msm7732a Oki Semiconductor, msm7732a Datasheet - Page 19

• Manufacturer Part Number: msm7732a
• Description: Audio Codec
• Manufacturer: Oki Semiconductor

CR2 (PCM CODEC operating mode setting and transmit/receive gain adjustment)
B7
B6, B5, B4
B3
B2, B1, B0
The above gain settings table shows the transmit/receive voice signal gain settings and the transmit side gain
settings for DTMF tones and other tones. Tone signal transmission is enabled by CR4-B6, and the gain setting is
set to the levels shown below.
For example, if the transmit gain set value is set to +8 dB (B6, B5, B4) = (1, 1, 1), then the following tones appear
at the PCMOUT pin.
Gain setting for the side tone (path to the receive side from the transmit side) and the receive side tone is provided
by register CR3.
OKI Semiconductor
B6
0
0
0
0
1
1
1
1
Initial Value
CR2
B5
DTMF tones (low group):
DTMF tones (high group) and other tones: –14 dBm0
DTMF tones (low group):
DTMF tones (high group) and other tones: –6 dBm0
0
0
1
1
0
0
1
1
B4
0
1
0
1
0
1
0
1
ON/OFF
PCM coder disable; 0/Enable, 1/Disable (transmit PCM idle pattern)
Transmit gain adjustment, refer to Table 2.
PCM decoder disable; 0/Enable, 1/Disable (receive PCM idle pattern)
Receive gain adjustment, refer to Table 2.
TX
B7
0
Transmit Gain
GAIN2
B6
TX
+ 2 d B
+ 4 d B
+ 6 d B
+ 8 d B
–6 d B
–4 d B
–2 d B
0
0 d B
GAIN1
TX
B5
1
Table 2
–16 dBm0
–8 dBm0
GAIN0
B2
0
0
0
0
1
1
1
1
B4
TX
1
B1
0
0
1
1
0
0
1
1
ON/OFF
RX
B3
0
B0
0
1
0
1
0
1
0
1
GAIN2
RX
B2
0
Receive Gain
GAIN1
–1 2 d B
+ 3 d B
+ 6 d B
+ 9 d B
RX
B1
–9 d B
–6 d B
–3 d B
1
0 d B
FEDL7732A-01-01
MSM7732A-01
GAIN0
RX
B0
1
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