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BH7881EFV Datasheet(PDF) 3 Page - Rohm |
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BH7881EFV Datasheet(HTML) 3 Page - Rohm |
3 / 10 page Technical Note 3/9 www.rohm.com 2010.06 - Rev.A © 2010 ROHM Co., Ltd. All rights reserved. BH7881EFV ● Block diagram Fig.1 ● Control pin descriptions 1. ACTIVE/SUSPEND:2PIN Control input Mode Function H SUSPEND Suspended state (Except REG) L ACTIVE Active state When suspended, the regulator (REG) is in an active state and the SP/HP/LINE amplifier is in a suspended state. Originally, signals from input resistance and feedback resistance leaked into the speaker output even when suspended, because of the series connection of an inverting amplifier. However, since the signals are cut off on their way in this IC, signal leaks do not occur in speaker output. (Signals due to feedback resistance are output in LINE amplifier output.) 2. POWER LEVEL:8PIN Control input Mode Function H Limiter H 3Vf peak limiter ON (Output approx. 1.25 W) OPEN Limiter L 2Vf peak limiter ON(Output approx .0.70W) L Limiter OFF limiter OFF *VCC=5V,RL=4ohm,VIN=-8dBV Since a limiter uses diode characteristics, it has temperature characteristics. On the high temperature side, amplitude tends to decrease, which is a characteristic that protects the IC. Since setting in speaker mode is assumed, it is ineffective (limiter OFF) in headphone mode. Moreover, precautions must be taken when input is so great, that output becomes a square wave, since this could cause local oscillation. 3. BASSBOOST ON/OFF:11PIN Control input Mode Function H ON BASSBOOST:ON L OFF BASSBOOST:OFF The capacitor that constitutes BASSBOOST is eliminated, and also functions as a gain switch. 4. SP/HP:12PIN Control input Mode Function H SP+HP SP:ON, HP:ON L HP SP:OFF,HP:ON By using the headphone mode in a speaker MUTE mode, it is possible to completely cut off the pop noise when switching when VCC ON or OFF, or to ACTV or SPND. For control sequence and other information, see the following pages. *Not all control pins have pull up or pull internal resistors. Therefore add pull up or pull down resistors, accordingly (PIN8 is an exception.) |
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