Part A
ADS1248IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2446 Stückzahl
- Package
- TSSOP-28
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1248IPW and ADS1241E/1KG4 are both 24-bit delta-sigma ADCs, but they differ in resolution architecture, channel count, package footprint, and interface configuration, so the ADS1241E/1KG4 cannot be used as a direct drop-in substitute for the ADS1248IPW without design validation.
Different channel count
Different package footprint
Different interface configuration
Different reference architecture
Parts at a glance
Part B
ADS1241E/1KG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 7404 Stückzahl
- Package
- SSOP-28
- 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 | ADS1248IPW | ADS1241E/1KG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 8 (4 differential) | 8 (4 differential) | Channel count determines how many sensor inputs can be multiplexed without external switching. |
| Interface | SPI | SPI | A matching serial interface allows drop-in compatibility with the host microcontroller bus. |
| PGA gain range | 1 to 128 | 1 to 128 | Programmable gain affects the smallest signal that can be resolved without external amplification. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Compatible analog supply ranges allow the same power rail design to be reused. |
| Package | TSSOP-28 | SSOP-28 | Different package footprints require PCB layout changes and affect mechanical substitutability. |
| Internal reference | Yes | No | An internal reference simplifies the design; its absence requires an external precision reference. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +85 °C | A wider temperature range supports harsher environments and affects reliability margins. |
| Data rate (max) | 2 kSPS | 1 kSPS | Maximum sample rate limits how fast signals can be acquired in the application. |
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/1KG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| 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 key architectural differences between the ADS1248IPW and the ADS1241E/1KG4?
The ADS1248IPW is a 24-bit, 8-channel (4 differential) delta-sigma ADC with an integrated PGA, programmable current sources, and a built-in oscillator, housed in a TSSOP-28 package. The ADS1241E/1KG4 is a 24-bit, 8-channel (4 differential) delta-sigma ADC with a fixed-gain PGA, housed in a SSOP-28 package and supplied in tape-and-reel form. The ADS1248 offers a wider programmable gain range and more integrated excitation/current-source features, while the ADS1241 provides a simpler fixed-gain signal chain.
Are the ADS1248IPW and ADS1241E/1KG4 pin-compatible or package-compatible?
No. The ADS1248IPW uses a TSSOP-28 package, while the ADS1241E/1KG4 uses a SSOP-28 package. Although both are 28-pin devices, the package body dimensions and lead pitch differ, so PCB land patterns are not interchangeable. Pin functions and assignments also differ between the two devices, so they cannot be treated as drop-in replacements.
Can the ADS1248IPW directly replace the ADS1241E/1KG4 in an existing design?
Not directly. Beyond the package and pinout differences, the two devices differ in PGA architecture (programmable vs. fixed gain), register map, and integrated feature set. A replacement requires schematic, layout, and firmware changes, and all differences must be validated against the respective manufacturer datasheets before substitution.
How do the PGA and gain options compare between the ADS1248IPW and ADS1241E/1KG4?
The ADS1248IPW integrates a programmable gain amplifier with selectable gains (1 to 128) for low-level signal conditioning. The ADS1241E/1KG4 uses a fixed-gain PGA architecture. Designs requiring software-selectable gain scaling across a wide range should favor the ADS1248, while fixed-gain applications may suit the ADS1241.
Do both devices support the same number of input channels?
Yes. Both the ADS1248IPW and ADS1241E/1KG4 provide 8 input channels configurable as 4 differential inputs, making them comparable for multi-channel sensor measurement applications. Channel configuration is performed through each device's respective register interface.
What are the supply voltage and resolution specifications for these ADCs?
Both devices are 24-bit delta-sigma ADCs. The ADS1248IPW operates from an analog supply in the 2.7 V to 5.25 V range with a digital supply of 2.7 V to 5.25 V. The ADS1241E/1KG4 operates from a single 2.7 V to 5.25 V supply. Designers should confirm exact supply and reference requirements against the official datasheets for each part.
Which device is better suited for RTD and thermocouple measurement systems?
The ADS1248IPW is generally favored for RTD and thermocouple systems because it integrates programmable current sources for RTD excitation, a programmable PGA for low-level thermocouple signals, and a built-in oscillator. The ADS1241E/1KG4 can also be used in sensor measurement but lacks the same level of integrated excitation and programmable gain flexibility, so external circuitry may be required.
What ordering and packaging differences exist between ADS1248IPW and ADS1241E/1KG4?
The ADS1248IPW is supplied in a TSSOP-28 tube/tray format, while the ADS1241E/1KG4 is supplied in a SSOP-28 tape-and-reel format (the "1K" suffix indicates a 1,000-unit reel). Buyers should verify current packaging and MOQ details with authorized distributors such as DigiKey, Mouser, or the manufacturer before ordering.