STMicroelectronics EVALST-ISOSD61L

Overview

EVALST-ISOSD61L from STMicroelectronics is a dedicated evaluation board for the ISOSD61L galvanically isolated 1-bit sigma-delta modulator, enabling full characterization of its 16-bit no-missing-codes A/D conversion capability, ±320 mV differential input range, and 6 kV isolation barrier under up to 25 MHz external clock operation.

For engineers reviewing the EVALST-ISOSD61L datasheet, EVALST-ISOSD61L pinout, EVALST-ISOSD61L application, or EVALST-ISOSD61L equivalent, this board supports rapid validation of isolated current sensing in motor drives, industrial power supplies, and energy metering systems using coaxial or header-based signal access and on-board LVDS termination.

Technical Context

The EVALST-ISOSD61L implements direct interface support for the ISOSD61L's LVDS digital output with integrated 100 Ω termination resistors, eliminating external termination requirements. It provides dual-access I/O paths-coaxial connectors for high-fidelity analog input routing and header pins for flexible digital output probing and filter integration.

Designed for extended temperature operation (–40°C to +125°C), the board accommodates shunt-based current sensing via dedicated solder pads and maintains signal integrity through controlled impedance layout, supporting SNR of 86 dB and effective bandwidth of 49 kHz when paired with an external digital decimation filter.

Key Specifications

Availability

EVALST-ISOSD61L is available at Aetrix Electronics and suitable for motor drive commissioning, industrial power supply monitoring, and smart energy meter development requiring stable component supply and validated reference hardware.

Supply support for EVALST-ISOSD61L 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management solutions with broad analog, microcontroller, and sensor portfolios.

This evaluation board belongs to ST's Isolated Sensing Solutions product line, engineered to accelerate design-in of high-accuracy, high-isolation current and voltage measurement subsystems in safety-critical power conversion applications.

FAQ

Does EVALST-ISOSD61L include the ISOSD61L device?

Yes - the board is populated with a production-grade ISOSD61L isolated sigma-delta modulator. It is not a blank carrier; the device is soldered and fully functional out-of-box, ready for immediate evaluation with external clock and digital filter resources.

What digital filter is required to achieve 16-bit resolution?

A third-order sinc filter (e.g., sinc³) is required to decimate the ISOSD61L's 1-bit LVDS bitstream into a 16-bit word. The board does not include digital filtering; users must implement it externally in FPGA, MCU, or ASIC logic synchronized to the 25 MHz clock input.

Can EVALST-ISOSD61L be used for voltage sensing instead of current sensing?

Yes - while optimized for shunt-based current sensing via the provided pads, the ±320 mV differential input accepts any low-level differential signal. Voltage sensing requires appropriate front-end scaling (e.g., resistive divider + isolation amplifier) to stay within the input range and maintain common-mode rejection.

Is the 6 kV isolation rating verified on the evaluation board?

The 6 kV_PEAK rating applies to the ISOSD61L IC itself per IEC 60747-17. The EVALST-ISOSD61L board maintains creepage/clearance compliant with reinforced isolation requirements, but system-level 6 kV testing must be performed on the final end-equipment layout per IEC 61800-5-1 or IEC 62109.