Texas Instruments ADS131M08IPBSR

Overview

ADS131M08IPBSR from Texas Instruments is an 8-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, and features integrated 1.2-V low-drift reference and channel-to-channel phase calibration - enabling high-accuracy voltage and current measurement in electricity meters and protection relays.

For engineers reviewing the ADS131M08IPBSR datasheet, ADS131M08IPBSR pinout, ADS131M08IPBSR application, or ADS131M08IPBSR equivalent, key selection considerations include simultaneous sampling integrity, input impedance ≥1 MΩ at high gains, crosstalk <–120 dB, fast 0.5-ms startup, and support for direct sensor interface without external signal conditioning.

Technical Context

The ADS131M08IPBSR implements a multi-channel delta-sigma modulator architecture with independent per-channel PGA (gains 1–128), digital filtering, and phase-shift calibration logic. Its 8 differential inputs share a common clock domain but allow individual gain, offset, and phase delay configuration to compensate for transducer mismatches.

It integrates a 1.2-V internal reference with ±0.1% accuracy and 8–20 ppm/°C drift, CRC protection on SPI data and register access, and a negative charge pump enabling inputs below ground. Power modes include high-resolution (6.0 mW), low-power (3.7 mW), and current-detect (5.8 mW) operation across –40°C to +125°C.

Key Specifications

Pinout & Package

ADS131M08IPBSR is housed in a 32-pin TQFP (PBS) package, 5.00 mm × 5.00 mm body size, with exposed thermal pad connected to AGND. Pin functions are validated per TI SBAS950B Rev B (2021).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS131M06IPBSR, the ADS131M08IPBSR adds two fully featured channels without sacrificing noise performance or power; versus AD7606C-18BSTZ, it trades raw speed for integrated metrology features, lower power, and simplified front-end design.

Availability

ADS131M08IPBSR is available at Aetrix Electronics and suitable for electricity meters, protection relays, and battery test equipment requiring stable component supply across extended temperature and long product lifecycles.

Supply support for ADS131M08IPBSR 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 ADS131M08IPBSR belongs to TI's energy metrology ADC family, designed specifically for revenue-grade electricity metering, circuit breaker monitoring, and power quality analysis - emphasizing simultaneous sampling integrity, low drift, and system-level integration.

FAQ

What is the maximum data rate supported by the ADS131M08IPBSR?

The ADS131M08IPBSR supports a maximum data rate of 32 kSPS in high-resolution mode with fCLKIN = 8.192 MHz. This rate applies to all eight channels operating simultaneously with gain = 1. At higher gains (e.g., 64 or 128), the effective usable rate may be reduced due to increased settling time and filter group delay, though the device maintains full 8-channel simultaneity at all configured rates.

Does the ADS131M08IPBSR require an external reference voltage?

No, the ADS131M08IPBSR integrates a low-drift 1.2-V internal reference with ±0.1% initial accuracy and 8–20 ppm/°C temperature drift. An external reference (1.1–1.3 V) may be applied via the REFIN pin for enhanced accuracy or system-level reference sharing, but it is not required. Note that capacitance must not be placed on REFIN if current-detect mode is used.

How does the ADS131M08IPBSR handle channel-to-channel timing skew?

Each channel in the ADS131M08IPBSR supports programmable phase delay calibration with 244-ns resolution, referenced to an 8.192-MHz clock. This allows precise alignment of sampling instants across all eight differential inputs - correcting for fixed delays introduced by sensor or PCB layout asymmetries, which is essential for accurate power factor and harmonic analysis.

What power modes does the ADS131M08IPBSR support, and what are their typical consumption levels?

The ADS131M08IPBSR offers four operational modes: high-resolution (6.0 mW at 3 V), low-power (3.7 mW), very-low-power (6.2 mW at 2 V), and current-detect (5.8 mW). Standby mode draws only 0.35 µA. All modes retain full 8-channel functionality and register state; mode selection is controlled via SPI-accessible configuration registers without requiring hardware changes.

Can the ADS131M08IPBSR interface directly with current transformers or Rogowski coils?

Yes, the ADS131M08IPBSR supports direct interface with current transformers and Rogowski coils due to its high input impedance (≥1 MΩ at gains ≥8) and integrated negative charge pump, which allows analog inputs to swing below AGND. No external instrumentation amplifier or level-shifting circuitry is needed - simplifying front-end design and improving system reliability in energy metering applications.