Datasheet
24-Bit, 20kHz, Low Power
ANALOG-TO-DIGITAL CONVERTER
FEATURES
● 24 BITS—NO MISSING CODES
● 19 BITS EFFECTIVE RESOLUTION UP TO
20kHz DATA RATE
● LOW NOISE: 1.8ppm
● FOUR DIFFERENTIAL INPUTS
● INL: 15ppm (max)
● EXTERNAL REFERENCE (0.5V to 5V)
● POWER-DOWN MODE
● SYNC MODE
● LOW POWER: 4mW at 20kHz
● SEPARATE DIGITAL INTERFACE SUPPLY 1.8V
to 3.6V
DESCRIPTION
The ADS1254 is a precision, wide dynamic range, delta-
sigma, Analog-to-Digital (A/D) converter with 24-bit resolu-
tion. The delta-sigma architecture is used for wide dynamic
range and to ensure 24 bits of no missing codes perfor-
mance. An effective resolution of 19 bits (1.8ppm of rms
noise) is achieved for conversion rates up to 20kHz.
The ADS1254 is designed for high-resolution measurement
applications in cardiac diagnostics, smart transmitters, indus-
trial process control, weight scales, chromatography, and
portable instrumentation. The converter includes a flexible,
two-wire synchronous serial interface for low-cost isolation.
The ADS1254 is a multi-channel converter and is offered in
an SSOP-20 package.
APPLICATIONS
● CARDIAC DIAGNOSTICS
● DIRECT THERMOCOUPLE INTERFACES
● BLOOD ANALYSIS
● INFRARED PYROMETERS
● LIQUID/GAS CHROMATOGRAPHY
● PRECISION PROCESS CONTROL
ADS1254
SBAS213B – JUNE 2001 – REVISED JUNE 2006
4th-Order
∆Σ
Modulator
Digital
Filter
Serial
Interface
Control
CLK
V
REF
SCLK
DOUT/DRDY
AV
DD
DV
DD
AGND
DGND
ADS1254
Mux
CH1+
CH1–
CH2+
CH2–
CH3+
CH3–
CH4+
CH4–
CHSEL0
CHSEL1
www.ti.com
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.
Copyright © 2001-2006, 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.
ADS1254
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