MAX845 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX845 Datasheet PDF : 16 Pages
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TELEPHONE SUBSCRIBER LINE
Isolated Transformer Driver
for PCMCIA Applications
6.8V
1k
2W
D1
Q1
100k
2N3906
100k
2M
680k
100k
100k
ISOLATION
BARRIER
6
T1
VCC
1 1:2:1
D1
C1
0.1µF
IC1
4
MAX845
SD
8
D2
FS 3 N.C.
Q2
2N3904
GND1 GND2
2
7
D2
1N5817
0.1µF
ISO
GND
D3
1N5817
22k
IC2
TL431
22k
5V @ 50mA
ISO OUTPUT
Figure 7. 5V from Telephone-Subscriber Line
VIN
5V
6
VCC
1
D1
MAX845
4
SD
GND1
2
8
D2
GND2
7
ISOLATION
BARRIER
1CT:5CT
1N5817
1N5817
0.1V to 0.5V
3
7
1
6
2
MAX480
2
4
3
4
49.9k
IL300
6
5
Figure 8. Typical 4mA/20mA Application Circuit
24V UNREGULATED
10µF
IN
78L05
GND
OUT
3
6
49.9k MAX480
2
4
RL
0k to 1k
ISO
5V
7
2N3904
IOUT
4mA to 20mA
2N3904
10k
24.9Ω
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