®

®

ADS-941

4

Figure 3. ADS-941 Connection Diagram

Figure 2. ADS-941 Timing Diagram

Removing System Errors

Use external potentiometers to remove system errors or to

reduce the small initial errors to zero. Use a 100

Ω trimpot in

series with the analog input for gain adjustment. Use a fixed

50

Ω resistor instead of the trimpot for operation without

adjustment. Use a 20k

Ω trimpot with the wiper tied to OFFSET

ADJUST (pin 5) for zero/offset adjustment. Connect pin 5 to

ANALOG GROUND (pin 6) for operation without zero/offset

adjustment.

ADS-941

20k

Ω

31

30

29

28

27

26

25

24

23

22

21

20

19

18

17

7

16

BIT 1 (MSB)

BIT 1 (MSB)

BIT2

BIT 3

BIT 4

BIT 5

BIT 6

BIT 7

BIT 8

BIT 9

BIT 10

BIT 11

BIT 12

BIT 13

BIT 14 (LSB)

OVERFLOW

EOC

ANALOG

GROUND

DIGITAL

GROUND

0.1µF

4.7µF

0.1µF

ENABLE

4.7µF

+10V

REF. OUT

CODING SELECT

10

11

9

1

8

+5V

–5V

+5V

OFFSET

ADJUST

5

3

0.1µF

4.7µF

6, 14, 15

13

0.1µF

4.7µF

12

–15V

+15V

32

START CONVERT

ANALOG INPUT

100

Ω

2

BIPOLAR

4 SIGNAL GROUND

ZERO/OFFSET

ADJUST

0 to +10V

GAIN ADJUST

Scale is approximately 50ns per division.

START

CONVERT

INTERNAL S/H

N

N+1

35ns max.

EOC

10ns typ.

Conversion Time

600ns typ.

OUTPUT

DATA

DATA N VALID

Hold

DATA N-1 VALID

30ns max.

50ns min., 100ns max

350ns max.

Aquisition Time

INVALID DATA

600ns min.

400ns max.