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參數(shù)資料
| 型號： | 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/關鍵系統(tǒng)的用戶接口，用戶線接口電路（用戶線接口電路） |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 114K |
| 代理商： | HC5503C |
4-5
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. Measure the AC voltage across tip and ring (VTR) of both
Channels A and B.
8. The Channel A to Channel B Gain is calculated using the
following formula in Equation 10.
9. To measure Channel B to Channel A Gain connect the
sine wave generator in parallel with the 600
load across
tip and ring of Channel B and repeating steps 7 and 8 in
a similar fashion. Results for both Channels should be
about the same.
10. Compare results to that listed in Table 4.
Test #8 Intra-Channel Transhybrid
Balance with Different Loads
This evaluation board is configured to give the optimum
Intra-Channel Transhybrid Balance for an impedance of
150
between the two Junctor inputs/outputs. This test will
illustrate a procedure for calculating the proper R
4
and R
14
resistor values to optimize the Intra-Channel Transhybrid
Balance when a different Cross Point or network is used.
Also included is an easy procedure to verify the calculations.
Discussion
Intra-Channel Transhybrid Balance is performed by the
Differential Amplifier (Reference Figure 3). The goal is to
cancel all of the transmit signal of Channel A by the
Differential Amplifier, so that none of the transmit signal is
feed back into the receive terminal of channel A. The transmit
signal can be cancelled by the differential amplifier by
adjusting the value of resistor R
4
. The value of R
4
is
dependent upon: the resistance value of R
6
, the resistance of
the network that connects the two Junctor inputs/outputs
together (Cross Point + R
10
) and resistor R
16
. Figure 3 is a
simplified version of the Junctor circuit and shows the critical
components required to calculate the optimum R
4
value for
Intra-Channel Transhybrid Balance.
Equation 11 is the characteristic equation for the output
voltage of the Differential Amplifier.
The voltage at V2, with respect to V1, where R
X
= resistance
of Cross Point Switch is:
Substituting Equation 12 into Equation 11, setting V0 equal to
Zero, defining R
X
′
= R
X
+ R
10
and rearranging to solve for R4:
Equation 13 can be used for the calculation of R
4
to achieve
a good Intra-Channel Transhybrid Balance in Channel A. A
similar analysis for Channel B is given in Equation 14.
The value of R
4
and R
14
can now be determined for any
network resistance. In the case of the demo board, the
network resistance (R
X
′
) is the resistance of the Cross
Point Switch (50
) and R10 (100
)
. If R
1
= R
11
= R
2
=
R
12
= R
5
= R
15
= 10k
, R
6
= R
16
= 604
and the Network
= 150
then R
4
= 12.48k
. Closest standard value is
12.7k
.
If the Network resistance is equal to 50
(Single
CD22M3493 Cross Point), then R
4
= 10.83k
.
Closest
standard value is 10.7k
.
Notice that the calculated value of R
4
and R
14
for both
Channel to Channel and Intra-channel are the same. This is
because the gain from Channel to Channel is set for one. If
the Channel to Channel gain was set to anything other than
one, the Intra-channel Transhybrid Balance would become
unacceptable. Proper operation of this circuit requires that
the Channel to Channel gain be set to one.
TABLE 4.
TEST
TIP TO RING
CHANNEL A
(V
RMS
)
TIP TO RING
CHANNEL B
(V
RMS
)
GAIN
(dB)
Channel A to Channel B
Gain
1.0074
1.0063
-0.01
Channel B to Channel A
Gain
1.0035
1.0068
-0.03
dB
20
)
)
VTR channelA
log
=
(EQ. 10)
VO
V1 1
R
4
R
5
------
+
V2
R
4
R
5
------
–
=
(EQ. 11)
V2
R
R
10
+
R
16
+
+
+
X
R
10
R
16
R
6
--------+
V1
=
(EQ. 12)
R
4
R
R
′
---------------------------------------
R
+
(
)
16
=
(EQ. 13)
R
14
R
R
′
---------------------------------------
R
+
(
)
6
=
(EQ. 14)
JUNC A
+
-
R
12
R
16
JUNC B
-5V
5V
FIGURE 3. INTRA-CHANNEL TRANSHYBRID BALANCE
TRANSMIT OUTPUT OF CHANNEL
B IS ZERO
CHANNEL
B
V2
600
R
6
600
V1
V2
+
-
-5V
5V
+
-
R
6
600
-5V
5V
VO
DIFFERENTIAL AMPLIFIER
10k
R
5
12.7k
R
4
R
2
10k
R
1
10k
V1
CHANNEL
A
50
X POINT
R
10
100
R
16
600
N
R
X
R
10
R
X
′ = R
X
+ R
10
150
R
X
′
Application Note 9813
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相關代理商/技術參數(shù) |
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| HC5503CB | 制造商:Rochester Electronics LLC 功能描述: 制造商:Intersil Corporation 功能描述: |
| HC5503CB96 | 制造商:Rochester Electronics LLC 功能描述:HC5503CB (TAPE&REEL) - Bulk |
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| HC5503CCB | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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