參數(shù)資料
型號(hào)： HC5503PR
廠商： Intersil Corporation
英文描述： ()
中文描述： （）
文件頁數(shù)： 3/7頁
文件大?。?/td> 83K
代理商： HC5503PR
4-3
Receive Gain (V
IN
to V
2W
)
4-wire to 2-wire gain is equal to the V
2W
divided by the input
voltage V
IN
, reference Figure 3. The gains through the
CODEC are not considered at this point.
The 2-wire voltage V
2W
is determined by a loop equation
and is given in Equation 16.
Combining Equation 5 and Equation 9, gives and expression
for V
TR
in terms of V
RX
, as shown in Equation 17.
R
f
a1
The voltage at V
TR
is therefore a function of V
TX
and V
IN
.
Note: Contribution from V
GSX
(middle term in Equation 17)
is zero due to the transhybrid circuit, reference section titled
“Transhybrid Balance G(4-4)”.
This reduces Equation 17 to Equation 18.
Substituting 4R
S
I
L
(Equation 3) for V
TX
in Equation 18 and
combining this with Equation 16, results in an equation for
V
2W
in terms of:
I
L
, the external resistors and the input
voltage V
IN
(Equation 19).
Ohms law defines
I
L
as being equal to -V
2W
/Z
O
.
Substituting -V
2W
/Z
O
for
I
L
in Equation 19 gives Equation
20.
Equation 20 can be rearranged to solve for the 4-wire to 2-
wire gain V2W/V
IN
, as shown in Equation 21.
Given: R
f
=100k
,
R
a4
=200k
,
R
a1
=267k
,
Z
O
=600
,
R
S
=100
,
R
P
=50
.
Note: By making Ra4 equal to 2Rf the 4-wire to 2-wire gain
becomes -1.
Transmit Gain across HC5503PRC
(V
2W
to V
TX
)
The output voltage of the SLIC (V
TX
) was defined in
Equation 3 as being equal to 4R
S
I
L
.
I
L
is equal to twice
the input voltage (2V
RX
) divided by the total loop resistance
as shown in Figure 4. If the load impedance is 600
, then
the gain across the HC5503PRC is 2/3 the input voltage
V
RX
. Likewise, if the load impedance is 811
, (next example
with a complex load) then the gain across the HC5503PRC
is 400/811 times the input voltage V
RX.
Transmit Gain (V
2W
to V
GSX
)
2-wire to 4-wire gain is equal to the V
GSX
voltage divided by
the 2-wire voltage V
2W
, reference Figure 3.
V
2W
A
4W
2W
–
V
IN
-----------
=
(EQ. 15)
V
2W
2R
P
2R
S
+
(
)
I
L
V
TR
+
=
(EQ. 16)
V
TR
2V
RX
2
V
–
TX
----------
V
R
Rf
a2
a3
---------------------------------
V
R
f
a4
---------------
–
+
=
=
(EQ. 17)
V
TR
2V
RX
2 V
TX
R
f
a1
----------
V
R
f
a4
---------------
+
–
=
=
(EQ. 18)
V
2W
2R
P
2R
S
+
(
)
I
L
=
8R
S
I
L
R
f
a1
----------
2
V
R
f
a4
---------------
–
–
(EQ. 19)
V
2W
2R
P
2R
S
+
(
)
–
V
O
-----------
=
8R
S
V
O
-----------
R
f
a1
----------
2
V
R
f
a4
---------------
–
+
(EQ. 20)
A
4W
2W
–
V
IN
-----------
2R
f
a4
----------
–
R
Z
S
a1
P
)
R
a1
Z
O
8
–
R
S
R
f
+
---------------------------+
×
=
=
(EQ. 21)
A
2W
4W
–
---------------
=
(EQ. 22)
FIGURE 3. RECEIVE GAIN G(4-2), TRANSMIT GAIN (2-4) AND TRANSHYBRID BALANCE (FEEDBACK CIRCUIT ONLY)
T
F
R
F
INTERSIL
HC5503PRC
R
X
T
X
0.47
μ
R
f
0.47
μ
R
a3
= 2R
f
R*4R
S
R
P
+R
S
V
TX =
4R
S
I
L
R
S
100
R
P
50
R
S
100
R
P
50
Z
O
VFRO
R
a2
= 4R
s
R
Z01
= Z
0
V
RX
R
a4
= 2R
f
V
GSX
R
a1
=
R
a5
V
IN
V
TR
+
-
R
Z02
= Z
0
V
2W
= (2R
P
+2R
S
)
I
L
+ V
TR
I
L
V
2W
-
+
LOOP EQUATION
VFXI-
VFXI+
TEXAS
GSX
DR
DX
+ 4dB
- 4dB
-
-
INSTRUMENTS
TP3057A
Application Note 9872
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