Rainbow Electronics ADC10664 - Manual

TL H 11192
ADC10662ADC10664
10-Bit
360
ns
AD
Converter
with
Input
Multiplexer
and
SampleHold
January 1995
ADC10662 ADC10664 10-Bit 360 ns
A D Converter with Input Multiplexer and Sample Hold
General Description
Using an innovative patented multistep conversion tech-
nique the 10-bit ADC10662 and ADC10664 are 2- and 4-in-
put CMOS analog-to-digital converters offering sub-micro-
second conversion times yet dissipating a maximum of only
235 mW The ADC10662 and ADC10664 perform a 10-bit
conversion in two lower-resolution ‘‘flashes’’ thus yielding a
fast A D without the cost power dissipation and other
problems associated with true flash approaches In addition
to standard static performance specifications (Linearity
Full-Scale
Error etc ) dynamic performance (THD
S N) is guaranteed
The analog input voltage to the ADC10662 and ADC10664
is sampled and held by an internal sampling circuit Input
signals at frequencies from dc to over 250 kHz can there-
fore be digitized accurately without the need for an external
sample-and-hold circuit
The ADC10662 and ADC10664 include a ‘‘speed-up’’ pin
Connecting an external resistor between this pin and ground
reduces the typical conversion time to as little as 360 ns
For ease of interface to microprocessors the ADC10662
and ADC10664 have been designed to appear as a memory
location or I O port without the need for external interface
logic
Features
Y Built-in sample-and-hold
Y Single a5V supply
Y 2- or 4-input multiplexer options
Y No external clock required
Key Specifications
Y Conversion time to 10 bits 360 ns typical
466 ns max over temperature
Y Sampling Rate 1 5 MHz (min)
Y Low power dissipation 235 mW (max)
Y Total harmonic distortion (50 kHz) b 60 dB (max)
Y No missing codes over temperature
Applications
Y Digital signal processor front ends
Y Instrumentation
Y Disk drives
Y Mobile telecommunications
Ordering Information
ADC10662
Industrial
Package
(b40 C s T A s a 85 C)
ADC10662CIN N24A Molded DIP
ADC10662CIWM M24B Small Outline
ADC10664
Industrial
Package
(b40 C s T A s a 85 C)
ADC10664CIN N28B Molded DIP
ADC10664CIWM M28B Small Outline
U S Patent Number 4918449
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation RRD-B30M75 Printed in U S A