ml7041 Oki Semiconductor, ml7041 Datasheet - Page 21

• Manufacturer Part Number: ml7041
• Description: Audio Codec
• Manufacturer: Oki Semiconductor

CR2 (PCM CODEC operating mode setting and transmit/receive gain adjustment)
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. The DTMF and other tone transmit signals are enabled
by CR4-B6, and the gain setting is referenced 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
are output at the PCMOUT pin.
Gains of the side tone (path to receive side from transmit side) and the receive side tone can be set by
register CR3.
OKI Semiconductor
CR2
Initial Value
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)
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
ON/OFF
B4
0
1
0
1
0
1
0
1
TX
B7
0
TX GAIN2 TX GAIN1 TX GAIN0
Table 2 Transmit/Receive Gain Settings
Transmit Gain
B6
0
+ 2 d B
+ 4 d B
+ 6 d B
+ 8 d B
– 6 d B
– 4 d B
– 2 d B
0 d B
B5
1
B4
1
B2
0
0
0
0
1
1
1
1
0: ON 1: OFF
0: ON 1: OFF
ON/OFF
B1
0
0
1
1
0
0
1
1
RX
B3
0
B0
0
1
0
1
0
1
0
1
RX GAIN2 RX GAIN1 RX GAIN0
B2
0
Receive Gain
– 1 2 d B
+ 3 d B
+ 6 d B
+ 9 d B
– 9 d B
– 6 d B
– 3 d B
B1
0 d B
1
FEDL7041-04
ML7041
B0
1
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