IS31AP4912 Stereo Headphone Driver Evaluation Board Guide Description Recommended Equipment The IS31AP4912 is stereo headphone drivers designed to allow the removal of the output DC-blocking capacitors for reduced component count and cost. The IS31AP4912 is ideal for small portable electronics where size and cost are critical design parameters. • • • Features • • • • • • • • Absolute Maximum Ratings • No output DC-blocking capacitors Supply voltage from 2.7V ~ 5.5V Low output noise (7µV) High SNR (103dB) -95dB PSRR Thermal protect circuit Integrated click-and-pop suppression circuitry UTQFN-12 (2mm × 2mm) package Quick Start 5.0V, 2A power supply Audio source (i.e. MP3 player, Notebook PC, etc.) Headphone (32Ω) ≤ 5.5V power supply Caution: Do not exceed the conditions listed above; otherwise the board will be damaged. Procedure The IS31AP4912 Evaluation 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) Connect headphone (32Ω) to the connector (HP JACK). 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 -40°C to +85°C (Industrial) UTQFN-12, Lead-free Table 1: Ordering Information For pricing, delivery, and ordering information, please contacts ISSI’s analog marketing team at [email protected] or (408) 969-6600 Integrated Silicon Solution, Inc. – www.issi.com RevA, 01/10/2013 1 IS31AP4912 Stereo Headphone Driver Evaluation Board Guide Gain Setting High Pass Filter The input resistors RIN (R2, R3) and feedback resistors RF (R1, R5) set the gain of the amplifier according to Equation (1). The input capacitors (C6, C7) and input resistors (R2, R3) form a high pass filter with the corner frequency, fC, determined in Equation (2). Gain = RF V RIN V 1 *Note: Please refer to the datasheet to get more information about IS31AP4912. Shutdown mode Close Jumper (JP1) enter shutdown mode. C2 6.8pF R1 20k TP1 VCC CON1 (2) f = c 2πR C IN IN (1) C3 VCC 1uF C1 10uF C4 0.1uF DC IN C5 2.2uF 3 INL 12 PVSS U1 PVDD TP5 INL C6 R2 0.47uF 20k 7 TP2 VCC CON2 AUDIO IN CP R4 JP1 100k 5 CN SDB CLOSE=SD INR IS31AP4912 PGND 2 OUTR 10 C9 2.2uF CON3 HP JACK 1 8 C8 2.2uF TP7 9 TP6 OUTR 11 TP3 INR SGND C7 R3 0.47uF 20k VREF 6 TP4 OUTL TP8 OUTL 4 R5 20k C10 6.8pF Figure 2: IS31AP4912 Application Schematic Integrated Silicon Solution, Inc. – www.issi.com RevA, 01/10/2013 2 IS31AP4912 Stereo Headphone Driver Evaluation Board Guide Bill of Materials Name Symbol Audio Amplifier U1 Resistors Description Qty Supplier Part No. Stereo Headphone Driver 1 ISSI IS31AP4912 R1,R2,R3,R5 RES,20k,1/16W,±5%,SMD 4 Resistor R4 RES,100k,1/16W,±5%,SMD 1 Capacitor C1 CAP,10µF,16V,±20%,SMD 1 Capacitors C2,C10 CAP, 6.8pF,16V,±20%,SMD 2 Capacitor C3 CAP,1µF,16V,±20%,SMD 1 Capacitor C4 CAP,0.1µF,16V,±20%,SMD 1 Capacitors C5,C8,C9 CAP,2.2µF,16V,±20%,SMD 3 Capacitors C6,C7 CAP,0.47µF,16V,±20%,SMD 2 Table 2: Bill of Materials, refer to Figure 2 above. Integrated Silicon Solution, Inc. – www.issi.com RevA, 01/10/2013 3 IS31AP4912 Stereo Headphone Driver Evaluation Board Guide 0 2 2 1 1 0 2 3 1 1 2 2 1 1 2 2 1 1 2 2 1 1 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 RevA, 01/10/2013 4 IS31AP4912 Stereo Headphone Driver Evaluation Board Guide 2 2 1 1 0 0 2 3 1 1 2 2 1 1 2 2 1 1 2 2 1 1 2 0 0 Figure 5: Board Component Placement Guide -Bottom Layer Figure 6: Board PCB Layout-Bottom Layer Integrated Silicon Solution, Inc. – www.issi.com RevA, 01/10/2013 5 IS31AP4912 Stereo Headphone Driver Evaluation Board Guide Copyright © 2013 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 RevA, 01/10/2013 6