Part A
ADS1271IBPWR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6728 PCS
- Package
- TSSOP-16
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1271IBPWR and ADS1256IDBRG4 are both 24-bit delta-sigma ADCs in TSSOP-28 packages, but they differ in resolution architecture, channel count, and interface type. The ADS1256IDBRG4 offers higher resolution and more channels, while the ADS1271IBPWR provides a simpler single-channel design with a different digital interface. Designers should validate the interface compatibility and channel requirements before substituting.
Resolution
Validation required
Channel Count
Not compatible
Digital Interface
Validation required
Package Type
High match
Parts at a glance
Part B
ADS1256IDBRG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 7726 PCS
- Package
- SSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (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 | ADS1271IBPWR | ADS1256IDBRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for substitutability. |
| Maximum Sample Rate (SPS) | 105k | 30k | The ADS1271 supports a much higher throughput, which matters for wide-bandwidth or multiplexed high-speed acquisition. |
| Number of Input Channels | 1 (differential) | 8 (single-ended) / 4 (differential) | The ADS1256 integrates an input multiplexer for multi-channel systems, while the ADS1271 is a single-channel converter. |
| Input Configuration | Differential only | Single-ended or differential (mux) | Flexible input configuration affects sensor interfacing and board-level channel count. |
| Interface Type | SPI-compatible serial | SPI-compatible serial | Both use a serial SPI-style interface, easing digital-side redesign when swapping parts. |
| Supply Voltage (Analog) | 5 V | 5 V | Matching analog supply simplifies power-rail reuse in existing designs. |
| Package | TSSOP-16 | SSOP-28 | Different footprints and pin counts require PCB layout changes, preventing drop-in substitution. |
| Operating Temperature Range | -40 to +105 °C | -40 to +85 °C | The wider temperature range of the ADS1271 suits harsher industrial environments. |
| Integrated PGA | No | Yes (up to 64 V/V) | An integrated PGA allows direct connection of low-level sensors without external amplification. |
| Typical Power Consumption | ~70 mW (high-speed mode) | ~38 mW | Power budget differences affect thermal design and suitability for low-power systems. |
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 | ADS1271IBPWR | ADS1256IDBRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 105k | 30k |
| Number of Inputs | 1 | 4, 8 |
| Input Type | Differential | Differential, Single Ended |
| 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 |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | 1.8V ~ 3.6V |
| Features | - | PGA |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1271IBPWR and ADS1256IDBRG4?
The ADS1271IBPWR is a single-channel, 24-bit delta-sigma ADC with a fixed data rate up to 105 kSPS and a wide digital supply range, designed for high-resolution AC and DC measurements. The ADS1256IDBRG4 is an 8-channel (multiplexed), 24-bit delta-sigma ADC with a programmable data rate up to 30 kSPS and an integrated input multiplexer, PGA, and GPIO, suited for multi-channel sensor scanning. The ADS1271 uses a fixed oversampling architecture, while the ADS1256 offers programmable gain and channel selection.
Are the ADS1271IBPWR and ADS1256IDBRG4 pin-to-pin or package compatible?
No. The ADS1271IBPWR is supplied in a 20-pin TSSOP (PW) package, while the ADS1256IDBRG4 is supplied in a 28-pin SSOP (DB) package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for one another.
How do the maximum data rates of the ADS1271IBPWR and ADS1256IDBRG4 compare?
The ADS1271IBPWR supports a maximum data rate of 105 kSPS in its high-speed mode. The ADS1256IDBRG4 supports a maximum programmable data rate of 30 kSPS. The ADS1271 therefore offers a higher maximum throughput, while the ADS1256 trades throughput for multi-channel multiplexing and programmable gain.
How many input channels does each device support?
The ADS1271IBPWR is a single-channel ADC with differential inputs. The ADS1256IDBRG4 provides an 8-channel input multiplexer that can be configured as 8 single-ended or 4 differential inputs, plus internal monitoring channels. This makes the ADS1256 better suited to multi-sensor systems, while the ADS1271 targets single-channel high-resolution acquisition.
Do both devices include a programmable gain amplifier (PGA)?
No. The ADS1256IDBRG4 integrates a programmable gain amplifier with selectable gains (1, 2, 4, 8, 16, 32, 64) ahead of the modulator, allowing direct connection of low-level sensors. The ADS1271IBPWR does not include an integrated PGA; it provides a fixed-gain signal path and relies on external signal conditioning for gain.
What are the supply voltage requirements for the ADS1271IBPWR and ADS1256IDBRG4?
The ADS1271IBPWR operates from an analog supply (AVDD) of 5 V and a digital supply (DVDD) of 1.8 V to 3.3 V. The ADS1256IDBRG4 operates from an analog supply of 5 V and a digital supply of 1.8 V to 3.6 V. Both require careful decoupling and separate analog/digital supply routing per their respective datasheets.
Which device is more suitable for multi-channel data acquisition systems?
The ADS1256IDBRG4 is more suitable for multi-channel acquisition because it integrates an 8-channel input multiplexer, a PGA, and GPIO in a single package, reducing external component count for scanning multiple sensors. The ADS1271IBPWR is a single-channel device and would require external multiplexing and signal conditioning to handle multiple channels.
Can the ADS1271IBPWR and ADS1256IDBRG4 be used interchangeably in an existing design?
No. They differ in package, pinout, channel count, data rate, and integrated features (PGA, multiplexer, GPIO). Substitution would require PCB redesign, firmware changes for register configuration and interface timing, and revalidation of the analog front end against the target specifications.