ADC12181 datasheet(4/17 Pages) NSC

4 / 17 page

Pin Descriptions and Equivalent Circuits #2 (Continued)

No.

Symbol

Equivalent Circuit

Description

14-19,

22-27

D0 - D11

Digital output word, CMOS compatible. D0 (pin 14) is

LSB, D11 (pin 27) is MSB. Load with no more than

50pF.

IN com

Analog input common. Connect to a quiet point in

analog ground near the driving device. See section

1.2.

Positive analog supply pin. Connect to a clean, quiet

voltage source of +5V. V

A and VD should have a

common supply and be separately bypassed with a

5µF to 10µF capacitor and a 0.1µF chip capacitor.

4, 6

AGND

The ground return for the analog supply. AGND and

DGND should be connected together close to the

ADC12181 package. See section 5.0.

Positive analog supply pin. Connect to a clean, quiet

voltage source of +5V. V

A and VD should have a

common supply and be separately bypassed with a

5µF to 10µF capacitor and a 0.1 µF chip capacitor.

9, 12

DGND

The ground return for the analog supply. AGND and

DGND should be connected together close to the

ADC12181 package. See section 5.0

D I/O

The digital output driver supply pin. This pin can be

operated from a supply voltage of 3V to 5V, but the

voltage on this pin should never exceed the V

supply pin voltage.

DGND I/O

The ground return for the output drivers. This pin

should be returned to a point in the digital ground

that is removed from the other ground pins of the

ADC12181.

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