Part A
ADS1281IPWR
德州儀器
- Lifecycle
- Active
- Stock
- 7474 件
- Package
- TSSOP-24
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS1281IPWR and ADS1230IPWG4 are not drop-in replacements for one another. The ADS1281IPWR is a high-resolution 31-bit delta-sigma ADC with a serial SPI interface in a TSSOP-28 package, while the ADS1230IPWG4 is a 20-bit delta-sigma ADC with a two-wire serial interface in a TSSOP-16 package. They differ in resolution, interface type, channel configuration, and package footprint, so a direct board-level substitution is not possible without redesign.
Different resolution
Different interface type
Different channel count
Different footprint
Parts at a glance
Part B
ADS1230IPWG4
德州儀器
- Lifecycle
- Active
- Stock
- 6107 件
- Package
- TSSOP-16
- Series
- 資料獲取-模數轉換器（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 | ADS1281IPWR | ADS1230IPWG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 31 | 20 | Higher resolution enables finer measurement of small signal changes; a 31-bit delta-sigma converter provides significantly more dynamic range than a 20-bit device. |
| Architecture | Delta-Sigma (2nd order) | Delta-Sigma | The converter architecture determines noise shaping, linearity, and suitability for precision sensor or seismic applications. |
| Sample Rate (max) | 4 kSPS | 80 SPS | Maximum output data rate affects how fast the system can capture changing signals; the ADS1281 supports much higher throughput. |
| Number of Input Channels | 1 (differential) | 1 (differential) | Both are single-channel differential devices, so channel count is not a differentiator for substitutability. |
| Input Type | Differential | Differential | Differential inputs reject common-mode noise, important for low-level sensor measurements. |
| Supply Voltage (analog) | 5 V (analog), 1.8 V to 3.3 V (digital) | 2.7 V to 5.3 V | Supply requirements determine power-rail compatibility and whether the part can drop into an existing design without regulator changes. |
| Interface | SPI (serial) | SPI (serial) | Both use a serial SPI-compatible interface, simplifying digital host connection and firmware reuse. |
| Package | TSSOP-28 | TSSOP-16 | Different package footprints and pin counts mean the parts are not drop-in replacements on the same PCB layout. |
| Operating Temperature Range | -40°C to +85°C | -40°C to +85°C | Identical industrial temperature ratings mean both suit the same environmental conditions. |
| Typical Application Focus | Seismic, energy exploration, high-resolution instrumentation | Weigh scales, strain gauges, pressure sensors | Target application areas indicate the intended noise/linearity trade-offs and help judge functional substitutability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1281IPWR | ADS1230IPWG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 31 | 20 |
| Sampling Rate(Per Second) | 4k | 80 |
| Number of Inputs | 1 | 1 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | ADC | PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 2.7V ~ 5.3V |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | 2.7V ~ 5.3V |
| Features | - | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the ADS1281IPWR and the ADS1230IPWG4?
The ADS1281IPWR is a 31-bit, single-channel delta-sigma ADC with a maximum data rate of 4 kSPS, designed for high-resolution seismic and energy exploration applications, housed in a TSSOP-24 package. The ADS1230IPWG4 is a 20-bit, single-channel delta-sigma ADC with a maximum data rate of 80 SPS, optimized for weigh scales and bridge sensors, housed in a TSSOP-16 package. They differ in resolution, data rate, package pin count, and target application.
Are the ADS1281IPWR and ADS1230IPWG4 pin-to-pin compatible?
No. The ADS1281IPWR uses a TSSOP-24 package, while the ADS1230IPWG4 uses a TSSOP-16 package. The different pin counts and pin functions prevent direct PCB footprint compatibility, so a board redesign is required to substitute one for the other.
Can the ADS1230IPWG4 directly replace the ADS1281IPWR in an existing design?
No. Beyond package incompatibility, the two devices differ in resolution (20-bit vs 31-bit), maximum output data rate (80 SPS vs 4 kSPS), and interface timing. A direct drop-in replacement is not possible; the design would require schematic, layout, and firmware changes validated against the respective datasheets.
What are the typical applications for each device?
The ADS1281IPWR is intended for high-resolution seismic data acquisition, energy exploration, and precision instrumentation requiring up to 31-bit resolution. The ADS1230IPWG4 is intended for weigh scales, strain gauge and bridge sensor interfaces, and other low-speed, high-resolution measurement systems operating at data rates up to 80 SPS.
How do the maximum data rates of the ADS1281IPWR and ADS1230IPWG4 compare?
The ADS1281IPWR supports a maximum data rate of 4 kSPS, while the ADS1230IPWG4 supports a maximum data rate of 80 SPS. The ADS1281IPWR is therefore suitable for higher-speed acquisition, whereas the ADS1230IPWG4 targets slow, precision measurement applications.
Do both devices support a similar digital interface?
Both devices provide a serial digital interface for output data, but the specific protocol, timing, and register set differ between the ADS1281IPWR and ADS1230IPWG4. Firmware and host interface logic must be adapted per the respective manufacturer datasheets; the interfaces are not interchangeable without modification.
Which device offers higher resolution, and does that affect selection?
The ADS1281IPWR offers higher resolution at 31 bits compared with the 20-bit ADS1230IPWG4. Selection depends on the required dynamic range and noise performance: the ADS1281IPWR suits demanding high-resolution instrumentation, while the ADS1230IPWG4 is adequate for lower-resolution weigh-scale and bridge-sensor applications.