ADS7844 Datasheet, PDF (1/22 Pages) Burr-Brown (TI) – 12-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER

ADS7844
ADS7844
ADS7844
SBAS100A – JANUARY 1998 – REVISED OCTOBER 2003
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 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 analog-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_REF) can be
varied between 100mV and V_CC, providing a corresponding
input voltage range of 0V to V_REF. The device includes a
shutdown mode that reduces power dissipation to under
1µW. The ADS7844 is ensured down to 2.7V operation.
Low power, high speed, and onboard multiplexer make the
ADS7844 ideal for battery-operated systems such as personal
digital assistants, portable multichannel 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
equivalent 20-lead SSOP package and is ensured 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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PRODUCTION DATA information is current as of publication date.
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standard warranty. Production processing does not necessarily include
testing of all parameters.
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