MSM7731-02 OKI [OKI electronic componets], MSM7731-02 Datasheet - Page 31

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

(4) CR3 (Transmit Gain Adjustment)
B7, B6
B5, B4, B3, B2, B1, B0
1 Semiconductor
Initial Value
CR3
These bits adjust the transmit 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 TPAD4, 3, 2, 1 pins to a logic “0”.
Reserved bits.
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.
Transmit side level setting (TPAD)
TPAD6
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
TPAD5
B4
0
TPAD4
B3
0
TPAD3
B2
0
TPAD2
B1
0
FEDL7731-02-04
MSM7731-02
TPAD1
B0
0
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