Isolated Transformer Driver
for PCMCIA Applications
MAX845
ISOLATION
BARRIER
1CT : 1.5CT : 3CT
V
IN
5V INPUT
1
10µF
4 x 1N5817
6
3
8
79L12
ISO
-12V
10µF
78L05
ISO
5V
D1
V
CC
FS
D2
GND1
2
GND2
7
SD
MAX845
4
ON/OFF
74HC04
START
8
7
3k
6
10µF
5
V
SS
CONVST
CLOCK
DATA
8
8
7
6
5
3k
6
470Ω
5
1
2
3
SIGNAL
GROUND
4
6N136
3
4
8
7
6
5
8.2k
14
11
12
10
SER
SCK
RCK
SCLR
8
QH
′
7
6N136
3
4
1
2
200Ω
5V
INPUT
11
12
10
6N136
1
2
200Ω
QH
14
SER
SCK
RCK
SCLR
QG
QE
QD
QC
QB
QA
7
6
5
4
3
2
1
15
16
13
8
D11(MSB)
D10
D9
D8
5V
INPUT
0.1µF
INPUT CLOCK
74HC595
QF
MAX176
0.1µF
ANALOG
INPUT
1
2
3
4
GND
V
DD
AIN
VREF
0.1µF
10µF
74HC04
0.1µF 10µF
QH
QG
QE
QD
QC
QB
QA
7
6
5
4
3
2
1
15
16
D7
D6
D5
D4
D3
D2
D1
D0 (LSB)
5V
INPUT
0.1µF
74HC595
QF
5V
INPUT
13
8
Figure 6. Typical Isolated Data-Conversion Application
8
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
