Texas Instruments REF6241IDGKT

Overview

REF6241IDGKT from Texas Instruments is a high-precision voltage reference with integrated ADC drive buffer, delivering 4.096 V output, ±0.05% initial accuracy, 3 ppm/°C max temperature drift (0°C to +70°C), <50 mΩ output impedance (DC–200 kHz), and verified first-sample 18-bit precision when driving the REF pin of ADS8881 SAR ADCs in burst-mode data acquisition systems.

For engineers reviewing the REF6241IDGKT datasheet, REF6241IDGKT pinout, REF6241IDGKT application, or REF6241IDGKT equivalent, this device addresses critical timing stability, low-noise reference droop, and dynamic load handling in precision analog front-ends for test equipment and industrial DAQ.

Technical Context

The REF6241IDGKT integrates a bandgap voltage reference core with a low-output-impedance buffer optimized for transient current demands of SAR ADC reference pins-specifically enabling sub-1-LSB (19.07 µV) droop at 1 MSPS with ADS8881. Its dual-ground architecture (GND_F/GND_S) separates force and sense paths to minimize PCB layout-induced errors.

It features programmable short-circuit current via SS pin, FILT pin for ≥1 µF stabilization capacitor, and EN-controlled shutdown drawing only 1 µA. The device operates from VIN ≥ VOUT + 0.25 V (min 4.346 V) up to 5.5 V, supporting precision systems where supply headroom is constrained.

Key Specifications

Pinout & Package

REF6241IDGKT is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm body size) with exposed thermal pad (DGK suffix), optimized for low-inductance ground return and thermal dissipation in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF6245IDGKT and REF5040AIDR, REF6241IDGKT uniquely combines 4.096 V output, integrated buffer, sub-1-LSB droop, and 5 µV_RMS noise-making it the only single-chip solution for first-sample-accurate 18-bit DAQ at 1 MSPS without design compromises.

Availability

REF6241IDGKT is available at Aetrix Electronics and suitable for ATE testers, PLC analog input modules, portable medical devices, and precision data acquisition systems requiring stable component supply, long-term calibration integrity, and guaranteed 18-bit first-sample accuracy.

Supply support for REF6241IDGKT 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 data converter ecosystems.

The REF62xx family was designed specifically to solve dynamic reference loading challenges in high-resolution SAR and delta-sigma ADC systems-enabling burst-mode, event-triggered, and multiplexed DAQ architectures without external buffering.

FAQ

What is the output voltage tolerance and temperature coefficient of REF6241IDGKT?

The REF6241IDGKT has a nominal output voltage of 4.096 V with ±0.05% initial accuracy at 25°C and a maximum temperature coefficient of 3 ppm/°C over the 0°C to +70°C operating range. These specifications are guaranteed for both the reference core and integrated buffer combined, ensuring end-to-end stability without additional calibration.

How does REF6241IDGKT achieve first-sample 18-bit precision with ADS8881?

REF6241IDGKT achieves first-sample 18-bit precision by combining ultra-low output impedance (<50 mΩ up to 200 kHz) with optimized transient response, limiting reference droop to <1 LSB (19.07 µV) at 1 MSPS when driving the ADS8881 REF pin. This is validated in TI's SBOS748 datasheet Figure 38 and confirmed under real burst-mode acquisition conditions.

What are the minimum and maximum supply voltage requirements for REF6241IDGKT?

REF6241IDGKT requires a minimum supply voltage of VOUT + 0.25 V = 4.346 V and supports up to 5.5 V. At 25°C, line regulation is 4–20 ppm/V; operation below 4.346 V risks dropout and degraded accuracy, while exceeding 5.5 V violates absolute maximum ratings and may cause permanent damage.

Can REF6241IDGKT drive multiple ADC reference inputs simultaneously?

REF6241IDGKT can drive multiple ADC REF pins only if total load current remains within ±4 mA and PCB layout maintains tight Kelvin connections (separate OUT_F/GND_F paths per ADC). For >2 ADCs or higher current demand, use individual REF6241IDGKT per ADC or add external buffer-TI does not characterize multi-load droop or crosstalk.

What is the purpose of the FILT and SS pins on REF6241IDGKT?

The FILT pin requires a ≥1 µF capacitor to ground (GND_F) to stabilize internal compensation and prevent oscillation under capacitive loads. The SS pin sets short-circuit current limit via external resistor; left open, it defaults to ~10.5 mA-protecting the device during REF pin faults without sacrificing normal ±4 mA operation.