Part A
ADS1220IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 4062 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS1220IPW and ADS1232IPWRG4 are both 24-bit delta-sigma ADCs from Texas Instruments sharing a common TSSOP-16 footprint and similar supply architecture, but they differ in resolution, data rate, input channel configuration, and interface flexibility. The ADS1220IPW offers higher programmable gain, faster maximum data rates, and a flexible SPI interface, while the ADS1232IPWRG4 provides a fixed two-channel differential input with a simpler two-wire interface. Designers should validate channel count, data rate, and interface requirements against the target application before substituting one for the other.
Resolution and Data Rate
Validation required
Input Channel Configuration
Validation required
Package Type
High match
Digital Interface
Validation required
Parts at a glance
Part B
ADS1232IPWRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4376 PCS
- Package
- TSSOP-24
- 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 | ADS1220IPW | ADS1232IPWRG4 | 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 | 4 (2 differential / 4 single-ended) | 2 differential | Channel count determines how many sensors or signal pairs can be connected; the ADS1220 offers more flexible input configurations. |
| Input type / PGA | Flexible MUX with integrated PGA (gain 1 to 128) | Fixed 2-channel with PGA (gain 1 to 128) | A programmable gain amplifier allows direct connection of low-level sensors; the input architecture affects sensor compatibility. |
| Data rate (SPS) | Up to 2000 SPS | 10 or 80 SPS | Maximum sample rate affects achievable measurement bandwidth and noise performance; the ADS1220 supports much faster sampling. |
| Interface | SPI | SPI | Both use SPI, so the host microcontroller interface is compatible between the two parts. |
| Supply voltage (analog) | 2.3 V to 5.5 V | 2.7 V to 5.3 V | Supply range determines compatibility with the system power rail; the ADS1220 supports a slightly wider and lower minimum voltage. |
| Package | TSSOP-16 | TSSOP-24 | Package footprint and pin count affect PCB layout and drop-in substitutability; these parts are not pin-compatible. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +105 °C | The temperature range affects suitability for harsh environments; the ADS1220 offers a higher upper limit. |
| Internal oscillator | Yes (internal oscillator) | Yes (internal oscillator) | An internal oscillator simplifies design by removing the need for an external clock source in both parts. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1220IPW | ADS1232IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 2k | 80 |
| Number of Inputs | 2, 4 | 2 |
| 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, Supply | External |
| Voltage - Supply, Analog | 2.3V ~ 5.5V, ±2.5 | 2.7V ~ 5.3V |
| Voltage - Supply, Digital | 2.3V ~ 5.5V | 2.7V ~ 5.3V |
| Features | PGA, Temperature Sensor | PGA |
| Operating Temperature | -40°C ~ 125°C | -40°C ~ 105°C |
Frequently asked questions
What are the primary differences between the ADS1220IPW and ADS1232IPWRG4?
The ADS1220IPW is a 24-bit, 4-channel, 2-kSPS delta-sigma ADC with a programmable gain amplifier, SPI interface, and internal 2.048-V reference, housed in a 16-pin TSSOP. The ADS1232IPWRG4 is a 24-bit, 2-channel, 80-SPS delta-sigma ADC with a fixed gain of 128, an onboard oscillator, and a 24-bit dual-channel architecture, supplied in a 24-pin TSSOP. The ADS1220 offers higher sample rate and channel count with flexible PGA settings, while the ADS1232 targets low-speed, high-resolution weigh-scale applications.
Are the ADS1220IPW and ADS1232IPWRG4 pin-compatible?
No. The ADS1220IPW uses a 16-pin TSSOP package, while the ADS1232IPWRG4 uses a 24-pin TSSOP package. Pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
What are the maximum sample rates of the ADS1220IPW and ADS1232IPWRG4?
The ADS1220IPW supports data rates up to 2 kSPS in normal mode (and up to 2 kSPS with the internal oscillator). The ADS1232IPWRG4 provides a fixed 80-SPS output rate (10 SPS or 80 SPS selectable via the SPEED pin).
How do the input channel configurations compare between the two devices?
The ADS1220IPW provides four single-ended or two differential input channels, configurable through its input multiplexer. The ADS1232IPWRG4 provides two differential input channels (AIN1 and AIN2) intended for bridge sensor applications.
Do both devices include an internal reference and oscillator?
The ADS1220IPW includes an internal 2.048-V reference and an internal oscillator, and also supports external reference and clock sources. The ADS1232IPWRG4 includes an onboard oscillator and an internal reference, with the reference value dependent on the configuration (typically 2.5 V for the ADS1232). External reference options are also supported.
What gain settings are available on the ADS1220IPW versus the ADS1232IPWRG4?
The ADS1220IPW features a programmable gain amplifier with selectable gains of 1, 2, 4, 8, 16, 32, 64, and 128. The ADS1232IPWRG4 uses a fixed gain of 128 for its low-level differential inputs, optimized for direct bridge-sensor interfacing.
Which device is better suited for weigh-scale and bridge-sensor applications?
The ADS1232IPWRG4 is specifically designed for weigh-scale and bridge-sensor applications, offering a fixed gain of 128, 80-SPS output, and an onboard oscillator that simplifies system design. The ADS1220IPW is more flexible with programmable gain and higher sample rates, making it suitable for a broader range of sensor and measurement applications, including weigh scales where higher speed or additional channels are needed.
What are the supply voltage requirements for the ADS1220IPW and ADS1232IPWRG4?
The ADS1220IPW operates from an analog supply (AVDD) of 2.3 V to 5.5 V and a digital supply (DVDD) of 2.3 V to 5.5 V. The ADS1232IPWRG4 operates from a single supply of 2.7 V to 5.3 V (AVDD) with a digital supply (DVDD) of 2.7 V to 5.3 V. Both are suitable for low-voltage, mixed-signal systems.