12-Bit/ 4-Channel Parallel Output Sampling ANALOG-TO-DIGITAL CONVERTER
Description
ADS7842
ADS7842
SBAS103C – SEPTEMBER 2000 – REVISED OCTOBER 2006
12-Bit, 4-Channel Parallel Output Sampling ANALOG-TO-DIGITAL CONVERTER
FEATURES
q SINGLE SUPPLY: 2.
7V to 5V q 4-CHANNEL INPUT MULTIPLEXER q UP TO 200kHz SAMPLING RATE q FULL 12-BIT PARALLEL INTERFACE q ±1LSB INL AND DNL q NO MISSING CODES q 72dB SINAD q LOW POWER: 2mW q SSOP-28 PACKAGE
APPLICATIONS
q DATA ACQUISITION q TEST AND MEASUREMENT q INDUSTRIAL PROCESS CONTROL q MEDICAL INSTRUMENTS q LABORATORY EQUIPMENT
DESCRIPTION
The ADS7842 is a complete, 4-channel, 12-bit Analog-toDigital Converter (ADC).
It contains a 12-bit, capacitorbased, Successive Approximation Register (SAR) ADC with a sample-and-hold amplifier, interface for microprocessor use, and parallel, 3-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 VCC with a corresponding LSB resolution from 24µV to 1.
22mV.
The ADS7842 is tested down to 2.
7V operation.
Low power, high speed, and an onboard multiplexer make the ADS7842 ideal for battery-operated systems such as portable, multi-channel dataloggers and measurement equipment.
The ADS7842 is available in an SSOP-28 package and is tested over the –40°C to +85°C temperature range.
AIN0 AIN1 AIN2 AIN3
VREF
A0 A1
4-Channel MUX
SAR
ADS7842
CDAC
Comparator
Output Latches
and 3-State Drivers
3-State Parallel Data Bus
CLK BUSY WR CS RD
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
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