Texas Instruments ADS131M04QPWRQ1

Overview

ADS131M04QPWRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40°C to +125°C) automotive-qualified, 4-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 precision current, voltage, and temperature sensing in battery management systems.

For engineers reviewing the ADS131M04QPWRQ1 datasheet, ADS131M04QPWRQ1 pinout, ADS131M04QPWRQ1 application, or ADS131M04QPWRQ1 equivalent, key selection criteria include simultaneous sampling integrity, channel-to-channel phase calibration capability, input impedance ≥1 MΩ at high gain, crosstalk ≤–120 dB, and functional safety documentation support for ISO 26262 ASIL-B system integration.

Technical Context

The ADS131M04QPWRQ1 implements four independent delta-sigma modulators with synchronized clocking and digital decimation filters per channel, enabling true simultaneous sampling across all inputs without inter-channel skew. Its architecture includes a programmable gain amplifier (PGA) with eight discrete gain settings (1–128), global-chop mode for offset drift reduction, and configurable channel-to-channel phase delay (244-ns resolution).

It integrates a negative charge pump to support input signals down to AGND – 1.3 V, a CRC-protected SPI interface (CPOL=0, CPHA=1), and three power-scaling modes (high-resolution, low-power, very-low-power) that trade data rate (up to 64 kSPS aggregate) and dynamic range while maintaining consistent noise scaling with OSR and gain.

Key Specifications

Pinout & Package

ADS131M04QPWRQ1 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 PCB layout constraints.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS131M04QPWRQ1, the ADS131M06QPWRQ1 extends channel count while preserving pin-compatible register mapping and timing behavior, whereas AD7799BRUZ trades automotive qualification and simultaneous sampling for lower unit cost in non-safety applications - making ADS131M04QPWRQ1 the only option meeting ASIL-B BMS requirements with guaranteed 4-channel coherence.

Availability

ADS131M04QPWRQ1 is available at Aetrix Electronics and suitable for automotive battery management systems, EV charging station metering, and energy storage system monitoring requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant traceability.

Supply support for ADS131M04QPWRQ1 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 conditioning and power management solutions.

The ADS131M04QPWRQ1 belongs to TI's automotive-qualified precision ADC portfolio, engineered specifically for high-reliability battery monitoring, current sensing, and thermal acquisition in electric vehicle and energy infrastructure applications.

FAQ

What is the maximum supported external clock frequency for ADS131M04QPWRQ1?

The ADS131M04QPWRQ1 supports an external clock frequency up to 8.192 MHz in high-resolution mode. At this frequency, it achieves its maximum aggregate data rate of 64 kSPS. Clock frequencies above 8.192 MHz are outside the recommended operating conditions and may compromise timing margins, noise performance, or functional safety compliance. The device also supports lower clock rates (4.096 MHz and 2.048 MHz) for reduced power consumption in low-power and very-low-power modes.

Does ADS131M04QPWRQ1 support true simultaneous sampling across all four channels?

Yes, ADS131M04QPWRQ1 implements four independent delta-sigma modulators with a shared master clock and synchronized decimation filters, guaranteeing true simultaneous sampling with zero inter-channel skew. This is confirmed in the datasheet's "Simultaneous Sampling" section and validated by the channel-to-channel phase calibration feature, which adjusts for any residual propagation delay - essential for coherent voltage/current vector calculations in battery state estimation.

Can ADS131M04QPWRQ1 measure signals below ground potential?

Yes, ADS131M04QPWRQ1 integrates a negative charge pump that enables analog input voltages as low as AGND – 1.3 V. This allows direct measurement of bipolar shunt currents and grounded sensor outputs using a single 3.3-V supply - eliminating the need for dual-rail supplies or level-shifting circuitry in automotive BMS designs.

What functional safety documentation is available for ADS131M04QPWRQ1?

Texas Instruments provides functional safety documentation for ADS131M04QPWRQ1 including FMEDA reports, FIT rate data (121 failures-in-time), safety manual, and diagnostic coverage analysis - all aligned with ISO 26262 ASIL-B requirements. These documents are accessible through TI's functional safety portal and support system-level ASIL decomposition when used in conjunction with appropriate microcontroller and software diagnostics.

How does the input impedance of ADS131M04QPWRQ1 vary with PGA gain setting?

ADS131M04QPWRQ1 provides 330-kΩ differential input impedance at PGA gains of 1, 2, and 4, and ≥1-MΩ impedance at gains of 8, 16, 32, 64, and 128. This high impedance at elevated gains is achieved via an integrated precharge buffer, ensuring minimal loading error on high-resistance thermistor networks and precision voltage dividers - a key differentiator versus general-purpose ADCs lacking gain-dependent input buffering.