Part A
ADS1210U
Texas Instruments
- Lifecycle
- Active
- Stock
- 5384 PCS
- Package
- SOIC-8
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1231IDR and ADS1210U 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 internal oscillator, while the ADS1210U is a 24-bit, single-channel, higher-speed delta-sigma ADC with a programmable gain amplifier, SPI-compatible serial interface, and a wider supply range. Their differences in resolution architecture, interface, package, and supply requirements mean a direct substitution is not feasible without redesign.
Different interface type
Different package footprint
Different supply voltage range
Different data rate capability
Parts at a glance
Part B
ADS1231IDR
Texas Instruments
- Lifecycle
- Active
- Stock
- 4314 PCS
- Package
- SOIC-16
- 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 | ADS1210U | 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. |
| Input type | Differential | Differential | Differential inputs improve noise rejection for low-level sensor signals in both parts. |
| Data interface | SPI (2-wire, read-only) | SPI (serial) | Interface compatibility affects whether the part can drop into an existing digital bus without firmware changes. |
| Supply voltage (analog) | 2.7 V to 5.3 V | 5 V (single 5 V supply) | The wider supply range of the ADS1231IDR allows low-voltage operation, while the ADS1210U requires a 5 V rail. |
| Package | SOIC-16 (D) | SOIC-18 (U) | Different package pin counts and footprints prevent direct board-level substitution without layout changes. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial environments. |
| PGA / gain stages | Fixed gain 128 (integrated PGA) | Programmable gain 1 to 16 | The ADS1210U offers adjustable gain for varied signal amplitudes, while the ADS1231IDR is fixed for low-level bridge sensors. |
| Data rate (max) | 80 SPS | 10 SPS to 1 kSPS (programmable) | The ADS1210U supports higher and programmable output rates, affecting throughput and noise trade-offs. |
| Internal oscillator / clock | Internal oscillator | Requires external clock | The ADS1231IDR simplifies design with an on-chip oscillator, whereas the ADS1210U needs an external clock source. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1210U | ADS1231IDR |
|---|---|---|
| Part Status | Last Time Buy | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 16k | 80 |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | PGA-ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal | External |
| Voltage - Supply, Analog | 5V | 3V ~ 5.3V |
| Voltage - Supply, Digital | 5V | 3V ~ 5.3V |
| 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 ADS1210U?
The ADS1231IDR is a 24-bit, single-channel, low-noise analog-to-digital converter designed specifically for weigh-scale and bridge-sensor applications, integrating a low-noise PGA and an on-chip oscillator. The ADS1210U is a 24-bit, single-channel, delta-sigma ADC with a programmable gain amplifier and a flexible serial interface, but it does not include the integrated low-noise PGA and oscillator optimized for bridge sensors that the ADS1231 provides. The ADS1231IDR is factory-calibrated for gain and offset, whereas the ADS1210U requires external calibration routines.
Are the ADS1231IDR and ADS1210U pin-compatible or package-compatible?
No. The ADS1231IDR is supplied in an 8-pin SOIC (D) package, while the ADS1210U is supplied in a 16-pin SOIC (DW) package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for one another.
Do the ADS1231IDR and ADS1210U support the same supply voltage range?
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 ADS1210U operates from a single supply of 2.7 V to 5.5 V. While the ranges overlap, the specified maximum differs (5.3 V vs. 5.5 V), so designs should be validated against the respective datasheet limits.
How do the data output rates of the ADS1231IDR and ADS1210U compare?
The ADS1231IDR provides a fixed output data rate of 10 SPS or 80 SPS, selectable via the SPEED pin. The ADS1210U offers a programmable output data rate from 0.0015 kSPS to 15.6 kSPS, configured through its internal registers. The ADS1210U therefore offers a much wider and finer range of data rates, while the ADS1231IDR is optimized for low-speed, high-resolution weigh-scale measurements.
Which device is better suited for bridge-sensor or weigh-scale applications?
The ADS1231IDR is specifically designed for weigh-scale and bridge-sensor applications, featuring an integrated low-noise PGA, an on-chip oscillator, and factory calibration for gain and offset, which simplifies the signal chain. The ADS1210U is a more general-purpose 24-bit ADC with a programmable gain amplifier and flexible digital interface, requiring additional external components and calibration for bridge-sensor use. For a minimal-component weigh-scale design, the ADS1231IDR is the more integrated choice.
Do both devices offer an integrated programmable gain amplifier (PGA)?
Yes, both devices include a PGA. The ADS1231IDR has a fixed gain of 128, optimized for low-level bridge-sensor signals. The ADS1210U features a programmable gain amplifier with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128, offering greater flexibility across a wider range of input signal amplitudes.
How do the digital interfaces of the ADS1231IDR and ADS1210U differ?
The ADS1231IDR uses a simple two-wire serial interface consisting of a data line (DOUT/DRDY) and a clock line (SCLK), with no configuration registers required. The ADS1210U uses a more complex serial peripheral interface with separate DIN, DOUT, SCLK, and CS lines, and includes internal registers for configuration, calibration, and data-rate control. The ADS1231IDR interface is simpler to implement, while the ADS1210U offers greater configurability.
Are the ADS1231IDR and ADS1210U interchangeable in an existing design?
No. Due to differences in package pinout (8-pin vs. 16-pin SOIC), supply voltage maximums, data-rate architecture, PGA configurability, and digital interface protocol, the two devices are not interchangeable without a redesign of the PCB, firmware, and signal chain. Each part should be selected based on the specific application requirements documented in the respective manufacturer datasheets.