Part A
ADS1242IPWR
德州儀器
- Lifecycle
- Active
- Stock
- 5745 件
- Package
- TSSOP-16
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS1222IPWRG4 is a functionally compatible replacement candidate for the ADS1242IPWR, sharing the same TSSOP-20 footprint, 24-bit delta-sigma architecture, and 2-channel differential input configuration. Designers should validate the differing SPI interface timing and supply voltage range against the target application before committing to a drop-in substitution.
Package Type
High match
Resolution and Architecture
High match
Supply Voltage Range
Validation required
Digital Interface
Validation required
Parts at a glance
Part B
ADS1222IPWRG4
德州儀器
- Lifecycle
- Active
- Stock
- 4722 件
- Package
- TSSOP-14
- 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 | ADS1242IPWR | ADS1222IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution is equivalent for high-precision measurement applications. |
| Number of input channels | 4 (differential) | 2 (differential) | Channel count determines how many independent signal sources can be measured; the ADS1242 supports twice as many differential inputs. |
| Input type | Differential | Differential | Differential inputs reject common-mode noise, which is critical for low-level sensor measurements. |
| Programmable gain amplifier (PGA) | Yes (1 to 128) | Yes (1 to 128) | An integrated PGA allows small sensor signals to be amplified before conversion, improving effective resolution. |
| Data rate (SPS) | Up to 2 kSPS | Up to 2 kSPS | Maximum sample rate affects how fast the system can capture changing signals. |
| Supply voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Supply range determines compatibility with the system power rail and logic levels. |
| Interface | SPI | SPI | A compatible serial interface ensures the part can be dropped into the same digital bus without redesign. |
| Package | TSSOP-16 | TSSOP-16 | Matching package and pinout enables direct board-level substitution without layout changes. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | The industrial temperature range ensures reliable operation in harsh environments. |
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 | ADS1242IPWR | ADS1222IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 15 | 240 |
| Number of Inputs | 4 | 2 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 3.3V, 5V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.5V |
| Features | PGA | Temperature Sensor |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS1242IPWR and ADS1222IPWRG4?
The ADS1242IPWR is a 24-bit delta-sigma ADC with a 4-channel differential input multiplexer, programmable gain amplifier, and SPI interface in a TSSOP-16 package. The ADS1222IPWRG4 is a 24-bit delta-sigma ADC with a 2-channel differential input multiplexer, PGA, and SPI interface in a TSSOP-16 package, supplied in Green (RoHS-compliant) packaging. The primary differences are input channel count (4 vs 2) and the G4 Green packaging designation on the ADS1222IPWRG4.
Are the ADS1242IPWR and ADS1222IPWRG4 pin-compatible?
Both devices are offered in a TSSOP-16 package, but pin compatibility must be verified against the respective manufacturer datasheets. The ADS1242IPWR provides four differential input channels while the ADS1222IPWRG4 provides two, so the analog input pin assignments differ. A direct drop-in replacement should not be assumed without confirming pin functions and the PCB land pattern against both datasheets.
Do both devices offer the same resolution and ADC architecture?
Yes. Both the ADS1242IPWR and ADS1222IPWRG4 are 24-bit delta-sigma analog-to-digital converters, providing high-resolution conversion suitable for precision sensor and measurement applications. Both integrate a programmable gain amplifier and an SPI-compatible serial interface.
What is the significance of the G4 suffix on the ADS1222IPWRG4?
The G4 suffix denotes Green packaging, indicating RoHS-compliant, lead-free construction per the manufacturer's Green product designation. The ADS1242IPWR is specified in standard packaging; designers requiring documented Green/RoHS compliance should confirm the ordering code and packaging status in the respective datasheets.
Can the ADS1222IPWRG4 replace the ADS1242IPWR in an existing design?
Replacement is possible only if the design does not require the two additional differential input channels present on the ADS1242IPWR and if pin functions, package footprint, and electrical specifications are validated against both datasheets. Because the input multiplexer channel count differs, a direct substitution should not be made without schematic and layout verification.
Which applications are these 24-bit ADCs suited for?
Both devices are intended for precision measurement applications such as industrial process control, weigh scales, temperature and pressure sensing, and portable instrumentation, where high resolution and low-noise delta-sigma conversion with SPI communication are required. Selection between them depends primarily on the number of differential input channels needed.
Do both parts use the same serial interface for communication?
Yes. Both the ADS1242IPWR and ADS1222IPWRG4 use an SPI-compatible serial interface for configuration and data readout, allowing connection to common microcontrollers and digital signal processors. Exact timing and register map details should be confirmed in each device's datasheet.