Texas Instruments ADS125H02IRHBR

Overview

ADS125H02IRHBR from Texas Instruments is a ±20-V input, 24-bit delta-sigma analog-to-digital converter with integrated PGA (gain 0.125–128), 2.5-V reference (3 ppm/°C drift), and dual-channel differential input (AIN0/AIN1). It delivers 45 nV_RMS noise at 20 SPS, 105 dB CMRR, and operates from –40°C to +125°C in industrial PLC analog input modules.

For engineers reviewing the ADS125H02IRHBR datasheet, ADS125H02IRHBR pinout, ADS125H02IRHBR application, or ADS125H02IRHBR equivalent, this page provides verified technical context, validated pin functions, real-world use cases for high-voltage sensor interfacing, and confirmed alternative parts with documented functional and application differences.

Technical Context

The ADS125H02IRHBR integrates a high-voltage PGA (±15.5 V common-mode, 1 GΩ input impedance) and a 24-bit delta-sigma ADC with sinc-based digital filtering optimized for 50/60 Hz line-cycle rejection at ≤50/60 SPS. Its architecture supports no-latency conversion during channel sequencing via configurable filter modes (sinc1/sinc3/sinc4/sinc5).

It features dual independent excitation current sources (50–3000 µA), four GPIOs for external multiplexer control, and built-in signal/reference voltage monitors with programmable thresholds. The internal 2.5-V reference and 2.5% max oscillator accuracy enable self-contained operation without external timing or reference components.

Key Specifications

Pinout & Package

ADS125H02IRHBR is housed in a 5-mm × 5-mm, 32-pin VQFN package (RHB) with exposed thermal pad connected to DGND. Pin functions are electrically validated per TI SBAS790C Rev C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage, high-precision ADC applications.

Compared with ADS131M02IPWR and AD7177-2BRUZ, the ADS125H02IRHBR uniquely combines ±20 V input tolerance, integrated high-voltage PGA, on-chip 2.5-V reference, and diagnostic monitors - making it the only single-chip solution for space-constrained, high-CMRR industrial analog input modules requiring operation beyond ±10 V.

Availability

ADS125H02IRHBR is available at Aetrix Electronics and suitable for industrial PLC analog input modules, battery management systems, high-side current sensing, and RTD temperature transmitters requiring stable component supply across extended temperature and voltage ranges.

Supply support for ADS125H02IRHBR 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 company specializing in analog and embedded processing technologies, with leadership in precision data converters and industrial interface solutions.

The ADS125H02IRHBR belongs to TI's high-voltage precision ADC product line, designed specifically for industrial automation systems requiring direct ±20 V signal acquisition, robust EMC performance, and extended temperature operation without external support components.

FAQ

What is the maximum common-mode input voltage supported by the ADS125H02IRHBR?

The ADS125H02IRHBR supports a common-mode input voltage up to ±15.5 V, enabling direct interfacing with high-side shunt measurements and industrial voltage signals without external level-shifting circuitry. This specification is guaranteed under recommended operating conditions with HV_AVDD = ±15 V and applies to both AIN0 and AIN1 inputs referenced to AINCOM. The ADS125H02IRHBR maintains 105 dB CMRR at 60 Hz within this range.

Does the ADS125H02IRHBR require an external clock source?

No, the ADS125H02IRHBR includes an internal oscillator with ±2.5% accuracy (±3.5% at 40 kSPS), eliminating the need for an external crystal or clock generator. When CLKIN is tied to DGND, the device automatically uses the internal oscillator. An external clock (1–10.75 MHz) may be applied to CLKIN for improved timing stability in synchronization-critical applications, but it is not required for basic operation. The ADS125H02IRHBR supports both modes without firmware changes.

How does the ADS125H02IRHBR handle 50 Hz and 60 Hz line interference?

The ADS125H02IRHBR uses a configurable sinc-based digital filter that provides ≥95 dB rejection of 50 Hz and 60 Hz normal-mode noise at data rates ≤50 SPS or ≤60 SPS. At higher rates (e.g., 40 kSPS), the filter bandwidth increases, reducing line-frequency rejection but enabling high-speed channel scanning. The ADS125H02IRHBR achieves this without external notch filters or software post-processing, delivering clean measurements in electrically noisy factory environments.

Can the ADS125H02IRHBR measure both voltage and current inputs simultaneously?

Yes, the ADS125H02IRHBR supports simultaneous voltage and current measurement via its two differential input channels (AIN0/AIN1) and dual programmable current sources (IDAC1/IDAC2). For example, AIN0 can digitize a ±10 V control signal while IDAC1 excites an RTD on AIN1 - all within one device. The ADS125H02IRHBR's independent GPIOs (GPIO0–GPIO3) allow external multiplexer control to expand channel count without adding ADCs.

What is the purpose of the REFP1/GPIO0 and REFN1/GPIO1 pins on the ADS125H02IRHBR?

REFP1/GPIO0 and REFN1/GPIO1 are multifunction pins that serve as either secondary reference inputs (for differential reference configurations) or general-purpose digital I/Os. When used as GPIOs, they provide additional control lines for external analog switches or status indicators. When configured as reference inputs, they enable ratiometric measurements with separate reference paths - enhancing accuracy in systems with long sensor cables or varying reference loads. This dual functionality is managed via the ADS125H02IRHBR's register map and requires no hardware modification.