® ADS7844
ADS7844
ADS7844
12-Bit, 8-Channel Serial Output Sampling
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q SINGLE SUPPLY: 2.7V to 5V
q 8-CHANNEL SINGLE-ENDED OR
4-CHANNEL DIFFERENTIAL INPUT
q UP TO 200kHz CONVERSION RATE
q ±1 LSB MAX INL AND DNL
q GUARANTEED NO MISSING CODES
q 72dB SINAD
q SERIAL INTERFACE
q 20-LEAD QSOP AND
20-LEAD SSOP PACKAGES
q ALTERNATE SOURCE FOR MAX147
APPLICATIONS
q DATA ACQUISITION
q TEST AND MEASUREMENT
q INDUSTRIAL PROCESS CONTROL
q PERSONAL DIGITAL ASSISTANTS
q BATTERY-POWERED SYSTEMS
DESCRIPTION
The ADS7844 is an 8-channel, 12-bit sampling ana-
log-to-digital converter (ADC) with a synchronous
serial interface. Typical power dissipation is 3mW at
a 200kHz throughput rate and a +5V supply. The
reference voltage (V ) can be varied between 100mV
REF
and VCC, providing a corresponding input voltage
range of 0V to VREF. The device includes a shutdown
mode which reduces power dissipation to under 1µW.
The ADS7844 is guaranteed down to 2.7V operation.
Low power, high speed, and on-board multiplexer
make the ADS7844 ideal for battery operated systems
such as personal digital assistants, portable multi-
channel data loggers, and measurement equipment.
The serial interface also provides low-cost isolation
for remote data acquisition. The ADS7844 is available
in a 20-lead QSOP package and the MAX147 equiva-
lent 20-lead SSOP package and is guaranteed over the
–40°C to +85°C temperature range.
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
COM
VREF
Eight
Channel
Multiplexer
SAR
CDAC
Comparator
Serial
Interface
and
Control
DCLK
CS
SHDN
DIN
DOUT
BUSY
International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111
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
©1998 Burr-Brown Corporation
PDS-1463D
Printed in U.S.A. July, 1999
