Part A
ADS1247IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 3449 Stückzahl
- Package
- TSSOP-20
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1247IPWR and ADS1224IPWTG4 are both 24-bit delta-sigma ADCs from Texas Instruments sharing a TSSOP-20 footprint and similar supply architecture, making the ADS1247IPWR a plausible functional substitute for the ADS1224IPWTG4 in many precision sensor applications. However, the ADS1247IPWR integrates a programmable gain amplifier and offers a wider input configuration range, while the ADS1224IPWTG4 provides a fixed-gain, lower-power signal chain. Designers must validate input range, gain configuration, and reference requirements against the target application before committing to a drop-in substitution.
Resolution and ADC Architecture
High match
Package and Pin Configuration
High match
Input Configuration and Gain
Validation required
Supply Voltage and Power
Validation required
Parts at a glance
Part B
ADS1224IPWTG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4125 Stückzahl
- Package
- TSSOP-20
- Series
- Datenerfassung mit Analog to Digital Converters (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 | ADS1247IPWR | 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 | 4 (2 differential / 4 single-ended) | 4 (2 differential / 4 single-ended) | Channel count determines how many sensor inputs can be multiplexed without external switching. |
| Input type | Differential / single-ended | Differential / single-ended | Input configuration affects whether the part can directly interface differential bridge sensors or single-ended signals. |
| PGA gain stages | 1 to 128 | 1 to 128 | Programmable gain allows small sensor signals to be amplified to use the full ADC range. |
| Data rate (SPS) | Up to 2000 | Up to 2000 | Maximum sample rate sets the achievable measurement bandwidth and noise trade-off. |
| Supply voltage | 2.7 V to 5.25 V (analog and digital) | 2.7 V to 5.25 V (analog and digital) | Supply range must match the system rail to avoid level shifting or regulator changes. |
| Interface | SPI | SPI | Serial interface compatibility determines whether the host firmware and bus wiring can be reused. |
| Package | TSSOP-20 | TSSOP-20 | Package footprint and pinout must match for a drop-in board replacement. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +125 °C | Temperature range must cover the application environment for reliable operation. |
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 | ADS1247IPWR | 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 | 2, 3 | 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, Internal | 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 primary functional differences between the ADS1247IPWR and ADS1224IPWTG4?
The ADS1247IPWR is a 24-bit, 4-channel delta-sigma ADC with an integrated programmable gain amplifier (PGA), a precision voltage reference, and an internal oscillator, housed in a TSSOP-20 package. The ADS1224IPWTG4 is a 24-bit, 4-channel delta-sigma ADC without an integrated PGA or voltage reference, housed in a TSSOP-20 package. The ADS1247 integrates more analog front-end functionality, while the ADS1224 requires external signal conditioning and reference components.
Are the ADS1247IPWR and ADS1224IPWTG4 pin-compatible?
No. Although both devices are offered in a TSSOP-20 package, their pin functions and internal architectures differ. The ADS1247IPWR includes PGA and reference-related pins that are not present on the ADS1224IPWTG4. A direct PCB drop-in replacement is not supported without schematic and layout changes.
What are the input channel configurations of each device?
The ADS1247IPWR provides four analog inputs that can be configured as four single-ended inputs or two differential inputs. The ADS1224IPWTG4 provides four analog inputs configurable as four single-ended or two differential inputs. Both devices support differential and single-ended measurement topologies, but the ADS1247 adds an integrated PGA ahead of the modulator.
Do both devices include an internal voltage reference?
No. The ADS1247IPWR includes an integrated precision voltage reference. The ADS1224IPWTG4 does not include an internal voltage reference and requires an external reference for ratiometric or absolute measurements. This difference affects system accuracy, BOM count, and board space.
How do the data output rates compare between the ADS1247IPWR and ADS1224IPWTG4?
Both devices are delta-sigma ADCs with programmable output data rates suitable for precision sensor measurement. The ADS1247IPWR supports programmable data rates up to 2 kSPS. The ADS1224IPWTG4 supports data rates up to 120 SPS. The ADS1247IPWR offers a higher maximum data rate, making it better suited for applications requiring faster settling, while the ADS1224IPWTG4 targets low-speed, high-resolution measurements.
What are the supply voltage requirements for these ADCs?
The ADS1247IPWR operates from an analog supply of 2.7 V to 5.25 V and a digital supply of 2.7 V to 5.25 V. The ADS1224IPWTG4 operates from a single supply of 2.7 V to 5.5 V. Both devices are compatible with common 3.3 V and 5 V system rails, but the ADS1247IPWR provides separate analog and digital supply pins for noise isolation.
Which device is better suited for directly interfacing with a bridge sensor?
The ADS1247IPWR is generally better suited for direct bridge sensor interfacing because it integrates a low-noise PGA and a precision voltage reference, allowing small differential bridge outputs to be amplified and digitized without external signal-conditioning ICs. The ADS1224IPWTG4 lacks an integrated PGA and reference, so bridge sensor applications require external amplification and reference circuitry.
Do both devices support SPI communication?
Yes. Both the ADS1247IPWR and ADS1224IPWTG4 provide an SPI-compatible serial interface for configuration and data readback. The ADS1247IPWR supports SPI modes with dedicated DRDY, CS, SCLK, DIN, and DOUT signals. The ADS1224IPWTG4 also uses an SPI-compatible interface. System designers should verify timing and mode requirements against the respective datasheets.
Can the ADS1224IPWTG4 be used as a drop-in replacement for the ADS1247IPWR in an existing design?
No. The ADS1224IPWTG4 is not a drop-in replacement for the ADS1247IPWR. Differences in integrated PGA, internal reference, pin functions, register map, and maximum data rate require schematic, layout, and firmware changes. A replacement should only be considered after validating all electrical and functional differences against the manufacturer datasheets.