Part A
ADS1246IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 6549 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1220IPWR and ADS1246IPW share the same TSSOP-16 footprint and a comparable SPI-compatible serial interface, making the ADS1220IPWR a viable functional replacement candidate for the ADS1246IPW in many precision sensor measurement designs. However, the ADS1220IPWR integrates a flexible input multiplexer with two differential or four single-ended channels plus an internal PGA and IDAC current sources, whereas the ADS1246IPW is a single-channel device without an input MUX. Engineers must validate channel configuration, PGA gain range, and reference/supply arrangements against the target application before substituting.
Package Type
High match
Resolution
High match
Input Channel Configuration
Validation required
Integrated Features
Validation required
Parts at a glance
Part B
ADS1220IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6260 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 | ADS1220IPWR | ADS1246IPW | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution is equivalent for high-precision sensing applications. |
| Number of input channels | 4 (2 differential / 4 single-ended) | 1 differential | The ADS1220 supports multiple inputs for multi-sensor designs, while the ADS1246 is limited to a single differential channel. |
| Programmable gain amplifier (PGA) gain range | 1 to 128 V/V | 1 to 128 V/V | Both offer wide PGA gain for small-signal measurements; equivalent gain range supports similar low-level sensor interfacing. |
| Data rate (max SPS) | 2000 SPS | 2000 SPS | Identical maximum output data rate means comparable throughput for dynamic measurement needs. |
| Interface | SPI | SPI | Both use SPI, simplifying drop-in compatibility with the same host microcontroller bus. |
| Supply voltage (analog) | 2.3 V to 5.5 V | 2.7 V to 5.25 V | The ADS1220 supports a slightly wider and lower analog supply range, which can matter for low-voltage or battery-powered systems. |
| Internal reference | Yes (2.048 V) | Yes (2.048 V) | Both integrate a precision reference, reducing external component count and board space. |
| Package | TSSOP-16 | TSSOP-16 | Identical package footprint allows potential PCB layout reuse between the two parts. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +125 °C | Same industrial temperature range supports use in harsh environments for both devices. |
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 | ADS1220IPWR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 2k | 2k |
| Number of Inputs | 1 | 2, 4 |
| 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, Supply |
| Voltage - Supply, Analog | 2.7V ~ 5.25V | 2.3V ~ 5.5V, ±2.5 |
| Voltage - Supply, Digital | 2.7V ~ 5.25V | 2.3V ~ 5.5V |
| Features | PGA, Temperature Sensor | PGA, Temperature Sensor |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
Frequently asked questions
What are the primary differences between the ADS1220IPWR and ADS1246IPW?
The ADS1220IPWR is a 24-bit, 4-channel delta-sigma ADC with an integrated PGA, VREF, oscillator, and SPI interface in a TSSOP-16 package. The ADS1246IPW is a 24-bit, single-channel delta-sigma ADC with an integrated PGA and SPI interface in a TSSOP-16 package. The ADS1220 provides four input channels (two differential or four single-ended) and an internal 2.048 V reference, while the ADS1246 offers a single differential input channel and requires an external reference voltage.
Are the ADS1220IPWR and ADS1246IPW pin-compatible?
No. Although both devices are housed in a TSSOP-16 package, their pin functions differ. The ADS1220IPWR assigns pins to four analog inputs (AIN0–AIN3), while the ADS1246IPW uses a single differential input pair (AIN0/AIN1) with additional pins dedicated to external reference inputs (REFP/REFN). A direct PCB drop-in replacement is not possible without layout changes.
Do both devices support an internal reference voltage?
No. The ADS1220IPWR includes an internal 2.048 V reference with selectable gain, allowing ratiometric or absolute measurements without an external reference. The ADS1246IPW does not integrate a reference and requires an external differential reference voltage applied to the REFP and REFN pins.
What are the maximum data output rates for each device?
The ADS1220IPWR supports programmable data rates up to 2 kSPS in normal mode and up to 2 kSPS in turbo mode (with 20 SPS, 45 SPS, 90 SPS, 175 SPS, 330 SPS, 600 SPS, and 1000 SPS also selectable). The ADS1246IPW supports data rates from 5 SPS to 2 kSPS, programmable via the SPI interface.
Can both ADCs operate from a single 3.3 V supply?
Yes. Both the ADS1220IPWR and ADS1246IPW support analog supply voltages from 2.7 V to 5.5 V and digital supply voltages from 2.7 V to 5.5 V, allowing operation from a single 3.3 V rail. However, the ADS1246IPW requires the external reference voltage to remain within the analog supply range.
Which device is better suited for multi-channel sensor applications?
The ADS1220IPWR is better suited for multi-channel sensor applications because it provides four analog inputs configurable as two differential or four single-ended channels, an internal reference, and an integrated oscillator. The ADS1246IPW provides only one differential input channel and is intended for single-sensor, high-resolution measurement designs.
Do both devices include a programmable gain amplifier (PGA)?
Yes. Both the ADS1220IPWR and ADS1246IPW integrate a low-noise PGA with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128. The PGA allows direct connection of low-level sensor outputs, such as thermocouples or bridge sensors, without external amplification.
What communication interface do these ADCs use?
Both the ADS1220IPWR and ADS1246IPW use a 4-wire SPI-compatible serial interface (SCLK, DIN, DOUT, and CS) for configuration and data readout. The interface supports daisy-chain operation and is compatible with standard microcontroller SPI peripherals.