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參數(shù)資料
| 型號(hào)： | HC5503PR |
| 廠商： | Intersil Corporation |
| 英文描述： | () |
| 中文描述： | （） |
| 文件頁(yè)數(shù)： | 7/7頁(yè) |
| 文件大?。?/td> | 83K |
| 代理商： | HC5503PR |
4-7
All Intersil semiconductor products are manufactured, assembled and tested under
ISO9000
quality systems certification.
Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time with-
out notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and
reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result
from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see web site
www.intersil.com
Impedance Matching
For impedance matching of the 2-wire side we set the input
voltage at DR equal to zero. This effectively grounds the
VFXI+ input of the GSX amplifier. To achieve a 2-wire to 4-
wire gain (V
2W
to DX) of 0dB we need to increase the gain
of the GSX amplifier to overcome the -4dB loss in the
TP3057A. The required gain is found by using Equation 24,
repeated here for convenience in Equation 40.
V
O
Substituting the required voltage levels (Figure 7) for V
GSX
(0.82049) and V
2W
(0.60196) and rearranging to solve for
R
a2
results in Equation 41. Where: V
GSX
/ V
2W
=1.363, and
Z
0
=R
Z01:
The value of R
a2
needs to be scaled by 1000 to minimize the
effects of parallel resistance on the gain adjustment resistor
R2. The nearest standard value for R
a2
is 294k
.
R
a3
needs to increase by (1.363) to maintain the same
feedback for impedance matching Equation 42.
The closest standard value is for R
a3
is 274k
.
To achieve a 4-wire to 2-wire gain (DR to V
2W
) equal to 0dB
we need to decrease the input to the feedback circuit from
the VFRO pin to account for the +4dB increase in the
TP3057A. A simple voltage divider will decrease the 1.2276
volt input down to the required 0.60196 volts Equation 43.
R
2
Rearranging to solve for R
2
results in Equation 44.
If R
1
equals 1k
then R
2
equals 962.1
. Notice however
that R2 is in parallel with R
3
, R
Z02
+ R
a5
and R
a1
.
Therefore, the correct value of R
2
must consider this parallel
combination to achieve 0dBm0
(600
)
at the load. This
calculation results in a value of 968.57k
.
The closest standard value for R
2
is 976
.
Transhybrid Balance (Z
L
= 200 + 680//0.1
μ
F)
The internal GSX amplifier of the TP3057A is used to
perform the transhybrid balance function. For discussion
purpose, the GSX amplifier is redrawn with the external
resistors in Figure 8. The transfer function of the amplifier is
given in Equation 45 and Equation 46.
R
a5
The impedance of the series parallel complex China load is
equal to:
Setting V
OUT
equal to zero, best transhybrid balance, and
rearranging the equation we get Equation 47.
V1 is equal to (0.60196V
RMS
)(400/811) and V2 is equal to
0.60196V
RMS
. The results of rearranging Equation 47 to
solve for Ra5 and substituting in the values for V1 and V2 is
shown in Equation 48.
Closest standard value for Ra5 is 464k
.
V
GSX
4R
S
-----------
R
a2
--------------
=
(EQ. 40)
R
a2
--------------
293.47
=
=
(EQ. 41)
R
a3
200k
(
)
1.363
(
)
272.6k
=
=
(EQ. 42)
0.60196
1
---------+
1.2276
=
(EQ. 43)
R
2
R
1
0.9621
(
)
=
(EQ. 44)
GSX
-
+
Ra
2
R
Z01
Ra
5
VFXI-
VFXI+
R
Z02
V
OUT
FIGURE 8. TRANSHYBRID BALANCE CIRCUIT
V2
V1
V
OUT
V2
Z02
------------+
R
------------------------------
R
+
a2
V1
R
a2
-------------
–
=
(EQ. 45)
R
Z01
R
Z02
772k
j250
811
17.9
°
–
∠
=
–
=
=
(EQ. 46)
V2
R
a5
-----------+
294K
+
---------------–
V177294K
j250k
–
(EQ. 47)
=
R
a5
–
------------------–
421k
j200k
466k
25.4
°
–
∠
=
–
=
=
(EQ. 48)
Application Note 9872
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