ADC12L080 datasheet(4/23 Pages) NSC

4 / 23 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 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

low ESL 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.

9, 12

DGND

The ground return for the digital supply.

Positive digital supply pin for the ADC12L080’s output drivers.

This pin should be connected to a voltage source in the range

indicated in the Operating Ratings table and be bypassed to

DR GND with a 0.1 µF 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 capacitor. The voltage at this pin

should never exceed the voltage on V

D by more than

300 mV. All bypass capacitors should be located within 1 cm

of the supply pin.

DR GND

The ground return for the digital supply for the ADC12L080’s

output drivers. This pin should be connected to the system

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

ADC12L080’s DGND or AGND pins. See Section 6.0 (Layout

and Grounding) for more details.

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