ADS131M08IPBS - 8-Ch 24-Bit 32kSPS Delta-Sigma ADC | TI
MPN: ADS131M08IPBS β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.12 | $7.12 |
| 10 | $6.45 | $64.50 |
| 100 | $5.6 | $560.00 |
| 500 | $4.95 | $2,475.00 |
| 1,000 | $4.38 | $4,380.00 |
Drop-in alternatives for ADS131M08IPBS β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ADS131M08QPBSRQ1
β Drop-Inπ Reference alternative (not in catalog)
ADS131M06IPBS
β‘ Same Packageπ Reference alternative (not in catalog)
ADS131M04IPBS
β‘ Same Packageπ Reference alternative (not in catalog)
ADS131M08IPBS Maximum Ratings & Electrical Characteristics
| Resolution | 24 bit |
| Number of Channels | 8 differential inputs |
| Sampling Architecture | Simultaneously-sampling delta-sigma (ΞΞ£) |
| Max Data Rate | 32 kSPS (programmable) |
| Dynamic Range (Gain = 1) | 102 dB at 4 kSPS |
| Dynamic Range (Gain = 64) | 80 dB at 4 kSPS |
| Programmable Gain | Up to 128 |
| Internal Reference | Yes, low-drift |
| Interface | SPI-compatible |
| Input Type | Differential, direct resistor-divider or CT interface |
| Operating Temperature | -40C to +125C (Q1 variant, temperature grade 1) |
| Package | 32-TQFP (5x5 mm) |
| Mounting Type | Surface Mount |
| Automotive Qualification | AEC-Q100 (ADS131M08QPBSRQ1 variant) |
| Functional Safety | Functional Safety-Capable (documentation available) |
| Supply Voltage | [DATA_NEEDED: analog supply voltage range] |
| Power Consumption | [DATA_NEEDED: power per channel] |
| RoHS Status | Compliant |
ADS131M08IPBS Pin Configuration
| Pin 1 | AVDD β Analog power supply |
| Pin 2 | AVSS β Analog ground |
| Pin 3 | AINP0 β Channel 0 positive differential input |
| Pin 4 | AINN0 β Channel 0 negative differential input |
| Pin 5 | AINP1 β Channel 1 positive differential input |
| Pin 6 | AINN1 β Channel 1 negative differential input |
| Pin 7 | AINP2 β Channel 2 positive differential input |
| Pin 8 | AINN2 β Channel 2 negative differential input |
| Pin 9 | AINP3 β Channel 3 positive differential input |
| Pin 10 | AINN3 β Channel 3 negative differential input |
| Pin 11 | AINP4 β Channel 4 positive differential input |
| Pin 12 | AINN4 β Channel 4 negative differential input |
| Pin 13 | AINP5 β Channel 5 positive differential input |
| Pin 14 | AINN5 β Channel 5 negative differential input |
| Pin 15 | AINP6 β Channel 6 positive differential input |
| Pin 16 | AINN6 β Channel 6 negative differential input |
| Pin 17 | AINP7 β Channel 7 positive differential input |
| Pin 18 | AINN7 β Channel 7 negative differential input |
| Pin 19 | SCLK β SPI serial clock input |
| Pin 20 | MOSI β SPI master data out / ADC data in |
| Pin 21 | MISO β SPI master data in / ADC data out |
| Pin 22 | CS β SPI chip select (active low) |
| Pin 23 | DRDY β Data ready indicator |
| Pin 24 | SYNC/RESET β Synchronization or reset input |
| Pin 25 | MCLK β Master clock input (or internal oscillator selected) |
| Pin 26 | GPIO0 β General-purpose input/output |
| Pin 27 | GPIO1 β General-purpose input/output |
| Pin 28 | DVDD β Digital power supply |
| Pin 29 | DGND β Digital ground |
| Pin 30 | VCAP β Internal LDO regulator capacitor |
| Pin 31 | EP β Exposed pad - connect to analog ground |
| Pin 32 | NC β No connection |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
ADS131M08IPBS is suitable for 6 applications: Three-Phase Energy Metering, Circuit Breakers and Protective Relays, Solar Inverter Power Metrology, Motor Drive Current Sensing, Bidirectional DC-DC Converter Control, Industrial Power Quality Analyzers.
Three-Phase Energy Metering
The ADS131M08's eight simultaneously-sampling differential inputs capture all three phase voltages and currents at the same instant, which is essential for accurate active, reactive, and apparent power computation where phase error directly impacts metering accuracy class. Its 24-bit resolution and 102-dB dynamic range at 4 kSPS support wide-current-range meters, while the PGA (gain up to 128) allows direct connection to shunts or current transformers without external amplifiers. Inputs interface directly to resistor-divider networks, and the low-drift internal reference reduces external component count. The 32-kSPS data rate provides substantial oversampling over the 50/60 Hz fundamental for harmonics analysis.
Recommended
Circuit Breakers and Protective Relays
Protective devices require simultaneous sampling of multiple current and voltage channels to correctly compute phase relationships and detect faults such as overcurrent, earth leakage, and phase loss. The ADS131M08's simultaneous sampling across all eight differential inputs eliminates channel-to-channel skew, while the 24-bit resolution resolves small leakage currents at the bottom of the measurement range. The automotive ADS131M08QPBSRQ1 variant adds AEC-Q100 qualification (-40Β°C to +125Β°C) and functional-safety-capable documentation, which protective-equipment designers need for safety-integrity arguments in circuit breaker and relay platforms.
Recommended
Solar Inverter Power Metrology
Grid-tied solar inverters need precise measurement of DC input and AC output power for maximum power point tracking, grid compliance, and billing-grade metering. The ADS131M08 simultaneously samples DC bus voltage/current and multi-phase AC channels with 24-bit resolution and up to 32 kSPS, enabling accurate power and energy computation with adequate oversampling for THD analysis. Its differential inputs reject common-mode noise from the power stage, and the programmable gain up to 128 lets one converter family cover both low-voltage DC sensing and CT-based AC sensing. The low-drift internal reference stabilizes gain accuracy over the inverter's wide temperature range.
Recommended
Motor Drive Current Sensing
Servo and industrial motor drives use the ADS131M08 to sample three-phase motor currents plus DC-link voltage simultaneously, giving the control MCU phase-accurate feedback for field-oriented control and protection. The 32-kSPS programmable rate fits typical PWM control loop update rates, while the 24-bit resolution and 80-dB dynamic range at gain = 64 resolve low-speed, low-current operation where shunt signals are in the millivolt range. Differential inputs directly interface to shunt resistors with the PGA set to 64 or 128, removing discrete amplifier stages. The SPI interface with CRC provides robust data transfer to the drive controller in noisy inverter environments.
Recommended
Bidirectional DC-DC Converter Control
TI's reference design for precisely controlling the current and voltage of a bidirectional interleaved buck-converter power stage pairs the ADS131M08 with a C2000 microcontroller. The ADC samples the power-stage voltage and current feedback signals simultaneously, allowing the C2000 to close high-accuracy control loops and monitor efficiency with one device. The 24-bit resolution captures fine current ripple for cycle-by-cycle monitoring, and the low-drift internal reference keeps measurement gain stable across thermal transients. Energy-measurement-oriented features also let the controller log converted energy, useful in battery testing and grid-storage converter applications.
Recommended
Industrial Power Quality Analyzers
Power quality analyzers measure harmonics, flicker, unbalance, and interharmonics across multiple channels simultaneously. The ADS131M08's simultaneous 8-channel sampling preserves phase relationships needed for correct power-direction and unbalance calculations, and the 32-kSPS maximum rate supports harmonic analysis up to the 250th order of a 60 Hz fundamental with suitable digital post-processing. Its 24-bit noise floor (102-dB dynamic range at gain = 1, 4 kSPS) captures both high-energy fundamental and small harmonic components in a single acquisition, while direct CT and divider interfacing simplifies the analog front end of the instrument.
Recommended
Recommended Products Summary
Engineering reference data for ADS131M08IPBS β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADS131M08QPBSRQ1 | ADS131M06IPBS | ADS131M04IPBS | ADS131E08SPAGR |
|---|---|---|---|---|---|
| Package | 32-TQFP (5x5 mm) | 32-TQFP (5x5 mm) - same | 32-TQFP (5x5 mm) - same | 32-TQFP (5x5 mm) - same | TQFP-64 - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Channels | 8 simultaneous differential | 8 simultaneous differential | 6 simultaneous differential | 4 simultaneous differential | 8 simultaneous differential |
| Resolution | 24 bit | 24 bit | 24 bit | 24 bit | 24 bit |
| 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 | [DATA_NEEDED] |
| PGA Gain Range | Up to 128 | Up to 128 | Up to 128 | Up to 128 | [DATA_NEEDED] |
| AEC-Q100 Qualification | No (standard grade) | Yes, grade 1 (-40C to +125C) | No | [DATA_NEEDED] | No |
| Internal Reference | Yes, low-drift | Yes, low-drift | Yes, low-drift | Yes, low-drift | [DATA_NEEDED] |
Key Differentiators
- Full 8-channel simultaneous sampling in a compact 5x5 mm TQFP (vs ADS131M06IPBS)
- Automotive-qualified sibling available with identical footprint (vs ADS131M08QPBSRQ1)
- Purpose-built energy-metrology feature set vs general-purpose family (vs ADS131E08SPAGR)
Design Notes
Separate the analog and digital ground regions and join them at a single point under the exposed pad; connect the EP solidly to the analog ground plane with a via array for both grounding and thermal performance. Route the eight differential input pairs as tightly coupled, matched-length pairs away from the SPI clock lines. Place antialiasing RC filters (typically 1 kOhm / 1 nF class) directly at each AINP/AINN pin since the delta-sigma modulator still samples at a high internal rate.
Supply the analog domain from a low-noise rail; a linear regulator such as the TPS7A4700 or TPS7A8300 family is preferable to a buck converter output feeding AVDD directly. Decouple AVDD, DVDD, and the internal LDO VCAP pin per the datasheet values with 100 nF ceramics placed within 2 mm of the pins. If an external reference is used instead of the internal low-drift reference, buffer it and share reference accuracy across all channels - reference error appears identically on all eight channels.
Resistor-divider and CT burden tolerances dominate system accuracy because all channels share the same silicon - do not expect ADC matching to fix front-end errors; use 0.1% dividers for metering-class designs. Do not exceed the differential input range at high PGA settings (gain up to 128 sharply reduces full-scale headroom). Also verify SPI timing and use the CRC feature in noisy environments such as inverters; unchecked SPI corruption can silently produce invalid samples.
Compliance Information
AEC-Q100 qualification (temperature grade 1, -40C to +125C) applies to the ADS131M08QPBSRQ1 automotive variant per TI datasheet; the standard IPBS part is industrial grade. RoHS compliance per TI product page.
