Part A
ADS1231IDR
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 4314 PCS
- Package
- SOIC-16
- Series
- 데이터 수집 - 아날로그 변환기(ADC)
Replacement verdict
Not a drop-in replacement
The ADS1231IDR and ADS1201U/1K are not drop-in replacements for one another. Although both are single-channel delta-sigma analog-to-digital converters, they differ fundamentally in resolution, output interface, package footprint, and target application, so substituting one for the other requires full electrical and mechanical redesign validation.
Different resolution
Different output interface
Different package footprint
Different input architecture
Parts at a glance
Part B
ADS1201U/1K
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 9427 PCS
- Package
- SOIC-16
- Series
- 데이터 수집 - ADC DAC- 전용
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 | ADS1201U/1K | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 24 | Both are 24-bit, so resolution alone does not differentiate them for substitutability. |
| Architecture | Delta-sigma (with integrated PGA and oscillator) | Delta-sigma modulator | The ADS1231 is a complete ADC with built-in gain stage and clock, while the ADS1201 is a modulator requiring external digital filtering, affecting drop-in compatibility. |
| Output Interface | Serial (SPI-compatible, 2-wire) | Serial bit-stream modulator output | Different output formats mean the host must use different digital processing; the ADS1201 needs an external sinc filter. |
| Input Type | Differential, low-level bridge/sensor input with PGA | Differential analog input | The ADS1231 integrates a PGA suited to direct sensor connection, whereas the ADS1201 requires external signal conditioning. |
| Data Rate / Output Word Rate | 10 SPS or 80 SPS (selectable) | Up to 1.5 kSPS (modulator clock dependent) | The ADS1201 supports much higher throughput, making it suitable for faster or higher-bandwidth applications than the ADS1231. |
| Supply Voltage | 2.7 V to 5.3 V | 5 V (single supply, ±5%) | The wider supply range of the ADS1231 allows lower-voltage operation, while the ADS1201 is restricted to a 5 V supply. |
| Package | SOIC-16 (D) | SOIC-16 (DW) | Both are 16-pin SOIC, but pinout and footprint details differ, so board-level substitution requires layout verification. |
| Integrated Oscillator / Clock | Yes (internal oscillator) | No (external clock required) | The ADS1231 can operate standalone, while the ADS1201 needs an external clock source, adding design complexity. |
| Typical Application | Weigh scales, strain gauges, pressure sensors | Motor control, power measurement, isolated sensing | Their intended use cases differ, so functional substitutability depends on the target application requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1231IDR | ADS1201U/1K |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Active |
| 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 the ADS1201U/1K?
The ADS1231IDR is a complete 24-bit delta-sigma analog-to-digital converter (ADC) with an integrated low-noise programmable gain amplifier (PGA) and an on-chip oscillator, designed primarily for weigh-scale and bridge-sensor applications. The ADS1201U/1K is a 24-bit delta-sigma modulator that outputs a 1-bit serial bitstream and requires an external digital filter (typically an FPGA or DSP) to produce a usable conversion result. In short, the ADS1231IDR is a stand-alone ADC with digital output, while the ADS1201U/1K is a modulator requiring external signal processing.
Do the ADS1231IDR and ADS1201U/1K have compatible package and pinout configurations?
No. The ADS1231IDR is supplied in a 16-pin SOIC (D) package, while the ADS1201U/1K is supplied in a 16-pin SOIC (DW) package. Although both are 16-pin SOIC devices, their pin functions and internal architectures differ, so they are not pin-for-pin drop-in replacements. PCB layout and pin assignments must be verified against the respective manufacturer datasheets before any substitution.
What are the input signal ranges and PGA capabilities of each device?
The ADS1231IDR integrates a low-noise PGA with selectable gains of 1 and 128, allowing direct connection of low-level bridge sensors; its input range depends on the selected gain and the reference voltage. The ADS1201U/1K is a modulator without an integrated PGA, so its input range is determined by the external analog front-end and the reference applied to the device. Designers must account for this difference when comparing effective resolution and noise performance.
How do the output data interfaces of the ADS1231IDR and ADS1201U/1K differ?
The ADS1231IDR provides a two-wire serial interface that outputs fully converted 24-bit data words, simplifying interfacing to a microcontroller. The ADS1201U/1K outputs a 1-bit oversampled serial bitstream (a delta-sigma modulator output) that must be processed by an external digital decimation filter to obtain a 24-bit result. This architectural difference affects system complexity, latency, and the required host processing resources.
Are the ADS1231IDR and ADS1201U/1K suitable for the same applications?
They target different system architectures. The ADS1231IDR is well suited to stand-alone precision measurement such as weigh scales, strain-gauge bridges, and pressure sensors where an integrated PGA and digital output simplify the design. The ADS1201U/1K is intended for systems that already include a digital signal processor or FPGA capable of implementing the required decimation filter, such as motor control, power measurement, and other high-resolution modulation applications. Application suitability must be confirmed against each datasheet's specified operating conditions.
What supply voltage and reference requirements apply to each device?
The ADS1231IDR operates from a single analog supply (typically 5 V) with a separate digital supply, and it uses an external reference for ratiometric bridge measurements. The ADS1201U/1K operates from a 5 V analog supply and a separate digital supply, and it also requires an external reference voltage to define its full-scale input range. Exact supply ranges, reference values, and decoupling requirements must be taken from the official manufacturer datasheets, as these parameters are critical to achieving specified performance.
Can the ADS1231IDR be used as a direct substitute for the ADS1201U/1K in an existing design?
No. Because the ADS1231IDR integrates a PGA and outputs converted digital words over a two-wire interface, while the ADS1201U/1K outputs a 1-bit modulator bitstream requiring an external digital filter, the two devices are not functionally interchangeable. A direct substitution would require redesign of the analog front-end, the digital filter, and the host interface. Any replacement should be validated against the manufacturer datasheets and the target system requirements.