msm7570l-01 Oki Semiconductor, msm7570l-01 Datasheet - Page 20

• Manufacturer Part Number: msm7570l-01
• Description: Multi-function Adpcm Codec Msm7570l-01/02multi-function Adpcm Codec
• Manufacturer: Oki Semiconductor

¡ Semiconductor
B7 ... PCM Coder disable;
B6, B5, B4 ... Transmit gain adjustment, refer to Table-2.
B3 ... PCM Decoder disable;
B2, B1, B0 ... Receive gain setting, refer to Table-2.
This programmable gain table, not only for transmit/receive voice signal and the transmitted
DTMF and other tones. The transmission of these tone signal is enabled by the CR4-B6 data
described later. The original (reference) signal amplitude of these tones is analogically defined
as follows.
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 .
Gain setting for the side tone (path to receive side from transmit side) and the receive side tone
is performed by register CR3.
(3) CR2 (PCM CODEC operational mode setting and transmit/receive gain adjustment)
CR2
Initial Value
B6
0
0
0
0
1
1
1
1
B5
0
0
1
1
0
0
1
1
B4
0
1
0
1
0
1
0
1
DTMF low-group-tones .................................... –16 dBm0
DTMF high-group-tones and others............... –14 dBm0
DTMF low-group tones .................................... –8 dBm0
DTMF high-group tones and other tones ...... –6 dBm0
TX ON/OFF
B7
0
Transmit Gain
TX GAIN2
B6
0
–6 dB
–4 dB
–2 dB
+2 dB
+4 dB
+6 dB
+8 dB
0 dB
0/Enable, 1/Disable (transmit PCM idle pattern)
0/Enable, 1/Disable (receive PCM idle pattern)
TX GAIN1
B5
0
Table-2
TX GAIN0
B4
B2
0
0
0
0
0
1
1
1
1
RX ON/OFF
B1
0
0
1
1
0
0
1
1
B3
0
B0
0
1
0
1
0
1
0
1
RX GAIN2
B2
0
Receive Gain
MSM7570L-01/02
RX GAIN1
–4 dB
–2 dB
+2 dB
+4 dB
+6 dB
+8 dB
B1
–6 dB
0 dB
0
RX GAIN0
B0
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0