ProtoCentral ADS1262 32-bit Precision ADC Breakout Board v4

New in v4: one supply pin for both 3.3 V and 5 V hosts. An on-board charge pump now generates the clean 5 V analog rail the ADS1262 needs, so a battery-powered ESP32 or Pico can drive it directly. Five wires get you to a first reading, and a 6.2 V Zener clamps the analog rail if it is ever back-driven.

The ProtoCentral ADS1262 breakout puts the Texas Instruments ADS1262 on a breadboard-friendly board. The ADS1262 is a 32-bit delta-sigma ADC with a low-noise PGA, a 2.5 V internal reference, sensor-excitation current sources and a programmable digital filter. Wire a load cell, strain gauge, RTD or thermocouple straight to its inputs, with no external signal conditioning.

Power, simplified: the ADS1262’s analog supply must be 4.75–5.25 V. There is no 3.3 V analog mode. v4 generates that rail on board with a TI LM2775 regulated charge pump running at a fixed 2 MHz. The charge pump is followed by a two-stage LC filter built from shielded inductors. The digital side runs from the same pin through a ferrite, so the I/O level always matches your host with no level translators. Connect VCC to your host’s 3.3 V or 5 V rail and you’re done.

Five wires to a first reading: START and RST/PWDN have on-board pull-ups, so SCK, MOSI, MISO, CSB and DRDY (plus VCC and GND) are all you need. START, RST/PWDN and the CLKIN external-clock input stay on the header for when you want them.

Getting started: install the ProtoCentral ADS1262 Arduino library and run an example. Measuring a ground-referenced 0–5 V signal? Bypass the PGA. With the PGA enabled, its input range limits single-ended readings.

Features

• TI ADS1262 32-bit ΔΣ ADC, 2.5 SPS to 38400 SPS
• 10 analog inputs plus AINCOM: 10 single-ended or 5 differential channels
• Low-noise PGA, 2.5 V internal reference, two sensor-excitation current sources (IDACs)
• Single supply pin for 3.3 V or 5 V hosts; 5.0 V AVDD made on board by an LM2775 charge pump with a two-stage LC filter
• Digital I/O follows the host logic level; no level translators needed
• On-board pull-ups on START and RST/PWDN: five signal wires to a first reading
• 6.2 V Zener clamp on the 5 V analog rail
• External clock input with an on-board selection jumper
• AVSS brought out to the analog header
• Four plated M2 mounting holes
• Open-source hardware (CERN-OHL-P v2) with an MIT-licensed Arduino library

Applications

• Weigh scales, load cells and strain gauges
• RTD (PT100 / PT1000) and thermocouple temperature measurement
• Precision voltage measurement and multi-channel data acquisition

Specifications

• ADC: TI ADS1262, 32-bit ΔΣ
• Supply (VCC pin): 2.7–5.25 V (use your host’s 3.3 V or 5 V rail)
• Analog supply: 5.0 V generated on board (LM2775, fixed 2 MHz, two-stage LC filter)
• Interface: SPI
• Analog header (12-pin, 0.1″): AIN0–AIN9, AINCOM, AVSS (header strip included, unsoldered)
• Host header (10-pin, 0.1″): VCC, GND, SCK, MOSI, MISO, DRDY, CSB, RST/PWDN, START, CLKIN (pre-soldered)
• Board: 32.1 × 37.3 mm, 2-layer