IS31AP4912 STEREO HEADPHONE DRIVER EVALUATION BOARD GUIDE DESCRIPTION RECOMMENDED EQUIPMENT The IS31AP4912 is stereo headphone drivers 5.0V, 2A power supply designed to allow the removal of the output Audio source (i.e. MP3 player, Notebook PC, etc.) DC-blocking capacitors for reduced component count Headphone (32 ) and cost. The IS31AP4912 is ideal for small portable electronics where size and cost are critical design parameters. ABSOLUTE MAXIMUM RATINGS 5.5V power supply FEATURES Caution: Do not exceed the conditions listed above otherwise the board will be damaged. No output DC-blocking capacitors Supply voltage range from 2.7V to 5.5V PROCEDURE Low output noise (7V) The IS31AP4912 Evaluation board is fully assembled High SNR (103dB) and tested. Follow the steps listed below to verify -95dB PSRR board operation. Thermal protect circuit Caution: Do not turn on the power supply until all connections Integrated click-and-pop suppression circuitry are completed. UTQFN-12 (2mm 2mm) package 1) Connect headphone (32 ) to the connector (HP Jack). QUICK START 2) 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). 3) Connect the audio sources to the INR terminal (right channel) and INL terminal (left channel) or connect audio sources to the connector (AUDIO IN). 4) Turn on the power supply, and pay attention to the supply current. If the current exceeds 200mA, please check for circuit fault. 5) Turn on the audio sources. Figure 1: Photo of IS31AP4912 Evaluation Board ORDERING INFORMATION Part No. Temperature Range Package IS31AP4912-UTLS2-EB -40C to +85C (Industrial) UTQFN-12, Lead-free Table 1: Ordering Information For pricing, delivery, and ordering information, please contacts Lumissils analog marketing team at analog Lumissil.com or (408) 969-6600. Lumissil Microsystems www.lumissil.com 1 Rev. A, 01/10/2013 IS31AP4912 STEREO HEADPHONE DRIVER EVALUATION BOARD GUIDE GAIN SETTING HIGH PASS FILTER The input resistors R (R2, R3) and feedback resistors The input capacitors (C6, C7) and input resistors (R2, IN R (R1, R5) set the gain of the amplifier according to R3) form a high pass filter with the corner frequency, f , F C Equation (1). determined in Equation (2). 1 R V F (2) f Gain (1) c 2R C R V IN IN IN Note: Please refer to the datasheet to get more information SHUTDOWN MODE about IS31AP4912. Close Jumper (JP1) enter shutdown mode. Figure 2: IS31AP4912 Application Schematic Lumissil Microsystems www.lumissil.com 2 Rev. A, 01/10/2013