Part A
ADS1246IPW
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 6549 個数
- Package
- TSSOP-16
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1246IPW and ADS1282IPWG4 are both 24-bit delta-sigma ADCs in TSSOP packages, but they differ fundamentally in resolution architecture, input channel configuration, interface protocol, and target application class. The ADS1246IPW is a single-channel, SPI-compatible sensor ADC, while the ADS1282IPWG4 is a dual-channel, high-resolution seismic-grade converter with a different serial interface and clocking scheme. These differences in channel count, output data rate, interface type, and functional feature set prevent direct substitution without redesign of the surrounding circuitry and firmware.
Different channel count
Different interface protocol
Different data rate class
Different application grade
Parts at a glance
Part B
ADS1282IPWG4
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 2429 個数
- Package
- TSSOP-28
- Series
- データ取得 - アナログ/デジタルコンバータ (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 | ADS1282IPWG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 31 | Higher resolution enables finer measurement of small signal changes, which is critical for precision sensing applications. |
| Number of input channels | 1 (single-ended/differential) | 2 (differential) | Channel count determines how many signal sources can be measured without external multiplexing. |
| Maximum sample rate | 2 kSPS | 4 kSPS | Sample rate limits the bandwidth of signals that can be accurately digitized. |
| Interface type | SPI | SPI | Both use SPI, so the digital host connection is functionally compatible. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 4.75 V to 5.25 V (analog), 2.7 V to 3.6 V (digital) | Supply requirements affect power design and compatibility with the system rail voltages. |
| PGA / gain stage | Yes (PGA, gains 1 to 128) | Yes (PGA, gains 1 to 64) | An integrated PGA allows direct amplification of low-level sensor signals, reducing external components. |
| Package | 16-pin TSSOP | 28-pin TSSOP | Package footprint and pin count affect PCB layout and mechanical compatibility. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +85 °C | Temperature range determines suitability for harsh or industrial environments. |
| Input type | Single-ended or differential | Differential | Input configuration affects noise immunity and how sensors can be connected. |
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 | ADS1246IPW | ADS1282IPWG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 31 |
| Sampling Rate(Per Second) | 2k | 4k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | 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 | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 1.65V ~ 3.6V |
| 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 ADS1246IPW and ADS1282IPWG4?
The ADS1246IPW is a 24-bit, single-channel delta-sigma ADC with a programmable gain amplifier, offering data rates up to 2 kSPS and housed in a 20-pin TSSOP. The ADS1282IPWG4 is a 31-bit, dual-channel delta-sigma ADC designed for seismic and high-resolution measurement applications, featuring data rates up to 4 kSPS and packaged in a 28-pin TSSOP. The ADS1282IPWG4 provides higher resolution and an additional channel, while the ADS1246IPW targets general-purpose precision sensor measurement.
Are the ADS1246IPW and ADS1282IPWG4 pin-to-pin compatible?
No. The ADS1246IPW uses a 20-pin TSSOP package, while the ADS1282IPWG4 uses a 28-pin TSSOP package. The differing pin counts and pin functions prevent direct pin-to-pin substitution; each requires its own PCB land pattern and layout.
What are the resolution and data rate specifications of each device?
The ADS1246IPW provides 24-bit resolution with programmable data rates up to 2 kSPS. The ADS1282IPWG4 provides 31-bit resolution with data rates up to 4 kSPS. The ADS1282IPWG4 is therefore suited to higher-resolution, higher-speed precision applications such as seismic data acquisition.
How do the input channel configurations differ between the two ADCs?
The ADS1246IPW is a single-channel delta-sigma ADC with a PGA for direct sensor interfacing. The ADS1282IPWG4 provides two differential input channels, enabling simultaneous or multiplexed dual-channel high-resolution measurements. Designs requiring multiple channels should account for this difference.
Can the ADS1246IPW be used as a drop-in replacement for the ADS1282IPWG4?
No. Beyond the package and pin count differences (20-pin vs 28-pin TSSOP), the two devices differ in resolution (24-bit vs 31-bit), channel count (single vs dual), and maximum data rate (2 kSPS vs 4 kSPS). A direct replacement is not possible without redesign and validation against the manufacturer datasheets.
What are the typical application areas for each device?
The ADS1246IPW is typically used in general-purpose precision sensor measurement, industrial process control, and portable instrumentation where a single high-resolution channel is sufficient. The ADS1282IPWG4 is intended for high-resolution seismic and energy exploration data acquisition, precision dual-channel measurement, and applications demanding 31-bit resolution.
Do both devices support SPI-compatible serial interfaces?
Yes. Both the ADS1246IPW and ADS1282IPWG4 provide SPI-compatible serial interfaces for configuration and data readout, allowing connection to common microcontrollers and digital signal processors. Designers should confirm timing and mode requirements in the respective manufacturer datasheets.