msm7732 ETC-unknow, msm7732 Datasheet - Page 18

• Manufacturer Part Number: msm7732
• Description: Audio Codec
• Manufacturer: ETC-unknow

¡ Semiconductor
(3) CR2 (Transmit/receive gain adjustment)
B7 ................. Transmit side PCM signal ON/OFF
B6, B5, B4 .... Transmit side signal gain adjustment, refer to Table 2.
B3 ................. Receive side PCM signal ON/OFF
B2, B1, B0 .... Receive side signal gain adjustment, refer to Table 2.
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.
CR2
Initial Value
B6
0
0
0
0
1
1
1
1
DTMF tones (low group): ....................................... –16 dBm0
DTMF tones (high group) and other tones: ......... –14 dBm0
DTMF tones (low group): ....................................... –8 dBm0
DTMF tones (high group) and other tones: ......... –6 dBm0
B5
0
0
1
1
0
0
1
1
B4
0
1
0
1
0
1
0
1
ON/OFF
B7
TX
0
Transmit Side Gain
Table 2 Transmit/Receive Gain Settings
GAIN2
B6
TX
–6 dB
–4 dB
–2 dB
+2 dB
+4 dB
+6 dB
+8 dB
0
0 dB
GAIN1
B5
TX
1
GAIN0
B2
B4
0
0
0
0
1
1
1
1
TX
1
B1
0
0
1
1
0
0
1
1
ON/OFF
B3
RX
0
0/ON,
0/ON,
B0
0
1
0
1
0
1
0
1
GAIN2
B2
RX
0
Receive Side Gain
1/OFF
1/OFF
–12 dB
GAIN1
–9 dB
–6 dB
–3 dB
+3 dB
+6 dB
+9 dB
B1
RX
0 dB
1
MSM7732
GAIN0
B0
RX
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