Part A
ADS1230IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2859 PCS
- Package
- TSSOP-16
- Series
- Acquisition de données - Convertisseur analogique - numérique (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1230IPW and ADS1203IPWRG4 are not drop-in replacements for one another. Although both are delta-sigma analog-to-digital converters, they differ fundamentally in resolution, output interface, input architecture, and package footprint, so substituting one for the other requires a full board and firmware redesign rather than a direct swap.
Different output interface
Different resolution
Different input architecture
Different package footprint
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 | ADS1230IPW | ADS1203IPWRG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 20 | 16 | Resolution determines the smallest signal change the ADC can distinguish; a 20-bit device offers finer measurement granularity than a 16-bit device. |
| Architecture | Delta-Sigma (low-speed, high-resolution) | Delta-Sigma modulator (current-shunt, isolated) | The converter architecture dictates the application class; the ADS1230 targets precision weigh-scale sensing while the ADS1203 is a modulator intended for isolated current-shunt measurement. |
| Output Interface | Serial (SPI-compatible, 2-wire) | Serial bit-stream modulator output | Interface compatibility determines whether the part can drop into an existing digital bus; a modulator bit-stream requires an external digital filter/decimator, unlike the ADS1230's direct serial data output. |
| Input Type | Differential (bridge sensor) | Differential (current-shunt) | Input configuration must match the sensor topology; both are differential but are optimized for different source types (bridge vs. shunt). |
| Data Rate / Output Word Rate | 10 SPS or 80 SPS (selectable) | Up to 40 kSPS modulator clock (10 MHz max) | Output rate defines measurement bandwidth and noise trade-off; the ADS1230 is a slow precision converter while the ADS1203 modulator supports much higher sampling for fast current-loop control. |
| Supply Voltage | 2.7 V to 5.3 V | 4.5 V to 5.5 V | Supply range affects system-level compatibility; the ADS1230 tolerates lower supplies, while the ADS1203 requires a nominal 5 V rail. |
| Package | 16-pin TSSOP | 8-pin SOIC (small outline) | Footprint and pin count affect PCB layout and board space; the two parts are not pin-compatible and require different land patterns. |
| Internal PGA / Gain | Fixed gain of 128 (on-chip PGA) | No integrated PGA (external gain stage required) | An integrated PGA simplifies small-signal sensing without external front-end circuitry; the ADS1203 relies on external amplification, changing the surrounding circuit design. |
| Typical Application | Weigh scales, strain gauges, pressure sensors | Motor control, isolated current sensing, power monitoring | Intended application indicates functional substitutability; the parts serve different end uses and are generally not interchangeable in a given design. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1230IPW | 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 ~ 85°C | -40°C ~ 125°C |
| Mounting Type | - | Surface Mount |
| Number of Bits | 20 | - |
| Number of Inputs | 1 | - |
| Input Type | Differential, Single Ended | - |
| Configuration | 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 ADS1230IPW and ADS1203IPWRG4?
The ADS1230IPW is a 20-bit delta-sigma analog-to-digital converter designed primarily for weigh-scale and bridge-sensor applications, integrating a low-noise PGA with gains of 1, 2, 64, and 128. The ADS1203IPWRG4 is a 16-bit second-order delta-sigma modulator that outputs a 1-bit data stream for isolated signal conditioning and current-shunt measurement applications, requiring an external digital filter or FPGA to derive the digital output word.
Do the ADS1230IPW and ADS1203IPWRG4 have compatible package footprints?
No. The ADS1230IPW is supplied in a 16-pin TSSOP (PW) package, while the ADS1203IPWRG4 is supplied in an 8-pin TSSOP (PW) package with a different pin count and pinout. They are not footprint-compatible and cannot be interchanged on the same PCB land pattern without redesign.
What are the supply voltage requirements for each device?
The ADS1230IPW operates from a single analog supply (AVDD) of 2.7 V to 5.3 V and a digital supply (DVDD) of 2.7 V to 5.3 V. The ADS1203IPWRG4 operates from a single 5 V analog supply (AVDD) of 4.5 V to 5.5 V and a digital supply (DVDD) of 2.7 V to 5.5 V, per the respective manufacturer datasheets.
What output data format does each converter provide?
The ADS1230IPW provides a 20-bit two's complement serial output via an SPI-compatible interface with a dedicated DRDY/DOUT line. The ADS1203IPWRG4 provides a 1-bit sigma-delta modulated bitstream on a single MDO line, which must be digitally filtered externally to obtain a 16-bit conversion result.
Can the ADS1203IPWRG4 be used as a drop-in replacement for the ADS1230IPW in a weigh-scale design?
No. The ADS1230IPW integrates a PGA and a complete 20-bit ADC with on-chip digital filtering, while the ADS1203IPWRG4 is a modulator-only device requiring external digital filtering and lacking an integrated PGA. The two devices differ in resolution, interface, package, and signal chain architecture, so direct substitution is not possible.
What are the typical target applications for each device?
The ADS1230IPW is intended for weigh scales, strain-gauge bridge sensors, and low-frequency precision measurement systems. The ADS1203IPWRG4 is intended for isolated current and voltage sensing, motor control feedback, and industrial process control where a modulated bitstream is processed by an external digital filter or controller.
Do both devices support the same operating temperature range?
Yes. Both the ADS1230IPW and ADS1203IPWRG4 are specified for the industrial temperature range of -40°C to +85°C, as stated in their respective manufacturer datasheets.