msm7603 Oki Semiconductor, msm7603 Datasheet - Page 6

• Manufacturer Part Number: msm7603
• Description: Echo Canceler
• Manufacturer: Oki Semiconductor

¡ Semiconductor
PIN DESCRIPTIONS (Continued)
Pin
17
18
19
21
24
25
26
27
Symbol
(TEST)
SCKO
ROUT
SOUT
ATT
RIN
SIN
GC
Type
O
O
O
O
I
I
I
I
This pin is for MSM7603B only and not used. Should be left open.
In MSM7603 it is an NC pin.
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 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" is recommended for performing echo cancellation.
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.
"L" is recommended for performing echo cancellation.
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.
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.
"H": Gain control ON
"L": Gain control OFF
"H": ATT OFF
"L": ATT ON
Description
MSM7603/7603B
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