ADS1254
ADS
125
4
SBAS213 – JUNE 2001
24-Bit, 20kHz, Low Power
ANALOG-TO-DIGITAL CONVERTER
FEATURES
q
24 BITS—NO MISSING CODES
q
19 BITS EFFECTIVE RESOLUTION UP TO
20kHz DATA RATE
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LOW NOISE: 1.8ppm
q
FOUR DIFFERENTIAL INPUTS
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INL: 15ppm (max)
q
EXTERNAL REFERENCE (0.5V to 5V)
q
POWER-DOWN MODE
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SYNC MODE
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LOW POWER: 4mW at 20kHz
q
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 reso-
lution. The delta-sigma architecture is used for wide dy-
namic range and to ensure 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 ADS1254 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 ADS1254 is a multi-channel converter and is offered in
an SSOP-20 package.
APPLICATIONS
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CARDIAC DIAGNOSTICS
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DIRECT THERMOCOUPLE INTERFACES
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BLOOD ANALYSIS
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INFRARED PYROMETERS
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LIQUID/GAS CHROMATOGRAPHY
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PRECISION PROCESS CONTROL
ADS1254
CH1+
CH1–
CH2+
CH2–
Mux
CH3+
CH3–
CH4+
CH4–
Control
4th-Order
∆Σ
Modulator
Digital
Filter
Serial
Interface
SCLK
DOUT/DRDY
AV
DD
AGND
DV
DD
DGND
V
REF
CLK
CHSEL0 CHSEL1
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.
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, Texas Instruments Incorporated
www.ti.com
BURR-BROWN [ BURR-BROWN CORPORATION ]
