Rainbow Electronics ADC10464 - Manual

TL H 11108
ADC10461ADC10462ADC10464
10-Bit
600
ns
AD
Converter
with
Input
Multiplexer
and
SampleHold
December 1994
ADC10461 ADC10462 ADC10464 10-Bit 600 ns
A D Converter with Input Multiplexer and Sample Hold
General Description
Using an innovative patented multistep conversion tech-
nique the 10-bit ADC10461 ADC10462 and ADC10464
CMOS analog-to-digital converters offer sub-microsecond
conversion times yet dissipate a maximum of only 235 mW
The ADC10461 ADC10462 and ADC10464 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 Dy-
namic
performance (THD S N) is guaranteed The
ADC10461 is pin-compatible with the ADC1061 but much
faster thus providing a convenient upgrade path for the
ADC1061
The analog input voltage to the ADC10461 ADC10462 and
ADC10464 is sampled and held by an internal sampling cir-
cuit Input signals at frequencies from dc to over 200 kHz
can therefore be digitized accurately without the need for an
external sample-and-hold circuit
The ADC10462 and ADC10464 include a ‘‘speed-up’’ pin
Connecting an external resistor between this pin and ground
reduces the typical conversion time to as little as 350 ns
with only a small increase in linearity error
For ease of interface to microprocessors the ADC10461
ADC10462 and ADC10464 have been designed to appear
as a memory location or I O port without the need for exter-
nal interface logic
Features
Y Built-in sample-and-hold
Y Single a5V supply
Y 1 2 or 4-input multiplexer options
Y No external clock required
Y Speed adjust pin for faster conversions (ADC10462 and
ADC10464)
Key Specifications
Y Conversion time to 10 bits 600 ns typical
900 ns max over temperature
Y Sampling Rate 800 kHz
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
ADC10461
Industrial
Package
(b40 C s T A s a 85 C)
ADC10461CIN N20A Molded DIP
ADC10461CIWM M20B Small Outline
ADC10462
Industrial
Package
(b40 C s T A s a 85 C)
ADC10462CIN N24A Molded DIP
ADC10462CIWM M24B Small Outline
ADC10464
Industrial
Package
(b40 C s T A s a 85 C)
ADC10464CIN N28B Molded DIP
ADC10464CIWM 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