FEDL7732-01-10

OKI Semiconductor

MSM7732-01

20/29

CR3 (Side tone and other tone generator gain setting)

B7

B6

B5

B4

B3

B2

B1

B0

CR3

Side Tone

GAIN2

Side Tone

GAIN1

Side Tone

GAIN0

TONE

ON/OFF

TONE

GAIN3

TONE

GAIN2

TONE

GAIN1

TONE

GAIN0

Initial Value

0

0

0

0

0

0

0

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.

Table 3

B7

B6

B5

Side Tone Path Gain

0

0

0

OFF

0

0

1

–15 dB

0

1

0

–13 dB

0

1

1

–11 dB

1

0

0

–9 dB

1

0

1

–7 dB

1

1

0

–5 dB

1

1

1

–3 dB

Table 4

B3

B2

B1

B0

Tone Generator Gain

B3

B2

B1

B0

Tone Generator Gain

0

0

0

0

OFF

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 levels.

DTMF tones (low group):

–2 dBm0

DTMF tones (high group) and other tones:

0 dBm0

For example, when selecting –6 dB (B3, B2, B1, B0) = (1, 1, 1, 1) as a tone generator gain, the signal amplitude of

each DTMF tone on SAO or VFRO is as follows:

DTMF tones (low group):

–8 dBm0

DTMF tones (high group) and other tones:

–6 dBm0