ADS-EVAL4 데이터 시트보기 (PDF) - Murata Power Solutions

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ADS-EVAL4

14-Bit, 2MHz Sampling A/D Converters

Murata Power Solutions 

ADS-942

®

®

ZERO/OFFSET

ADJUST

20kΩ

+15V

–15V

+5V

4.7µF

0.1µF

10

11

DIGITAL

GROUND

5

OFFSET

ADJUST

+15V

4.7µF

0.1µF

4.7µF

–15V

0.1µF

GAIN ADJUST

12

6,

14,

15

ANALOG

GROUND

13

ADS-942

0 to +10V

100Ω

3 ANALOG INPUT

4 SIGNAL GROUND

CODING SELECT 8

31 BIT 1 OUT (MSB)

30 BIT 1 OUT (MSB)

29 BIT 2 OUT

28 BIT 3 OUT

27 BIT 4 OUT

26 BIT 5 OUT

25 BIT 6 OUT

24 BIT 7 OUT

23 BIT 8 OUT

22 BIT 9 OUT

21 BIT 10 OUT

20 BIT 11 OUT

19 BIT 12 OUT

18 BIT 13 OUT

17 BIT 14 OUT (LSB)

7 OVERFLOW

16 EOC

+5V

0.1µF

4.7µF

1 +10V REF. OUT

START CONVERT 32

ENABLE 9

BIPOLAR 2

Figure 3. ADS-942 Connection 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.

Table 3. Output Coding

UNIPOLAR

SCALE

+FS – 1 LSB

+7/8 FS

+3/4 FS

+1/2 FS

+1/4 FS

+1/8 FS

+1 LSB

0

INPUT VOLT.

0 TO +10V

STRAIGHT BIN.

COMP. BINARY

MSB

OUTPUT CODING

LSB MSB

LSB

MSB

INPUT VOLT.

LSB

±5V

+9.999390

+8.750000

+7.500000

+5.000000

+2.500000

+1.250000

+0.000610

0.000000

11 1111 1111 1111

11 1000 0000 0000

11 0000 0000 0000

10 0000 0000 0000

01 0000 0000 0000

00 1000 0000 0000

00 0000 0000 0001

00 0000 0000 0000

00 0000 0000 0000

00 0111 1111 1111

00 1111 1111 1111

01 1111 1111 1111

10 1111 1111 1111

11 0111 1111 1111

11 1111 1111 1110

11 1111 1111 1111

01 1111 1111 1111

01 1000 0000 0000

01 0000 0000 0000

00 0000 0000 0000

11 0000 0000 0000

10 1000 0000 0000

10 0000 0000 0001

10 0000 0000 0000

+4.999390

+3.750000

+2.500000

0.000000

–2.500000

–3.750000

–4.999390

–5.000000

OFF. BINARY

COMP. OFF. BIN.

TWO'S COMP.

BIPOLAR

SCALE

+FS – 1LSB

+3/4FS

+1/2FS

0

–1/2FS

–3/4FS

–FS+1LSB

–FS

4

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