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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Texas Instruments ADS131M03QPWRQ1

Name: ADS131M03QPWRQ1
Brand: Texas Instruments
SKU: ADS131M03QPWRQ1
Price: 2.40 USD
Availability: InStock
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Part No.:: ADS131M03QPWRQ1

Manufacturer:: Texas Instruments

Category:: Analog to Digital Converters (ADC)

Package:: 20-TSSOP (0.173", 4.40mm Width)

Datasheet:: ADS131M03QPWRQ1.pdf

Description:: AUTOMOTIVE, THREE-CHANNEL, 24-BI

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Product details

Overview

ADS131M03QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) automotive-grade, 3-channel, simultaneous-sampling, 24-bit delta-sigma ADC with programmable gain up to 128, 102-dB dynamic range at 4 kSPS/gain=1, and integrated 1.2-V low-drift reference - designed for high-accuracy current-shunt, voltage-divider, and thermistor measurements in battery management systems.

For engineers reviewing the ADS131M03QPWRQ1 datasheet, ADS131M03QPWRQ1 pinout, ADS131M03QPWRQ1 application, or ADS131M03QPWRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive BMS use cases, and two rigorously cross-checked alternative parts - all aligned to TI's SBASAJ3 production data sheet (August 2022).

Technical Context

The ADS131M03QPWRQ1 implements three independent delta-sigma modulators with synchronized sampling clocks and per-channel digital decimation filters, enabling true simultaneous acquisition across all three differential inputs. Its architecture integrates a programmable gain amplifier (PGA), channel-to-channel phase delay calibration (244-ns resolution), and global-chop mode for offset drift reduction.

It supports three power-scaling modes (high-resolution, low-power, very-low-power) tied directly to external CLKIN frequency (8.192/4.096/2.048 MHz), with corresponding data rates up to 64 kSPS, 32 kSPS, and 16 kSPS. Communication uses SPI (CPOL = 0, CPHA = 1) with CRC protection on register access and data transfers.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	24-bit delta-sigma - enables 1-µV-level resolution in shunt-based current sensing with 1-mΩ resistor at 100-A full scale.
Sampling	Simultaneous 3-channel differential - eliminates inter-channel timing skew critical for multi-cell BMS voltage balancing and phase-aligned motor control feedback.
Data Rate	Up to 64 kSPS (high-res mode) - supports real-time monitoring of fast transients in EV DC e-metering and regenerative braking events.
Dynamic Range	102 dB at gain=1, 4 kSPS - achieves >16.6 effective bits for high-fidelity battery cell voltage measurement under noise-prone automotive EMI conditions.
Input Impedance	≥1 MΩ at gains ≥8 - allows direct connection to high-impedance thermistors and analog temperature sensors without external buffering.
Power Consumption	3.6 mW total at 3-V supplies - enables thermally constrained placement near battery cells in compact BMS modules.
Reference	Integrated 1.2-V ±0.1% initial accuracy, 7.5 ppm/°C drift - eliminates external reference IC and reduces PCB area/cost in space-constrained automotive modules.

Pinout & Package

ADS131M03QPWRQ1 is housed in a 20-pin TSSOP package (6.50 mm × 4.40 mm), optimized for thermal performance (R_θJA = 94.9°C/W) and automotive board-level reliability.

Pin/Terminal	Circuit Role	Design Meaning
AIN0P / AIN0N AIN1P / AIN1N AIN2P / AIN2N	Differential analog inputs (x3 channels)	Accept bidirectional shunt currents (±100 A typical) or high-voltage divider outputs; support input signals down to AGND – 1.3 V via integrated negative charge pump.
AVDD, AGND DVDD, DGND	Analog/digital supply rails	Separate AVDD (2.7–3.6 V) and DVDD (1.65–3.6 V) enable flexible power domain partitioning; AGND–DGND offset ≤ ±0.3 V ensures signal integrity in mixed-signal layouts.
SCLK, DIN, DOUT, CS	SPI interface	Standard 4-wire SPI (CPOL=0, CPHA=1); DRDY indicates ready data; supports daisy-chain or multi-device synchronization via SYNC/RESET.
CLKIN	External clock input	Accepts 0.3–8.192 MHz clock; sets operating mode (HR/LP/VLP) and exact data rate - no internal oscillator required for timing-critical BMS applications.
SYNC/RESET	Multi-device sync or reset	Active-low pulse synchronizes conversion start across multiple ADS131M03QPWRQ1 devices - essential for stacked battery pack monitoring with <100-ns inter-device skew.
CAP	LDO output	Provides regulated 1.8-V supply for DVDD when shorted to DVDD; requires 220-nF capacitor to DGND for stability in low-noise BMS sensor front-ends.

Key Features

Feature	Design Value
Automotive qualification	AEC-Q100 Grade 1 (–40°C to +125°C ambient) - qualified for under-hood and battery-pack mounting without derating or external thermal management.
Functional safety support	Documentation available for ISO 26262 ASIL-B system integration - includes FIT rate, failure modes, and diagnostic coverage guidance for BMS safety mechanisms.
Crosstalk suppression	–120 dB channel-to-channel crosstalk - prevents leakage between adjacent high-voltage cell measurements in series-connected battery strings.
Noise performance	5.35 µV_RMS input-referred noise at 4 kSPS/gain=1 - enables <100-µΩ shunt resolution for precision current monitoring in 800-V EV platforms.
Fast startup	First valid sample within 0.5 ms of supply ramp - meets automotive cold-cranking and wake-on-bus timing requirements for immediate BMS readiness.
CRC protection	Cyclic redundancy check on SPI data, commands, and register map - detects bit errors induced by automotive EMI during firmware updates or configuration writes.

Applications

Automotive Battery Management System (BMS)	EV DC Charging Station Metering
Use Scenario: Real-time monitoring of 12–24 series-connected Li-ion cells in traction battery packs, including current-shunt sensing, cell voltage via resistor dividers, and NTC thermistor temperature tracking. IC Role / Device Role / Timing Role: Simultaneous-sampling 24-bit ADC providing time-aligned voltage/current/temperature samples for state-of-charge (SoC) and state-of-health (SoH) estimation algorithms. Use Value: 102-dB dynamic range and <100-ns inter-channel skew ensure accurate detection of microvolt-level cell imbalance and early-stage thermal runaway precursors.	Use Scenario: Bidirectional energy metering in CCS/GB/T DC fast chargers, measuring grid-side AC input and vehicle-side DC output with metrology-grade accuracy. IC Role / Device Role / Timing Role: High-precision ADC capturing synchronized current and voltage waveforms for IEEE 1459-compliant active/reactive power calculation. Use Value: 80-dB dynamic range at gain=64 enables 0.1% Class 0.2 metering accuracy across 100:1 dynamic current range (1–100 A) without range switching.
Energy Storage System (ESS) Rack Monitoring	Onboard Charger (OBC) Sensor Interface
Use Scenario: Centralized monitoring of parallel battery racks in grid-scale ESS, where multiple ADS131M03QPWRQ1 devices are synchronized to capture aggregate current, voltage, and thermal gradients. IC Role / Device Role / Timing Role: Synchronized multi-ADC node delivering phase-aligned samples to FPGA or MCU for harmonic analysis and aging trend modeling. Use Value: SYNC/RESET pin enables sub-microsecond inter-device alignment across 10+ units - critical for detecting millisecond-scale degradation patterns in large-format LFP cells.	Use Scenario: Sensing primary-side AC current, secondary-side DC output current, and heatsink temperature in bi-directional OBCs for thermal derating and efficiency optimization. IC Role / Device Role / Timing Role: Integrated PGA and high-Z inputs interface directly to current transformers, shunts, and analog-output temperature ICs without external op-amps. Use Value: ≥1-MΩ input impedance at gain ≥8 eliminates loading error on 10-kΩ NTC thermistors, preserving ±0.5°C temperature accuracy over full automotive temperature range.

Automotive Battery Management System (BMS)

EV DC Charging Station Metering

Use Scenario: Real-time monitoring of 12–24 series-connected Li-ion cells in traction battery packs, including current-shunt sensing, cell voltage via resistor dividers, and NTC thermistor temperature tracking.

IC Role / Device Role / Timing Role: Simultaneous-sampling 24-bit ADC providing time-aligned voltage/current/temperature samples for state-of-charge (SoC) and state-of-health (SoH) estimation algorithms.

Use Value: 102-dB dynamic range and <100-ns inter-channel skew ensure accurate detection of microvolt-level cell imbalance and early-stage thermal runaway precursors.

Use Scenario: Bidirectional energy metering in CCS/GB/T DC fast chargers, measuring grid-side AC input and vehicle-side DC output with metrology-grade accuracy.

IC Role / Device Role / Timing Role: High-precision ADC capturing synchronized current and voltage waveforms for IEEE 1459-compliant active/reactive power calculation.

Use Value: 80-dB dynamic range at gain=64 enables 0.1% Class 0.2 metering accuracy across 100:1 dynamic current range (1–100 A) without range switching.

Energy Storage System (ESS) Rack Monitoring

Onboard Charger (OBC) Sensor Interface

Use Scenario: Centralized monitoring of parallel battery racks in grid-scale ESS, where multiple ADS131M03QPWRQ1 devices are synchronized to capture aggregate current, voltage, and thermal gradients.

IC Role / Device Role / Timing Role: Synchronized multi-ADC node delivering phase-aligned samples to FPGA or MCU for harmonic analysis and aging trend modeling.

Use Value: SYNC/RESET pin enables sub-microsecond inter-device alignment across 10+ units - critical for detecting millisecond-scale degradation patterns in large-format LFP cells.

Use Scenario: Sensing primary-side AC current, secondary-side DC output current, and heatsink temperature in bi-directional OBCs for thermal derating and efficiency optimization.

IC Role / Device Role / Timing Role: Integrated PGA and high-Z inputs interface directly to current transformers, shunts, and analog-output temperature ICs without external op-amps.

Use Value: ≥1-MΩ input impedance at gain ≥8 eliminates loading error on 10-kΩ NTC thermistors, preserving ±0.5°C temperature accuracy over full automotive temperature range.

Equivalent & Alternatives

The following parts are listed as comparable options for similar 24-bit simultaneous-sampling ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADS131M04QPWRQ1	4-channel version, identical architecture, same 20-pin TSSOP package, 64-kSPS max, 102-dB DR at 4 kSPS	Supports 4-sensor systems (e.g., 3-phase motor + temperature) without layout change; adds one extra differential input	Select when fourth channel is needed for auxiliary sensing; pin-compatible with ADS131M03QPWRQ1 but requires updated firmware channel mapping.
AD7779ACPZ	8-channel, 24-bit, simultaneous-sampling ADC; SPI interface; 100-dB DR at 128 kSPS; requires external reference and separate AVDD/DVDD regulators	Higher channel count and speed suit industrial PLCs; lacks AEC-Q100 qualification and integrated charge pump	Use in non-automotive, higher-channel-count applications where extended temperature range is not required and external reference is acceptable.

Compared with ADS131M03QPWRQ1, the ADS131M04QPWRQ1 offers seamless scalability to four sensors in the same footprint, while the AD7779ACPZ provides greater channel density at the cost of automotive qualification and increased BOM complexity - making ADS131M03QPWRQ1 optimal for cost- and space-constrained BMS nodes requiring guaranteed automotive reliability.

Availability

ADS131M03QPWRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, EV charging infrastructure, and energy storage system monitoring requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.

Supply support for ADS131M03QPWRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with deep expertise in automotive electronics and functional safety design.

The ADS131M03QPWRQ1 belongs to TI's high-precision delta-sigma ADC product line, engineered specifically for automotive battery monitoring - emphasizing simultaneous sampling, low power, integrated reference, and AEC-Q100 reliability in harsh environments.

FAQ

What is the maximum data rate supported by the ADS131M03QPWRQ1?

The ADS131M03QPWRQ1 supports up to 64 kSPS in high-resolution mode with fCLKIN = 8.192 MHz. This maximum rate applies to all three channels simultaneously, with each channel delivering a full 24-bit sample per conversion cycle. Lower power modes reduce the rate to 32 kSPS (low-power) and 16 kSPS (very-low-power), scaling linearly with clock frequency.

Does the ADS131M03QPWRQ1 require an external reference voltage?

No, the ADS131M03QPWRQ1 integrates a precision 1.2-V low-drift reference with ±0.1% initial accuracy and 7.5 ppm/°C temperature drift. This eliminates the need for an external reference IC, reducing BOM count and PCB area - a key advantage for compact automotive BMS modules where space and thermal management are constrained.

How does the ADS131M03QPWRQ1 handle input signals below ground?

The ADS131M03QPWRQ1 incorporates an integrated negative charge pump that enables absolute analog input voltages as low as AGND – 1.3 V. This allows direct measurement of bidirectional current through shunt resistors in single-supply systems - critical for regenerative braking current sensing in EVs without requiring level-shifting circuitry.

What is the purpose of the SYNC/RESET pin on the ADS131M03QPWRQ1?

The SYNC/RESET pin serves dual functions: a short low pulse (<2048 × t_CLKIN) performs a hardware reset, while a longer pulse (1–2047 × t_CLKIN) synchronizes conversion start across multiple ADS131M03QPWRQ1 devices. This ensures sub-microsecond timing alignment for stacked battery pack monitoring and multi-sensor systems requiring deterministic phase relationships.

Is the ADS131M03QPWRQ1 compatible with standard SPI interfaces?

Yes, the ADS131M03QPWRQ1 uses a standard 4-wire SPI interface with CPOL = 0 and CPHA = 1. It supports daisy-chaining via DOUT-to-DIN and accepts standard SPI commands for register read/write, data acquisition, and configuration. CRC protection is applied to all SPI transactions to ensure robust communication in electrically noisy automotive environments.

ADS131M03QPWRQ1 Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 20-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Number of Bits:: 24

Sampling Rate (Per Second):: 64k

Number of Inputs:: 3

Input Type:: Differential, Single Ended

Data Interface:: Serial, SPI

Configuration:: ADC

Ratio - S/H:ADC:: 0:3

Number of A/D Converters:: 3

Architecture:: Sigma-Delta

Reference Type:: Internal

Voltage - Supply, Analog:: 2.4V ~ 3.6V, 2.7V ~ 3.6V

Voltage - Supply, Digital:: 1.65V ~ 2V, 2.7V ~ 3.6V

Features:: Simultaneous Sampling

Operating Temperature:: -40°C ~ 125°C (TA)

Supplier Device Package:: 20-TSSOP

Mounting Type:: Surface Mount

Grade:: Automotive

Qualification:: AEC-Q100

ADS131M03QPWRQ1 FAQ

1.How can I place an order for ADS131M03QPWRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for ADS131M03QPWRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ADS131M03QPWRQ1 reliable?

The price and inventory of ADS131M03QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS131M03QPWRQ1 is usually 5 days.

3.What payment methods are accepted for ADS131M03QPWRQ1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS131M03QPWRQ1 transactions.

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4.How is shipping managed for ADS131M03QPWRQ1?

ADS131M03QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ADS131M03QPWRQ1 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ADS131M03QPWRQ1?

For technical support, including ADS131M03QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS131M03QPWRQ1 requirements.

6.How does Aetrix verify that ADS131M03QPWRQ1 is sourced from the original manufacturer or authorized distributors?

All ADS131M03QPWRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS131M03QPWRQ1 meets industry standards.

7.What is the process for return or replacement of ADS131M03QPWRQ1?

All ADS131M03QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with ADS131M03QPWRQ1, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ADS131M03QPWRQ1 part is unused and in its original packaging.

Return procedure for ADS131M03QPWRQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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