24-Bit, 80SPS, 2-Ch (Differential), Pin-Programmable Delta-Sigma ADC for Bridge Sensors
Product details
Parameters
Package | Pins | Size
Features
- Complete front-end for bridge sensors
- 23.5-bits effective resolution at gain = 1
- 19.2-bits noise-free resolution at gain = 64
- Low-noise PGA
- Selectable gains of 1, 2, 64, and 128
- RMS noise:
- 17 nV at 10 SPS at gain = 128
- 44 nV at 80 SPS at gain = 128
- 100-dB simultaneous 50-Hz and 60-Hz rejection
- Flexible clocking:
- Low-drift internal oscillator
- Optional external crystal
- Selectable 10-SPS or 80-SPS data rates
- Easy ratiometric measurements:
- External voltage reference up to 5 V
- Two-channel differential input with internal temperature sensor (ADS1232)
- Four-channel differential input (ADS1234)
- Two-wire serial interface
- Supply voltage range: 2.7 V to 5.3 V
- Temperature range: –40°C to +105°C
- Packages: TSSOP-24 (ADS1232) or TSSOP-28 (ADS1234)
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Description
The ADS1232 and ADS1234 (ADS123x) are precision, 24-bit, analog-to-digital converters (ADCs). With a low-noise programmable gain amplifier (PGA), a precision delta-sigma ADC, and internal oscillator, the ADS123x provide a complete front-end solution for bridge sensor applications including weigh scales, strain gauges, and pressure sensors.
An input multiplexer (MUX) accepts either two (ADS1232) or four (ADS1234) differential inputs. The ADS1232 also includes a temperature sensor to monitor ambient temperature. The low-noise PGA has a selectable gain of 1, 2, 64, or 128, supporting a full-scale differential input of ±2.5 V, ±1.25 V, ±39 mV, or ±19.5 mV.
The delta-sigma ADC provides a maximum of 23.5-bits effective resolution, and supports two data rates: 10 SPS (providing 50-Hz and 60-Hz rejection) and 80 SPS. The ADS123x can be clocked externally using an oscillator or a crystal, or by the internal oscillator.
Offset calibration is performed on-demand, and the ADS123x can be put in a low-power standby mode or shut off completely in power-down mode. The ADS123x are operated through simple pin-driven control—there are no digital registers to program.
Data are output over a two-wire serial interface that connects directly to the MSP430 and other microcontrollers.
Technical documentation
| Type | Title | Date | |
|---|---|---|---|
| * | Data sheet | ADS123x 2- and 4-Channel, 24-Bit, Delta-Sigma ADCs for Bridge Sensors datasheet (Rev. G) | Jan. 29, 2021 |
| E-book | Fundamentals of Precision ADC Noise Analysis | Jun. 19, 2020 | |
| Application note | Digital Filter Types in Delta-Sigma ADCs | Jun. 27, 2017 | |
| E-book | Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs | Mar. 19, 2015 | |
| Application note | Delta-Sigma ADC Design for Bridge Sensor Applications | Sep. 30, 2011 | |
| User guide | ADS1232REF User's Guide (Rev. B) | Jul. 14, 2011 | |
| White paper | Complete Front End Solutions for Weigh Scales | Jun. 14, 2007 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
The ADS1232REF is a circuit board that is designed to feature the ADS1232 24-bit delta-sigma, precision low noise, analog-to digital converter. This board contains the entire circuitry and user interface needed for a weigh-scale digitizer. It is suitable for the general evaluation of the ADS1232 (...)
Features
- USB connection for firmware updates and remote control
- Power is applied by either a 9V battery or wall plug 9V adapter
- Connections for load cells and other voltage sources
- Designed for very low power consumption
- Eight-digit starburst LCD readout
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Features
- Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
- Noise calculations
- Common unit translation
- Solves common amplifier circuit design problems
- Gain selections using standard resistors
- Filter configurations
- Total noise for common amplifier configurations
- (...)
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| TSSOP (PW) | 24 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
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