msm7584c Oki Semiconductor, msm7584c Datasheet - Page 38

• Manufacturer Part Number: msm7584c
• Description: Pi /4 Shift Qpsk Modem/adpcm Codec
• Manufacturer: Oki Semiconductor

¡ Semiconductor
(4) CR3 (Side Tone and Tone Generator Gain Adjustment)
The receive side tone generator gain settings shown in Table 6 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, 0, 1), then
tones at the following levels appear at the SAO+/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 5)
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 Side Tone Side Tone
GAIN2
Table 6 Receive Side Tone Generator Gain Settings
B7
0
B0
0
1
0
1
0
1
0
1
B7
0
0
0
0
1
1
1
1
Tone Generator Gain
GAIN1
Table 5 Side Tone Gain Settings
B6
0
B6
0
0
1
1
0
0
1
1
–32 dB
–30 dB
–28 dB
–26 dB
–24 dB
–22 dB
–20 dB
–18 dB
B5
GAIN0
0
1
0
1
0
1
0
1
B5
0
ON/OFF
TONE
Receive side gain adjustment (refer to Table 6)
Side Tone Gain
B3
B4
1
1
1
1
1
1
1
1
0
–3 dBm0 (mixed tone)
–15 dB
–13 dB
–11 dB
–9 dB
–7 dB
–5 dB
–3 dB
OFF
B2
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
–16 dB
–14 dB
–12 dB
–10 dB
–8 dB
–6 dB
–4 dB
–2 dB
MSM7584C
GAIN0
TONE
B0
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