Part A
ADS131M08IPBS
Texas Instruments
- Lifecycle
- Active
- Stock
- 6440 Stückzahl
- Package
- TQFP-32
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS131M08IPBS is a viable functional replacement candidate for the ADS131A04IPBSR in many multi-channel simultaneous-sampling ADC applications, but it is not a drop-in substitute. Designers must account for the higher channel count, different package footprint, and differing digital interface and supply requirements before qualifying the ADS131M08IPBS in an existing ADS131A04IPBSR socket.
Channel Count
Validation required
Package Type
Validation required
Digital Interface
Validation required
Resolution
High match
Parts at a glance
Part B
ADS131A04IPBSR
Texas Instruments
- Lifecycle
- Active
- Stock
- 3693 Stückzahl
- Package
- TQFP-32
- Series
- Datenerfassung mit dem Analog Front End (AFE)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS131A04IPBSR | ADS131M08IPBS | Why it matters |
|---|---|---|---|
| Number of ADC channels | 4 | 8 | Channel count determines how many independent analog signals can be measured simultaneously; a direct functional substitutability constraint. |
| Resolution | 24 bit | 24 bit | Both provide 24-bit delta-sigma conversion, so precision class is equivalent for high-accuracy measurement applications. |
| Maximum sample rate (per channel) | 128 kSPS | 32 kSPS | Sample rate limits the bandwidth of signals that can be captured; the higher-rate device suits faster dynamic measurements. |
| Interface type | SPI (with hardware/async modes) | SPI | Both use SPI, but differing protocol modes affect firmware and host-controller compatibility during substitution. |
| Supply voltage (analog) | 3.0 V to 3.6 V (AVDD) | 2.7 V to 3.6 V (AVDD) | Analog supply range affects compatibility with the system power rail and low-voltage operation margin. |
| Package | 32-pin TQFP (PBS) | 32-pin TQFP (PBS) | Identical package and pin count simplify PCB footprint reuse, though pinout must still be verified. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +125 °C | Matching industrial temperature range ensures equivalent environmental robustness for the target application. |
| Internal reference | Integrated 2.442 V reference | Integrated 1.2 V reference | Reference voltage sets the full-scale input range and affects gain/calibration; differing values require recalibration on substitution. |
| Data output format | Two's complement, 24-bit words | Two's complement, 24-bit words | Consistent output coding eases host-side data parsing when swapping devices. |
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 | ADS131M08IPBS | ADS131A04IPBSR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 32k | - |
| Number of Inputs | 8 | - |
| Input Type | Differential | - |
| Data Interface | SPI | - |
| Configuration | ADC | - |
| Ratio - S / H: ADC | 0:1 | - |
| Number of A/D Converters | 8 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | Internal | - |
| Voltage - Supply, Analog | 2.7V ~ 3.6V | 3V ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | 1.65V ~ 3.6V |
| Features | PGA, Simultaneous Sampling | - |
| Operating Temperature | -40°C ~ 125°C | - |
| Number of Channels | - | 4 |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the key architectural differences between the ADS131A04IPBSR and the ADS131M08IPBS?
The ADS131A04IPBSR is a 4-channel, simultaneous-sampling, 24-bit delta-sigma ADC with a maximum data rate of 128 kSPS and an SPI-compatible interface. The ADS131M08IPBS is an 8-channel, simultaneous-sampling, 24-bit delta-sigma ADC with a maximum data rate of 32 kSPS and an SPI-compatible interface. The ADS131A04IPBSR includes a hardware-based SPI interface with a dedicated DRDY pin and supports both synchronous and asynchronous master clock modes, while the ADS131M08IPBS integrates a more flexible digital filter and a wider gain range per channel.
Are the ADS131A04IPBSR and ADS131M08IPBS pin-to-pin compatible?
No. The ADS131A04IPBSR is offered in a 32-pin TQFP package (PBS), while the ADS131M08IPBS is offered in a 32-pin TQFP package (PBS) as well, but the pin functions and assignments differ between the two devices. They are not direct drop-in replacements and require separate PCB layouts and firmware configurations.
Which device offers a higher number of input channels?
The ADS131M08IPBS provides 8 simultaneous-sampling input channels, whereas the ADS131A04IPBSR provides 4 simultaneous-sampling input channels. The ADS131M08IPBS is therefore better suited for applications requiring more sensor inputs in a single device.
How do the maximum data rates compare between the two ADCs?
The ADS131A04IPBSR supports a maximum data rate of 128 kSPS per channel, while the ADS131M08IPBS supports a maximum data rate of 32 kSPS per channel. The ADS131A04IPBSR is preferable for higher-bandwidth signal acquisition, while the ADS131M08IPBS targets lower-speed, multi-channel applications.
Do both devices support simultaneous sampling of all channels?
Yes. Both the ADS131A04IPBSR and the ADS131M08IPBS use simultaneous-sampling delta-sigma architectures, meaning all channels in each device sample the input signal at the same instant. This preserves phase relationships between channels, which is important for power metering and multi-phase sensing applications.
What are the typical supply voltage requirements for these devices?
Both the ADS131A04IPBSR and the ADS131M08IPBS operate from an analog supply (AVDD) of 3.0 V to 3.6 V and a digital supply (DVDD) of 1.8 V to 3.6 V, with an additional negative charge pump or bipolar supply option for the analog front end. Designers should confirm exact limits in the respective manufacturer datasheets before finalizing the power tree.
Which device is more suitable for multi-phase power metering applications?
The ADS131M08IPBS is generally more suitable for multi-phase power metering because its 8 simultaneous-sampling channels can accommodate three voltage and three current channels plus neutral and auxiliary inputs in a single device. The ADS131A04IPBSR, with only 4 channels, would require multiple devices or external multiplexing for equivalent multi-phase coverage.
Can the ADS131A04IPBSR and ADS131M08IPBS share the same SPI firmware driver?
No. Although both use an SPI-compatible serial interface, their register maps, command sets, and frame formats differ. Firmware developed for the ADS131A04IPBSR cannot be reused directly on the ADS131M08IPBS without modification to the register configuration, data framing, and initialization sequence.