Texas Instruments REF7025QDGKR

Overview

REF7025QDGKR from Texas Instruments is a precision 2.5 V series voltage reference IC designed for high-resolution signal chains in test and measurement, medical imaging, and industrial instrumentation. It delivers ±0.025% initial accuracy, 2 ppm/°C max temperature drift over −40°C to +125°C, 0.23 ppmp-p (0.1–10 Hz) low-frequency noise, and supports ±10 mA output current with 400 mV dropout at full load.

For engineers reviewing the REF7025QDGKR datasheet, REF7025QDGKR pinout, REF7025QDGKR application, or REF7025QDGKR equivalent, this page provides verified specifications, LCCC vs VSSOP package distinctions, noise-sensitive design guidance, long-term stability data, and validated alternative options for precision analog systems requiring sub-ppm stability and ultra-low 1/f noise.

Technical Context

The REF7025QDGKR implements a bandgap-based series reference architecture with integrated enable control, dual-output force/sense topology (OUTF/OUTS), and internal compensation optimized for 1–100 µF low-ESR capacitors. Its low-noise design minimizes contribution to ADC quantization error in 24-bit+ data acquisition systems.

It operates across 2.75 V to 18 V input, maintains regulation under ±10 mA load, achieves 107 dB PSRR at 1 kHz, and features shutdown mode with <12 µA quiescent current. The DGK package (VSSOP-8) enables compact PCB layouts but exhibits higher thermal hysteresis (290 ppm) and long-term drift (75 ppm/1k hr) than the hermetic LCCC variant.

Key Specifications

Pinout & Package

REF7025QDGKR uses an 8-pin VSSOP (DGK) package - 3.00 mm × 3.00 mm, surface-mount, thermally enhanced plastic body. This package supports automated assembly and offers lower cost than LCCC, with trade-offs in long-term stability and thermal hysteresis.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar precision voltage reference applications.

Compared with REF7025QFKHT, REF7025QDGKR trades hermetic stability for smaller size and lower cost - ideal for volume industrial systems. Against ADR4525BRZ, it adds EN control and force/sense architecture for higher-accuracy distributed loads, at the expense of pin count and layout complexity.

Availability

REF7025QDGKR is available at Aetrix Electronics and suitable for semiconductor test equipment, precision data acquisition systems, and industrial PLC analog I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for REF7025QDGKR 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 analog signal chains and power management ICs.

The REF70 family was developed to address the growing demand for ultra-low-noise, low-drift voltage references in high-resolution data converters used in test & measurement, medical imaging, and industrial automation.

FAQ

What is the maximum operating temperature for REF7025QDGKR?

The REF7025QDGKR is specified for continuous operation from −40°C to +125°C ambient temperature. This wide range supports deployment in demanding industrial environments such as motor control cabinets and outdoor field transmitters, where ambient temperatures exceed 85°C. Thermal derating is not required within this range, and all key parameters - including 2 ppm/°C drift and 0.23 ppmp-p noise - are guaranteed across the full span.

Does REF7025QDGKR require an external capacitor on the output?

Yes, REF7025QDGKR requires an external output capacitor between 1 µF and 100 µF with ESR from 1 mΩ to 400 mΩ for stability. Unlike older references needing precise ESR tuning, this wide capacitor range simplifies BOM management and allows use of standard low-ESR tantalum or polymer capacitors. The OUTF/OUTS dual-output configuration enables remote sensing to maintain regulation accuracy even with PCB trace resistance.

How does the EN pin function on REF7025QDGKR?

The EN pin on REF7025QDGKR is an active-high enable input. Driving it above 1.6 V enables the reference output; pulling it below 0.5 V disables the output and places the device in shutdown mode, reducing quiescent current to ≤12 µA. If left unconnected, the internal pull-up resistor automatically enables the device - eliminating the need for external biasing in simple applications while retaining flexibility for power-gated systems.

What is the dropout voltage specification for REF7025QDGKR at full load?

REF7025QDGKR has a dropout voltage of 400 mV at ±10 mA output current and −40°C to +125°C. At 5 mA, dropout drops to 250 mV. This low dropout enables operation from supplies as low as 2.9 V, making REF7025QDGKR suitable for battery-backed or energy-harvesting systems where headroom is constrained - unlike legacy references requiring ≥1 V overhead.

Can REF7025QDGKR be used with 24-bit delta-sigma ADCs like ADS127L01?

Yes, REF7025QDGKR is explicitly designed for use with high-resolution delta-sigma ADCs including the ADS127L01. Its 0.23 ppmp-p (0.1–10 Hz) 1/f noise, 2 ppm/°C drift, and ±0.025% initial accuracy directly align with the noise floor and linearity requirements of 24-bit+ converters. TI's signal chain documentation confirms REF7025QDGKR as a recommended reference for ADS127L01 in precision data acquisition reference designs.