CPC5604
Trans-Hybrid Loss
impedance. The Tx input frequency is swept from 30Hz-
4000Hz and the amplitude of the signal is measured on
the Rx inputs and graphed in Figure 6B.
As shown in Figure 6A, the Audio Precision, AP1 injects
a signal into the Tx inputs and measures the energy at
Rx with Tip and Ring terminated by a 600Ω nominal
Figure 6A Trans-Hybrid Loss (THL) Test Setup
40mA Loop Current
TIP
RX+
IN1
AP1
IN2
Audio Precision
System One
Analyzer
500
10H
V
100K
RX
+
-
600
48V
RX-
OH
LITELINKTM DAA Circuit
500uf
50
Audio
TX+
Precision
RING
Generator
-3dBm/30Hz-4kHz
V
500
10H
TX
TX-
THL = 20 log (V /V
)
RX TX
Figure 6B Trans-Hybrid Loss at Rx with -3dBm Signal on Tx Matched to 600Ω Impedance on T/R
+0
-2
-4
-6
-8
-10
-12
-14
-16
-18
THL
-20
-22
-24
-26
-28
-30
-32
-34
-36
-38
-40
(dBm)
500
1K
1.5K
2K
2.5K
3K
3.5K
4K
Frequency (Hz)
XXX
24
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