73M1903C Data Sheet
DS_1903C_033
40
Rev. 5.0
Next make the sum of R2 + R3 much higher than 600
. Make sure they are lower than the input
impedance of the RXAP/RXAN pins; otherwise they can move the frequency response of the input filter.
So let R2 + R3 = 100 K
.
R3
100 K
1
Rwtot
600
1200
where
Rwtot RW
Rohswitch
2 Rbead
.
R2 100 K
R3
Use 1% resistors for R1, R2, and R3
To select the value for C1, make the zero at around 10 Hz.
1
2
π
. 100
.
K C1
.
10
C1
1
2
π
. 100
.
K 10
.
C1 0.15 uF
The blocking cap Cblock should also have the same frequency response, but due to the low impedance,
its value will be much higher, usually requiring a polarized cap. A blocking cap will also be needed on the
modem side of the transformer if the DC offset current of the transmit pins will exceed the current rating of
the transformer. This is nearly always the case for applications using both transmit drivers since the
required transformers are dry types for most applications outside the U.S.
Cblock
1
2
π
. 600
.
10
.
Cblock 27 uF
TXAP1
RXAP
R1
R3
R1
R2
R3
R2
RW
C1
TXAN1
RING
DETECTOR
C1
Bead
Hook
Switch
TIP
RING
RXAN
Figure 18: Single Transmitter Arrangement
相關(guān)PDF資料
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