ADS1231 Converter Datasheet

ADS1231 Datasheet, PDF, Equivalent


Part Number

ADS1231

Description

24-Bit Analog-to-Digital Converter

Manufacture

etcTI

Total Page 23 Pages
Datasheet
Download ADS1231 Datasheet


ADS1231
ADS1231
www.ti.com
SBAS414D – JULY 2009 – REVISED OCTOBER 2013
24-Bit Analog-to-Digital Converter
for Bridge Sensors
Check for Samples: ADS1231
FEATURES
1
2 Complete Front-End for Bridge Sensors
• Internal Amplifier, Gain of 128
• Internal Oscillator
• Low-Side Power Switch for Bridge Sensor
• Low Noise: 35nVrms
• Selectable Data Rates: 10SPS or 80SPS
• Simultaneous 50Hz and 60Hz Rejection at
10SPS
• Input EMI Filter
• External Voltage Reference up to 5V for
Ratiometric Measurements
• Simple, Pin-Driven Control
• Two-Wire Serial Digital Interface
• Supply Range: 3V to 5.3V
• Package: SOIC-16
• Temperature Range: –40°C to +85°C
APPLICATIONS
• Weigh Scales
• Strain Gauges
• Load Cells
• Industrial Process Control
DESCRIPTION
The ADS1231 is a precision, 24-bit analog-to-digital
converter (ADC). With an onboard low-noise
amplifier, onboard oscillator, precision third-order 24-
bit delta-sigma (ΔΣ) modulator, and bridge power
switch, the ADS1231 provides a complete front-end
solution for bridge sensor applications including
weigh scales, strain gauges, and load cells.
The low-noise amplifier has a gain of 128, supporting
a full-scale differential input of ±19.5mV. The ΔΣ ADC
has 24-bit resolution and is comprised of a third-order
modulator and fourth-order digital filter. Two data
rates are supported: 10SPS (with both 50Hz and
60Hz rejection) and 80SPS. The ADS1231 can be
put in a low-power standby mode or shut off
completely in power-down mode.
The ADS1231 is controlled by dedicated pins; there
are no digital registers to program. Data are output
over an easily-isolated serial interface that connects
directly to the MSP430 and other microcontrollers.
The ADS1231 is available in an SO-16 package and
is specified from –40°C to +85°C.
AVDD
CAP CAP VREFP VREFN DVDD
AINP
AINN
EMI G = 128
Filter
24-Bit
DS ADC
PDWN
DRDY/DOUT
SCLK
SW
GND
Internal
Oscillator
CLKIN
SPEED
1
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.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009–2013, Texas Instruments Incorporated

ADS1231
ADS1231
SBAS414D – JULY 2009 – REVISED OCTOBER 2013
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ORDERING INFORMATION
For the most current package and ordering information, see the Package Option Addendum at the end of this
document, or visit the device product folder at www.ti.com.
ABSOLUTE MAXIMUM RATINGS(1)
Over operating free-air temperature range, unless otherwise noted.
AVDD to GND
DVDD to GND
Input current
Analog input voltage to GND
Digital input voltage to GND
ESD (2)
Human body model (HBM)
JEDEC standard 22, test method A114-C.01, all pins
Charged device model (CDM)
JEDEC standard 22, test method C101, all pins
Maximum junction temperature
Operating temperature range
Storage temperature range
ADS1231
–0.3 to +6
–0.3 to +6
100, momentary
10, continuous
–0.3 to AVDD + 0.3
–0.3 to DVDD + 0.3
±2000
±500
+150
–40 to +85
–60 to +150
UNIT
V
V
mA
mA
V
V
V
V
°C
°C
°C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated is not implied. Exposure to absolute-
maximum-rated conditions for extended periods may affect device reliability.
(2) CAUTION: ESD sensitive device. Precaution should be used when handling the device in order to prevent permanent damage.
THERMAL INFORMATION
THERMAL METRIC(1)
ADS1231
SOIC (D)
UNITS
16 PINS
θJA
θJCtop
θJB
ψJT
ψJB
θJCbot
Junction-to-ambient thermal resistance
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
79.5
37.5
37.1
°C/W
5.6
36.7
n/a
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
2 Submit Documentation Feedback
Product Folder Links: ADS1231
Copyright © 2009–2013, Texas Instruments Incorporated


Features ADS1231 www.ti.com SBAS414D – JULY 2 009 – REVISED OCTOBER 2013 24-Bit Ana log-to-Digital Converter for Bridge Sen sors Check for Samples: ADS1231 FEATUR ES 1 •2 Complete Front-End for Bridge Sensors • Internal Amplifier, Gain o f 128 • Internal Oscillator • Low-S ide Power Switch for Bridge Sensor • Low Noise: 35nVrms • Selectable Data Rates: 10SPS or 80SPS • Simultaneous 50Hz and 60Hz Rejection at 10SPS • In put EMI Filter • External Voltage Ref erence up to 5V for Ratiometric Measure ments • Simple, Pin-Driven Control Two-Wire Serial Digital Interface • Supply Range: 3V to 5.3V • Package: SOIC-16 • Temperature Range: –40°C to +85°C APPLICATIONS • Weigh Scale s • Strain Gauges • Load Cells • Industrial Process Control DESCRIPTION The ADS1231 is a precision, 24-bit ana log-to-digital converter (ADC). With an onboard low-noise amplifier, onboard o scillator, precision third-order 24bit delta-sigma (ΔΣ) modulator, and bridge power switch, the ADS1231 provides a complete front-end solution for.
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