MSM7731-02 OKI [OKI electronic componets], MSM7731-02 Datasheet - Page 30

• Manufacturer Part Number: MSM7731-02
• Description: Dual Echo Canceler & Noise Canceler with Dual Codec for Hands-Free
• Manufacturer: OKI [OKI electronic componets]

(3) CR2 (Receive side level control)
B7, B6
B5, B4, B3, B2, B1,B0
1 Semiconductor
Initial Value
CR2
Reserved bit.
These bits adjust the receive signal gain and set the mute level. Notice that only the mute level setting
differs from pin control. Because data is read by these bits in synchronization with the rising edge of the
SYNC signal, hold the data in these bits for 250 s or longer.
When using this register, set the TPAD, 3, 2, 1 pins to a logic “0”.
B7
—
0
(0, 0, 1, 0, 1, 0):
(0, 0, 1, 0, 0, 1):
(0, 0, 1, 0, 0, 0):
(0, 0, 0, 1, 1, 1):
(0, 0, 0, 1, 1, 0):
(0, 0, 0, 1, 0, 1):
(0, 0, 0, 1, 0, 0):
(0, 0, 0, 0, 1, 1):
(0, 0, 0, 0, 1, 0):
(0, 0, 0, 0, 0, 1):
(0, 0, 0, 0, 0, 0):
(1, 1, 1, 1, 1, 1):
(1, 1, 1, 1, 1, 0):
(1, 1, 1, 1, 0, 1):
(1, 1, 1, 1, 0, 0):
(1, 1, 1, 0, 1, 1):
(1, 1, 1, 0, 1, 0):
(1, 1, 1, 0, 0, 1):
(1, 1, 1, 0, 0, 0):
(1, 1, 0, 1, 1, 1):
(1, 1, 0, 1, 1, 0):
(1, 1, 0, 1, 0, 1):
(1, 1, 0, 1, 0, 0):
(1, 1, 0, 0, 1, 1):
(1, 1, 0, 0, 1, 0):
(1, 1, 0, 0, 0, 1):
(1, 1, 0, 0, 0, 0):
(1, 0, 1, 1, 1, 1):
(1, 0, 1, 1, 1, 0):
(1, 0, 1, 1, 0, 1):
(1, 0, 1, 1, 0, 0):
(1, 0, 1, 0, 1, 1):
B6
—
0
Modification of initial values is inhibited.
Receive side level setting (RPAD)
RPAD6
30 dB
27 dB
24 dB
21 dB
18 dB
15 dB
12 dB
9 dB
6 dB
3 dB
0 dB
–3 dB
–6 dB
–9 dB
–12 dB
–15 dB
–18 dB
–21 dB
–24 dB
–27 dB
–30 dB
–33 dB
–36 dB
–39 dB
–42 dB
–45 dB
–48 dB
–51 dB
–54 dB
–57 dB
–60 dB
MUTE
B5
0
RPAD5
B4
0
RPAD4
B3
0
RPAD3
B2
0
RPAD2
B1
0
FEDL7731-02-04
MSM7731-02
RPAD1
B0
0
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