Texas Instruments ADS131M04IRUKT

Overview

ADS131M04IRUKT from Texas Instruments is a 4-channel, simultaneously-sampling, 24-bit delta-sigma ADC optimized for energy metering and power metrology. It delivers 102-dB dynamic range at 4 kSPS/gain=1, supports programmable gain up to 128, and operates from 2.7-V to 3.6-V supplies across –40°C to +125°C. Its integrated 1.2-V reference, high-impedance inputs (≥1-MΩ at gain ≥8), and channel-to-channel phase calibration enable direct connection to current transformers, shunts, and Rogowski coils in electricity meters and protection relays.

For engineers reviewing the ADS131M04IRUKT datasheet, ADS131M04IRUKT pinout, ADS131M04IRUKT application, or ADS131M04IRUKT equivalent, this page provides verified technical context, real-world performance boundaries (e.g., –120 dB crosstalk, –100 dB THD), package-specific thermal metrics, and validated alternative options for metering-grade signal acquisition.

Technical Context

The ADS131M04IRUKT implements four independent delta-sigma modulators with synchronized sampling, SINC3 + SINC1 digital filtering, and global-chop mode for offset drift reduction. Each channel features a low-noise PGA (gains 1–128), programmable phase delay calibration (244-ns resolution), and CRC-protected SPI communication (CPOL=0, CPHA=1).

It integrates a low-drift 1.2-V internal voltage reference (±0.1% initial accuracy, 7.5 ppm/°C drift), negative charge pump for sub-ground input support, and current-detect mode for <1-µA tamper monitoring. Power modes include high-resolution (64 kSPS), low-power (32 kSPS), and very-low-power (16 kSPS) - all with fast startup (<0.5 ms).

Key Specifications

Pinout & Package

ADS131M04IRUKT is packaged in a 20-pin WQFN (RUK) with 3.00 mm × 3.00 mm body size and exposed thermal pad connected to AGND. Pinout supports daisy-chain SPI, simultaneous channel synchronization via SYNC/RESET, and flexible supply decoupling (CAP pin for internal LDO output).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 4-channel, simultaneous-sampling, 24-bit delta-sigma ADC applications.

Compared with ADS131M04IPWR, the ADS131M04IRUKT offers superior thermal performance and smaller footprint for production metering designs; versus AD7768-4, it delivers lower power, integrated reference, and simpler synchronization - making it the optimal choice for IEC-compliant electricity meters and protection relays.

Availability

ADS131M04IRUKT is available at Aetrix Electronics and suitable for electricity meters, circuit breakers, and protection relays requiring stable component supply, long-lifecycle support, and guaranteed traceability for industrial certification.

Supply support for ADS131M04IRUKT 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 decades of leadership in precision data converters and energy measurement solutions.

The ADS131M04 product line was designed specifically for revenue-grade energy metering and power system protection - integrating metrology-grade accuracy, robust EMC performance, and system-level features like CRC and phase calibration into a single IC.

FAQ

What is the maximum data rate supported by the ADS131M04IRUKT?

The ADS131M04IRUKT supports up to 64 kSPS in high-resolution mode with fCLKIN = 8.192 MHz. This rate is confirmed in Revision D (May 2021) of the official datasheet and enables harmonic analysis up to the 50th order at 50/60 Hz. Lower power modes offer 32 kSPS (low-power) and 16 kSPS (very-low-power), all maintaining 24-bit resolution and simultaneous sampling across all four channels.

Does the ADS131M04IRUKT require an external voltage reference?

No, the ADS131M04IRUKT integrates a low-drift 1.2-V internal voltage reference with ±0.1% initial accuracy and 7.5 ppm/°C temperature drift. This eliminates the need for external reference components, reduces PCB area, and simplifies design for IEC 62053-21 compliance. The reference is factory-trimmed and supports all gain settings and data rates without recalibration.

How does the ADS131M04IRUKT handle channel-to-channel crosstalk in multi-phase systems?

The ADS131M04IRUKT achieves –120 dB crosstalk between channels at 50/60 Hz, verified under standard test conditions. This performance is enabled by fully differential architecture, separate modulator cores, and careful on-die isolation - ensuring accurate independent measurement of L1, L2, L3, and neutral in 3-phase electricity meters without signal leakage affecting power calculations.

Can the ADS131M04IRUKT interface directly with current transformers and shunt resistors?

Yes, the ADS131M04IRUKT supports direct connection to both current transformers and shunt resistors. Its high-input impedance (≥1 MΩ at gains ≥8) minimizes loading on CT secondaries, while the integrated negative charge pump allows input signals down to AGND –1.3 V - accommodating bipolar shunt voltages and enabling bidirectional current measurement without external level-shifting circuitry.

What is the purpose of the CAP pin on the ADS131M04IRUKT?

The CAP pin on the ADS131M04IRUKT is the output of an internal digital low-dropout (LDO) regulator. It must be decoupled with a 220-nF capacitor to DGND. When CAP is tied to DVDD, the internal LDO is bypassed - reducing digital supply noise and improving SNR in sensitive metrology applications. This configuration is explicitly supported in the datasheet's Recommended Operating Conditions table.