msm7708-02 Oki Semiconductor, msm7708-02 Datasheet - Page 25

• Manufacturer Part Number: msm7708-02
• Description: Serial Register Interface Adpcm Codec For Telephone Recording
• Manufacturer: Oki Semiconductor

¡ Semiconductor
(4) CR3 (Side Tone and Tone Generator Gain Adjustment)
The receive side tone generator gain settings shown in Table 4 are set with the following levels
as a reference.
For example, if the tone generator gain set value is set to –6 dB (B3, B2, B1, B0)=(1, 1, 1, 1), then
tones at the following levels appear at the SAO or VFRO pin.
CR3
Initial value
B3
0
0
0
0
0
0
0
0
DTMF tones (low group): ................................. –2 dBm0
DTMF tones (high group) and other tones: ... 0 dBm0
DTMF tones (low group): ................................. –8 dBm0
DTMF tones (high group) and other tones: ... –6 dBm0
B2
0
0
0
0
1
1
1
1
B7, B6, B5: ........ Side tone gain adjustment (refer to Table 3)
B4: ..................... Tone generator ON/OFF 0: OFF 1: ON
B3, B2, B1, B0: . Tone generator
B1
0
0
1
1
0
0
1
1
Side Tone
GAIN2
Table 4 Receive Side Tone Generator Gain Settings
B7
0
B0
0
1
0
1
0
1
0
1
Tone Generator Gain
B7
Side Tone
0
0
0
0
1
1
1
1
GAIN1
Table 3 Side Tone Gain Settings
B6
0
B6
–36 dB
–34 dB
–32 dB
–30 dB
–28 dB
–26 dB
–24 dB
–22 dB
0
0
1
1
0
0
1
1
Side Tone
GAIN0
B5
B5
0
1
0
1
0
1
0
1
0
Receive side gain adjustment (refer to Table 4)
ON/OFF
TONE
B4
B3
0
1
1
1
1
1
1
1
1
Side Tone Gain
–15 dB
–13 dB
–11 dB
– 9 dB
– 7 dB
– 5 dB
– 3 dB
B2
OFF
0
0
0
0
1
1
1
1
GAIN3
TONE
B3
0
B1
0
0
1
1
0
0
1
1
GAIN2
TONE
B0
B2
0
1
0
1
0
1
0
1
0
Tone Generator Gain
GAIN1
TONE
B1
0
MSM7708-02
–20 dB
–18 dB
–16 dB
–14 dB
–12 dB
–10 dB
– 8 dB
– 6 dB
GAIN0
TONE
25/38
B0
0