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MSM7502 PDF预览

MSM7502

更新时间： 2022-12-12 11:17:16
品牌 Logo 应用领域
冲电气 - OKI 解码器编解码器PC
页数 文件大小 规格书
35页 195K
描述
Multi-Function PCM CODEC

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MSM7502 数据手册

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¡ Semiconductor  
MSM7502  
RMI, RMO0, RMO1  
Receive main amplifier input and outputs.  
RMI is the inverted input and RMO0 and RMO1 are the outputs of the receive main amplifier.  
The output signal on RMO1 is inverted against RMO0 by a gain 1 (0 dB), so the earphone of a  
handset is directly connected between RMO0 and RMO1. During the system power down, the  
RMO0 and RMO1 outputs are in a high impedance state. The receive main amplifier gain is  
determined by a resistor connected between RPO and RMI, and a resistor connected between  
RMI and RMO0. The receive main amplifier gain varies between 0 and +20 dB in effect. A piezo-  
receiver with an impedance greater than 1.2 kW is available.  
If the adjusting of receive path frequency characteristics is required, insert the following circuit  
for adjustment. During the whole system Power ON, the speech path from RMI to RMO0 and  
RMO1 is disconnected and the output of RMO0 and RMO1 is at the SG level (VA/2). The speech  
path is provided by processor control.  
A circuit example for adjustment of frequency characteristics  
RPO  
RMI  
RMO0  
R1  
C1  
R2  
C2  
Main amplifier gain without capacitors  
R2  
R1  
G=  
5/35  
12345678...35

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