Part A
ADS1271IBPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6728 Stückzahl
- Package
- TSSOP-16
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1246IPW and ADS1271IBPWR are both 24-bit delta-sigma ADCs, but they differ fundamentally in resolution architecture, sample rate, channel count, and package footprint, so neither part can serve as a direct drop-in substitute for the other. The ADS1246IPW is a single-channel, low-speed precision converter with integrated PGA and low-noise input, while the ADS1271IBPWR is a wide-bandwidth single-channel converter optimized for higher sample rates with a different digital filter and interface profile. Designers must re-validate the analog front end, clocking, and PCB layout before considering any substitution.
Different sample rate class
Different digital filter profile
Different package footprint
Different input architecture
Parts at a glance
Part B
ADS1246IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 6549 Stückzahl
- Package
- TSSOP-16
- Series
- Datenerfassung mit 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 | ADS1246IPW | ADS1271IBPWR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not distinguish them for substitutability. |
| Architecture | Delta-Sigma | Delta-Sigma | Same converter architecture means similar noise-shaping behavior and filtering characteristics. |
| Number of input channels | 1 (single-ended/differential) | 1 (differential) | Channel configuration affects how many signals can be measured and whether single-ended inputs are supported. |
| Maximum sample rate | 2 kSPS | 105 kSPS | The ADS1271 supports a much higher data rate, making it suitable for faster signal bandwidths than the ADS1246. |
| Interface type | SPI | SPI | Both use SPI, so the same digital host interface can generally be reused. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 4.75 V to 5.25 V | The ADS1246 operates over a wider analog supply range, while the ADS1271 requires a nominal 5 V analog supply. |
| Supply voltage (digital) | 2.7 V to 5.25 V | 1.65 V to 3.6 V | Digital I/O voltage compatibility with the host logic must be checked when substituting one part for the other. |
| Package | TSSOP-16 | TSSOP-16 | Identical package and pin count simplify board-level replacement, though pinout must still be verified. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +105 °C | Matching temperature ranges mean both are suitable for the same industrial environments. |
| Internal PGA | Yes (1 to 128 gain) | No | The ADS1246 includes a programmable gain amplifier for small-signal sensing, while the ADS1271 relies on external signal conditioning. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1271IBPWR | ADS1246IPW |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 105k | 2k |
| Number of Inputs | 1 | 1 |
| 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, Internal |
| Voltage - Supply, Analog | 5V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | 2.7V ~ 5.25V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
| Features | - | PGA, Temperature Sensor |
Frequently asked questions
What are the primary functional differences between the ADS1246IPW and ADS1271IBPWR?
The ADS1246IPW is a 24-bit, single-channel delta-sigma ADC optimized for low-speed, high-precision sensor measurement with an integrated PGA and low-noise input buffer, operating at data rates up to 2 kSPS. The ADS1271IBPWR is a 24-bit, single-channel delta-sigma ADC designed for wide-bandwidth industrial measurement, supporting data rates up to 105 kSPS with a fixed gain of 1 and no integrated PGA. The ADS1246 targets precision DC and low-frequency applications, while the ADS1271 targets higher-speed dynamic signal acquisition.
Are the ADS1246IPW and ADS1271IBPWR pin-compatible and directly interchangeable?
No. Both devices are offered in a 16-pin TSSOP package (PW suffix), but their pin functions and internal architectures differ. The ADS1246IPW includes PGA input pins, reference input pins, and dedicated GPIO/clock control pins, whereas the ADS1271IBPWR has a different pin assignment for its modulator and digital filter interface. Direct substitution without PCB redesign and firmware changes is not supported.
How do the maximum data rates of the ADS1246IPW and ADS1271IBPWR compare?
The ADS1246IPW supports programmable data rates up to 2 kSPS in normal mode. The ADS1271IBPWR supports data rates up to 105 kSPS in high-speed mode, with selectable modes for high-resolution (52 kSPS), high-speed (105 kSPS), and low-power operation. The ADS1271 is therefore suitable for applications requiring wider signal bandwidth, while the ADS1246 is intended for low-frequency precision measurements.
Do both devices include an integrated programmable gain amplifier (PGA)?
No. The ADS1246IPW integrates a low-noise PGA with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128, allowing direct connection of low-level sensors such as thermocouples and RTDs. The ADS1271IBPWR does not include an integrated PGA; its input range is fixed relative to the reference voltage, so external signal conditioning is required for low-level signals.
What are the typical supply voltage and reference requirements for each device?
The ADS1246IPW operates from an analog supply (AVDD) of 2.7 V to 5.25 V and a digital supply (DVDD) of 2.7 V to 5.25 V, with an external reference input. The ADS1271IBPWR operates from an analog supply of 4.75 V to 5.25 V and a digital supply of 1.65 V to 3.6 V, also requiring an external reference. Designers must verify supply sequencing and reference drive requirements against the respective datasheets.
Which device is better suited for high-resolution low-frequency sensor applications?
The ADS1246IPW is generally better suited for low-frequency, high-resolution sensor applications because it combines a 24-bit delta-sigma modulator with an integrated PGA, low-noise input buffer, and programmable data rates up to 2 kSPS, enabling direct interfacing with low-level sensors. The ADS1271IBPWR is optimized for higher-speed, wider-bandwidth industrial measurement and lacks an integrated PGA, making it less ideal for direct low-level sensor connection without external amplification.
What are the package and operating temperature specifications for both parts?
Both the ADS1246IPW and ADS1271IBPWR are supplied in a 16-pin TSSOP (PW) package. The ADS1246IPW is specified for operation over the industrial temperature range of -40°C to +105°C. The ADS1271IBPWR is specified for operation over -40°C to +105°C. Customers should confirm the exact temperature grade and package marking from the manufacturer datasheet for the specific orderable part number.
Can the ADS1271IBPWR be used as a drop-in replacement for the ADS1246IPW in an existing design?
No. Although both are 24-bit single-channel delta-sigma ADCs in 16-pin TSSOP packages, they differ in pin assignment, supply requirements, data rate capability, and integrated features such as the PGA. Replacing the ADS1246IPW with the ADS1271IBPWR would require PCB layout changes, revised external signal conditioning, and updated firmware for the digital interface and configuration registers. A direct drop-in replacement is not supported.