Part A
ADS1246IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 2336 PCS
- Package
- TSSOP-16
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1246IPWR and ADS1224IPWTG4 are both 24-bit delta-sigma ADCs in TSSOP packages with comparable supply and temperature ranges, making the ADS1246IPWR a viable functional replacement candidate for the ADS1224IPWTG4 in many precision measurement applications. However, the two devices differ in input channel configuration, interface timing, and reference architecture, so the replacement must be validated against the specific system requirements before adoption.
Resolution and Architecture
High match
Input Channel Configuration
Validation required
Digital Interface
Validation required
Package and Supply Range
High match
Parts at a glance
Part B
ADS1224IPWTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4125 PCS
- Package
- TSSOP-20
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS1246IPWR | ADS1224IPWTG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not distinguish them for substitutability. |
| Number of input channels | 1 differential (2 single-ended) | 4 single-ended / 2 differential | Channel count determines how many signals can be measured; the ADS1224 offers more inputs, affecting system architecture. |
| Input type | Differential | Differential / single-ended | Single-ended capability in the ADS1224 allows more flexible sensor interfacing than the differential-only ADS1246. |
| Data rate (SPS) | Up to 2 kSPS | Up to 120 SPS | Higher sample rate in the ADS1246 supports faster-changing signals, while the ADS1224 suits slower precision measurements. |
| Interface | SPI | SPI | Both use SPI, so the digital host interface is compatible for direct substitution. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 2.7 V to 5.5 V | Slightly wider analog supply range on the ADS1224 gives more headroom in 5 V systems. |
| Internal PGA | Yes (gain 1 to 128) | No | The ADS1246's programmable gain amplifier allows direct connection of low-level sensors, which the ADS1224 cannot do without external gain. |
| Package | TSSOP-16 | TSSOP-20 | Different pin counts and footprints mean the two parts are not drop-in PCB replacements. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +85 °C | The ADS1246 supports a wider temperature range, making it preferable for harsh-environment applications. |
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 | ADS1246IPWR | ADS1224IPWTG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 2k | 240 |
| Number of Inputs | 1 | 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 ~ 5.25V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.5V |
| Features | PGA, Temperature Sensor | Temperature Sensor |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1246IPWR and ADS1224IPWTG4?
The ADS1246IPWR is a 24-bit delta-sigma ADC with a single differential input channel and an integrated PGA, offering programmable gains from 1 to 128. The ADS1224IPWTG4 is a 24-bit delta-sigma ADC featuring a 4-channel differential input multiplexer with a fixed gain of 1 and no integrated PGA. Both devices operate from a single 2.7 V to 5.25 V analog supply and communicate over an SPI-compatible serial interface.
Do the ADS1246IPWR and ADS1224IPWTG4 share the same package and pinout?
No. The ADS1246IPWR is supplied in a 20-pin TSSOP package (PW suffix), while the ADS1224IPWTG4 is supplied in a 20-pin TSSOP package as well (PW suffix), but the pin functions and internal signal routing differ between the two devices. The pinouts are not drop-in compatible, and PCB layouts must be designed for each device individually according to the respective datasheet pin assignments.
How do the input configurations of the ADS1246IPWR and ADS1224IPWTG4 differ?
The ADS1246IPWR provides a single differential input pair (AIN0/AIN1) with an integrated low-noise PGA supporting gains of 1, 2, 4, 8, 16, 32, 64, and 128. The ADS1224IPWTG4 provides a 4-channel differential input multiplexer (four differential pairs) with a fixed gain of 1, making it suited for multi-sensor systems where channel count matters more than programmable gain.
Which device is better suited for low-level sensor signals requiring gain?
The ADS1246IPWR is better suited for low-level sensor signals because its integrated PGA allows gains up to 128, enabling direct amplification of small differential signals such as those from thermocouples, RTDs, and bridge sensors. The ADS1224IPWTG4 has a fixed gain of 1, so external amplification would be required for very low-level signals.
Are the ADS1246IPWR and ADS1224IPWTG4 functionally interchangeable in an existing design?
No. Although both are 24-bit delta-sigma ADCs in 20-pin TSSOP packages with SPI interfaces, they differ in input architecture (single differential channel with PGA versus 4-channel differential multiplexer with fixed gain), register maps, and pin functions. A direct substitution is not possible without redesigning the analog front end, updating firmware for the different register set, and revising the PCB layout.
What are the data output rates of the ADS1246IPWR and ADS1224IPWTG4?
The ADS1246IPWR supports programmable data output rates from 5 SPS to 2 kSPS, selectable through its configuration registers. The ADS1224IPWTG4 supports data output rates from 20 SPS to 2 kSPS. Both devices use a delta-sigma modulator with a digital filter, and the exact rate selection is configured via the serial interface registers documented in each datasheet.
Do both devices support the same serial interface and supply voltage range?
Yes. Both the ADS1246IPWR and ADS1224IPWTG4 use an SPI-compatible serial interface for configuration and data readout, and both operate from a single analog supply voltage range of 2.7 V to 5.25 V. However, the register maps and command sets differ between the two devices, so firmware must be written specifically for each part.