Part A
ADS1248IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2446 PCS
- Package
- TSSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1248IPW is a viable functional replacement candidate for the ADS1241E, offering a higher channel count and integrated PGA while maintaining a comparable SPI interface and TSSOP package footprint. However, designers must validate the different resolution, data rate, and reference architecture against the specific application requirements before substitution.
Resolution
Validation required
Channel Count
Validation required
Interface Type
High match
Package Type
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1241E | ADS1248IPW | 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 | 8 single-ended / 4 differential | 8 single-ended / 4 differential | Channel count determines how many sensors can be multiplexed without external switching hardware. |
| Programmable gain amplifier (PGA) range | 1 to 128 | 1 to 128 | PGA gain range sets the smallest differential signal the ADC can resolve, affecting low-level sensor compatibility. |
| Data output interface | SPI (serial peripheral interface) | SPI (serial peripheral interface) | Interface compatibility determines whether the part can drop into an existing microcontroller bus without firmware changes. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Analog supply range must match the system rail to avoid level shifting or regulator redesign. |
| Package | SSOP-28 | TSSOP-28 | Different package footprints require PCB layout changes, so they are not drop-in replacements. |
| Internal reference | No (external reference required) | Yes (internal 2.048 V reference) | An internal reference simplifies the design and reduces external component count, affecting board area and BOM. |
| Internal temperature sensor | No | Yes | A built-in temperature sensor enables cold-junction compensation and system diagnostics without extra parts. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +105 °C | A wider temperature range allows use in harsher industrial environments where the other part may be marginal. |
| Current consumption (typical) | ~1.5 mA | ~2.3 mA | Higher supply current affects power budget and thermal design in battery-powered or dense systems. |
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 | ADS1248IPW | ADS1241E |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 2k | 15 |
| Number of Inputs | 4, 7 | 8 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-PGA-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 ~ 3.3V, 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Features | PGA, Temperature Sensor | PGA |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the ADS1241E and ADS1248IPW?
The ADS1241E is a 24-bit delta-sigma ADC with a single differential input channel (or two single-ended inputs) in a 28-pin TSSOP package, while the ADS1248IPW is a 24-bit delta-sigma ADC with an 8-channel input multiplexer (4 differential or 8 single-ended inputs), a programmable gain amplifier, and an integrated 2.0 V reference in a 28-pin TSSOP package. The ADS1248IPW offers more input channels, an integrated voltage reference, and a wider feature set for multi-sensor applications.
Are the ADS1241E and ADS1248IPW pin-compatible?
No. Although both devices are offered in a 28-pin TSSOP package, their pin functions and internal architectures differ. The ADS1248IPW includes additional multiplexer inputs, reference pins, and GPIO/control pins that are not present or are assigned differently on the ADS1241E. A direct PCB drop-in replacement is not supported without design changes.
What is the resolution and data rate of each device?
Both the ADS1241E and ADS1248IPW are 24-bit delta-sigma ADCs. The ADS1241E supports programmable data output rates up to 1 kSPS. The ADS1248IPW supports programmable data rates from 5 SPS to 2 kSPS. Both devices use a delta-sigma modulator architecture suitable for low-frequency, high-resolution sensor measurement.
Does the ADS1248IPW include an integrated voltage reference that the ADS1241E lacks?
Yes. The ADS1248IPW integrates a 2.0 V reference with low drift, selectable as the conversion reference. The ADS1241E does not include an internal voltage reference and requires an external reference for ratiometric or absolute measurements. This is a significant difference for designs seeking to minimize external component count.
How do the input multiplexer capabilities compare?
The ADS1241E provides a single differential input pair (two single-ended inputs) with no input multiplexer. The ADS1248IPW includes an 8-channel input multiplexer supporting 4 differential or 8 single-ended inputs, allowing multiple sensors to be connected to one ADC. For multi-channel systems, the ADS1248IPW reduces board space and component count compared to using multiple ADS1241E devices.
Do both devices support a programmable gain amplifier (PGA)?
Yes. Both the ADS1241E and ADS1248IPW include a low-noise programmable gain amplifier. The ADS1241E provides selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128. The ADS1248IPW provides selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128 as well. The PGA allows direct connection of low-level sensor outputs such as thermocouples and bridge sensors.
What are the supply voltage and power consumption characteristics of each device?
Both devices operate from an analog supply (AVDD) of 2.7 V to 5.25 V and a digital supply (DVDD) of 2.7 V to 5.25 V. The ADS1241E typically consumes approximately 1.5 mW at 3 V in normal operation. The ADS1248IPW typically consumes approximately 2.3 mW at 3 V. Both devices offer power-down modes to reduce consumption when not converting.
Which device is better suited for multi-sensor or multi-channel applications?
The ADS1248IPW is better suited for multi-sensor applications because its 8-channel input multiplexer, integrated 2.0 V reference, and GPIO pins allow multiple sensors to be measured by a single device with fewer external components. The ADS1241E, with only one differential input channel and no internal reference, is better suited to single-sensor, space-constrained designs where its simpler architecture is sufficient.