ADC12662 datasheet(1/23 Pages) NSC

Part #	ADC12662

Description	12-Bit, 1.5 MHz, 200 mW A/D Converter with Input Multiplexer and Sample/Hold

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Manufacturer	NSC [National Semiconductor (TI)]

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ADC12662

12-Bit, 1.5 MHz, 200 mW A/D Converter

with Input Multiplexer and Sample/Hold

General Description

Using an innovative multistep conversion technique, the

12-bit ADC12662 CMOS analog-to-digital converter digitizes

signals at a 1.5 MHz sampling rate while consuming a maxi-

mum of only 200 mW on a single +5V supply. The

ADC12662

performs

a

12-bit

conversion

in

three

lower-resolution “flash” conversions, yielding a fast A/D with-

out the cost and power dissipation associated with true flash

approaches.

The analog input voltage to the ADC12662 is tracked and

held by an internal sampling circuit, allowing high frequency

input signals to be accurately digitized without the need for

an external sample-and-hold circuit. The ADC12662 features

two sample-and-hold/flash comparator sections which allow

the converter to acquire one sample while converting the

previous. This pipelining technique increases conversion

speed without sacrificing performance. The multiplexer out-

put is available to the user in order to perform additional

external signal processing before the signal is digitized.

When the converter is not digitizing signals, it can be placed

in the Standby mode; typical power consumption in this

mode is 250 µW.

Features

n

Built-in sample-and-hold

n

Single +5V supply

n

Single channel or 2 channel multiplexer operation

n

Low Power Standby mode

Key Specifications

n

Sampling rate

1.5 MHz (min)

n

Conversion time

580 ns (typ)

n

Signal-to-Noise Ratio, f

IN= 100 kHz

67.5 dB (min)

n

Power consumption (f

s= 1.5 MHz)

200 mW (max)

n

No missing codes over temperature

Guaranteed

Applications

n

Digital signal processor front ends

n

Instrumentation

n

Disk drives

n

Mobile telecommunications

n

Waveform digitizers

ADC12662 Block Diagram

01187601

Ordering Information

Industrial (−40˚C

≤ T

A ≤ +85˚)

Package

ADC12662CIV

V44 Plastic Leaded Chip Carrier

ADC12662CIVF

VGZ44A Plastic Quad Flat Package

June 2001

DS011876

www.national.com

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ADC12662 Datasheet(PDF) 1 Page - National Semiconductor (TI)

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