Rainbow Electronics ADC12662 - Manual

TL H 11876
ADC12662
12-Bit
15
MHz
200
mW
AD
Converter
with
Input
Multiplexer
and
SampleHold
December 1994
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 a5V supply
The
ADC12662 performs a 12-bit conversion in three lower-res-
olution ‘‘flash’’ conversions yielding a fast A D without the
cost and power dissipation associated with true flash ap-
proaches
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 feature
two sample-and-hold flash comparator sections which al-
low the converter to acquire one sample while converting
the previous This pipelining technique increases conver-
sion speed without sacrificing performance The multiplexer
output 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 mW
Features
Y Built-in sample-and-hold
Y Single a5V supply
Y Single channel or 2 channel multiplexer operation
Y Low Power Standby mode
Key Specifications
Y Sampling rate 1 5 MHz (min)
Y Conversion time 580 ns (typ)
Y Signal-to-Noise Ratio f
IN e 100 kHz 67 5 dB (min)
Y Power dissipation (f s e 1 5 MHz) 200 mW (max)
Y No missing codes over temperature Guaranteed
Applications
Y Digital signal processor front ends
Y Instrumentation
Y Disk drives
Y Mobile telecommunications
Y Waveform digitizers
ADC12662 Block Diagram
TL H 11876 – 1
Ordering Information
Industrial (b40 C s T A s a 85 ) Package
ADC12662CIV V44 Plastic Leaded Chip Carrier
ADC12662CIVF VGZ44A Plastic Quad Flat Package
ADC12062EVAL Evaluation Board
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation RRD-B30M75 Printed in U S A