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 ADS1212U are both 24-bit delta-sigma ADCs, but they differ in resolution architecture, interface type, package footprint, and supply voltage range, so the ADS1212U cannot serve as a direct drop-in substitute for the ADS1246IPW without redesign and validation.
Different interface type
Different package footprint
Different supply voltage range
Different input channel configuration
Parts at a glance
Part B
ADS1212U
Burr Brown
- Lifecycle
- Active
- Stock
- 3412 PCS
- Package
- SOIC-18
- 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 | ADS1212U | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 22 | Higher resolution provides finer measurement granularity; a 24-bit ADC resolves smaller signal changes than a 22-bit device. |
| Number of input channels | 1 differential | 1 differential | Both are single-channel differential devices, so channel count is not a differentiator for substitutability. |
| Maximum sample rate (SPS) | 2000 | 1000 | Sample rate determines how fast the ADC can capture changing signals; the ADS1246 supports roughly twice the throughput. |
| Interface type | SPI | SPI | Both use a serial SPI interface, simplifying drop-in replacement at the digital communication level. |
| Supply voltage (analog) | 2.7 V to 5.25 V | 2.7 V to 5.25 V | Matching analog supply ranges allow the parts to operate from the same power rail in a given design. |
| PGA / gain stages | Yes (1 to 128) | Yes (1 to 16) | Programmable gain amplifies small sensor signals; the ADS1246 offers a wider gain range for low-level inputs. |
| Package | TSSOP-16 | SOIC-18 | Different package footprints require PCB layout changes, affecting direct board-level substitution. |
| Operating temperature range | -40 °C to +105 °C | -40 °C to +85 °C | Wider temperature range suits harsher environments; the ADS1246 tolerates higher ambient temperatures. |
| Internal reference | Yes | No | An internal reference reduces external component count; the ADS1212 requires an external reference for accurate conversion. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1246IPW | ADS1212U |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 24 | 22 |
| Sampling Rate(Per Second) | 2k | 6.25k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential, Single Ended | Differential |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | 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 | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 5V |
| 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 ADS1246IPW and ADS1212U?
The ADS1246IPW is a 24-bit delta-sigma ADC with a single-channel input multiplexer, integrated PGA, and internal oscillator, housed in a TSSOP-16 package. The ADS1212U is a 22-bit delta-sigma ADC with a single differential input, external clock requirement, and is offered in a SOIC-18 package. The ADS1246IPW integrates more front-end functionality, while the ADS1212U provides 22-bit resolution with a simpler single-channel architecture.
Do the ADS1246IPW and ADS1212U have the same resolution and accuracy specifications?
No. The ADS1246IPW provides 24-bit resolution, while the ADS1212U provides 22-bit resolution. Both are delta-sigma converters, but their noise-free resolution and effective number of bits differ per their respective datasheets, so accuracy budgets must be evaluated separately for each device.
Can the ADS1246IPW and ADS1212U operate from the same supply voltage?
The ADS1246IPW operates from a single analog supply of 2.7 V to 5.25 V and a digital supply of 2.7 V to 5.25 V. The ADS1212U operates from a single +5 V analog supply with a +3.3 V or +5 V digital supply. Designs migrating between the two must verify supply rail compatibility against the respective datasheets.
Are the ADS1246IPW and ADS1212U pin-compatible?
No. The ADS1246IPW is packaged in a 16-pin TSSOP, while the ADS1212U is packaged in an 18-pin SOIC. The pin counts, pin functions, and package footprints differ, so these devices are not drop-in replacements and require separate PCB layouts.
How do the input configurations of the ADS1246IPW and ADS1212U differ?
The ADS1246IPW includes an input multiplexer supporting multiple single-ended and differential input configurations with an integrated PGA. The ADS1212U provides a single differential input channel without an integrated input multiplexer. System-level channel count and signal conditioning requirements should be matched to the appropriate device.
Do both the ADS1246IPW and ADS1212U support an external reference voltage?
Yes. Both devices support an external reference voltage input for ratiometric or absolute measurement configurations. The reference input range and recommended reference source should be verified against each device's datasheet for the target application.
What communication interfaces do the ADS1246IPW and ADS1212U use?
The ADS1246IPW uses an SPI-compatible serial interface. The ADS1212U uses a synchronous serial interface compatible with SPI. Both support microcontroller-based data acquisition, but the command sets and timing requirements differ and must be implemented per each datasheet.
Which device is better suited for low-power, portable sensor applications?
The ADS1246IPW is specified for low-power operation with supply voltages down to 2.7 V and includes an internal oscillator and PGA, which can reduce external component count in portable designs. The ADS1212U requires a +5 V analog supply and an external clock, which may increase system power and complexity. Final selection should be based on the power budget and signal chain requirements verified in the datasheets.