MSM7570-01 Datasheet, PDF (21/26 Pages) OKI electronic componets – Multi-Function ADPCM CODEC

¡ Semiconductor
MSM7570-01
(4) CR3 (Side tone and other tone generator gain setting)
CR3
Initial Value
B7
B6
B5
Side. Tone Side. Tone Side. Tone
GAIN2 GAIN1 GAIN0
0
0
0
B4
TONE
ON/OFF
0
B3
TONE
GAIN3
0
B2
TONE
GAIN2
0
B1
TONE
GAIN1
0
B7, B6, B5 ... Side tone path gain setting, refer to Table-3.
B4 ... Tone generator enable; 0/Disable, 1/Enable
B3, B2, B1, B0 ... Tone generator gain adjustment for receive side, refer to Table-4
B0
TONE
GAIN0
0
Table-3
B7 B6 B5
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Side Tone Path Gain
OFF
–21 dB
–19 dB
–17 dB
–15 dB
–13 dB
–11 dB
–9 dB
Table-4
B3 B2 B1 B0 Tone Generator Gain B3 B2 B1 B0 Tone Generator Gain
0
0
0
0
–36 dB
1
0
0
0
–20 dB
0
0
0
1
–34 dB
1
0
0
1
–18 dB
0
0
1
0
–32 dB
1
0
1
0
–16 dB
0
0
1
1
–30 dB
1
0
1
1
–14 dB
0
1
0
0
–28 dB
1
1
0
0
–12 dB
0
1
0
1
–26 dB
1
1
0
1
–10 dB
0
1
1
0
–24 dB
1
1
1
0
–8 dB
0
1
1
1
–22 dB
1
1
1
1
–6 dB
The tone generator gain setting table for the receive side, as shown in Table-4, depends upon the
following reference level.
DTMF low-group tones ................................ –2 dBm0
DTMF high-group tones and others ............ 0 dBm0
For example, when selecting –6 dB (B3, B2, B1, B0) = (1, 1, 1, 1) as a tone generator gain, each DTMF
tone signal amplitude on SAO+/SAO– or VFRO is as follows.
DTMF low-group tone .................................. –8 dBm0
DTMF high-group tone or other tones ....... –6 dBm0
21/26