Part A
ADS1232IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 7294 PCS
- Package
- TSSOP-24
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1232IPW and ADS1222IPWRG4 share a common TSSOP-24 footprint and 24-bit delta-sigma architecture, making the ADS1222IPWRG4 a viable functional candidate for the ADS1232IPW in low-channel-count precision sensing designs. However, the ADS1232IPW integrates a low-noise PGA and higher sample rate suited to bridge and weigh-scale applications, while the ADS1222IPWRG4 offers a simpler front end without an integrated PGA. Engineers should validate gain-stage requirements, reference configuration, and firmware timing before adopting the ADS1222IPWRG4 as a substitute.
Package Type
High match
Resolution
High match
Integrated PGA
Validation required
Sample Rate
Not compatible
Parts at a glance
Part B
ADS1222IPWRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4722 PCS
- Package
- TSSOP-14
- 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 | ADS1232IPW | ADS1222IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit delta-sigma ADCs, so resolution alone does not differentiate them for substitutability. |
| Number of input channels | 2 differential (4 single-ended) | 2 differential | Channel count determines how many sensor signals can be measured; the ADS1232 offers more flexible input configurations. |
| Input type / PGA | Integrated PGA, gain 1 to 128 | No integrated PGA (external gain required) | An integrated PGA allows direct connection of low-level sensors such as load cells without external amplification, affecting system complexity and BOM. |
| Data rate (SPS) | 10 or 80 SPS (selectable) | Up to 2 kSPS (programmable) | Data rate affects measurement speed and noise trade-off; the ADS1222 supports much higher throughput for faster-changing signals. |
| Supply voltage | 2.7 V to 5.3 V (analog and digital) | 2.7 V to 5.5 V | Supply range determines compatibility with the system power rail; both are broadly compatible with 3 V and 5 V systems. |
| Interface | SPI-compatible (2-wire, read-only) | SPI-compatible (2-wire) | Interface compatibility affects whether the part can drop into an existing digital bus without firmware or hardware changes. |
| Package | TSSOP-24 | TSSOP-16 | Different package footprints and pin counts prevent direct PCB drop-in replacement without layout changes. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial environments. |
| Internal oscillator | Yes (on-chip oscillator) | Yes (on-chip oscillator) | An internal oscillator simplifies design by eliminating an external clock source; both provide this. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1232IPW | ADS1222IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 80 | 240 |
| Number of Inputs | 2 | 2 |
| Input Type | Differential, Single Ended | Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | MUX-PGA-ADC | MUX-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External | External |
| Voltage - Supply, Analog | 2.7V ~ 5.3V | 2.7V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 5.3V | 2.7V ~ 5.5V |
| Features | PGA | Temperature Sensor |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS1232IPW and ADS1222IPWRG4?
The ADS1232IPW is a 24-bit, 2-channel delta-sigma ADC with an integrated low-noise PGA, designed primarily for weigh-scale and bridge-sensor applications. The ADS1222IPWRG4 is a 24-bit, 2-channel delta-sigma ADC with a fixed-gain input buffer and a different digital filter architecture. They are not pin-compatible or functionally interchangeable.
Do the ADS1232IPW and ADS1222IPWRG4 have the same package and pinout?
No. The ADS1232IPW is supplied in a 24-pin TSSOP (PW) package, while the ADS1222IPWRG4 is supplied in a 20-pin TSSOP (PW) package. The pin counts and pin functions differ, so PCB layouts are not interchangeable.
What are the maximum output data rates of these two ADCs?
The ADS1232IPW supports selectable data rates of 10 SPS and 80 SPS. The ADS1222IPWRG4 supports a maximum data rate of 100 SPS. The lower rates of the ADS1232IPW are intended for low-noise precision measurement, while the ADS1222IPWRG4 offers a higher maximum throughput.
How do the input configurations differ between the ADS1232IPW and ADS1222IPWRG4?
The ADS1232IPW provides two differential input channels with an integrated PGA offering gains of 1, 2, 64, and 128. The ADS1222IPWRG4 provides two differential input channels with a fixed gain of 1 or 2 via an input buffer, without a programmable PGA. This makes the ADS1232IPW better suited to low-level bridge signals requiring high gain.
Are the supply voltage requirements the same for both devices?
Both devices operate from a single analog supply in the 2.7 V to 5.5 V range. However, the ADS1232IPW also requires a separate digital supply (DVDD) in the 2.7 V to 5.5 V range, while the ADS1222IPWRG4 uses a single supply for both analog and digital domains. Designers should verify the exact supply scheme in the respective datasheets.
Can the ADS1222IPWRG4 be used as a drop-in replacement for the ADS1232IPW?
No. The two devices differ in package pin count (20 vs 24 pins), pinout, gain architecture, and maximum data rate. A direct drop-in replacement is not possible; any substitution requires a redesign of the PCB and revalidation of the signal chain against the target application requirements.
Which device is more suitable for precision weigh-scale applications?
The ADS1232IPW is specifically designed for weigh-scale and strain-gauge applications, featuring a low-noise PGA with gains up to 128 and 10 SPS/80 SPS data rates optimized for precision bridge measurements. The ADS1222IPWRG4, with fixed gain and a 100 SPS maximum rate, is better suited to general-purpose sensor digitization rather than high-resolution weigh-scale designs.