Part A
ADS1246IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 6549 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1246IPW and ADS1282HIPW are not functionally interchangeable. The ADS1246IPW is a 24-bit, 2 kSPS delta-sigma ADC with a single differential input and an SPI interface, while the ADS1282HIPW is a 31-bit, 4 kSPS delta-sigma ADC with dual differential inputs, a built-in PGA, and a different pinout and supply architecture. The differences in resolution, sample rate, channel count, and package pinout prevent direct substitution without a full redesign of the signal chain and board layout.
Different resolution and sample rate
Different channel count
Different package pinout
Different supply architecture
Parts at a glance
Part B
ADS1282HIPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 6044 PCS
- Package
- TSSOP-28
- 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 | ADS1282HIPW | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 31 | Higher resolution enables finer measurement of small signal changes, which is critical for precision seismic and high-dynamic-range 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 captured and affects anti-aliasing requirements. |
| PGA gain range | 1 to 128 | 1 to 64 | Programmable gain allows small-amplitude signals to be amplified to use the full ADC range, improving effective resolution. |
| Supply voltage | 2.7 V to 5.25 V (analog and digital) | 5 V analog, 1.8 V to 3.3 V digital | Supply requirements determine power-rail compatibility and whether level shifting is needed in a given system. |
| Interface type | SPI | SPI | Both use SPI, so the host microcontroller interface is compatible, but register maps and command sets differ. |
| Package | TSSOP-16 | TSSOP-28 | Package footprint and pin count affect PCB layout and whether a drop-in replacement is possible. |
| 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 | Differential-only inputs improve common-mode rejection but require different sensor wiring than single-ended inputs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1246IPW | ADS1282HIPW |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Part Status | Active | Active |
| Number of Bits | 24 | - |
| Sampling Rate(Per Second) | 2k | - |
| Number of Inputs | 1 | - |
| Input Type | Differential, Single Ended | - |
| Data Interface | SPI | - |
| Configuration | MUX-PGA-ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External, Internal | - |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | - |
| Features | PGA, Temperature Sensor | - |
| Operating Temperature | -40°C ~ 105°C | - |
Frequently asked questions
What are the primary differences between the ADS1246IPW and ADS1282HIPW?
The ADS1246IPW is a 24-bit, 2-kSPS delta-sigma ADC with a single differential input and integrated PGA, housed in a 20-pin TSSOP. The ADS1282HIPW is a 31-bit, 4-kSPS delta-sigma ADC with dual differential inputs, integrated PGA, and a high-resolution architecture, housed in a 28-pin TSSOP. The ADS1282HIPW targets high-resolution seismic and energy exploration applications, while the ADS1246IPW targets general-purpose precision sensor measurement.
Are the ADS1246IPW and ADS1282HIPW pin-compatible?
No. The ADS1246IPW uses a 20-pin TSSOP (PW) package, while the ADS1282HIPW uses a 28-pin TSSOP (PW) package. The pin counts and pin functions differ, so they are not drop-in replacements and require different PCB land patterns.
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 ADS1282HIPW provides 31-bit resolution with programmable data rates up to 4 kSPS. The ADS1282HIPW offers higher resolution and a faster maximum output rate than the ADS1246IPW.
How do the input configurations of the ADS1246IPW and ADS1282HIPW differ?
The ADS1246IPW has a single differential input channel with an integrated PGA. The ADS1282HIPW provides two differential input channels with an integrated PGA, allowing multiplexed measurement of two sensor signals without external switching.
Do both devices include an integrated programmable gain amplifier (PGA)?
Yes. Both the ADS1246IPW and ADS1282HIPW integrate a programmable gain amplifier. The PGA gain settings and ranges should be verified against the respective manufacturer datasheets, as the available gain options and input voltage ranges differ between the two devices.
What are the typical target applications for the ADS1246IPW versus the ADS1282HIPW?
The ADS1246IPW is typically used in general-purpose precision sensor measurement, industrial process control, and portable instrumentation. The ADS1282HIPW is designed for high-resolution seismic data acquisition, energy exploration, and precision geophysical measurement where 31-bit resolution and dual input channels are required.
Can the ADS1246IPW be used as a substitute for the ADS1282HIPW in an existing design?
No, not as a direct substitute. The devices differ in package pin count (20 vs 28 pins), resolution (24-bit vs 31-bit), maximum data rate (2 kSPS vs 4 kSPS), and input channel count (single vs dual differential). Any substitution requires a full design review against the manufacturer datasheets, including PCB layout, timing, and system accuracy requirements.