Texas Instruments REF6250IDGKR

Overview

REF6250IDGKR from Texas Instruments is a high-precision, 5-V voltage reference with integrated ADC drive buffer, designed to directly drive the REF pin of SAR and delta-sigma ADCs such as the ADS8881 and ADS127L01. It delivers ±0.05% initial accuracy, 3 ppm/°C max temperature drift (0°C to +70°C), <50 mΩ output impedance (DC–200 kHz), and supports first-sample precision to 18 bits in burst-mode data acquisition systems.

For engineers reviewing the REF6250IDGKR datasheet, REF6250IDGKR pinout, REF6250IDGKR application, or REF6250IDGKR equivalent, this page provides verified specifications, functional pin roles, real-world droop performance with ADS8881 at 1 MSPS, noise and distortion metrics (SNR = 100.5 dB, THD = –125.9 dB), and validated alternative options for precision reference design.

Technical Context

The REF6250IDGKR integrates a low-drift bandgap core with a unity-gain, low-output-impedance buffer optimized for dynamic ADC reference loads. Its dual-ground architecture (GND_F/GND_S) separates force and sense paths to minimize PCB layout-induced errors, while the SS pin enables programmable short-circuit current limiting (10.5 mA typical).

It operates from a 5.3–5.5 V input supply, supports ±3 mA output current, and maintains stability with 10–47 µF capacitive loads. The FILT pin requires ≥1 µF to CFILT for loop compensation, and its turn-on settling time is 100 ms to 0.1% with CL = 47 µF - critical for event-triggered acquisition where first-conversion accuracy is non-negotiable.

Key Specifications

Pinout & Package

REF6250IDGKR is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm body size), optimized for space-constrained precision signal chains. Thermal resistance R_θJA = 158.5°C/W supports operation up to +70°C ambient without forced airflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF6245IDGKR and REF6233IDGKR, REF6250IDGKR uniquely delivers 5.000 V output with matched headroom for 5-V ADCs, ensuring optimal SNR and linearity without external scaling - making it the only valid choice for ADS8881-based 18-bit DAQ at full throughput.

Availability

REF6250IDGKR is available at Aetrix Electronics and suitable for ATE testers and oscilloscopes, test and measurement equipment, and analog input modules for PLCs requiring stable component supply, long-term calibration integrity, and guaranteed first-sample precision in burst-mode acquisition.

Supply support for REF6250IDGKR 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 leader specializing in analog and embedded processing technologies, with decades of expertise in precision voltage references and data converter ecosystems.

The REF62xx family was engineered specifically to solve dynamic reference droop in high-resolution SAR and delta-sigma ADCs - REF6250IDGKR targets 5-V, 18-bit, 1-MSPS data acquisition systems demanding zero-trim, low-drift, and integrated buffer performance.

FAQ

What is the maximum load current supported by REF6250IDGKR?

REF6250IDGKR supports ±3 mA continuous output current. This is confirmed in Section 7.3 (Recommended Operating Conditions) of the SBOS748 datasheet, where IL = 0 mA to 3 mA is specified for sourcing and sinking. Exceeding this may degrade accuracy or trigger short-circuit protection via the SS pin.

Does REF6250IDGKR require an external filter capacitor on the FILT pin?

Yes - REF6250IDGKR requires a minimum 1 µF capacitor connected between the FILT pin and GND_F. This is explicitly mandated in the Pin Functions table (Section 6) and Figure 45 schematic. Omitting CFILT risks instability and oscillation due to insufficient phase margin in the internal compensation loop.

Can REF6250IDGKR drive the REF pin of ADS8881 with 18-bit accuracy on the first sample?

Yes - REF6250IDGKR is verified to achieve <1 LSB droop at 1 MSPS when driving the ADS8881 REF pin, as shown in Figures 31–33 and Section 8.3. This is enabled by its <50 mΩ output impedance and integrated buffer, guaranteeing first-sample precision without external circuitry.

What is the temperature range over which REF6250IDGKR maintains 3 ppm/°C drift?

REF6250IDGKR guarantees ≤3 ppm/°C temperature coefficient over 0°C to +70°C, per the Device Comparison Table (Section 5) and Electrical Characteristics (Section 7.5). This specification does not extend to –40°C or +125°C - those ranges apply only to other REF60xx/REF61xx families.

How does the dual-ground (GND_F/GND_S) architecture improve performance in REF6250IDGKR?

The GND_F and GND_S separation in REF6250IDGKR enables true Kelvin sensing: GND_F carries output current return, while GND_S serves as the quiet reference for the internal bandgap and OUT_S feedback. This reduces errors from PCB trace resistance and improves thermal hysteresis (≤33 ppm) and long-term stability (80 ppm/1000 h).