Part A
ADS1220IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 4062 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1220IPW can serve as a functional replacement candidate for the ADS1282IPW in lower-resolution, lower-power seismic and precision sensor designs, but it is not a drop-in substitute. The ADS1282IPW remains the required choice where 32-bit resolution, high dynamic range, and a wide ±2.5 V analog supply are essential, while the ADS1220IPW offers a smaller, lower-power alternative with a narrower supply range and reduced resolution that must be validated against the target application's noise and accuracy budget.
Resolution and Dynamic Range
Validation required
Analog Supply Range
Validation required
Digital Interface
High match
Package and Pinout
Validation required
Parts at a glance
Part B
ADS1282IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 4636 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS1220IPW | Why it matters |
|---|---|---|---|
| Resolution (bits) | 31 | 24 | Higher resolution enables finer measurement of small signal changes, which is critical for precision sensor and seismic applications. |
| Number of input channels | 2 (differential) | 4 (2 differential / 4 single-ended) | More channels allow the device to interface with more sensors without external multiplexing, affecting system complexity and cost. |
| Maximum sample rate | 4 kSPS | 2 kSPS | Sample rate determines the bandwidth of signals that can be captured; higher rates suit faster-changing inputs. |
| PGA gain range | 1 to 64 | 1 to 128 | Programmable gain amplifies small sensor signals; a wider range improves sensitivity for low-level inputs. |
| Supply voltage | 2.7 V to 5.25 V (analog), 1.8 V to 3.6 V (digital) | 2.3 V to 5.5 V (analog), 2.3 V to 5.5 V (digital) | Supply range affects compatibility with system power rails and low-power operation. |
| Interface | SPI | SPI | Both use SPI, so host microcontroller compatibility is preserved, though timing and register maps differ. |
| Internal oscillator | No | Yes | An internal oscillator simplifies design by removing the need for an external clock source. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +125 °C | A wider temperature range supports use in harsher environments and industrial applications. |
| Package | TSSOP-28 | TSSOP-16 | Package footprint and pin count affect PCB layout and are not drop-in compatible between the two parts. |
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 | ADS1220IPW | ADS1282IPW |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 31 |
| Sampling Rate(Per Second) | 2k | 4k |
| Number of Inputs | 2, 4 | 1 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal, Supply | External |
| Voltage - Supply, Analog | 2.3V ~ 5.5V, ±2.5 | 5V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 1.65V ~ 3.6V |
| Features | PGA, Temperature Sensor | PGA |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the ADS1282IPW and ADS1220IPW?
The ADS1282IPW is a 31-bit delta-sigma ADC with a maximum data rate of 4 kSPS, designed for high-resolution seismic and energy exploration applications, featuring a programmable gain amplifier (PGA) with gains of 1, 2, 4, 8, and 16. The ADS1220IPW is a 24-bit delta-sigma ADC with a maximum data rate of 2 kSPS, offering a PGA with gains from 1 to 128 and integrated features such as a voltage reference, oscillator, and SPI interface, targeting general-purpose sensor measurement applications.
Are the ADS1282IPW and ADS1220IPW pin-compatible?
No. Both devices are offered in a 24-pin TSSOP (PW) package, but their pin functions and assignments differ. The ADS1282IPW includes dedicated pins for external crystal/clock input and synchronization, while the ADS1220IPW provides pins for its internal oscillator, dedicated DRDY, and different analog input routing. They are not drop-in replacements for each other.
What are the resolution and data rate specifications of each device?
The ADS1282IPW provides 31-bit resolution with selectable data rates from 250 SPS to 4 kSPS. The ADS1220IPW provides 24-bit resolution with selectable data rates from 20 SPS to 2 kSPS. The ADS1282IPW is optimized for higher resolution at moderate speeds, while the ADS1220IPW offers lower resolution with a wider range of lower data rates for general sensor applications.
How do the PGA gain ranges compare between the ADS1282IPW and ADS1220IPW?
The ADS1282IPW integrates a PGA with selectable gains of 1, 2, 4, 8, and 16. The ADS1220IPW integrates a PGA with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128. The ADS1220IPW supports higher gain settings, making it suitable for lower-amplitude sensor signals, while the ADS1282IPW focuses on high-resolution conversion with moderate gain.
Do both devices support an internal voltage reference?
No. The ADS1220IPW includes an integrated 2.048 V voltage reference, along with an internal oscillator and temperature sensor. The ADS1282IPW does not include an internal voltage reference and requires an external reference for operation. This difference affects system design complexity and external component count.
What are the typical target applications for the ADS1282IPW versus the ADS1220IPW?
The ADS1282IPW is typically used in high-resolution seismic data acquisition, energy exploration, and precision industrial measurement where 31-bit resolution and synchronization features are required. The ADS1220IPW is typically used in portable instrumentation, temperature and pressure sensors, flow meters, and general-purpose data acquisition where a 24-bit ADC with integrated reference and oscillator simplifies design.
What digital interfaces do the ADS1282IPW and ADS1220IPW provide?
The ADS1282IPW provides a serial peripheral interface (SPI) compatible interface with additional synchronization and clock input pins for multi-device coordination. The ADS1220IPW provides a standard SPI interface with dedicated DRDY, and includes an internal oscillator that can be used as the clock source, reducing external timing components. Both devices support SPI communication, but the ADS1282IPW includes synchronization features not present on the ADS1220IPW.