MSM7575GS-BK Просмотр технического описания (PDF) - Oki Electric Industry
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MSM7575GS-BK Datasheet PDF : 26 Pages
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¡ Semiconductor
MSM7575
(3)CR2 (PCM CODEC operational mode setting and transmit/receive gain adjustment)
CR2
Initial Value
B7
B6
B5
B4
B3
B2
B1
B0
TX ON/OFF TX GAIN2 TX GAIN1 TX GAIN0 RX ON/OFF RX GAIN2 RX GAIN1 RX GAIN0
0
0
1
1
0
0
1
1
B7 ... PCM Coder disable :
0/Enable, 1/Disable (transmit PCM idle pattern)
B6, B5, B4 ... Transmit gain adjustment, refer to Table-2.
B3 ... PCM Decoder disable : 0/Enable, 1/Disable (receive PCM idle pattern)
B2, B1, B0 ... Receive gain setting, refer to Table-2.
B6 B5 B4
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Table-2 Transmit/Receive Gain Setting table
Transmit Gain
–6 dB
–4 dB
–2 dB
0 dB
+2 dB
+4 dB
+6 dB
+8 dB
B2 B1 B0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Receive Gain
–6 dB
–4 dB
–2 dB
0 dB
+2 dB
+4 dB
+6 dB
+8 dB
This programmable gain table should be assigned, not only for transmit/receive voice signal, but
also for the transmitted DTMF and other tones. The transmission of these tone signals are
enabled, by the CR4-B6 data described later, The original (reference) signal amplitude of these
tones are analogically defined as follows.
DTMF low-group-tones .................................... –16 dBm0/Tone
DTMF high-group-tones and others............... –14 dBm0/Tone
For example, when selecting +8 dB (B6, B5, B4) = (1,1,1) as a transmit gain, each tone signal
amplitude with analogical expression on the pin PCMSO becomes as follows .
DTMF low-group tones .................................... –8 dBm0
DTMF high-group tones and other tones ...... –6 dBm0
Gain setting of side tone (path to receive side from transmit side) and receive side tone is
performed by register CR3.
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