Part A
ADS1271IBPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2069 PCS
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1281IPW and ADS1271IBPW are both 24-bit delta-sigma ADCs in a TSSOP-24 package, but they differ in resolution architecture, data rate, and interface timing. The ADS1281IPW offers higher resolution and lower noise for seismic and precision applications, while the ADS1271IBPW provides a wider selectable data-rate range. Designers should validate clock, interface, and reference requirements before substituting one for the other.
Resolution and Architecture
Validation required
Data Rate
Validation required
Package Type
High match
Digital Interface
Validation required
Parts at a glance
Part B
ADS1281IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 4383 PCS
- Package
- TSSOP-24
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS1281IPW | ADS1271IBPW | Why it matters |
|---|---|---|---|
| Resolution (bits) | 31 | 24 | Higher resolution provides finer measurement granularity and lower quantization noise, which is critical for high-dynamic-range seismic and precision instrumentation applications. |
| Architecture | Delta-Sigma (2nd order) | Delta-Sigma | The modulator architecture affects noise shaping, linearity, and achievable dynamic range; different architectures are not drop-in equivalent in performance. |
| Max Sample Rate (SPS) | 4000 | 105000 | Sample rate determines the usable signal bandwidth; the ADS1271 supports much higher throughput for wideband industrial measurement, while the ADS1281 targets lower-rate high-resolution seismic work. |
| Input Type | Differential | Differential | Both use differential inputs for common-mode rejection, but input range and configuration differ, affecting sensor interfacing. |
| Supply Voltage (Analog) | 5 V (analog), 3.3 V (digital) | 5 V (analog), 1.8 V to 3.3 V (digital) | Supply requirements affect board-level power design and logic-level compatibility with the host controller. |
| Interface | SPI (serial) | SPI (serial) | Both use SPI, but frame format, word length, and timing differ, so firmware must be adapted when substituting. |
| Package | TSSOP-24 | TSSOP-24 | Matching package footprint allows the same PCB land pattern, but pinout differences must still be verified before substitution. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +105°C | The wider temperature range of the ADS1271 supports harsher industrial environments, while the ADS1281 is limited to standard industrial range. |
| Typical Application Focus | Seismic and energy exploration, high-resolution instrumentation | Industrial measurement, vibration analysis, data acquisition | Target application determines whether noise, bandwidth, and resolution trade-offs are acceptable for functional substitutability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1271IBPW | ADS1281IPW |
|---|---|---|
| Part Status | Active | Active |
| Base Product Number | ADS1271 | - |
| Number of Bits | 24 | 31 |
| Sampling Rate (Per Second) | 105k | - |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | ADC | ADC |
| Number of A / D Converters | 1 | - |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | 1.65V ~ 3.6V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | - |
| Packaging | Tube | - |
| Sampling Rate(Per Second) | - | 4k |
| Number of A/D Converters | - | 1 |
Frequently asked questions
What are the primary differences between the ADS1281IPW and ADS1271IBPW?
The ADS1281IPW is a 31-bit delta-sigma ADC with a maximum data rate of 4 kSPS, designed for high-resolution seismic and energy exploration applications, featuring a programmable gain amplifier and operating from a 5 V analog supply. The ADS1271IBPW is a 24-bit delta-sigma ADC with data rates up to 105 kSPS, designed for wide-bandwidth industrial measurement, and operates from a 5 V analog supply with a different digital filter architecture. They differ in resolution, maximum data rate, and target application space.
Are the ADS1281IPW and ADS1271IBPW pin-compatible?
No. Both devices are offered in a 24-pin TSSOP (PW) package, but their pin functions and internal architectures differ. The ADS1281IPW includes dedicated pins for a programmable gain amplifier input and different digital interface timing, while the ADS1271IBPW has its own pinout for its modulator and filter configuration. They are not drop-in replacements for each other.
What are the maximum data rates of the ADS1281IPW and ADS1271IBPW?
The ADS1281IPW supports data rates up to 4 kSPS in its high-resolution mode. The ADS1271IBPW supports data rates up to 105 kSPS in high-speed mode, with lower rates available in high-resolution and low-power modes.
What resolution does each ADC provide?
The ADS1281IPW is a 31-bit delta-sigma ADC. The ADS1271IBPW is a 24-bit delta-sigma ADC. The higher bit depth of the ADS1281IPW supports lower noise and finer resolution for low-frequency signals, while the ADS1271IBPW provides 24-bit resolution at higher throughput.
Do both devices support the same analog supply voltage?
Yes. Both the ADS1281IPW and ADS1271IBPW operate from a 5 V analog supply (AVDD). However, their digital supply and interface voltage requirements should be verified against the respective datasheets, as the ADS1281IPW and ADS1271IBPW may specify different DVDD ranges and logic levels.
Which device is better suited for seismic or low-frequency precision measurement?
The ADS1281IPW is specifically designed for seismic and energy exploration applications, offering 31-bit resolution and a maximum 4 kSPS data rate with an integrated PGA. The ADS1271IBPW, with 24-bit resolution and up to 105 kSPS, is oriented toward wider-bandwidth industrial measurement. For low-frequency, high-resolution seismic sensing, the ADS1281IPW is the intended choice.
Can the ADS1271IBPW be used as a replacement for the ADS1281IPW in an existing design?
No, not without redesign. The devices differ in resolution (24-bit vs 31-bit), maximum data rate (105 kSPS vs 4 kSPS), pinout, and digital filter characteristics. A direct substitution would require validating timing, interface, and signal-chain performance against the original design requirements and the ADS1271IBPW datasheet.