Texas Instruments ADS131M02IPWR

Overview

ADS131M02IPWR from Texas Instruments is a 2-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 features integrated 1.2-V low-drift reference and CRC-protected SPI interface - enabling direct high-accuracy current/voltage sensing in electricity meters and protection relays.

For engineers reviewing the ADS131M02IPWR datasheet, ADS131M02IPWR pinout, ADS131M02IPWR application, or ADS131M02IPWR equivalent, key selection criteria include simultaneous sampling integrity, channel-to-channel crosstalk (–120 dB), input impedance scalability (≥1 MΩ at gain ≥8), and operation across –40°C to +125°C with 2.7–3.6-V dual supplies.

Technical Context

The ADS131M02IPWR implements a dual-channel delta-sigma modulator architecture with independent PGA per channel (gain 1–128), on-chip 1.2-V reference (±0.1% initial accuracy, 7.5 ppm/°C drift), and digital filter supporting selectable oversampling ratios (OSR) from 64 to 16384. Its phase-shift calibration resolves 244 ns delays between channels using an 8.192-MHz CLKIN.

It integrates a negative charge pump for sub-ground analog input capability, current-detect mode for tamper detection (0.55 µA standby), and CRC coverage over register map and data transfers. The device operates in three power modes - high-resolution (2.3 mW), low-power (3.4 mW), and very-low-power (1.9 mW) - all maintaining 24-bit resolution.

Key Specifications

Pinout & Package

ADS131M02IPWR is packaged in a 20-pin WQFN (3.0 mm × 3.0 mm, RUK) with exposed thermal pad connected to AGND. Pin functions are identical to the TSSOP variant but with optimized layout for thermal performance and board space reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS131M04IPWR, ADS131M02IPWR saves board area and power in 2-channel systems; compared with AD7403BRIZ-RL7, it delivers complete metrology-ready signal chain - including reference, PGA, filtering, and SPI - without external components or isolation overhead.

Availability

ADS131M02IPWR is available at Aetrix Electronics and suitable for electricity meters, circuit breakers, and power quality analyzers requiring stable component supply, long-term lifecycle support, and automotive-grade temperature resilience.

Supply support for ADS131M02IPWR 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 ADS131M02IPWR belongs to TI's ADS131M family of metrology-optimized delta-sigma ADCs, designed specifically for high-accuracy, low-power, and thermally robust energy measurement in utility and industrial applications.

FAQ

What is the maximum data rate supported by the ADS131M02IPWR?

The ADS131M02IPWR supports up to 64 kSPS in high-resolution mode with fCLKIN = 8.192 MHz. This rate is achievable while maintaining 24-bit resolution and 102-dB dynamic range at gain = 1 and 4 kSPS - though maximum throughput scales inversely with OSR; at 64 kSPS, effective resolution remains ≥20 bits per channel.

Does the ADS131M02IPWR require an external voltage reference?

No, the ADS131M02IPWR integrates a precision 1.2-V low-drift reference with ±0.1% initial accuracy and 7.5 ppm/°C temperature coefficient. This eliminates the need for external references in most energy metering designs, reducing BOM cost and PCB area while ensuring traceable metrology-grade performance.

How does the ADS131M02IPWR handle channel-to-channel phase mismatch?

The ADS131M02IPWR provides programmable channel-to-channel phase delay calibration with 244-ns resolution, using the 8.192-MHz CLKIN as timing base. This allows compensation of PCB trace length differences to achieve <0.01° phase error at 50 Hz - essential for accurate reactive power and power factor calculations in the ADS131M02IPWR.

What power modes does the ADS131M02IPWR support, and how do they affect performance?

The ADS131M02IPWR offers three power modes: high-resolution (2.3 mW), low-power (3.4 mW), and very-low-power (1.9 mW). All maintain 24-bit resolution and identical noise performance at matched OSR/gain settings; only data rate and clock frequency scale - e.g., 64 kSPS (HR) → 32 kSPS (LP) → 16 kSPS (VLP) at fixed fCLKIN.

Can the ADS131M02IPWR measure signals below ground potential?

Yes, the ADS131M02IPWR integrates a negative charge pump that enables analog input voltages down to AGND – 1.3 V (e.g., –0.6 V at gain = 1). This allows direct measurement of bipolar current waveforms or grounded shunt configurations without level-shifting circuitry - a key feature confirmed in the ADS131M02IPWR datasheet Section 6.3.