Part A
ADS1231IDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 4314 PCS
- Package
- SOIC-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1231IDR and ADS1211UG4 are not drop-in replacements for one another. The ADS1231IDR is a 24-bit, single-channel, low-speed delta-sigma ADC with an integrated low-noise PGA and a simple two-wire interface, while the ADS1211UG4 is a 24-bit, four-channel, higher-speed delta-sigma ADC with a configurable PGA and a full SPI-compatible serial interface. Their channel count, digital interface, package footprint, and target application profiles differ substantially, so a direct board-level substitution is not feasible without redesign.
Different channel count
Different digital interface
Different package footprint
Different sample rate class
Parts at a glance
Part B
ADS1211UG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 7896 PCS
- Package
- SOIC-24
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1231IDR | ADS1211UG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not distinguish them for substitutability. |
| Number of input channels | 1 (differential) | 4 (differential) | Channel count determines how many signal sources can be measured; the ADS1211 supports multi-channel systems while the ADS1231 is single-channel. |
| Interface type | Serial (2-wire, proprietary) | SPI-compatible serial | Interface compatibility affects whether the part can drop into an existing digital bus and firmware without redesign. |
| Input type / PGA | Fixed gain (128), bridge sensor optimized | Programmable gain amplifier (1 to 128) | A programmable gain amplifier allows adaptation to different sensor signal levels, whereas a fixed gain limits input range flexibility. |
| Data rate (SPS) | 10 or 80 | Up to 1000 (programmable) | Maximum sample rate determines achievable measurement bandwidth and affects noise versus speed trade-offs. |
| Supply voltage | 2.7 V to 5.3 V | 2.7 V to 5.25 V | Supply range must match the system rail; slight differences can matter at the extremes of the operating window. |
| Package | SOIC-8 | SOIC-24 | Package footprint and pin count directly affect PCB layout compatibility and cannot be substituted without board redesign. |
| Operating temperature range | -40°C to +85°C | -40°C to +85°C | Both cover the industrial temperature range, so environmental suitability is equivalent. |
| Typical application focus | Weigh scales, strain gauges, bridge sensors | Industrial process control, multi-channel data acquisition | Target application and internal signal chain optimization indicate whether the part fits the intended measurement topology. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1231IDR | ADS1211UG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 80 | 16k |
| Number of Inputs | 1 | 4 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | ADC | MUX-PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External, Internal |
| Voltage - Supply, Analog | 3V ~ 5.3V | 5V |
| Voltage - Supply, Digital | 3V ~ 5.3V | 5V |
| Features | - | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary functional differences between the ADS1231IDR and ADS1211UG4?
The ADS1231IDR is a 24-bit, single-channel, low-speed delta-sigma ADC optimized for weigh scales and bridge sensors, integrating a low-noise PGA and operating from a single 2.7 V to 5.3 V supply. The ADS1211UG4 is a 24-bit, 4-channel (2 differential/4 single-ended) delta-sigma ADC with a programmable gain amplifier, offering higher sample rates and a wider feature set, operating from a 5 V analog supply with a separate digital supply.
Are the ADS1231IDR and ADS1211UG4 pin-to-pin or package compatible?
No. The ADS1231IDR is supplied in an 8-pin SOIC (D) package, while the ADS1211UG4 is supplied in a 24-pin SOIC (DW) package. The pin counts, pin functions, and package footprints differ, so they are not drop-in replacements for each other.
How do the input channel configurations of the two ADCs compare?
The ADS1231IDR provides a single differential input channel intended for direct bridge-sensor connection. The ADS1211UG4 provides four input channels configurable as two differential or four single-ended inputs, allowing multiplexed measurement of multiple signals.
How do the supply voltage requirements of the ADS1231IDR and ADS1211UG4 differ?
The ADS1231IDR operates from a single analog supply of 2.7 V to 5.3 V. The ADS1211UG4 requires a 5 V analog supply (AVDD) and a separate digital supply (DVDD) in the 2.7 V to 5.25 V range, so it is not suited to a single low-voltage rail without level considerations.
Which device offers higher output data rates?
The ADS1211UG4 supports programmable output data rates up to approximately 1 kSPS depending on gain and mode settings, whereas the ADS1231IDR is a low-speed converter with a nominal output data rate of 10 SPS or 80 SPS selectable. The ADS1211UG4 is therefore better suited to applications requiring faster sampling.
Do both devices include a programmable gain amplifier (PGA)?
Yes. The ADS1231IDR includes a fixed low-noise PGA with a gain of 128, optimized for direct connection to low-level bridge sensors. The ADS1211UG4 includes a programmable gain amplifier with selectable gains (1, 2, 4, 8, 16, 32, 64, 128), offering greater flexibility across different input signal ranges.
What are the typical target applications for each device?
The ADS1231IDR is typically used in weigh scales, strain-gauge bridge sensors, and other low-frequency, high-resolution measurement applications. The ADS1211UG4 is used in industrial process control, multi-channel data acquisition, and instrumentation where multiple inputs and programmable gain are required.
Can the ADS1231IDR be used as a direct substitute for the ADS1211UG4 in an existing design?
No. Differences in package, pinout, channel count, supply requirements, and data rate mean the ADS1231IDR cannot directly replace the ADS1211UG4. Any substitution requires a full review of the schematic, PCB layout, firmware, and system-level specifications against the respective manufacturer datasheets.