ADS131M08IPBS - 8-Ch 24-Bit 32kSPS Delta-Sigma ADC | TI
MPN: ADS131M08IPBS ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.95 | $5.95 |
| 10 | $5.36 | $53.60 |
| 100 | $4.72 | $472.00 |
| 500 | $4.28 | $2,140.00 |
| 1,000 | $3.85 | $3,850.00 |
ADS131M08IPBS Overview
A delta-sigma ADC oversamples the analog input and applies digital decimation filtering to reach very high resolution, which makes this converter family the dominant architecture for precision power and metrology sensing. Within the signal-chain hierarchy, the ADS131M08 sits between front-end conditioning (resistor dividers or current transformers, which its inputs can directly interface to) and a host MCU communicating over its serial interface.
Key features include eight simultaneously sampling differential inputs, a programmable output data rate up to 32 kSPS, and a programmable gain amplifier with settings up to 128. Noise performance is 102-dB dynamic range at gain = 1 (4 kSPS) and 80-dB dynamic range at gain = 64 (4 kSPS), enabling direct connection to shunt resistors and current transformers without external amplification in many designs. Energy-measurement-specific features reduce external component count in metering front ends.
The architecture uses a delta-sigma modulator per channel with digital filter and decimation stages, plus a serial interface with CRC options for robust communication. Because all eight channels sample at the same instant, phase relationships across channels are preserved - critical for three-phase power calculations. An automotive variant, the ADS131M08QPBSRQ1, is AEC-Q100 qualified for temperature grade 1 and functional-safety-capable with supporting documentation.
Typical applications include three-phase energy meters, protective relays and circuit breakers, solar inverter and power metrology systems, and motor drive current/voltage sensing. In a bidirectional interleaved buck converter reference design, TI pairs the ADS131M08 with a C2000 MCU for precise power-stage control.
Design tip: because all channels sample simultaneously, external network tolerances (divider ratio, shunt value) dominate inter-channel accuracy - budget external precision accordingly rather than relying on ADC matching alone.
This page synthesizes distributor pricing, drop-in same-family alternatives, comparison tables, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ADS131M08IPBS — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADS131M08IPBS (same form factor and footprint) — differing in Number of Channels, Package, Interface, Sampling Rate, Application Focus.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADS131M08QPBSRQ1
✅ Drop-In✓ In Stock
Contact for price
View Datasheet →ADS131M08IPBSR
✅ Drop-In✓ In Stock
$6.6 / Unit
View Datasheet →ADS131M06IPBS
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADS131M04IPBS
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADS131M08IPBS Maximum Ratings & Electrical Characteristics
| Resolution | 24 bit |
| Number of Channels | 8 |
| Number of Inputs | 8 differential |
| Sampling Rate | Up to 32 kSPS |
| Architecture | Delta-Sigma (ΔΣ) |
| Sampling Scheme | Simultaneous |
| Programmable Gain | Up to 128 |
| Dynamic Range (gain = 1, 4 kSPS) | 102 dB |
| Dynamic Range (gain = 64, 4 kSPS) | 80 dB |
| Input Type | Differential (directly interfaces to resistor-divider or CT) |
| Interface | Serial (SPI-compatible, CRC option) |
| Package | 32-TQFP (5x5 mm) |
| Mounting Type | Surface Mount |
| Packaging | Tray |
| Typical Applications | Energy metering, power metrology, circuit breakers |
ADS131M08IPBS 32-tqfp (5x5 mm) Pin Configuration Guide
Pin configuration for ADS131M08IPBS (32-tqfp (5x5 mm) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for ADS131M08IPBS.
Refer to the datasheet for full pin configuration.
Typical Applications
ADS131M08IPBS is suitable for 6 applications: Three-Phase Energy Metering, Protective Relays and Circuit Breakers, Solar Inverter Power Metrology, Motor Drive Current and Voltage Sensing, Bidirectional DC-DC Converter Control, Power Quality Monitoring and Submetering.
Three-Phase Energy Metering
The ADS131M08IPBS was designed for this application: its eight simultaneous-sampling differential inputs capture three phase voltages, three phase currents, and neutral channels with zero inter-channel skew, which is mandatory for correct active/reactive power and energy calculations under distorted waveforms. The 102-dB dynamic range at gain = 1 (4 kSPS) supports wide-range metering across the full current range of a class-precision meter, while programmable gain up to 128 lets one front end serve both direct-connected and transformer-connected meters. Inputs connect directly to resistor dividers and CTs, and energy-measurement-specific features per the TI datasheet reduce external component count. The trade-off is that external divider and shunt/CT tolerances, not the ADC, set final metering accuracy - budget precision components accordingly.
Recommended
Protective Relays and Circuit Breakers
Protective relaying requires coherent multi-channel measurement of phase and ground currents and voltages to compute symmetrical components and trip decisions; the ADS131M08IPBS's simultaneous sampling eliminates the phase error that time-interleaved multiplexed ADCs would introduce. Its 80-dB dynamic range at gain = 64 (4 kSPS) resolves small fault signatures on top of large load currents, and the serial interface with CRC option protects measurement integrity in electrically noisy switchgear environments. Inputs interfacing directly to CT secondaries remove intermediate gain stages, improving reliability. For harsh substation temperature ranges, the AEC-Q100 qualified ADS131M08QPBSRQ1 drop-in variant provides extended qualification coverage on the same footprint.
Recommended
Solar Inverter Power Metrology
Grid-tied solar inverters must measure PV input, DC bus, and three-phase AC output simultaneously for MPPT control, anti-islanding detection, and revenue-grade net metering. The ADS131M08IPBS provides eight differential simultaneous channels in one device, so DC and AC quantities are sampled at the same instant - avoiding phase-alignment software compensation. The 102-dB dynamic range at gain = 1 (4 kSPS) captures both small nighttime standby consumption and full-power generation on the same gain setting, and direct resistor-divider interfacing suits high-voltage bus sensing through appropriate dividers. The 32-kSPS maximum data rate is ample for 50/60 Hz grid harmonic monitoring up to moderate harmonic orders.
Recommended
Motor Drive Current and Voltage Sensing
Precision motor drives use shunt-based phase current measurement for field-oriented control torque accuracy; the ADS131M08IPBS's simultaneous sampling of multiple shunt channels removes skew between phase current measurements that would otherwise cause torque ripple in FOC algorithms. With gain up to 128 and 80-dB dynamic range at gain = 64 (4 kSPS), small shunt voltages are resolved directly without external amplifiers, and the 32-kSPS data rate supports control loop bandwidths typical of servo drives. TI's bidirectional interleaved buck converter reference design demonstrates pairing the ADS131M08 with a C2000 MCU for precise power-stage control - a topology directly analogous to drive phase-current acquisition. Observe shunt power dissipation and common-mode limits in divider networks.
Recommended
Bidirectional DC-DC Converter Control
In TI's reference design for a bidirectional interleaved buck converter, the ADS131M08 precisely measures inductor currents and bus voltages for a C2000 MCU closing the control loop. The ADS131M08IPBS brings the same capability: simultaneous sampling of interleaved phase currents is essential because current-sharing imbalance between interleaved legs causes thermal stress, and skew-free acquisition lets the controller balance legs accurately. The 24-bit resolution allows small shunt values, cutting shunt dissipation at high current, while programmable gain (to 128) restores signal amplitude. Designers should match the ADC's 32-kSPS maximum data rate and filter latency to the control loop bandwidth when budgeting phase margin.
Recommended
Power Quality Monitoring and Submetering
Power-quality analyzers and submeters need simultaneous multi-channel acquisition to compute harmonics, unbalance, and flicker correctly; the ADS131M08IPBS's eight coherent channels cover a full three-phase-plus-neutral set in one IC, and the 32-kSPS maximum output rate permits harmonic analysis up to roughly the 250th order of a 60 Hz fundamental in principle, with practical bandwidth set by the digital filter response. The 102-dB dynamic range (gain = 1, 4 kSPS) lets one front end measure both light-load standby draw and fault-level surges, and the low per-channel power supports dense multi-circuit submeter panels. Use anti-alias filtering ahead of the differential inputs since delta-sigma modulators still require input bandwidth limiting.
Recommended
Recommended Products Summary
Engineering reference data for ADS131M08IPBS — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS131M08QPBSRQ1 | ADS131M08IPBSR | ADS131M06IPBS | ADS131M04IPBS |
|---|---|---|---|---|---|
| Package | 32-TQFP (5x5 mm) | 32-TQFP (5x5 mm) - same | 32-TQFP (5x5 mm) - same | 32-TQFP (5x5 mm) - same | 32-TQFP (5x5 mm) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 24 bit | 24 bit | 24 bit | 24 bit | 24 bit |
| Channels | 8 | 8 | 8 | 6 | 4 |
| Max Data Rate | 32 kSPS | 32 kSPS | 32 kSPS | 32 kSPS | 32 kSPS |
| Dynamic Range (gain = 1, 4 kSPS) | 102 dB | 102 dB | 102 dB | 102 dB | 102 dB |
| Programmable Gain | Up to 128 | Up to 128 | Up to 128 | Up to 128 | Up to 128 |
| Qualification | Standard industrial | AEC-Q100 Grade 1 | Standard industrial | Standard industrial | Standard industrial |
Key Differentiators
- Eight simultaneous channels in one device (vs ADS131M04IPBS)
- Automotive drop-in upgrade path (vs ADS131M08QPBSRQ1)
- Metering-optimized feature set (vs ADS131E08)
Design Notes
Because all eight channels sample simultaneously, inter-channel accuracy is dominated by the external network, not the ADC: resistor-divider ratio tolerance and CT/shunt phase error directly bias power calculations. Use 0.1% or better divider resistors for voltage sensing and specify CT burden compensation or phase-compensation calibration in firmware. A 5% divider error maps directly to a 5% energy error regardless of the 24-bit ADC resolution.
Place anti-alias RC filtering directly at each differential input pair; although the delta-sigma digital filter attenuates out-of-band noise, the modulator front end still folds high-frequency energy into band. Keep the analog ground return for input networks separate from the digital serial-interface return, and join them at a single point under the ADC. Route the serial clock away from input traces to prevent clock coupling appearing as inter-channel crosstalk.
Data-rate and gain settings trade noise for bandwidth: 102-dB dynamic range applies at gain = 1 and 4 kSPS, while gain = 64 at the same rate yields 80 dB - do not assume full dynamic range is available at maximum gain and 32 kSPS. Also use the interface CRC option in noisy environments such as switchgear and drives, and verify reference configuration against the datasheet since reference errors affect all eight channels identically.
The ADS131M08 family is specified as low power for metering front ends; check the datasheet supply current tables at your selected data rate and gain, and estimate (Estimated) total front-end budget including reference and external dividers before finalizing the power tree. For battery- or shunt-powered submeters, lower data rates reduce average consumption proportionally to modulator clock activity.
Compliance Information
RoHS and lead-free status per distributor listings (DigiKey/Mouser). AEC-Q100 applies to the ADS131M08QPBSRQ1 variant, not this standard-grade part. Verify REACH and halogen status on TI.com product page.
