MAX194 Evaluation System/Evaluation Kit

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9

RESET

10

CONV

9

CS

13

2

CONVCLK

12

8

DOUT

5

SCLK

3

EOC

7

BP / UP/ SHDN

1

4

5

8

BUFFERED

INPUT

1

D2

1N5819

7

6

2

3

= DIGITAL

GROUND

= ANALOG

GROUND

MAX194

U8

MAX400CPA

DGND VSSD

VSSD

AGND VSSA

VSSA

VDDD

VDDA

VDDA

AIN

AIN

REF

CLK

-9V / FILTERED

+9V / FILTERED

C9

10

µF

C4

0.1

µF

C8

10

µF

C2

0.1

µF

C29

0.1

µF

C26

0.1

µF

C171

0.01

µF

C7

15

µF

C6

15

µF

C1

0.1

µF

C5

0.1

µF

R41

22

Ω

R61

1k

R51, 47k

R12, 20k

INPUT BUFFER (OPTIONAL)

R9

10M

RESET

CONV

CS

DOUT

SCLK

EOC

BP / UP/ SHDN

VREF

4

1

2

5

8

1

7

6

2

VIN

TEMP

GND

8

7

6

5

COMP

VOUT

TRIM

1

2

3

DIRECT INPUT

4

416

3

3

U5

MAX400CPA

MAX874

U2

U1

-9V / FILTERED

JU10

+9V / FILTERED

R17

4M (OPTIONAL)

+12V / UNREGULATED

R16

1M (OPTIONAL)

R15

2M (OPTIONAL)

JU9

JU2

JU8

C24

0.1

µF

C19

0.1

µF

4.096V

C17

0.01

µF

C23

0.1

µF

C28

(OPTIONAL)

1000pF

to 0.01

µF

C30

(OPTIONAL)

15

µF

20V

C21

10

µF

C20

0.1

µF

R4

22

Ω

R6

1k

R5, 47k

611

14

15

REFERENCE BUFFER

C3

1

µF

C22

47

µF

LOW-ESR

SANYO

6SA47M

IS3

VDDD

IS4

IS1

IS2

Figure 1. MAX194 EV Kit Schematic