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)： 6/7頁
文件大小： 83K
代理商： HC5503PR
4-6
Specific Implementation for China
The design criteria for a China specific solution are as
follows:
Desired line circuit impedance is 200 + 680//0.1
μ
F
Receive gain (V
2W
/V
DR
) is -3.5dB
Transmit gain (V
DX
/V
2W
) is 0dB
0dBm0 is defined as 1mW into the complex impedance
at 1020Hz
R
p
= 50, R
s
= 100
Figure 7 gives the reference design using the Intersil
HC5503PRC SLIC and the Texas Instruments TP3057A
combined PCM CODEC and filter. Also shown in Figure 7
are the voltage levels at specific points in the circuit. These
voltages will be used to adjust the gains of the network.
Adjustment to get -3.5dBm0 at the Load
Referenced to 600
The voltage equivalent to 0dBm0 into 811
(0dBm0
(811
)
)
is calculated using Equation 36.
2
The gain referenced back to 0dBm0
(600
)
is equal to:
0.90055V
RMS
The adjustment to get -3.5dBm0 at the load referenced to
600
is:
The voltage at the load (referenced to 600
) is given in
Equation 39.
GSX
-
+
Ra
2
R
Z01
Ra
5
VFXI-
VFXI+
R
Z02
V
OUT
FIGURE 6. TRANSHYBRID BALANCE CIRCUIT
V1
V2
0dBm
811
(
)
10
)
-----------------------------
log
0.90055V
RMS
=
=
(EQ. 36)
GAIN
20
--------------------------------------
log
1.309dB
=
=
(EQ. 37)
Adjustment
3.5dBm0
–
1.309dBm0
+
2.19
–
dB
=
=
(EQ. 38)
2.19
–
dBm
600
(
)
10
2
)
-----------------------------
log
0.60196V
RMS
=
=
(EQ. 39)
TEXAS
GSX
INSTRUMENTS
TP3057A
DR
DX
+ 4dB
- 4dB
FIGURE 7. REFERENCE DESIGN OF THE HC5503PRC AND THE TP3057A WITH CHINA COMPLEX LOAD IMPEDANCE
T
F
R
F
INTERSIL
HC5503PRC
R
X
T
X
0.47
μ
100k
0.47
μ
Ra
3
274k
V
TX =
V
2W
(400/811)
R
S
100
R
P
50
R
S
100
R
P
50
Z
O
200
+ 681
|| 0.1
μ
F
Ra
2
R
Z01
V
RX
-
Ra
4
200k
V
GSX
Ra
1
Ra
5
V
IN
R
811k
V
2W
-
+
VFXI-
VFXI+
PCM
Bus
0dBm0
(600
)
0.7745V
RMS
1.22765V
RMS
+4dBm0
(600
)
VFRO
R
976k
R
1
1k
0dBm0
(600
)
0.60196V
RMS
-2.19dBm0
(600
)
0.60196V
RMS
-2.19dBm0
(600
)
0.60196V
RMS
-8.32dBm0
(600
)
(0.60196)(400/811)V
RMS
0.82049V
RMS
+0.5dBm0
(600
)
-3.5dBm0
(600
)
0.51769V
RMS
464k
R
F
267k
294k
811k
G4-2
G2-4
-
Application Note 9872
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