ADC12281

12-Bit, 20 MSPS Single-Ended Input, Pipelined A/D

Converter

General Description

The ADC12281 is a monolithic CMOS analog-to-digital con-

verter capable of converting analog input signals into 12-bit

digital words at 20 megasamples per second (MSPS). It

utilizes a pipeline architecture to minimize die size and

power dissipation. Self-calibration and error correction main-

tain accuracy and performance over temperature.

The ADC12281 operates on a 5V power supply and can

digitize single-ended analog input signals in the range of 0V

to 2V. A single convert clock controls the conversion opera-

tion and all digital I/O is TTL compatible.

The ADC12881 is designed to minimize external compo-

nents necessary for the analog input interface. An internal

sample-and-hold circuit samples the single-ended analog

input and an internal amplifier buffers the reference voltage

input.

The Power Down feature reduces power consumption to

20 mW, typical.

The ADC12281 is available in the 32-lead TQFP package

and is designed to operate over the industrial temperature

range of −40˚C to +85˚C.

Features

n

Single 5V power supply

n

Single-ended analog input

n

Internal sample-and-hold

n

Internal reference buffer amplifier

n

Low offset and gain errors

Key Specifications

n

Resolution

12 bits

n

Conversion rate

up to 20 MSPS

n

DNL

0.35 LSB (typ)

n

SNR

65.5 dB (typ)

n

ENOB

10.5 bits (typ)

n

Analog input range

2 V

n

Supply voltage

n

Power consumption, 20 MHz

443 mW (typ)

Applications

n

Digital signal processing front end

n

Digital television

n

Radar

n

High speed data links

n

Waveform digitizers

n

Quadrature demodulation

Connection Diagram

10102701

32-Lead TQFP Package

Order Number ADC12281CIVT

See NS Package Number VBE32A

November 2002

© 2002 National Semiconductor Corporation

DS101027

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