adc12662civf National Semiconductor Corporation, adc12662civf Datasheet

adc12662civf

Manufacturer Part Number

adc12662civf

Description

12-bit, 1.5 Mhz, 200 Mw A/d Converter With Input Multiplexer And Sample/hold

Manufacturer

National Semiconductor Corporation

Datasheet

1.ADC12662CIVF.pdf (23 pages)

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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

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.

ADC12662 Block Diagram

Ordering Information

performs

Industrial (−40˚C

ADC12662CIV

ADC12662CIVF

12-bit

conversion

DS011876

+85˚)

three

VGZ44A Plastic Quad Flat Package

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

n Conversion time

n Signal-to-Noise Ratio, f

n Power consumption (f

n No missing codes over temperature

Applications

n Digital signal processor front ends

n Instrumentation

n Disk drives

n Mobile telecommunications

n Waveform digitizers

V44 Plastic Leaded Chip Carrier

Package

= 1.5 MHz)

= 100 kHz

01187601

200 mW (max)

1.5 MHz (min)

67.5 dB (min)

www.national.com

580 ns (typ)

Guaranteed

June 2001

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