ADS-941 查看數據表（PDF） - DATEL Data Acquisition products

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ADS-941

14-Bit, 1MHz Sampling A/D Converters

DATEL Data Acquisition products  

ADS-941

®

®

N

N+1

START

CONVERT

50ns min., 100ns max

35ns max.

EOC

INTERNAL S/H

Conversion Time

600ns typ.

10ns typ.

Hold

Aquisition Time

350ns max.

OUTPUT

DATA

DATA N-1 VALID

INVALID DATA

30ns max.

DATA N VALID

400ns max.

600ns min.

Scale is approximately 50ns per division.

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 100Ω trimpot in

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

50Ω resistor instead of the trimpot for operation without

adjustment. Use a 20kΩ 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.

ZERO/OFFSET

ADJUST

20kΩ

+5V

–5V

+5V

4.7µF

0.1µF

10

11

DIGITAL

GROUND

5

OFFSET

ADJUST

+15V

4.7µF

0.1µF

4.7µF 0.1µF

–15V

12

6,

14,

15

ANALOG

GROUND

13

GAIN ADJUST

ADS-941

0 to +10V

100Ω

3 ANALOG INPUT

4 SIGNAL GROUND

0.1µF

4.7µF

1

+10V

REF. OUT

CODING SELECT 8

START CONVERT 32

ENABLE 9

BIPOLAR 2

31 BIT 1 (MSB)

30 BIT 1 (MSB)

29 BIT2

28 BIT 3

27 BIT 4

26 BIT 5

25 BIT 6

24 BIT 7

23 BIT 8

22 BIT 9

21 BIT 10

20 BIT 11

19 BIT 12

18 BIT 13

17 BIT 14 (LSB)

7 OVERFLOW

16 EOC

Figure 3. ADS-941 Connection Diagram

4

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