參數(shù)資料
型號(hào)： MSM7603
廠商： OKI SEMICONDUCTOR CO., LTD.
英文描述： Echo Canceler
中文描述： 回聲消除器
文件頁(yè)數(shù)： 6/20頁(yè)
文件大小： 149K
代理商： MSM7603
Semiconductor
MSM7603/7603B
6/20
PIN DESCRIPTIONS (Continued)
Pin
17
Symbol
GC
Type
I
Description
26
ROUT
O
27
SOUT
O
25
SIN
I
24
RIN
I
18
SCKO
O
19
ATT
I
This is the pin for the input signal by which the gain controller
for the RIN input is controlled. The pin also controls RIN input
level and prevents howling.
The gain controller adjusts the RIN input level when it is –20
dBm0 or above. RIN input levels from –20 to –11.5 dBm0 will be
suppressed to –20 dBm0 in the attenuation range from 0 to 8.5 dB.
RIN input levels above –11.5 dBm0 will always be attenuated by
8.5 dB.
"H": Gain control ON
"L": Gain control OFF
"H" is recommended for performing echo cancellation.
This is the output pin for the transmit clock signal (256 kHz) for
the PCM codec.
Connect to the SCK pin and the PCM codec transmit/receive clock
pin.
Leave open when using an external SCK.
This is the control pin for the ATT function which prevents howling
by attenuators (ATT) for the RIN input and SOUT output.
If there is input only to RIN, then the ATT for the SOUT output is
activated.
If there is no input to SIN or there is input to both SIN and RIN,
then the ATT for the RIN input is activated.
Either the ATT for the RIN output or the ATT for the SOUT is
always activated in all cases, and the attenuation of ATT is 6 dB.
"H": ATT OFF
"L": ATT ON
"L" is recommended for performing echo cancellation.
This is the receive serial data input pin.
Input the PCM signal synchronized to SYNC and SCK.
Data is read at the falling edge of SCK.
This is the transmit serial data input pin.
Input the PCM signal synchronized to SYNC and SCK.
Data is read at the falling edge of SCK.
This is the output pin for receive serial data.
Outputs the PCM signal synchronized to SYNC and SCK.
This pin is in high impedance state during the absence of data output.
This is the output pin for transmit serial data.
Outputs the PCM signal synchronized to SYNC and SCK.
This pin is in high impedance state during the absence of data output.
21
(TEST)
O
This pin is for MSM7603B only and not used. Should be left open.
In MSM7603 it is an NC pin.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MSM7603B 制造商:OKI 制造商全稱:OKI electronic componets 功能描述:Echo Canceler
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