NJW1200 Low-Voltage 2-channel Electronic Volume with ealaBASS !GENERAL DESCRIPTION The NJW1200 is a low-voltage 2-channel Electronic Volume with ealaBASS. It includes main volume, 2 stereo inputs selector (Differential Input), 2nd Order HPF. And It performs NJRC original dynamic bass boost technology “ealaBASS” provides graceful bass sound with low distortion. The NJW1200 performs low noise and low distortion characteristics with resistance ladder type electrical volume. The NJW1200 operates on low supply voltage. And It includes power save function. Therefore, it is suitable for low voltage supply portable systems. 2 All of internal status and variables are controlled by I C BUS interface. !PACKAGE OUTLINE NJW1200V !FEATURES ●Operating Voltage 2.7 to 5.5V ●Low Consumption 3mA typ. ●Power Save Function 120µA typ. ●I2C BUS Interface ●ealaBASS (Dynamic Bass Boost) ●eala (Surround Sound for stereo source) & eala MONO (Surround Sound for monaural source) ●Low Output Noise -100dBV typ. ●Low Distortion 0.07% typ. ●Main Volume 0 to –78dB / 2dB step, Mute ●2 stereo Inputs Selector (Differential Input) ●2nd Order HPF ●Bi-CMOS Technology ●Package Outline SSOP32 !BLOCK DIAGRAM SELOUTa EVROUTa OUTa AUX Control Differential Input stage IN1a SDA DIFFGND1 I2CBus Interface HPF SCL EVR IN1b eala/ ealaBass IN2a Bias DIFFGND2 HPF IN2b EVR Input selector SELOUTb EVROUTb OUTb –1– NJW1200 ! Application Circuit C25 4.7µF C1 4.7µF IN2a IN2a 1 R1 51kΩ IN1a C2 4.7µF DIFFGND2 DFFGND2 2 R2 51kΩ DIFFGND1 IN2b SELOUTa 4 SELOUTa C5 0.47µF C6 150nF 5 EVRINa 6 EVROUTa 7 HPF1a 8 HPF2a 9 HBSTa 10 ealaBass LPF1 11 ealaBass INT NJW1200 3 R8 12kΩ C7 150nF R9 39kΩ C8 1nF C9 470nF C10 1µF OUTa 12 OUTa IN1b 30 SELOUTb 29 EVRINb 28 EVROUTb 27 HPF1b 26 HPF2b 25 HBSTb 24 DIFFGND1 SELOUTb ealaBass LPF3 23 ealaBass LPF2 22 C20 150nF OUTb C27 10µF C18 1nF C17 82nF OUTb 21 C15 10nF 19 15 SCL VREF 18 16 GND V+ 17 SCL IN1b R10 39kΩ SURTC 14 R6 51kΩ C19 150nF SDA SDA C23 4.7µF R11 12kΩ 20 AUX R7 51kΩ C21 0.47µF eala Filter 13 C24 4.7µF 31 C3 4.7µF IN2b C26 10µF IN1a 32 C14 1µF C13 1µF V+ C12 1µF V pullup ( 1.5V to V +) Headphone OUTa 1 330 uF 2 0.22uF 10ohm 0.47uF 3 0.33 uF 4 VCC 5 22uF Headphone Driver (NJM2776) Power save Control 10 330uF Headphone OUTb 9 10ohm 0.22uF 8 0.47uF 7 6 22uF [CAUTION] The specifications on this databook are only given for information , without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. –2–