ADS7844 Datasheet, PDF (1/14 Pages) Burr-Brown (TI) – 12-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER

®
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 V_CC, providing a corresponding input voltage
range of 0V to V_REF. 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
V_REF
Eight
Channel
Multiplexer
SAR
CDAC
Comparator
Serial
Interface
and
Control
DCLK
CS
SHDN
DIN
DOUT
BUSY
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©_{1998 Burr-Brown Corporation}
PDS-1463D
Printed in U.S.A. July, 1999