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參數(shù)資料
| 型號(hào)： | HC5503C |
| 廠商： | Intersil Corporation |
| 英文描述： | Unbalanced PBX/ Key System SLIC,Subscriber Line Interface Circuit(用戶線接口電路) |
| 中文描述： | 不平衡交換機(jī)/關(guān)鍵系統(tǒng)的用戶接口，用戶線接口電路（用戶線接口電路） |
| 文件頁(yè)數(shù)： | 3/8頁(yè) |
| 文件大?。?/td> | 114K |
| 代理商： | HC5503C |
4-3
conversion is accomplished by the connection of a Differential
Amplifier and a Summing Amplifier. The Differential Amplifier
and Summing Amplifier are used to cancel the return signal
andpreventecho(referenceFigure6).Inthisone-portnetwork,
echo can occur in two ways: Channel to Channel and Intra-
Channel. Reference Figure 5 for signal path for both channel-
to-channel and intra-channel signals.
Test #5 Channel to Channel Transhybrid
Definition
The removal of the receive signal from the transmit signal, to
prevent an echo on the transmit side is defined as Channel
to Channel Transhybrid Balance. In other words, Channel to
Channel Transhybrid signals occur when the receive signal
(from Channel B) is retransmitted along with the transmit
signal of Channel A back to Channel B.
Channel to Channel Transhybrid Balance is performed by
the Summing Amplifier (the output of this amplifier is SUM A
and SUM B in Figure 6).
Setup
1. Connect the power supplies to the Evaluation board.
2. Set V
BAT
to -48V, V
CC
to +5V and V
EE
to -5V.
3. Set the DPDT switch (S1) to Junctor operation. This
connects the Onboard Op Amp, Cross Point Switch and
the second HC5503X SLIC to the Transmit and Receive
outputs of Channel A.
4. Terminate tip and ring of
both
Channel A and Channel B
with a 600
load.
5. Connect a sine wave generator in parallel with the 600
load across tip and ring of Channel A. The output of this
generator needs to be floating.
6. Set the generator for 1V
RMS
at 1kHz.
7. Connect an AC volt meter between test point DIFF B and
ground. This will measure the AC voltage at the output to
the Differential Amplifier (DIFF B).
8. Connect an AC volt meter between test point SUM B and
ground. This will measure the AC voltage at the output of
the Summing Amplifier (SUM B).
9. The Channel to Channel Transhybrid Balance is
calculated using the following formula in Equation 2.
10. To measure Channel to Channel Transhybrid Balance on
Channel A, connect the sine wave generator in parallel
with the 600
load across tip and ring of Channel B and
repeating steps 7 through 9 in a similar fashion. Voltage
measurements taken at DIFF A and SUM A. Results for
both Channels should be the same.
11. Compare results to that listed in Table 3.
Test #6 Intra-Channel Transhybrid
Definition
Intra-Channel Transhybrid Balance is defined as the removal
of the transmit signal from the receive signal, and thereby
cancellation of echo, within a channel. In other words, Intra-
Channel Transhybrid Balance is when the transmit signal
from Channel A is feed back into the input of Channel A.
Intra-Channel Transhybrid Balance is performed by the
Differential Amplifier (the output of this amplifier is DIFF A
and DIFF B in Figure 6).
Calculation of resistor value (R
4
) for optimum Intra-Channel
Transhybrid Balance is discussed in Test #8.
Setup
1. Connect the power supplies to the Evaluation board.
2. Set V
BAT
to -48V, V
CC
to +5V and V
EE
to -5V.
3. Set the DPDT switch (S1) to Junctor operation. This
connects the Onboard Op Amp, Cross Point Switch and
the second HC5503X SLIC to the Transmit and Receive
outputs of Channel A.
4. Terminate tip and ring of
both
Channel A and Channel B
with a 600
load.
5. Connect a sine wave generator in parallel with the 600
load across tip and ring of Channel A. The output of this
generator needs to be floating.
6. Set the generator for 1V
RMS
and 1kHz.
7. Connect an AC volt meter between test point SUM A and
ground. This will measure the AC voltage at the input to
the Differential Amplifier (SUM A).
8. Connect an AC volt meter between test point DIFF A and
ground. This will measure the AC voltage at the output of
the Differential Amplifier (DIFF A).
9. The Inter-Channel Transhybrid Balance is calculated
using the following formula in Equation 3.
10. To measure Inter-Channel Transhybrid Balance on
Channel B, connect the sine wave generator in parallel
with the 600
load across tip and ring of Channel B and
repeating steps 7 through 9 in a similar fashion. Voltage
measurements taken at SUM B and DIFF B. Results for
both Channels should be the same.
11. Compare results to that listed in Table 3.
Test #7 Channel A to Channel B Gain
This demo board is configured to have a Channel to Channel
gain of 1 or 0dB. This test will illustrate a procedure for
calculating the proper R
4
resistor value to achieve a Channel
dB
20
DIFFB
log
=
(EQ. 2)
TABLE 3.
TEST
SUM TYP
(V
RMS
)
DIFF TYP
(V
RMS
)
TRANSHYBRID
BALANCE (dB)
Channel to Channel
Transhybrid Balance
Channel A to B
Channel B to A
18.45m
20.79m
1.009
1.007
-34.7
-33.7
Intra-Channel
Transhybrid Balance
Channel A
Channel B
0.986
0.990
64.9m
67.0m
-23.6
-23.4
dB
20
SUMA
log
=
(EQ. 3)
Application Note 9813
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| HC5503CCB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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