ADC14L040 datasheet(4/23 Pages) NSC

4 / 23 page

Pin Descriptions and Equivalent Circuits (Continued)

Pin No.

Symbol

Equivalent Circuit

Description

12-19

22-27

D0–D13

Digital data output pins that make up the 14-bit conversion

result. D0 (pin 12) is the LSB, while D13 (pin 27) is the MSB of

the output word. Output levels are TTL/CMOS compatible.

Optimum loading is < 10pF.

ANALOG POWER

5, 29

Positive analog supply pins. These pins should be connected

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

capacitors located close to 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 be bypassed to DGND

with a 0.1 µF capacitor located close to the power pin and with

a 10 µF capacitor.

DGND

The ground return for the digital supply.

Positive driver supply pin for the ADC14L040’s output drivers.

This pin should be connected to a voltage source of +2.4V to

D 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

D, it should also be bypassed with a 10 µF capacitor. VDR

should never exceed the voltage on V

D. All 0.1 µF bypass

capacitors should be located close to the supply pin.

DR GND

The ground return for the digital supply for the ADC’s output

drivers. These pins should be connected to the system digital

ground, but not be connected in close proximity to the ADC’s

DGND or AGND pins. See Section 5 (Layout and Grounding)

for more details.

ADC14L040 Datasheet(PDF) 4 Page - National Semiconductor (TI)

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