Part A
ADS1281IPWR
Техасские инструменты
- Lifecycle
- Active
- Stock
- 7474 ПКС
- Package
- TSSOP-24
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1281IPWR is a functionally compatible replacement candidate for the ADS1282IPW, sharing the same 24-bit delta-sigma ADC core, TSSOP-28 footprint, and industrial temperature range, though the ADS1282IPW adds an integrated PGA and requires validation of the differing input architecture and power consumption in the target application.
Resolution and ADC Architecture
High match
Package and Pin Footprint
High match
Input Configuration
Validation required
Power Consumption
Validation required
Parts at a glance
Part B
ADS1282IPW
Техасские инструменты
- Lifecycle
- Active
- Stock
- 4636 ПКС
- Package
- TSSOP-28
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | ADS1282IPW | ADS1281IPWR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 31 | 31 | Both are 31-bit delta-sigma ADCs, so resolution is equivalent for high-precision measurement applications. |
| Number of Input Channels | 2 (differential) | 1 (differential) | The ADS1282 provides two differential inputs (with an input multiplexer), while the ADS1281 has a single differential input; this affects multi-sensor designs. |
| Input Multiplexer | Yes (2-channel MUX) | No | An integrated MUX allows switching between multiple signal sources without external components, simplifying system design. |
| PGA / Gain Stages | Yes (low-noise PGA) | No | The ADS1282 includes a programmable gain amplifier for direct connection of low-level sensors, whereas the ADS1281 requires external signal conditioning. |
| Data Output Rate (max SPS) | 4000 SPS | 4000 SPS | Both support up to 4000 samples per second, suitable for seismic and precision industrial measurement. |
| Supply Voltage (analog) | 5 V (analog), 3.3 V (digital) | 5 V (analog), 3.3 V (digital) | Identical supply requirements allow the same power rail design for either part. |
| Package | TSSOP-28 | TSSOP-24 | Different pin counts and footprints mean the PCB layout must be redesigned; the parts are not drop-in footprint compatible. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Both cover the industrial temperature range, so environmental suitability is equivalent. |
| Interface | SPI (serial) | SPI (serial) | Both use a compatible SPI interface, easing digital-side integration for either device. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1281IPWR | ADS1282IPW |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 31 | 31 |
| Sampling Rate(Per Second) | 4k | 4k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential, Single Ended | 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 | 5V |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | 1.65V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Features | - | PGA |
Frequently asked questions
What are the key differences between the ADS1282IPW and ADS1281IPWR?
The ADS1282IPW is a 31-bit delta-sigma ADC with an integrated programmable gain amplifier (PGA) and two-channel input multiplexer, while the ADS1281IPWR is a 31-bit delta-sigma ADC without an integrated PGA or input multiplexer. Both are single-channel ADCs from Texas Instruments in a TSSOP-28 package, but the ADS1282 includes a PGA (gains of 1, 2, 4, 8, 16, 32, 64) and a 2:1 input MUX, whereas the ADS1281 provides a fixed-gain signal path without these features.
Are the ADS1282IPW and ADS1281IPWR pin-compatible?
No. Although both devices are offered in a 28-pin TSSOP package, their pin functions differ because the ADS1282IPW includes PGA and multiplexer control pins that the ADS1281IPWR does not. A direct drop-in replacement is not possible without verifying pin functions and PCB layout against the respective datasheets.
Do both devices share the same resolution and data rate specifications?
Both are 31-bit delta-sigma ADCs. The ADS1282IPW supports data rates from 250 SPS to 4 kSPS, and the ADS1281IPWR supports data rates from 250 SPS to 4 kSPS as well. Both target high-resolution seismic and energy exploration applications, but the ADS1282IPW adds PGA and MUX functionality that affects the effective input range and configuration.
Can the ADS1281IPWR be used as a substitute for the ADS1282IPW in an existing design?
Not directly. Because the ADS1282IPW integrates a PGA and a two-channel input multiplexer that the ADS1281IPWR lacks, substituting the ADS1281IPWR would require external signal conditioning and rework of the input stage. The substitution should only be made after validating the signal chain, pin functions, and firmware configuration against the ADS1281IPWR datasheet.
What are the package and ordering differences between ADS1282IPW and ADS1281IPWR?
Both parts are supplied in a 28-pin TSSOP package. The ADS1282IPW is typically ordered in tube format, while the ADS1281IPWR suffix indicates tape-and-reel packaging. The "I" grade in both part numbers denotes the industrial temperature range of -40°C to +85°C.
Which device is better suited for multi-sensor seismic acquisition systems?
The ADS1282IPW is generally more suitable for multi-sensor acquisition because its integrated two-channel input multiplexer allows switching between two sensor inputs without external multiplexing hardware, and its PGA supports direct interfacing with geophones of varying sensitivity. The ADS1281IPWR is better suited to single-sensor channels where a fixed input configuration is acceptable.
Do both ADCs support the same digital interface and reference configuration?
Both devices provide a serial peripheral interface (SPI)-compatible digital interface and support differential reference inputs. However, register maps and configuration commands differ because the ADS1282IPW includes PGA and MUX control registers that the ADS1281IPWR does not. Firmware must be adapted accordingly when migrating between the two devices.