CALIBRATION PROCEDURE

Unipolar Output Current

1. Connect the converter as shown in Figure 2.

2. Set all inputs low and adjust the ZERO ADJUST potentiometer for a reading

of 0V at the output.

3. Set all inputs high and adjust the GAIN ADJUST potentiometer for a read-

ing of –F.S. + 1LSB (See Table 1).

Bipolar Output Current

1. Connect the converter as shown in Figure 3.

2. Set all inputs low and adjust the OFFSET ADJUST and LOAD potentiometer

for an output reading of +F.S. (See Table 2).

3. Set all inputs high and adjust the GAIN ADJUST potentiometer for an

output reading of –F.S. + 1LSB (See Table 2).

Table 3. Programmable Output Range Pin Connections

OUTPUT VOLTAGE

RANGE

FEEDBACK

CONNECTIONS

CONNECT THESE

PINS TOGETHER

0 to –5V

PIN 19

PIN 17 to PIN 18 / PIN 20 to PIN 23

0 to –10V

PIN 19

PIN 20 to PIN 23

±2.5V

PIN 19

PIN 17 to PIN 18 / PIN 20 to PIN 18

±5V

PIN 19

PIN 20 to PIN 18

±10V

PIN 17

PIN 20 to PIN 18

Table 1. 12-Bit Unipolar Output Coding

UNIPOLAR SCALE

INPUT CODING

STRAIGHT BINARY

ANALOG OUTPUT

0 TO 1V F.S. 0 TO –5V F.S. 0 TO –10V F.S.

–F.S. + 1LSB

1111 1111 1111

+0.9998V

–4.9988V

–9.9976V

–3/4F.S.

1100 0000 0000

+0.7500V

–3.7500V

–7.5000V

–1/2F.S.

1000 0000 0000

+0.5000V

–2.5000V

–5.0000V

–1/4F.S.

0100 0000 0000

+2.5000V

–1.2500V

–2.5000V

–1LSB

0000 0000 0001

+0.0002V

–0.0012V

–0.0024V

0

0000 0000 0000

0.0000V

0.0000V

0.0000V

Table 2. 12-Bit Bipolar Output Coding

BIPOLAR

SCALE

INPUT CODING

OFFSET BINARY

ANALOG OUTPUT

±0.5V F.S.

±2.5V F.S.

±5V F.S.

±10V F.S.

–F.S. + 1LSB

1111 1111 1111

+0.4998V

–2.4988V

–4.9976V

–9.9951V

–1/2F.S.

1100 0000 0000

+0.1250V

–1.2500V

–2.5000V

–5.0000V

–1LSB

1000 0000 0001

+0.0002V

–0.0012V

–0.0024V

–0.0049V

0

1000 0000 0000

0.0000V

0.0000V

0.0000V

0.0000V

+1/2F.S.

0100 0000 0000

–0.1250V

+1.2500V

+2.5000V

+5.0000V

+F.S. – 1LSB

0000 0000 0001

–0.4998V

+2.4988V

+4.9976V

+9.9951V

+F.S.

0000 0000 0000

–0.5000V

+2.5000V

+5.0000V

+10.0000V

Figure 2. DAC-HF Calibration Circuit

1μF

+

100

2M

+

BIT 1

OUTPUT

I

+15V

GAIN

ADJUST

BIT 12

12

1

24

23

22

20

21

16

15

14

13

19

17

18

OUT

0.1μF

–15V

1μF

0.1μF

ZERO

ADJUST

25k

–15V

+15V

400 LOAD

(FOR 0 TO

+1V FS)

Figure 3. Bipolar Current Output Connections

1μF

+

+

BIT 1

OUTPUT

I

+15V

BIT 12

12

1

24

23

22

20

21

16

15

14

13

19

17

18

OUT

0.1μF

–15V

1μF

0.1μF

100

OFFSET

ADJUST

100

GAIN

ADJUST

LOAD

(444 NOMINAL)

(FOR 0 TO ±0.5V FS)

200

370

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 USA • Tel: (508) 339-3000 • www.datel.com • e-mail: help@datel.com

DAC-HF

Ultra-Fast, 8/10/12-Bit Digital-to-Analog Converters

MDA_DAC-HF.B05 Page 3 of 5