Part A
ADS1231IDR
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 4314 PCS
- Package
- SOIC-16
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1231IDR and ADS1201UG4 are not drop-in replacements for one another. The ADS1231IDR is a 24-bit low-noise ADC with an integrated low-noise PGA and on-chip oscillator, while the ADS1201UG4 is a 24-bit delta-sigma modulator with a differential input and external clock requirement. They differ in output interface, input architecture, clocking scheme, and package footprint, so direct substitution is not feasible without a full board-level redesign.
Different output interface
Different input architecture
Different clocking scheme
Different package footprint
Parts at a glance
Part B
ADS1201UG4
Texas Dụng cụ
- Lifecycle
- Active
- Stock
- 6830 PCS
- Package
- SOIC-16
- Series
- Data Acquisition - ADCs-DACs - Special Purpose
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS1231IDR | ADS1201UG4 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit converters, so resolution alone does not differentiate them for substitutability. |
| Architecture | Delta-Sigma (with integrated PGA and oscillator) | Delta-Sigma modulator | The ADS1231 integrates a PGA and oscillator for a complete weigh-scale front end, while the ADS1201 is a modulator-only device requiring external signal conditioning and clocking. |
| Input type | Differential | Differential | Both accept differential inputs, which is important for rejecting common-mode noise in sensor applications. |
| Output interface | Serial (SPI-compatible, 2-wire) | Serial bit-stream (modulator output) | The ADS1231 outputs converted digital codes directly, whereas the ADS1201 outputs a 1-bit modulator stream that requires an external digital filter, affecting system design and firmware. |
| Supply voltage | 2.7 V to 5.3 V | 4.5 V to 5.5 V | The wider supply range of the ADS1231 allows operation from lower-voltage rails, while the ADS1201 requires a nominal 5 V supply. |
| Data rate / output word rate | 10 SPS or 80 SPS (selectable) | Up to 40 kSPS (modulator clock dependent) | The ADS1231 targets slow, high-resolution measurements, while the ADS1201 supports much higher sampling rates for faster dynamic signals. |
| Integrated PGA | Yes (gain 1 or 128) | No | The built-in PGA in the ADS1231 enables direct connection of low-level bridge sensors, whereas the ADS1201 needs external amplification. |
| Package | SOIC-16 | SOIC-16 | Matching package footprints simplify board-level replacement, though pin functions differ. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Identical temperature ratings mean both suit the same industrial environments. |
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 | ADS1231IDR | ADS1201UG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Type | - | Modulator |
| Number of Channels | - | 1 |
| Resolution(Bits) | - | 24 b |
| Sampling Rate(Per Second) | 80 | 1k |
| Data Interface | SPI | Serial |
| Voltage Supply Source | - | Analog and Digital |
| Voltage - Supply | - | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | - | Surface Mount |
| Number of Bits | 24 | - |
| Number of Inputs | 1 | - |
| Input Type | Differential | - |
| Configuration | ADC | - |
| Number of A/D Converters | 1 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | External | - |
| Voltage - Supply, Analog | 3V ~ 5.3V | - |
| Voltage - Supply, Digital | 3V ~ 5.3V | - |
Frequently asked questions
What are the primary functional differences between the ADS1231IDR and ADS1201UG4?
The ADS1231IDR is a 24-bit delta-sigma analog-to-digital converter optimized for bridge sensor applications, integrating a low-noise PGA and internal oscillator in an 8-pin SOIC package. The ADS1201UG4 is a 24-bit delta-sigma modulator that outputs a 1-bit serial bitstream for isolated signal conditioning, housed in a 16-pin SOIC package. The ADS1231IDR provides a complete ADC solution with digital filter and serial interface, while the ADS1201UG4 requires an external digital filter and clock source.
Are the ADS1231IDR and ADS1201UG4 pin-compatible or package-compatible?
No. The ADS1231IDR is supplied in an 8-pin SOIC (D) package, whereas the ADS1201UG4 is supplied in a 16-pin SOIC (DW) package. The pin counts, pin functions, and PCB land patterns differ, so they are not drop-in replacements for each other.
Can the ADS1231IDR and ADS1201UG4 operate from the same supply voltage?
The ADS1231IDR operates from a single analog supply of 2.7 V to 5.3 V. The ADS1201UG4 operates from a 5 V analog supply (AVDD = 5 V) with a separate digital supply (DVDD) of 2.7 V to 5.5 V. While both can operate with a 5 V analog rail, the ADS1231IDR supports lower analog supply voltages down to 2.7 V, which the ADS1201UG4 does not.
How do the output interfaces of the ADS1231IDR and ADS1201UG4 differ?
The ADS1231IDR provides a two-wire serial interface (SCLK and DOUT/DRDY) that outputs fully filtered 24-bit conversion results directly. The ADS1201UG4 outputs a 1-bit delta-sigma modulated bitstream that must be processed by an external digital filter, such as an FPGA or DSP, to obtain a 24-bit result. This makes the ADS1231IDR suitable for standalone ADC designs, while the ADS1201UG4 is intended for isolated or high-speed modulator applications.
Do both devices include an internal oscillator or clock source?
The ADS1231IDR includes an internal oscillator, eliminating the need for an external clock in most applications. The ADS1201UG4 requires an external clock input (CLKIN) to operate; it does not include an internal oscillator. This is a critical difference when considering system-level component count and design complexity.
What are the typical noise and resolution specifications for each device?
The ADS1231IDR achieves 24-bit resolution with low noise performance optimized for bridge sensors, with datasheet RMS noise specifications typically in the range of tens of nanovolts to microvolts depending on gain and data rate settings. The ADS1201UG4 provides 24-bit resolution as a modulator, with its effective resolution determined by the external digital filter and clock frequency. Designers should consult the respective manufacturer datasheets for exact noise tables under specific operating conditions.
Which device is more suitable for isolated signal conditioning applications?
The ADS1201UG4 is specifically designed for isolated signal conditioning because its 1-bit modulator output can be transmitted across an isolation barrier using a digital isolator, with filtering performed on the isolated or non-isolated side. The ADS1231IDR, with its integrated digital filter and two-wire interface, is better suited for non-isolated bridge sensor applications where a complete ADC solution is desired.
Are the ADS1231IDR and ADS1201UG4 interchangeable in an existing design?
No. Due to differences in package pinout, supply voltage requirements, clock architecture, and output interface, the two devices are not interchangeable without a complete redesign of the PCB, power supply, and digital interface. The ADS1231IDR provides a complete ADC with filtered output, while the ADS1201UG4 requires external clocking and digital filtering, so substitution requires validation against the specific system architecture.