Part A
ADS1282IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 4636 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1282IPW and ADS1222IPWRG4 are not functionally interchangeable. The ADS1282IPW is a high-resolution 31-bit delta-sigma ADC with an integrated PGA and dual-channel input, while the ADS1222IPWRG4 is a 24-bit delta-sigma ADC with a different channel configuration, resolution, and package. Designers must validate the entire signal chain, reference, and digital interface before considering any substitution.
Different resolution
Different channel count
Different package
Different input architecture
Parts at a glance
Part B
ADS1222IPWRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4722 PCS
- Package
- TSSOP-14
- 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 | ADS1222IPWRG4 | 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) | 2 (differential) | Channel count determines how many independent signals can be digitized; both offer two differential inputs for flexible sensor interfacing. |
| Maximum sampling rate | 4 kSPS | 2 kSPS | Sampling rate sets the bandwidth of signals that can be captured; higher rates support faster-changing inputs and wider signal bandwidth. |
| Interface type | SPI | SPI | A compatible serial interface ensures the device can be connected to the same host microcontroller without redesigning the communication bus. |
| Supply voltage (analog) | 5 V (analog), 3.3 V (digital) | 2.7 V to 5.5 V | Supply voltage compatibility determines whether the part can operate in the existing power rail architecture without additional regulation. |
| PGA / gain stage | Yes (integrated PGA) | Yes (integrated PGA) | An integrated programmable gain amplifier allows small sensor signals to be amplified before conversion, improving effective resolution. |
| Package | TSSOP-28 | TSSOP-16 | Package footprint and pin count affect PCB layout and whether a drop-in replacement is physically possible. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the target application environment to guarantee specified performance and reliability. |
| Power consumption (typical) | ~25 mW | ~1.2 mW | Power consumption impacts thermal budget and battery life, especially in portable or low-power instrumentation designs. |
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 | ADS1282IPW | ADS1222IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 31 | 24 |
| Sampling Rate(Per Second) | 4k | 240 |
| Number of Inputs | 1 | 2 |
| Input Type | Differential | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | 2.7V ~ 5.5V |
| Features | PGA | Temperature Sensor |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary functional differences between the ADS1282IPW and ADS1222IPWRG4?
The ADS1282IPW is a high-resolution, 31-bit delta-sigma ADC designed for seismic and energy exploration applications, featuring a programmable gain amplifier (PGA) and a low-noise architecture. The ADS1222IPWRG4 is a 24-bit delta-sigma ADC with a built-in PGA, intended for precision sensor measurement in industrial and portable applications. The ADS1282IPW offers higher resolution (31-bit) and is optimized for low-frequency, high-dynamic-range signals, while the ADS1222IPWRG4 provides 24-bit resolution with a different feature set and power profile.
Are the ADS1282IPW and ADS1222IPWRG4 pin-compatible or package-compatible?
No. The ADS1282IPW is supplied in a 28-pin TSSOP (PW) package, while the ADS1222IPWRG4 is supplied in a 16-pin TSSOP (PW) package with a different pin count and pinout. They are not pin-compatible or footprint-compatible, and cannot be interchanged on the same PCB without redesign.
Can the ADS1222IPWRG4 be used as a direct substitute for the ADS1282IPW in an existing design?
No. The two devices differ in resolution (31-bit vs. 24-bit), package pin count (28-pin vs. 16-pin), pinout, and likely register map and control interface. A direct substitution is not possible without verifying all electrical, timing, and functional differences against the respective manufacturer datasheets and redesigning the PCB and firmware accordingly.
How do the power consumption characteristics of the ADS1282IPW and ADS1222IPWRG4 compare?
Both devices are delta-sigma ADCs with programmable power modes, but their power consumption differs due to architecture and resolution. The ADS1282IPW, with its higher 31-bit resolution and low-noise PGA, typically operates at higher supply current than the ADS1222IPWRG4, which is a 24-bit device. Exact power figures should be taken from the respective Texas Instruments datasheets, as consumption depends on selected gain, data rate, and power mode.
What are the typical target applications for the ADS1282IPW versus the ADS1222IPWRG4?
The ADS1282IPW is typically used in seismic data acquisition, energy exploration, and high-resolution industrial measurement where low noise and high dynamic range at low frequencies are critical. The ADS1222IPWRG4 is typically used in precision sensor interfaces, portable instrumentation, and industrial process control where 24-bit resolution and a compact 16-pin package are sufficient. Application suitability should be confirmed against each device's datasheet specifications.
Do both devices support a programmable gain amplifier (PGA) and what are the gain ranges?
Yes, both the ADS1282IPW and ADS1222IPWRG4 include a programmable gain amplifier. The ADS1282IPW provides selectable gains (typically 1, 2, 4, 8, 16, 32, 64) for its low-noise PGA, while the ADS1222IPWRG4 also offers programmable gain settings for sensor signal conditioning. The exact gain options and associated input ranges must be verified in the respective Texas Instruments datasheets, as they are not identical across the two devices.
What are the maximum data output rates for the ADS1282IPW and ADS1222IPWRG4?
The ADS1282IPW supports programmable data rates typically up to 4 kSPS (with higher rates in some modes), optimized for high-resolution low-frequency measurements. The ADS1222IPWRG4 supports data rates up to approximately 2 kSPS depending on configuration. Exact maximum data rates, filter settings, and settling behavior should be confirmed from the official Texas Instruments datasheets for each device.
Are the ADS1282IPW and ADS1222IPWRG4 both RoHS-compliant and available in green (G4) versions?
The ADS1222IPWRG4 carries the "G4" suffix, which denotes a green (RoHS-compliant, lead-free) package variant per Texas Instruments nomenclature. The ADS1282IPW is also available in RoHS-compliant packaging, but the specific ordering suffix and compliance status should be verified on the Texas Instruments product page or an authorized distributor listing before design release.