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T7502

Dual PCM Codec with Filters

Agere -> LSI Corporation 

Data Sheet

February 1998

T7502 Dual PCM Codec with Filters

Transmission Characteristics (continued)

ac Transmission Characteristics (continued)

Table 12. Interchannel Crosstalk (Between Channels) RF = ≤400 kΩ*

Parameter

Symbol

Test Conditions

Min Typ Max Unit

Transmit to Receive CTXX-RY

Crosstalk 0 dBm0

Transmit Levels

f = 300 Hz—3400 Hz

idle PCM code for channel under test;

0 dBm0 into any other single-channel VFXIN

— — –75 dB

Receive to Transmit CTRX-XY

f = 300 Hz—3400 Hz

— — –75 dB

Crosstalk 0 dBm0

VFXIN = 0 Vrms for channel under test;

Receive Levels

0 dBm0 code level on any other single-channel DR

Transmit to Trans-

mit Crosstalk

0 dBm0 Transmit

Levels

CTXX-XY

f = 300 Hz—3400 Hz

0 dBm0 applied to any single-channel

VFXIN except channel under test,

which has VFXIN = 0 Vrms

— — –75 dB

Receive to Receive CTRX-RY

f = 300 Hz—3400 Hz

— — –75 dB

Crosstalk 0 dBm0

0 dBm0 code level on any single-channel DR except

Receive Levels

channel under test which has idle code applied

* For Table 12, crosstalk into the transmit channels (VFXIN) can be significantly affected by parasitic capacitive feeds from GSX and VFRO out-

puts. PWB layouts should be arranged to keep these parasitics low. The resistor value of RF (from GSX to VFXIN) should also be kept as low

as possible (while maintaining the load on GSX above 10 kΩ per Table 4) to minimize crosstalk.

Table 13. Intrachannel Crosstalk (Within Channels) RF = ≤400 kΩ*

Parameter

Transmit to Receive

Crosstalk 0 dBm0

Transmit Levels

Receive to Transmit

Crosstalk 0 dBm0

Receive Levels

Symbol

CTXX-RX

CTRX-XX

Test Conditions

f = 300 Hz—3400 Hz

idle PCM code for channel under test;

0 dBm0 into VFXIN

f = 300 Hz—3400 Hz

VFXIN = 0 Vrms for channel under test;

0 dBm0 code level on DR

Min Typ Max Unit

— — –65 dB

— — –65 dB

* For Table 13, crosstalk into the transmit channels (VFXIN) can be significantly affected by parasitic capacitive feeds from GSX and VFRO out-

puts. PWB layouts should be arranged to keep these parasitics low. The resistor value of RF (from GSX to VFXIN) should also be kept as low

as possible (while maintaining the load on GSX above 10 kΩ per Table 4) to minimize crosstalk.

Lucent Technologies Inc.

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