Part A
ADS1230IPW
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 2859 個数
- Package
- TSSOP-16
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1230IPW and ADS1281IPWG4 are not drop-in replacements for one another. The ADS1230IPW is a 20-bit single-channel delta-sigma ADC in a TSSOP-16 package with a maximum data rate of 80 SPS, while the ADS1281IPWG4 is a 31-bit single-channel delta-sigma ADC in a TSSOP-24 package supporting data rates up to 4 kSPS. The differing resolution, package footprint, sample rate capability, and supply architecture mean the two devices serve distinct application classes and cannot be interchanged without redesign.
Different resolution
Different package footprint
Different sample rate
Different supply architecture
Parts at a glance
Part B
ADS1281IPWG4
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 6397 個数
- Package
- TSSOP-24
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | ADS1230IPW | ADS1281IPWG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 20 | 31 | Higher resolution enables detection of smaller signal changes, which is critical for precision measurement applications. |
| Number of input channels | 1 (differential) | 1 (differential) | Both are single differential-input ADCs, so channel count does not differentiate them for multi-sensor designs. |
| Data rate (SPS) | 10 to 80 | Up to 4000 | Maximum sample rate determines the bandwidth of signals that can be captured and affects anti-aliasing requirements. |
| Interface type | SPI (2-wire, read-only) | SPI (4-wire) | Interface compatibility affects microcontroller pin requirements and firmware design for the host system. |
| Supply voltage (analog) | 2.7 V to 5.3 V | 4.75 V to 5.25 V | Supply range determines compatibility with the system power rail and low-voltage operation capability. |
| Package type | TSSOP-16 | TSSOP-24 | Package footprint and pin count affect PCB layout and whether a drop-in replacement is possible. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range confirms suitability for industrial and extended-environment applications. |
| Input type | Differential | Differential | Differential inputs improve common-mode noise rejection, important for low-level sensor signals. |
| PGA / gain stages | Fixed gain of 128 | Programmable gain (1 to 8) | Gain flexibility allows adaptation to different sensor signal amplitudes without external amplification. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1230IPW | ADS1281IPWG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 20 | 31 |
| Sampling Rate(Per Second) | 80 | 4k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | PGA-ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.3V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.3V | 1.65V ~ 3.6V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Features | PGA | - |
Frequently asked questions
What are the primary differences between the ADS1230IPW and ADS1281IPWG4?
The ADS1230IPW is a 20-bit delta-sigma ADC with an integrated low-noise PGA, designed primarily for weigh scales and bridge sensors, offering data rates of 10 SPS or 80 SPS. The ADS1281IPWG4 is a 31-bit delta-sigma ADC designed for seismic and high-resolution energy exploration applications, featuring a programmable gain amplifier and data rates up to 4 kSPS. They differ fundamentally in resolution, target application, and output data rate capabilities.
Are the ADS1230IPW and ADS1281IPWG4 pin-to-pin compatible?
No. The ADS1230IPW is supplied in a 16-pin TSSOP package, while the ADS1281IPWG4 is supplied in a 24-pin TSSOP package. The differing pin counts and pin functions prevent direct PCB drop-in replacement without a board redesign.
What are the specified resolution and data rate capabilities of each device?
The ADS1230IPW provides 20-bit resolution with selectable data rates of 10 SPS or 80 SPS. The ADS1281IPWG4 provides 31-bit resolution with programmable data rates from 250 SPS to 4 kSPS. These specifications are documented in the respective Texas Instruments datasheets.
Do both devices include an integrated programmable gain amplifier (PGA)?
Yes. The ADS1230IPW includes an integrated low-noise PGA with a fixed gain of 128, intended for direct connection to bridge sensors. The ADS1281IPWG4 includes a programmable gain amplifier with selectable gains of 1, 2, 4, 8, 16, 32, and 64. The gain architecture and flexibility differ significantly between the two parts.
What are the supply voltage requirements for the ADS1230IPW and ADS1281IPWG4?
The ADS1230IPW operates from a single analog supply of 2.7 V to 5.3 V and a digital supply of 2.7 V to 5.3 V. The ADS1281IPWG4 operates from an analog supply of 4.75 V to 5.25 V (with a separate 2.5 V reference) and a digital supply of 1.8 V to 3.3 V. Designs must account for these differing supply rails.
Which device is more suitable for seismic or high-resolution energy exploration applications?
The ADS1281IPWG4 is the appropriate choice for seismic and energy exploration applications. Its 31-bit resolution, programmable gain up to 64, and data rates up to 4 kSPS are specified by Texas Instruments for these high-resolution, higher-bandwidth measurement requirements. The ADS1230IPW is optimized for low-frequency weigh-scale and bridge-sensor applications.
Can the ADS1230IPW and ADS1281IPWG4 share the same reference voltage configuration?
No. The ADS1230IPW uses a ratiometric reference configuration tied to its supply and excitation voltage, typically 2.7 V to 5.3 V. The ADS1281IPWG4 requires an external 2.5 V reference voltage. The reference architectures and required reference levels are not interchangeable between the two devices.