Part A
ADS1232IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 7294 PCS
- Package
- TSSOP-24
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1232IPW and ADS1203IPWRG4 are not drop-in replacements for one another. The ADS1232IPW is a dual-channel 24-bit delta-sigma ADC with an integrated low-noise PGA and on-chip oscillator, while the ADS1203IPWRG4 is a single-channel 16-bit isolated delta-sigma modulator with a digital output interface. They differ in resolution, channel count, output interface, and package, so the ADS1203IPWRG4 cannot be substituted directly for the ADS1232IPW without a full system redesign.
Different resolution
Different channel count
Different output interface
Different package
Parts at a glance
Part B
ADS1203IPWRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4572 PCS
- Package
- TSSOP-8
- Series
- Acquisition de données - ADC DAC - dédié
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 | ADS1203IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Resolution determines the smallest signal change the ADC can distinguish; a 24-bit delta-sigma converter offers far finer resolution than a 16-bit device, affecting measurement precision. |
| Architecture | Delta-Sigma (low-speed, high-resolution) | Delta-Sigma modulator (current-shunt, isolated) | The architecture defines the intended application; the ADS1232 is a complete low-speed measurement ADC, while the ADS1203 is a modulator intended for isolated current sensing with external digital filtering. |
| Input Type | Differential (2 differential channels) | Differential (single channel) | Number and type of input channels determine how many signals can be measured and whether common-mode noise can be rejected; the ADS1232 supports two differential inputs versus one for the ADS1203. |
| Output Interface | SPI-compatible serial (digital output) | 1-bit sigma-delta bitstream | The output format dictates the downstream processing; the ADS1232 delivers finished digital codes over SPI, whereas the ADS1203 outputs a raw modulator bitstream requiring an external digital filter (e.g., sinc filter). |
| Data Rate / Output Word Rate | 10 SPS or 80 SPS (selectable) | Up to 40 kSPS (modulator clock dependent) | Data rate sets the trade-off between speed and noise; the ADS1232 targets slow, high-precision weigh-scale signals, while the ADS1203 supports much higher sampling for dynamic current measurement. |
| Supply Voltage | 2.7 V to 5.3 V (analog and digital) | 4.5 V to 5.5 V | Supply range affects compatibility with the system rail; the ADS1232 operates down to 2.7 V, while the ADS1203 requires a nominal 5 V supply. |
| Package | TSSOP-24 | TSSOP-8 | Package footprint and pin count affect PCB layout and board space; the 24-pin ADS1232 integrates more functions than the 8-pin ADS1203 modulator. |
| Integrated PGA / Gain Stage | Yes (gain 1, 2, 64, 128) | No (external gain/conditioning required) | An on-chip PGA allows direct connection of low-level sensors such as load cells; the ADS1203 lacks this, requiring external amplification for small signals. |
| Typical Application | Weigh scales, strain gauges, pressure sensors | Isolated current-shunt / motor control sensing | Intended application indicates functional substitutability; the two parts serve different measurement domains and are generally not drop-in replacements for one another. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1232IPW | ADS1203IPWRG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Type | - | Modulator |
| Number of Channels | - | 1 |
| Resolution(Bits) | - | 16 b |
| Sampling Rate(Per Second) | 80 | 40k |
| Data Interface | SPI | Serial |
| Voltage Supply Source | - | Single Supply |
| Voltage - Supply | - | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 125°C |
| Mounting Type | - | Surface Mount |
| Number of Bits | 24 | - |
| Number of Inputs | 2 | - |
| Input Type | Differential, Single Ended | - |
| Configuration | MUX-PGA-ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 2.7V ~ 5.3V | - |
| Voltage - Supply, Digital | 2.7V ~ 5.3V | - |
| Features | PGA | - |
Frequently asked questions
What are the primary functional differences between the ADS1232IPW and ADS1203IPWRG4?
The ADS1232IPW is a 24-bit, low-noise, dual-channel delta-sigma ADC designed for bridge sensor applications, integrating a PGA and offering data rates up to 80 SPS. The ADS1203IPWRG4 is a 16-bit, single-channel delta-sigma modulator that outputs a digital bitstream for isolated or FPGA-based signal processing, with a clock frequency up to 10 MHz. They serve different signal-chain architectures and are not functionally interchangeable.
Do the ADS1232IPW and ADS1203IPWRG4 have compatible package and pinout configurations?
No. The ADS1232IPW is supplied in a 24-pin TSSOP (PW) package, while the ADS1203IPWRG4 is supplied in a 16-pin TSSOP (PW) package. The pin counts and pin functions differ, so they cannot be dropped into the same PCB land pattern without redesign.
What are the resolution and output format differences between these two devices?
The ADS1232IPW provides a 24-bit parallel digital output word via a serial interface, suitable for direct numeric conversion of low-level sensor signals. The ADS1203IPWRG4 is a 16-bit delta-sigma modulator that outputs a 1-bit serial bitstream, which must be digitally filtered (e.g., by an FPGA or DSP) to reconstruct the 16-bit result. The output formats are fundamentally different.
Can the ADS1203IPWRG4 be used as a direct replacement for the ADS1232IPW in a weigh-scale design?
No. The ADS1232IPW integrates a low-noise PGA and a complete ADC with on-chip digital filter, specifically targeting weigh-scale and bridge-sensor designs. The ADS1203IPWRG4 lacks an integrated PGA and requires external digital filtering and a modulator clock, so it cannot directly replace the ADS1232IPW without significant system redesign.
How do the supply voltage and power consumption specifications compare?
The ADS1232IPW operates from a single 5 V analog supply (with a 2.7 V to 5.25 V digital supply) and typically consumes about 5 mW in normal operation. The ADS1203IPWRG4 operates from a 5 V analog supply and a 3 V to 5.5 V digital supply, with power consumption dependent on the modulator clock frequency. Exact power figures should be verified against the respective manufacturer datasheets for the target operating conditions.
What are the typical application areas for each device?
The ADS1232IPW is typically used in weigh scales, strain-gauge bridge sensors, pressure sensors, and industrial process control where a complete low-noise ADC with PGA is required. The ADS1203IPWRG4 is typically used in motor control, isolated current sensing, power measurement, and FPGA-based data acquisition where a delta-sigma bitstream is processed digitally.
Are the operating temperature ranges of the ADS1232IPW and ADS1203IPWRG4 the same?
Both devices are specified for the industrial temperature range of -40°C to +85°C, as indicated by their respective manufacturer datasheets. Designers should still confirm the exact grade and temperature specification for the specific orderable part number.