ADC12L063 datasheet(4/22 Pages) NSC

4 / 22 page

Pin Descriptions and Equivalent Circuits (Continued)

Pin No.

Symbol

Equivalent Circuit

Description

14–19,

22–27

D0–D11

Digital data output pins that make up the 12-bit conversion

results. D0 is the LSB, while D11 is the MSB of the offset

binary output word.

ANALOG POWER

5, 6, 29

Positive analog supply pins. These pins should be connected

to a quiet +3.3V source and bypassed to AGND with 0.1 µF

monolithic capacitors located within 1 cm of these power pins,

and with a 10 µF capacitor.

4, 7, 28

AGND

The ground return for the analog supply.

DIGITAL POWER

Positive digital supply pin. This pin should be connected to

the same quiet +3.3V source as is V

A and bypassed to

DGND with a 0.1 µF monolithic capacitor in parallel with a 10

µF capacitor, both located within 1 cm of the power pin.

Decouple this pin from the V

A pins.

9, 12

DGND

The ground return for the digital supply.

Positive digital supply pin for the ADC12L063’s output drivers.

This pin should be connected to a voltage source of +2.5V to

D and bypassed to DR GND with a 0.1 µF monolithic

capacitor. If the supply for this pin is different from the supply

used for V

A and VD, it should also be bypassed with a 10 µF

tantalum capacitor. The voltage at this pin should never

exceed the voltage on V

D. All bypass capacitors should be

located within 1 cm of the supply pin.

DR GND

The ground return for the digital supply for the ADC12L063’s

output drivers. This pin should be connected to the system

digital ground, but not be connected in close proximity to the

ADC12L063’s DGND or AGND pins. See Section 5.0 (Layout

and Grounding) for more details.

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