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參數(shù)資料
| 型號： | MSM7584C |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | π/4 Shift QPSK MODEM(π/4移動(dòng)QPSK調(diào)制解調(diào)器/ADPCM編碼譯碼器) |
| 中文描述： | π/ 4移位的QPSK調(diào)制解調(diào)器（π/ 4移動(dòng)的QPSK調(diào)制解調(diào)器/差分PcM編碼譯碼器） |
| 文件頁數(shù)： | 37/57頁 |
| 文件大?。?/td> | 321K |
| 代理商： | MSM7584C |
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Semiconductor
MSM7584C
37/57
(3) CR2 (PCMCODEC Operation Mode Settings and Transmit/Receive Gain Adjustment)
B7
TX
B6
TX
B5
TX
B4
TX
B3
RX
B2
RX
B1
RX
B0
RX
GAIN2
0
GAIN1
0
GAIN0
0
GAIN3
0
GAIN1
0
GAIN0
0
GAIN3
0
0
CR2
Initial Value
GAIN2
B7, B6, B5, B4: ....... Transmit side signal gain adjustment (see Table 4)
B3, B2, B1, B0: ....... Receive side signal gain adjustment (see Table 4)
Table 4 Receive/Transmit Gain Settings
B7
B6
B5
B4
B3
B2
B1
B0
Transmit/
receive gain
–16dB
–14dB
–12dB
–10dB
– 8dB
– 6dB
– 4dB
– 2dB
0dB
2dB
4dB
6dB
8dB
10dB
12dB
14dB
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
The above gain settings table shows the transmit/receive voice signal gain settings and the
transmit side gain settings for DTMF tones and other tones. Tone signal transmission is enabled
by CR4 - B6 (discussed later), and the gain setting is set to the levels shown below.
DTMF tones (low group):.................................–16 dBm0
DTMF tones (high group) and other tones:...–14 dBm0
For example, if the transmit gain set value is set to +8 dB (B7, B6, B5, B4) = (0, 1, 0, 0), then the
following tones appear at the PCMSO pin.
DTMF tones (low group):.................................–8 dBm0
DTMF tones (high group) and other tones:...–6 dBm0
–3 dBm0 (mixed tone)
However, the gain of the receive side tone and the gain of the side tones (path from transmit side
to receive side) are set by the CR3 register.
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