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參數(shù)資料
| 型號： | T7503 |
| 元件分類： | Codec |
| 英文描述： | T7503 Dual PCM Codec with Filters |
| 中文描述： | T7503雙PCM編解碼器與濾波器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 417K |
| 代理商： | T7503 |
Lucent Technologies Inc.
9
Data Sheet
February 1998
T7503 Dual PCM Codec with Filters
Transmission Characteristics
(continued)
ac Transmission Characteristics
(continued)
* For Table 12, crosstalk into the transmit channels (VF
X
IN) can be significantly affected by parasitic capacitive feeds from GS
X
and VF
R
O out-
puts. PWB layouts should be arranged to keep these parasitics low. The resistor value of RF (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.
* For Table 13, crosstalk into the transmit channels (VF
X
IN) can be significantly affected by parasitic capacitive feeds from GS
X
and VF
R
O out-
puts. PWB layouts should be arranged to keep these parasitics low. The resistor value of RF (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.
Table 12. Interchannel Crosstalk (Between Channels) R
F
=
≤
400 k
*
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
—
Max
–75
Unit
dB
CT
RX-XY
—
—
–75
dB
CT
XX-XY
—
—
–75
dB
CT
RX-RY
—
—
–75
dB
Table 13. Intrachannel Crosstalk (Within Channels) R
F
=
≤
400 k
*
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
—
Max
–65
Unit
dB
CT
RX-XX
—
—
–65
dB
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