Part A
ADS1252U/2K5
德州儀器
- Lifecycle
- Active
- Stock
- 6702 件
- Package
- SOIC-8
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS1231IDR and ADS1252U/2K5 are both 24-bit delta-sigma ADCs, but they differ fundamentally in resolution architecture, input configuration, interface, and package, so neither can serve as a direct drop-in substitute for the other. The ADS1231IDR is a single-channel, bridge-sensor-oriented ADC with an integrated low-noise PGA and simple two-wire serial interface in an SOIC-8 package, while the ADS1252U/2K5 is a high-speed single-channel ADC with a fixed-gain differential input and SPI-compatible interface in an SOIC-8 package. Designers must re-validate the analog front end, digital interface timing, and board layout before considering any substitution.
Different input architecture
Different digital interface
Different data rate class
Different reference scheme
Parts at a glance
Part B
ADS1231IDR
德州儀器
- Lifecycle
- Active
- Stock
- 4314 件
- Package
- SOIC-16
- Series
- 資料獲取-模數轉換器（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 | ADS1252U/2K5 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 1 (differential) | 1 (differential) | Both provide a single differential input, limiting them to one signal path per device. |
| Data rate (SPS) | 10 or 80 | Up to 41,667 | The ADS1252 supports much higher output rates, making it suitable for faster signals while the ADS1231 targets slow, high-precision measurements. |
| Interface | Serial (SPI-compatible, 2-wire) | Serial (SPI-compatible) | Both use a serial interface, but the ADS1231 uses a simpler 2-wire scheme while the ADS1252 uses a standard SPI-style interface. |
| Supply voltage | 2.7 V to 5.3 V | 4.75 V to 5.25 V | The ADS1231 operates over a wider low-voltage range, while the ADS1252 requires a nominal 5 V supply. |
| Internal PGA / gain | Yes (gain 128) | No | The ADS1231 includes a fixed gain of 128 for direct small-signal sensing, whereas the ADS1252 has no internal PGA and needs external conditioning. |
| Package | SOIC-16 | SOIC-8 | Different pin counts and footprints mean the two parts are not drop-in replacements on a PCB. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Both cover the same industrial temperature range, so environmental ratings do not differentiate them. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1252U/2K5 | ADS1231IDR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 40k | 80 |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 3V ~ 5.3V |
| Voltage - Supply, Digital | 5V | 3V ~ 5.3V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1231IDR and the ADS1252U/2K5?
The ADS1231IDR is a 24-bit delta-sigma ADC with an integrated low-noise PGA and a bridge excitation voltage reference, optimized for direct bridge sensor interfacing. The ADS1252U/2K5 is a 24-bit delta-sigma ADC without an integrated PGA, offering a fixed gain of 1 and requiring external signal conditioning. The ADS1231IDR provides a data rate of 10 SPS or 80 SPS, while the ADS1252U/2K5 supports programmable data rates up to 41.7 kSPS.
Are the ADS1231IDR and ADS1252U/2K5 pin-to-pin or package compatible?
No. The ADS1231IDR is supplied in an 8-pin SOIC (D) package, whereas the ADS1252U/2K5 is supplied in an 8-pin SOIC (U) package. Although both are 8-pin SOIC outlines, the pin functions and internal architecture differ, so they are not direct drop-in replacements. PCB land patterns and pin assignments must be verified against the respective datasheets before substitution.
Which device is better suited for direct bridge sensor applications?
The ADS1231IDR is specifically designed for bridge sensor applications because it integrates a low-noise PGA and an on-chip bridge excitation voltage reference, allowing direct connection of a Wheatstone bridge without external amplification or excitation circuitry. The ADS1252U/2K5 lacks an integrated PGA and excitation reference, so it requires external signal conditioning for bridge sensor interfacing.
How do the data output rates of the two ADCs compare?
The ADS1231IDR offers two selectable data rates: 10 SPS and 80 SPS. The ADS1252U/2K5 provides a programmable output data rate with a maximum of 41.7 kSPS. The ADS1252U/2K5 therefore supports significantly higher throughput, while the ADS1231IDR targets low-speed, high-resolution sensor measurements.
Do both devices support the same digital interface?
No. The ADS1231IDR uses a simple two-wire serial interface (SCLK and DOUT/DRDY) for data retrieval. The ADS1252U/2K5 uses a three-wire serial interface (SCLK, DOUT, and DRDY) with a dedicated data-ready signal. The interface timing and protocol differ, so firmware and host controller connections must be adapted accordingly.
What are the supply voltage requirements for each device?
The ADS1231IDR operates from a single analog supply of 2.7 V to 5.3 V and a digital supply of 2.7 V to 5.3 V. The ADS1252U/2K5 operates from a single 5 V analog supply and a 1.8 V to 3.3 V digital supply. Designs must account for these differences in supply rails and decoupling requirements.
Can the ADS1231IDR and ADS1252U/2K5 be used interchangeably in an existing design?
No. Due to differences in integrated features (PGA and excitation reference), package pin functions, digital interface protocol, supply requirements, and data rate capabilities, the two devices are not interchangeable without redesigning the analog front end, updating firmware, and verifying the PCB layout against the target datasheet.