Part A
ADS1231IDR
Техасские инструменты
- Lifecycle
- Active
- Stock
- 4314 ПКС
- Package
- SOIC-16
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1231IDR and ADS1250UG4 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 on-chip oscillator, while the ADS1250UG4 is a 20-bit, single-channel, higher-speed delta-sigma ADC with a different serial interface and package. Their resolution, conversion rate, interface timing, and package footprint differ substantially, so a direct substitution is not feasible without a full system redesign.
Different resolution
Different conversion rate
Different package
Different interface timing
Parts at a glance
Part B
ADS1250UG4
Техасские инструменты
- Lifecycle
- Active
- Stock
- 6997 ПКС
- Package
- SOIC-16
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | ADS1250UG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 20 | Higher resolution enables finer measurement of small signal changes; a 24-bit ADC provides significantly more precision than a 20-bit device. |
| Number of input channels | 1 (differential) | 1 (differential) | Both are single-channel differential devices, so channel count is not a differentiator for substitutability. |
| Interface type | SPI (2-wire, read-only) | SPI (serial) | Interface compatibility determines whether the part can drop into an existing digital bus; differing SPI implementations may require firmware changes. |
| Data rate (SPS) | 10 / 80 | Up to 40k | Maximum sample rate dictates achievable measurement bandwidth; the ADS1250 supports much faster sampling than the ADS1231. |
| Supply voltage (analog) | 2.7 V to 5.3 V | 5 V (single supply) | Supply range affects system power design; the wider range of the ADS1231 allows lower-voltage operation. |
| Input type / PGA | Integrated PGA (gain 1/2/64/128) | No integrated PGA | An integrated PGA allows direct connection of low-level sensors without external amplification, simplifying the signal chain. |
| Package | SOIC-8 | SOIC-16 | Package footprint and pin count must match the PCB layout; different packages are not drop-in compatible. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the industrial temperature range, so environmental suitability is equivalent. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1231IDR | ADS1250UG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 20 |
| Sampling Rate(Per Second) | 80 | 25k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | ADC | PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| 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 the ADS1250UG4?
The ADS1231IDR is a 24-bit, single-channel delta-sigma ADC optimized for weigh scales and bridge sensors, integrating a low-noise PGA with gains of 1 or 128. The ADS1250UG4 is a 20-bit, single-channel delta-sigma ADC with a fixed gain of 1 and a programmable data rate up to 40 kSPS, designed for general-purpose high-resolution signal acquisition. They differ in resolution, gain architecture, and target application.
Are the ADS1231IDR and ADS1250UG4 pin-compatible or package-compatible?
No. The ADS1231IDR is supplied in an 8-pin SOIC (D) package, while the ADS1250UG4 is supplied in a 16-pin SOIC (DW) package. Pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
What are the maximum output data rates of these two ADCs?
The ADS1231IDR provides a fixed 10 SPS or 80 SPS output data rate selectable via a pin, targeting low-noise weigh-scale measurements. The ADS1250UG4 supports a programmable output data rate up to 40 kSPS, making it suitable for higher-speed signal acquisition.
Do both devices include an integrated programmable gain amplifier (PGA)?
The ADS1231IDR includes an integrated low-noise PGA with selectable gains of 1 or 128, intended for direct connection to bridge sensors. The ADS1250UG4 does not provide a programmable gain amplifier; it operates with a fixed gain of 1, so external amplification is required for low-level signals.
What are the supply voltage requirements for the ADS1231IDR and ADS1250UG4?
The ADS1231IDR operates from a single analog supply of 2.7 V to 5.3 V. The ADS1250UG4 operates from a single 5 V analog supply. Designs must verify supply rails and decoupling against the respective datasheets before substitution.
Which device is better suited for weigh-scale or bridge-sensor applications?
The ADS1231IDR is specifically optimized for weigh scales and bridge sensors, offering 24-bit resolution, an integrated gain-of-128 PGA, and low-noise 10 SPS or 80 SPS data rates. The ADS1250UG4, with 20-bit resolution, fixed gain of 1, and up to 40 kSPS, is better suited to general-purpose higher-speed acquisition rather than direct bridge-sensor interfacing.
Can the ADS1231IDR and ADS1250UG4 be substituted for each other in an existing design?
No direct substitution is possible. Differences in resolution (24-bit vs 20-bit), gain architecture (PGA vs fixed gain), package (8-pin SOIC vs 16-pin SOIC), data rate, and supply requirements mean the PCB, firmware, and signal chain must be redesigned and revalidated against the respective manufacturer datasheets.