CPC5604
Differential and Single Ended Mode
The LiteLinkTM is designed to support either differential
or single ended signals on Tx and/or Rx pins. The deci-
sion of which topology to use is based on the particular
chipset being used to drive the LiteLinkTM. For example,
most Lucent modem chips require both differential
receive and transmit ability, while most Rockwell
devices require differential transmit and single ended
receive. The LiteLinkTM supports a full 0dBm differential
signal on its Tx inputs.
Receive and Transmit Frequency Response
Figures 4A and 4C show the test circuits for receive and
transmit frequency response respectively. Figures
4B and 4D show the graphs for receive and transmit fre-
quency response respectively.
Figure 4A Receive Frequency Response Setup
Audio
Precision
System One
Analyzer
40mA Loop Current
TIP
RX+
IN1
AP1
IN2
500
10H
100K
V
RX
Audio
+
-
Precision
Generator
600
LITELINKTM DAA Circuit
48V
470
uF
RX-
V
T/R
-3dBm/
20Hz-4kHz
OH
RING
500
10H
INSERTION LOSS (dB) = 20 log (V
/ V
RX T/R
)
Figure 4B Receive Frequency Response Rx+
+3
+2.5
+2
+1.5
+1
+0.5
-0
-0.5
Gain
(dBm)
-1
-1.5
-2
-2.5
-3
-3.5
-4
-4.5
-5
20
50
100
200
Frequency (Hz)
500
1K
2K
4K
XXX
20
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