ADC12040CIVY datasheet(4/20 Pages) NSC

Part #	ADC12040CIVY

Description	12-Bit, 40 MSPS, 340 mW A/D Converter with Internal Sample-and-Hold

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Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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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. Output levels are TTL/CMOS compatible.

ANALOG POWER

5, 6, 29

V

A

Positive analog supply pins. These pins should be connected

to a quiet +5V voltage 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

13

V

D

Positive digital supply pin. This pin should be connected to

the same quiet +5V 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.

21

V

DR

Positive digital supply pin for the ADC12040’s output drivers.

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

+5V 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. V

DR should never exceed the voltage on

V

D. All bypass capacitors should be located within 1 cm of the

supply pin.

20

DR GND

The ground return for the digital supply for the ADC12040’s

output drivers. This pin should be connected to the system

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

ADC12040’s DGND or AGND pins. See Section 5 (Layout

and Grounding) for more details.

www.national.com

4

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