MSM7570-01 View Datasheet(PDF) - Oki Electric Industry
Part Name
Description
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MSM7570-01 Datasheet PDF : 26 Pages
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¡ Semiconductor
MSM7570-01
(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 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 and
the transmitted DTMF and other tones. The transmission of these tone signals is enabled by the
CR4-B6 data described later. The original (reference) signal amplitude of these tones is analogi-
cally defined as follows.
DTMF low-group-tones .................................... –16 dBm0
DTMF high-group-tones and others............... –14 dBm0
For example, when selecting +8 dB (B6, B5, B4) = (1,1,1) as a transmit gain, each tone signal
amplitude with an 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 for the side tone (path to receive side from transmit side) and the receive side tone
is performed by register CR3.
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