STMicroelectronics STEVAL-ISQ014V1

Overview

STEVAL-ISQ014V1 from STMicroelectronics is an evaluation board designed to demonstrate the TSZ121 single high-precision chopper-stabilized operational amplifier in SC70-5 package, featuring 5 µV max input offset voltage at 25 °C, rail-to-rail I/O, 400 kHz gain bandwidth, and operation from 1.8 V to 5.5 V supply. It enables rapid validation of ultra-low-offset signal conditioning in battery-powered medical and portable sensor interfaces.

For engineers reviewing the STEVAL-ISQ014V1 datasheet, STEVAL-ISQ014V1 pinout, STEVAL-ISQ014V1 application, or STEVAL-ISQ014V1 equivalent, this board provides a ready-to-use platform for evaluating TSZ121's chopper architecture, low-power precision performance (40 µA max ICC), EMI robustness (91 dB EMIRR at 2.4 GHz), and thermal stability across –40 °C to 125 °C.

Technical Context

The board implements the TSZ121 op-amp in a standard non-inverting configuration with selectable gain (1, 10, 100) via DIP switches, supporting DC-coupled and AC-coupled inputs. It integrates dual-supply and single-supply biasing options, test points for V_IN, V_OUT, and V_REF, and provisions for external compensation capacitors up to 100 pF.

Designed around the chopper-stabilized topology, the board validates key behaviors including 10 nV/°C typical input offset drift, <0.75 µV_PP 0.1–10 Hz noise, and fast 10 µs settling time to 0.1% under 100 mV_P-P step input - all measured per DS9216 Rev 11 at V_CC = 5 V, T = 25 °C.

Key Specifications

Availability

STEVAL-ISQ014V1 is available at Aetrix Electronics and suitable for medical instrumentation prototyping, portable ECG front-ends, and battery-powered sensor signal conditioning requiring stable component supply and validated chopper-amplifier performance.

Supply support for STEVAL-ISQ014V1 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, delivering silicon solutions for automotive, industrial, and consumer applications with emphasis on energy efficiency and reliability.

This evaluation board belongs to ST's ISQ (Intelligent Signal Quality) series, specifically engineered to accelerate adoption of ultra-precision analog components in low-power, high-accuracy sensing systems where offset drift and 1/f noise must be eliminated.

FAQ

What is the primary function of the STEVAL-ISQ014V1 evaluation board?

The STEVAL-ISQ014V1 is a dedicated hardware platform for evaluating the TSZ121 chopper-stabilized operational amplifier. It provides configurable gain, multiple input coupling options, and calibrated test points to validate ultra-low-offset performance (≤5 µV), rail-to-rail operation, and sub-1 µV_PP low-frequency noise in real-world signal chains - without requiring custom PCB design.

Does the board support dual-supply operation?

Yes. The STEVAL-ISQ014V1 supports both single-supply (1.8–5.5 V) and split-supply (±0.9 V to ±2.75 V) configurations. Jumper settings allow independent connection of V_CC+ and V_CC− rails, and the board includes dedicated ground-referenced test points for each supply node to facilitate accurate dual-rail measurements.

Can the board be used to measure input offset voltage drift over temperature?

Yes. The board's minimal thermal mass, exposed copper pour for thermal coupling, and accessible device pins enable direct probing of V_OUT under controlled ambient temperature sweeps. Combined with the TSZ121's specified 10–30 nV/°C drift and on-board 100× gain option, it supports practical measurement of offset variation from –40 °C to 125 °C using standard lab equipment.

Is external compensation required for stability with capacitive loads?

No external compensation is required for loads ≤100 pF, as the board includes a 0–100 pF capacitor footprint and layout-optimized routing that maintains phase margin ≥53° per DS9216. For heavier capacitive loads (>100 pF), the onboard capacitor pad allows direct soldering of a discrete ceramic capacitor to preserve stability without redesigning the board.