Texas Instruments ADS131B02QPWRQ1

Overview

ADS131B02QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified, 2-channel, simultaneous-sampling, 24-bit delta-sigma ADC with programmable gain up to 128, 0.82 μVRMS noise at 1 kSPS/gain=8, and integrated 1.2-V low-drift reference - designed for high-accuracy current-shunt and voltage measurements in battery management systems.

For engineers reviewing the ADS131B02QPWRQ1 datasheet, ADS131B02QPWRQ1 pinout, ADS131B02QPWRQ1 application, or ADS131B02QPWRQ1 equivalent, key selection considerations include simultaneous sampling integrity (–120 dB crosstalk), global-chop offset drift suppression (<30 nV/°C), unipolar supply operation with integrated negative charge pump (enabling sub-ground input), and SPI interface with CRC-protected register access.

Technical Context

The ADS131B02QPWRQ1 implements a dual ΔΣ modulator architecture with independent digital decimation filters per channel, supporting true simultaneous sampling across both differential inputs. Its global-chop mode eliminates offset drift over temperature and time, while programmable gain amplifier (PGA) settings (1–128) scale full-scale range from ±1.2 V down to ±9.375 mV using the internal 1.2-V reference.

It operates from 2.7 V to 3.6 V analog/digital supplies, integrates a precision 8.192-MHz oscillator (±0.5% accuracy), and supports three power-scaling modes (high-resolution, low-power, very-low-power) - enabling trade-offs between data rate (up to 32 kSPS), noise (0.82 μVRMS), and total power (3 mW at 3.3 V).

Key Specifications

Pinout & Package

ADS131B02QPWRQ1 is housed in a 20-pin TSSOP package (6.50 mm × 4.40 mm), optimized for thermal performance (R_θJA = 91.5°C/W) and automotive board space constraints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS131M02IPWR and AD7779ACPZ, the ADS131B02QPWRQ1 uniquely combines AEC-Q100 Grade 1 qualification, integrated negative charge pump for unipolar sub-ground sensing, and functional safety documentation - making it the only drop-in solution for production automotive BMS with stringent safety and space constraints.

Availability

ADS131B02QPWRQ1 is available at Aetrix Electronics and suitable for EV charging stations, automotive battery management systems, and energy storage systems requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.

Supply support for ADS131B02QPWRQ1 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-grade signal chain solutions.

The ADS131B02QPWRQ1 belongs to TI's high-precision, automotive-qualified delta-sigma ADC product line - engineered specifically for functional safety-compliant battery monitoring, energy metering, and high-reliability industrial sensing.

FAQ

What is the maximum data rate supported by the ADS131B02QPWRQ1?

The ADS131B02QPWRQ1 supports up to 32 kSPS per channel in high-resolution mode with fCLKIN = 8.192 MHz. Data rate scales with power mode: 16 kSPS in low-power mode (fCLKIN = 4.096 MHz) and 8 kSPS in very-low-power mode (fCLKIN = 2.048 MHz). All rates maintain simultaneous sampling across both channels without inter-channel skew.

Does the ADS131B02QPWRQ1 require an external voltage reference?

No, the ADS131B02QPWRQ1 integrates a precision 1.2-V low-drift bandgap reference with ±0.7% gain error and 13 ppm/°C drift over –40°C to +125°C. This eliminates the need for external reference components, reduces PCB area, and improves system-level accuracy without additional calibration overhead.

How does the global-chop mode improve measurement stability in the ADS131B02QPWRQ1?

The global-chop mode in the ADS131B02QPWRQ1 actively cancels offset drift over temperature and time, reducing offset drift to 10–30 nV/°C and long-term drift to 0.25 μV over 1000 hours. This enables stable, high-accuracy measurements in automotive environments without periodic recalibration - a critical requirement for ASIL-B/C BMS compliance.

Can the ADS131B02QPWRQ1 measure signals below ground potential?

Yes, the ADS131B02QPWRQ1 integrates a negative charge pump that allows analog input voltages as low as –0.3 V relative to AGND while operating from a single 3.3-V supply. This enables bidirectional current measurement using shunt resistors without requiring dual-supply circuitry or level-shifting components.

What SPI interface features does the ADS131B02QPWRQ1 support?

The ADS131B02QPWRQ1 supports standard SPI with CPOL = 0 and CPHA = 1 timing, including CRC protection on data transfers and register map access. It uses active-low CS, DRDY for interrupt-driven reads, and SYNC/RESET for multi-device synchronization - ensuring robust communication in electrically noisy automotive environments.