ADS7842
12-Bit, 4-Channel Parallel Output Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
l SINGLE SUPPLY: 2.7V to 5V
l 4-CHANNEL INPUT MULTIPLEXER
l UP TO 200kHz SAMPLING RATE
l FULL 12-BIT PARALLEL INTERFACE
l ±1 LSB INL AND DNL
l GUARANTEED NO MISSING CODES
l 72dB SINAD
l LOW POWER: 2mW
l SSOP-28 PACKAGE
®
DESCRIPTION
The ADS7842 is a complete, 4-channel, 12-bit analog-
to-digital converter (ADC). It contains a 12-bit, ca-
pacitor-based, SAR A/D with a sample-and-hold am-
plifier, interface for microprocessor use and parallel,
three-state output drivers. The ADS7842 is specified
at a 200kHz sampling rate while dissipating only
2mW of power. The reference voltage can be varied
from 100mV to V
CC
with a corresponding LSB reso-
lution from 24µV to 1.22mV. The ADS7842 is guar-
anteed down to 2.7V operation.
Low power, high speed and an on-board multiplexer
make the ADS7842 ideal for battery-operated sys-
tems such as portable, multi-channel dataloggers and
measurement equipment. The ADS7842 is available
in a SSOP-28 package and is guaranteed over the
–40°C to +85°C temperature range.
©
1998 Burr-Brown Corporation PDS-1484B Printed in U.S.A. March, 2000
APPLICATIONS
l DATA ACQUISITION
l TEST AND MEASUREMENT
l INDUSTRIAL PROCESS CONTROL
l MEDICAL INSTRUMENTS
l LABORATORY EQUIPMENT
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Twx: 910-952-1111 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
ADS7842
SAR
Output
Latches
and
Three
State
Drivers
Three
State
Parallel
Data Bus
Comparator
ADS7842
CS
WR
BUSY
CLK
RD
CDAC
V
REF
4-Channel
MUX
AIN2
AIN1
AIN0
A0 A1
AIN3
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