參數(shù)資料
型號(hào)： PEB24901H
英文描述： LTC3026 Evaluation Kit
中文描述： ？四整體數(shù)位服務(wù)網(wǎng)路Echocancellation電路數(shù)字前端4B3T線路碼的終結(jié)？
文件頁數(shù)： 24/73頁
文件大小： 1618K
代理商： PEB24901H
PEB 2466
PEF 2466
Operational Description
Hardware Reference Manual
15
2001-02-20
4.2.3
The
μ-Law
compressor unit of the SICOFI
4-μC automatically adds 1.94 dB gain, which
has to be considered for the total gain calculation. The accumulated gain of all
programmable transmit filters (AX1+AX2+FRX) must not exceed 7 dB if the device is set
to μ-Law operation. If the device is set to A-Law operation, then the accumulated gain
must not exceed 9 dB.
Compressor Gain Relative to Coding Law
Figure 6
Analog and PCM Signal Levels in A-Law Mode
Figure 7
Analog and PCM Signal Levels in μ-Law Mode
A-Law
Compressor
Transmit
A-Law
Expander
Receive
0 dBm0
1014 Hz
0 dBm0
DXA/B
DXA/B
A/D
0 dB
Gain
D/A
0 dB
Gain
V
OUT
V
IN
1014 Hz
1.095 V
rms
1.095 V
rms
2466_207
A/D
μ
-Law
Compressor
[+1.94 dB]
Transmit
D/A
μ
-Law
Expander
Receive
V
OUT
V
IN
1014 Hz
1.091 V
rms
1.091 V
rms
1.94 dBm0
1014 Hz
0 dBm0
DXA/B
DXA/B
0 dB
Gain
0 dB
Gain
2466_208
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