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參數(shù)資料
| 型號： | T7504 |
| 元件分類： | Codec |
| 英文描述： | T7504 and T75504 Quad PCM Codecs with Filters |
| 中文描述： | T7504和T75504四的PCM編解碼器與濾波器 |
| 文件頁數(shù)： | 10/18頁 |
| 文件大?。?/td> | 221K |
| 代理商： | T7504 |
10
Lucent Technologies Inc.
Data Sheet
March 1999
T7504 and T5504 Quad PCM Codecs with Filters
Transmission Characteristics
(continued)
Table 12. Interchannel Crosstalk (Between Channels) R
F
=
≤
200 k
(See note below.)
Table 13. Intrachannel Crosstalk (Within Channels) R
F
=
≤
200 k
(See Note below.)
Note:
For Tables 11 and 12, crosstalk into the transmit channels (VF
X
IN) can be significantly affected by parasitic
capacitive feeds from GS
X
and VF
R
O outputs. PWB layouts should be arranged to keep these parasitics
low. The resistor value of R
F
(from GS
X
to VF
X
IN) should also be kept as low as possible (while maintaining
the load on GS
X
above 10 k
per Table 4) to minimize crosstalk.
Parameter
Transmit to Receive
Crosstalk 0 dBm0
Transmit Levels
Receive to Transmit
Crosstalk 0 dBm0
Receive Levels
Transmit to Trans-
mit Crosstalk
0 dBm0 Transmit
Levels
Receive to Receive
Crosstalk 0 dBm0
Receive Levels
Symbol
CT
XX-RY
Test Conditions
f = 300 Hz—3400 Hz
idle PCM code for channel under test;
0 dBm0 into any other single channel VF
X
IN
f = 300 Hz—3400 Hz
VF
X
IN = 0 Vrms for channel under test;
0 dBm0 code level on any other single channel D
R
f = 300 Hz—3400 Hz
0 dBm0 applied to any single channel
VF
X
IN except channel under test,
which has VF
X
IN = 0 Vrms
f = 300 Hz—3400 Hz
0 dBm0 code level on any single channel D
R
except
channel under test, which has idle code applied
Min
—
Typ
–95
Max
–75
Unit
dB
CT
RX-XY
—
–92
–75
dB
CT
XX-XY
—
–90
–75
dB
CT
RX-RY
—
–95
–75
dB
Parameter
Transmit to Receive
Crosstalk 0 dBm0
Transmit Levels
Receive to Transmit
Crosstalk 0 dBm0
Receive Levels
Symbol
CT
XX-RX
Test Conditions
f = 300 Hz—3400 Hz
idle PCM code for channel under test;
0 dBm0 into VF
X
IN
f = 300 Hz—3400 Hz
VF
X
IN = 0 Vrms for channel under test;
0 dBm0 code level on D
R
Min
—
Typ
–95
Max
–65
Unit
dB
CT
RX-XX
—
–73
–65
dB
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