Texas Instruments ADS131M06IRSNR

Overview

ADS131M06IRSNR from Texas Instruments is a 6-channel, simultaneously-sampling, 24-bit delta-sigma analog-to-digital converter optimized for energy metrology. It delivers 102-dB dynamic range at 4 kSPS (gain = 1), supports programmable gain up to 128, features integrated 1.2-V low-drift reference, and operates from 2.7–3.6 V supplies with 4.9 mW total power consumption. It is used in electricity meters and protection relays for high-accuracy current/voltage sampling.

For engineers reviewing the ADS131M06IRSNR datasheet, ADS131M06IRSNR pinout, ADS131M06IRSNR application, or ADS131M06IRSNR equivalent, key selection considerations include simultaneous 6-channel sampling integrity, channel-to-channel phase calibration (244-ns resolution), crosstalk rejection (–120 dB), current-detect mode for tamper detection, and WQFN-32 package compatibility with industrial temperature operation (–40°C to +125°C).

Technical Context

The ADS131M06IRSNR implements six independent delta-sigma modulators with matched digital filters and per-channel programmable gain amplifiers (PGA), enabling true simultaneous sampling across all channels. Its architecture includes integrated negative charge pump for sub-ground input support, global-chop mode for offset drift reduction (105 nV/°C), and CRC protection on SPI communications and register access.

It supports three power modes-high-resolution (32 kSPS), low-power (16 kSPS), and very-low-power (8 kSPS)-each tied to specific fCLKIN ranges (8.192 MHz / 4.096 MHz / 2.048 MHz). Phase delay calibration and independent offset/gain registers per channel allow precise signal-chain error correction in polyphase metering systems.

Key Specifications

Pinout & Package

The ADS131M06IRSNR is packaged in a 32-pin WQFN (RSN) with 4.00 mm × 4.00 mm body size and exposed thermal pad connected to AGND. Pin functions are electrically identical to the TQFP variant, with NC pins at positions 9–12 and 27; SYNC/RESET serves dual role for synchronization or system reset.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 6-channel, high-accuracy delta-sigma ADC applications.

Compared with ADS131M04IRSNR, the ADS131M06IRSNR adds two fully featured differential channels without compromising noise, drift, or power-making it optimal for 3-phase systems. Versus AD7606C-6BSTZ, it trades raw speed for 6 dB higher dynamic range and integrated metrology-specific features like phase calibration and current-detect mode.

Availability

ADS131M06IRSNR is available at Aetrix Electronics and suitable for electricity meters, protection relays, circuit breakers, and power quality analyzers requiring stable component supply across extended product lifecycles.

Supply support for ADS131M06IRSNR 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, embedded processing, and high-reliability ICs for industrial, automotive, and energy infrastructure markets.

The ADS131M06IRSNR belongs to TI's precision energy measurement ADC portfolio, designed specifically to replace discrete metrology AFEs in revenue-grade metering and grid-edge protection equipment.

FAQ

What is the maximum achievable data rate for ADS131M06IRSNR in high-resolution mode?

The ADS131M06IRSNR achieves a maximum data rate of 32 kSPS in high-resolution mode when configured with fCLKIN = 8.192 MHz. This rate applies to all six channels simultaneously and maintains full 24-bit resolution and 102-dB dynamic range at gain = 1 and 4 kSPS-though higher rates trade off some dynamic range per the device's selectable power modes. The ADS131M06IRSNR supports lower rates (16 kSPS, 8 kSPS) in low-power and very-low-power modes for thermal or energy-constrained deployments.

Does ADS131M06IRSNR support external reference input, and what voltage range is acceptable?

Yes, the ADS131M06IRSNR supports external reference input via the REFIN pin, accepting a voltage range of 1.1 V to 1.3 V. When using the external reference, the internal 1.2-V reference is disabled. The device does not require decoupling capacitance on REFIN unless current-detect mode is active-TI explicitly warns against placing capacitance there in that mode. The ADS131M06IRSNR's analog input full-scale range scales directly with the selected reference voltage and PGA gain setting.

How does the current-detect mode function in ADS131M06IRSNR, and what is its power impact?

The current-detect mode in ADS131M06IRSNR reduces total power consumption to 4.5 mW while maintaining sufficient ADC functionality to monitor low-level current signals for tamper detection-such as detecting unauthorized enclosure opening or magnetic interference. In this mode, the device remains responsive to DRDY and retains SPI register access, enabling periodic wake-up and status reporting. The ADS131M06IRSNR enters current-detect mode under specific supply conditions (AVDD/DVDD ≥ 2.4 V) and register configuration, making it ideal for battery-backed security monitoring in smart meters.

What is the purpose of the CAP pin on ADS131M06IRSNR, and how must it be decoupled?

The CAP pin on ADS131M06IRSNR is the output of an internal digital low-dropout (LDO) regulator that supplies the digital core when DVDD exceeds 2.0 V. It must be decoupled with a 220-nF capacitor connected directly to DGND. This LDO allows DVDD to operate at 1.65–2.0 V while maintaining stable digital logic voltage, reducing overall system power. The ADS131M06IRSNR datasheet specifies no other components on CAP and warns against connecting it to AVDD or leaving it floating-proper decoupling is essential for SPI timing integrity and DRDY reliability.

Can ADS131M06IRSNR perform phase calibration between channels, and what is its resolution?

Yes, the ADS131M06IRSNR provides programmable channel-to-channel phase delay calibration with 244-ns resolution when fCLKIN = 8.192 MHz. This feature corrects for fixed timing mismatches caused by PCB trace length differences or sensor propagation delays-critical for accurate phasor angle calculation in 3-phase energy metering. Calibration values are stored in dedicated registers and applied digitally within each channel's filter path. The ADS131M06IRSNR supports independent calibration per channel pair, and the function remains active across all power modes and gain settings.