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MAX253
(Rev.:2010)

Transformer Driver for Isolated RS-485 Interface

Maxim Integrated 

Transformer Driver for

Isolated RS-485 Interface

78L05

ISOLATION

VIN

5V

BARRIER

1CT : 1.5CT : 3CT*

1 D1

ISO

5V

10μF

4 x 1N5817

6 VCC MAX253

79 L12

8

D2

4 ON/OFF

SD

ISO

-12V

10μF

GND1 GND2

2

7

10μF

0.1μF

ANALOG

INPUT

0.1μF

10μF

MAX176

1

VDD

8

VSS

2

7

AIN CONVST

3

VREF

4

GND

6

CLOCK

5

DATA

0.1μF 10μF

3kΩ

3kΩ

470Ω

SIGNAL

GROUND

5V

6N136

8

1

7

2 200Ω

6

3

5

4

6N136

8

1

7

2 200Ω

6

3

5

4

6N136

1

8

74HC04

2

7 8.2kΩ

3

6

4

5

74HC04

START

INPUT CLOCK

14

11

12

5V 10

QH 7

6

SER

QG

74HC595 QF 5

SCK

QE 4

3

QD

RCK

QC 2

QB 1

SCLR

15

QA

16

13

8

D11(MSB)

D10

D9

D8

5V

0.1μF

14

11

12

5V 10

8

QH′ QH 7

SER

QG 6

74HC595 QF 5

SCK

QE 4

QD 3

RCK

QC 2

QB 1

SCLR

QA 15

16

13

8

D7

D6

D5

D4

D3

D2

D1

D0(LSB)

5V

0.1μF

*SEE TABLE 2

Figure 10. Typical Isolated ADC Application

14 ______________________________________________________________________________________

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