MSM7584C View Datasheet(PDF) - Oki Electric Industry
Part Name
Description
MFG CO.
'MSM7584C' PDF : 57 Pages View PDF
¡ Semiconductor
MSM7584C
(3) CR2 (PCMCODEC Operation Mode Settings and Transmit/Receive Gain Adjustment)
CR2
Initial Value
B7
TX
GAIN3
0
B6
TX
GAIN2
0
B5
TX
GAIN1
0
B4
TX
GAIN0
0
B3
RX
GAIN3
0
B2
RX
GAIN2
0
B1
RX
GAIN1
0
B7, B6, B5, B4: ....... Transmit side signal gain adjustment (see Table 4)
B3, B2, B1, B0: ....... Receive side signal gain adjustment (see Table 4)
B0
RX
GAIN0
0
Table 4 Receive/Transmit Gain Settings
Transmit/
receive gain
B7
B6
B5
B4
B3
B2
B1
B0
–16dB
1
0
0
0
1
0
0
0
–14dB
1
0
0
1
1
0
0
1
–12dB
1
0
1
0
1
0
1
0
–10dB
1
0
1
1
1
0
1
1
– 8dB
1
1
0
0
1
1
0
0
– 6dB
1
1
0
1
1
1
0
1
– 4dB
1
1
1
0
1
1
1
0
– 2dB
1
1
1
1
1
1
1
1
0dB
0
0
0
0
0
0
0
0
2dB
0
0
0
1
0
0
0
1
4dB
0
0
1
0
0
0
1
0
6dB
0
0
1
1
0
0
1
1
8dB
0
1
0
0
0
1
0
0
10dB
0
1
0
1
0
1
0
1
12dB
0
1
1
0
0
1
1
0
14dB
0
1
1
1
0
1
1
1
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 (discussed later), and the gain setting is set to the levels shown below.
DTMF tones (low group): ................................. –16 dBm0
DTMF tones (high group) and other tones: ... –14 dBm0
For example, if the transmit gain set value is set to +8 dB (B7, B6, B5, B4) = (0, 1, 0, 0), then the
following tones appear at the PCMSO pin.
DTMF tones (low group): ................................. –8 dBm0
DTMF tones (high group) and other tones: ... –6 dBm0
–3 dBm0 (mixed tone)
However, the gain of the receive side tone and the gain of the side tones (path from transmit side
to receive side) are set by the CR3 register.
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