24-Bit, 20kHz, Low Power
ANALOG-TO-DIGITAL CONVERTER
FEATURES
l 24 BITS—NO MISSING CODES
l 19 BITS EFFECTIVE RESOLUTION UP TO
20kHz DATA RATE
l LOW NOISE: 1.8ppm
l FOUR DIFFERENTIAL INPUTS
l INL: 15ppm (max)
l EXTERNAL REFERENCE (0.5V to 5V)
l POWER-DOWN MODE
l SYNC MODE
l LOW POWER: 8mW at 20kHz
5mW at 10kHz
DESCRIPTION
The ADS1253 is a precision, wide dynamic range, delta-
sigma, Analog-to-Digital (A/D) converter with 24-bit reso-
lution operating from a single +5V supply. The delta-sigma
architecture is used for wide dynamic range and to guarantee
24 bits of no missing codes performance. An effective
resolution of 19 bits (1.8ppm of rms noise) is achieved for
conversion rates up to 20kHz.
The ADS1253 is designed for high-resolution measurement
applications in cardiac diagnostics, smart transmitters, in-
dustrial process control, weight scales, chromatography, and
portable instrumentation. The converter includes a flexible,
two-wire synchronous serial interface for low-cost isolation.
The ADS1253 is a four-channel converter and is offered in
an SSOP-16 package.
APPLICATIONS
l CARDIAC DIAGNOSTICS
l DIRECT THERMOCOUPLE INTERFACES
l BLOOD ANALYSIS
l INFRARED PYROMETERS
l LIQUID/GAS CHROMATOGRAPHY
l PRECISION PROCESS CONTROL
ADS1253
SBAS199 – MAY 2001
www.ti.com
Copyright © 2001, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
ADS1253
4th-Order
DS
Modulator
Digital
Filter
Serial
Interface
Control
CLK
V
REF
SCLK
DOUT/DRDY
+V
DD
GND
ADS1253
Mux
CH1+
CH1–
CH2+
CH2–
CH3+
CH3–
CH4+
CH4–
CHSEL0 CHSEL1
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.