Note 6: For unipolar input ranges, output coding is straight binary.

Note 8: For bipolar input ranges, output coding is offset binary.

Note 9: For 0 to + 10V or ±5V ranges, 1 LSB = 2.44mV.

Note 10: For 0 to +20V or ±10V ranges, 1 LSB = 4.88mV.

Table 3. Input Ranges and Ideal Digital Output Codes

*The digital outputs will be flickering between the Indicated code and the indicated code plus one.

Figure 10. MX574/MX674A to AD585 Sample-and-Hold Interface

ANALOG INPUT VOLTAGE (V)

DIGITAL OUTPUT

0 to +10V

0 to +20V

±5V

±10V

MSB

LSB

+10.0000

+20.0000

+5.0000

+10.0000

1111 1111 1111

+9.9963

+19.9927

+4.9963

+9.9927

1111 1111 1110*

+5.0012

+10.0024

+0.0012

+0.0024

1000 0000 0000*

+4.9988

+9.9976

-0.0012

-0.0024

0111 1111 1111*

+4.9963

+9.9927

-0.0037

-0.0073

0111 1111 1110*

+0.0012

+0.0024

-4.9988

-9.9976

0000 0000 0000*

0.0000

0.0000

-5.0000

-10.0000

0000 0000 0000

STS

BIPOFF

REFOUT

REFIN

*ADDITIONAL PINS OMITTED FOR CLARITY

GND

0.1µF

ANALOG

INPUT

-15V

4.7µF

AGND

DGND

HOLD

LREF

VOUT

50Ω

50Ω

HOLD

+15V

4.7µF

0.1µF

-15V

4.7µF

0.1µF

+5V

4.7µF

0.1µF

AD585*

CONTROL

INPUTS

+15V

4.7µF

0.1µF

MX574A*

MX674A

D0–11

MAX174/MX574A/

MX674A

Industry-Standard, Complete 12-Bit ADCs

www.maximintegrated.com

Maxim Integrated │ 13