Part A
ADS1248IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2446 PCS
- Package
- TSSOP-28
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1246IPW and ADS1248IPW share the same TSSOP-28 package, SPI interface, and core 24-bit delta-sigma ADC architecture, making the ADS1248IPW a viable functional upgrade path where additional input channels and integrated excitation current sources are beneficial. Designers should validate channel-count requirements, PGA gain range, and reference configuration against the target application before committing to a drop-in substitution.
Package Type
High match
Digital Interface
High match
Input Channel Count
Validation required
PGA Gain Range
Validation required
Parts at a glance
Part B
ADS1246IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 6549 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (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 | ADS1246IPW | ADS1248IPW | Why it matters |
|---|---|---|---|
| Number of input channels (differential) | 1 | 4 | Determines how many independent analog signals can be measured; a 4-channel device can replace a 1-channel device only if the extra channels are unused. |
| Number of input channels (single-ended) | 2 | 8 | Affects system-level channel count for single-ended sensor arrays; fewer channels may require external multiplexing. |
| Programmable gain amplifier (PGA) gain range | 1 to 128 | 1 to 128 | PGA gain sets the smallest resolvable input signal; identical gain ranges mean similar low-level signal capability. |
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so nominal resolution and dynamic range class are equivalent. |
| Data rate (SPS) | 5 to 2000 | 5 to 2000 | Output data rate affects noise versus speed trade-off; matching ranges support similar throughput requirements. |
| Internal reference | Yes | Yes | An internal reference reduces external component count and board space; both devices offer it. |
| 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 for either part. |
| Package | TSSOP-16 | TSSOP-28 | Different package footprints and pin counts prevent direct drop-in replacement without PCB redesign. |
| Interface | SPI | SPI | Both use SPI, so the digital host interface and firmware protocol are compatible. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +105 °C | Identical temperature ratings mean both suit the same industrial 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 | ADS1248IPW | ADS1246IPW |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 2k | 2k |
| Number of Inputs | 4, 7 | 1 |
| 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, Internal |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.7V ~ 5.25V |
| Features | PGA, Temperature Sensor | PGA, Temperature Sensor |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 105°C |
Frequently asked questions
What is the primary difference between the ADS1246IPW and ADS1248IPW?
The ADS1246IPW is a 16-bit, single-channel delta-sigma ADC, while the ADS1248IPW is a 24-bit, 8-channel (4 differential) delta-sigma ADC. The ADS1248IPW offers higher resolution and more input channels, whereas the ADS1246IPW provides a simpler single-channel solution.
Are the ADS1246IPW and ADS1248IPW pin-compatible?
No. Both devices are offered in a 28-pin TSSOP (PW) package, but the pin functions differ because the ADS1248IPW provides additional input channels and internal multiplexer control pins. The ADS1246IPW does not populate all input channel pins, so the two are not drop-in replacements.
Do both devices share the same PGA and reference architecture?
Yes. Both the ADS1246IPW and ADS1248IPW integrate a low-noise programmable gain amplifier (PGA) and support external reference inputs, allowing ratiometric measurement configurations. Both also include an internal oscillator and SPI-compatible serial interface.
What are the resolution and data rate specifications for each device?
The ADS1246IPW provides 16-bit resolution, and the ADS1248IPW provides 24-bit resolution. Both devices support programmable data output rates up to 2 kSPS, with the exact rate configured through the SPI interface registers.
Can the ADS1246IPW be used as a substitute for the ADS1248IPW in an existing design?
Not directly. The ADS1248IPW supports up to 8 single-ended or 4 differential inputs, while the ADS1246IPW supports only a single differential input. Substitution requires verifying channel count, resolution, pinout, and firmware register compatibility against the respective datasheets.
What supply voltage range do the ADS1246IPW and ADS1248IPW support?
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, per the manufacturer datasheet. This allows direct interfacing with 3.3 V and 5 V logic systems.
Which applications typically favor the ADS1248IPW over the ADS1246IPW?
The ADS1248IPW is preferred for multi-channel sensor systems such as RTD, thermocouple, and strain-gauge arrays that require 24-bit resolution and multiple differential inputs. The ADS1246IPW suits single-channel precision measurement designs where 16-bit resolution is sufficient.