solution, Inc. – www.issi.com Rev. B, 12/31/2014 2 IS31AP2031 CLASS-G AUDIO POWER AMPLIFIER EVALUATION BOARD GUIDE BILL OF MATERIALS Name Symbol Audio Amplifier U1 LDO Qty Supplier Part No. Class-G Audio Amplifier 1 ISSI IS31AP2031 U2 Low-dropout Regulator 1 PAM PAM3101 MCU U3 Microcontroller 1 NXP LPC922 Diode D1~D4 Diode, LED Blue, SMD 4 Resistor R1,R2 RES,10k,1/16W,±1%,SMD 2 Yageo RC0603FR-0710KRL 6 Yageo RC0603JR-07100KRL RES,1k,1/16W,±5%,SMD 4 Yageo RC0603JR-0701KRL Not Connected 1 Resistor Description R3,R5,R10~R13 RES,100k,1/16W,±5%,SMD Everlight 19-217/BHC-ZL1M2RY/3T Resistor R6~R9 Resistor R4 Capacitor C1,C6 CAP,10µF,10V,±10%,SMD 2 Yageo CC0805KKX7R6BB106 Capacitor C2 CAP, 1µF,16V,±10%,SMD 1 Yageo CC0603KKX7R7BB105 Capacitor C8,C10 CAP, 1µF,16V,±10%,SMD 2 Yageo CC0805KKX7R7BB105 Capacitor C3,C4 CAP, 15nF,16V,±10%,SMD 2 Yageo CC0603KKX7R7BB153 Capacitor C5 CAP, 4.7µF,10V,±10%,SMD 1 Yageo CC0805KKX7R6BB475 Capacitor C7 CAP, 0.1µF,16V,±10%,SMD 1 Yageo CC0603KKX7R7BB104 Capacitor C9 CAP,10nF,16V,±10%,SMD 1 Yageo CC0603KKX7R7BB103 Button K1~K4 Button SMD 4 Bill of Materials, refer to Figure 2 above. Integrated Silicon Solution, Inc. – www.issi.com Rev. B, 12/31/2014 3 IS31AP2031 CLASS-G AUDIO POWER AMPLIFIER EVALUATION BOARD GUIDE 0 0 2 2 1 2 1 2 1 2 2 1 2 1 2 1 2 2 1 2 1 1 1 2 2 2 0 0 Figure 3: Board Component Placement Guide - Top Layer Figure 4: Board PCB Layout - Top Layer Integrated Silicon Solution, Inc. – www.issi.com Rev. B, 12/31/2014 4 IS31AP2031 CLASS-G AUDIO POWER AMPLIFIER EVALUATION BOARD GUIDE 0 0 2 2 1 2 1 2 1 2 2 1 2 1 2 1 2 2 1 2 1 1 1 2 2 2 0 0 Figure 5: Board Component Placement Guide - Bottom Layer Figure 6: Board PCB Layout - Bottom Layer Copyright © 2014 Integrated Silicon Solution, Inc. All rights reserved. ISSI reserves the right to make changes to this specification and its products at any time without notice. ISSI assumes no liability arising out of the application or use of any information, products or services described herein. Customers are advised to obtain the latest version of this device specification before relying on any published information and before placing orders for products. Integrated Silicon Solution, Inc. does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless Integrated Silicon Solution, Inc. receives written assurance to its satisfaction, that: a.) the risk of injury or damage has been minimized; b.) the user assume all such risks; and c.) potential liability of Integrated Silicon Solution, Inc is adequately protected under the circumstances Integrated Silicon Solution, Inc. – www.issi.com Rev. B, 12/31/2014 5