Part A
ADS1222IPWR
德州儀器
- Lifecycle
- Active
- Stock
- 3095 件
- Package
- TSSOP-14
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS1281IPW and ADS1222IPWR are not drop-in replacements for each other. They differ in resolution, architecture, channel configuration, and package footprint, so a direct board-level substitution is not feasible without redesign and validation.
Different resolution
Different ADC architecture
Different channel count
Different package footprint
Parts at a glance
Part B
ADS1281IPW
德州儀器
- Lifecycle
- Active
- Stock
- 4383 件
- Package
- TSSOP-24
- 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 | ADS1281IPW | ADS1222IPWR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 31 | 24 | Higher resolution enables finer measurement of small signal changes, which is critical for precision sensing applications. |
| Number of input channels | 1 (differential) | 2 (differential) | Channel count determines how many independent signals can be measured without external multiplexing. |
| Maximum sampling rate | 4 kSPS | 2 kSPS | Sampling rate limits the bandwidth of signals that can be accurately captured and digitized. |
| Interface type | SPI | SPI | A compatible digital interface simplifies drop-in replacement without redesigning the host communication bus. |
| Supply voltage (analog) | 5 V (analog), 3.3 V (digital) | 2.7 V to 5.5 V | Supply voltage compatibility affects whether the part can operate in the same power rail architecture. |
| Package type | TSSOP-24 | TSSOP-16 | Package footprint and pin count must match for physical board compatibility. |
| Operating temperature range | -40°C to +85°C | -40°C to +85°C | Matching temperature ranges ensure the replacement meets the same environmental requirements. |
| Input type | Differential | Differential | Differential inputs improve common-mode noise rejection, important for low-level signal measurement. |
| Internal PGA | No | Yes | An internal programmable gain amplifier allows direct connection of low-amplitude sensors without external gain stages. |
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 | ADS1222IPWR | ADS1281IPW |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 31 |
| Sampling Rate(Per Second) | 240 | 4k |
| Number of Inputs | 2 | 1 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 1.65V ~ 3.6V |
| Features | Temperature Sensor | - |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the ADS1281IPW and ADS1222IPWR?
The ADS1281IPW is a single-channel, 31-bit delta-sigma ADC with a maximum data rate of 4 kSPS, housed in a 24-pin TSSOP package, and specified for operation from -40°C to +85°C. The ADS1222IPWR is a 24-bit delta-sigma ADC with two differential input channels, a maximum data rate of 105 SPS, housed in a 20-pin TSSOP (PW) package in tape-and-reel form, and specified from -40°C to +85°C. The ADS1281 targets high-resolution seismic and energy exploration applications, while the ADS1222 targets low-power sensor measurement applications.
Are the ADS1281IPW and ADS1222IPWR pin-to-pin compatible?
No. The ADS1281IPW uses a 24-pin TSSOP package, while the ADS1222IPWR uses a 20-pin TSSOP package. The differing pin counts and pin functions prevent direct PCB footprint interchangeability without a layout redesign.
How do the resolution and data rate specifications compare?
The ADS1281IPW provides 31-bit resolution with programmable data rates up to 4 kSPS. The ADS1222IPWR provides 24-bit resolution with a maximum data rate of 105 SPS. The ADS1281 therefore offers higher resolution and a significantly faster maximum output rate, while the ADS1222 is optimized for lower-speed, lower-power measurement.
Do both devices support the same supply voltage range?
No. The ADS1281IPW operates from an analog supply (AVDD) of 4.75 V to 5.25 V and a digital supply (DVDD) of 2.7 V to 3.6 V. The ADS1222IPWR operates from a single supply of 2.7 V to 5.5 V. Designs must verify supply rails against the respective datasheet before substitution.
What are the input channel configurations of each device?
The ADS1281IPW is a single-channel ADC with a differential analog input. The ADS1222IPWR provides two differential input channels that can be configured for multiplexed measurement. The channel count difference affects system architecture and multiplexing requirements.
How do the power consumption characteristics differ?
The ADS1281IPW is specified with an analog supply current typical of high-resolution converter operation at its rated data rates, while the ADS1222IPWR is designed for low-power operation with a typical supply current in the low hundreds of microamperes range at low data rates. Exact current figures should be taken from the respective manufacturer datasheets for the operating conditions of the target design.
Can the ADS1222IPWR directly replace the ADS1281IPW in an existing design?
No. Differences in package pin count (20 vs 24 pins), resolution (24-bit vs 31-bit), maximum data rate (105 SPS vs 4 kSPS), channel configuration, and supply requirements prevent a direct drop-in replacement. Any substitution requires schematic, layout, and firmware validation against both datasheets.