Texas Instruments REF1941AIDDCR

Overview

REF1941AIDDCR from Texas Instruments is a dual-output, low-drift, low-power voltage reference IC providing precise VREF = 4.096 V and VBIAS = 2.048 V outputs for high-accuracy signal conditioning in single-supply systems. It delivers ±0.1% initial accuracy, 25 ppm/°C max temperature drift over –40°C to 125°C, and 6 ppm/°C max VREF–VBIAS tracking over –40°C to 85°C - enabling precision biasing of bipolar ADC inputs in industrial data acquisition.

For engineers reviewing the REF1941AIDDCR datasheet, REF1941AIDDCR pinout, REF1941AIDDCR application, or REF1941AIDDCR equivalent, this device is selected for its dual-rail reference capability, microsize SOT23-5 packaging, sub-10 mV dropout, ±20 mA drive strength, and guaranteed tracking performance critical in current-sensing, motor control, and medical instrumentation signal chains.

Technical Context

The REF1941AIDDCR implements a band-gap core with e-Trim™ package-level calibration to achieve simultaneous high initial accuracy and low temperature drift on both VREF and VBIAS outputs. Its functional architecture uses matched resistor dividers (R1/R2 and R3/R4) to derive VBIAS = VREF / 2 from a common band-gap voltage source, ensuring intrinsic ratio stability.

Each output features independent buffered amplifiers capable of sourcing and sinking ±20 mA, with shutdown controlled via EN pin (active-high, logic threshold VIN – 0.7 V). The device operates down to VREF + 20 mV input headroom and maintains load regulation of 8 ppm/mA across full temperature range.

Key Specifications

Pinout & Package

SOT23-5 (DDC) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads, JEDEC MO-178AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6190AESA+ and ADR4540BRZ, REF1941AIDDCR uniquely integrates matched VREF/VBIAS outputs with tracking, micro SOT23-5 size, and shutdown capability - eliminating discrete components while maintaining <16-bit system accuracy across temperature in space-constrained designs.

Availability

REF1941AIDDCR is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, data acquisition systems, and motor control feedback requiring stable component supply with guaranteed long-term availability.

Supply support for REF1941AIDDCR 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 ICs and industrial-grade reference solutions.

The REF19xx family was designed specifically for high-accuracy, single-supply signal chains - delivering dual-rail references with matched drift and low power to replace discrete bias networks in data converters, current sensors, and medical front-ends.

FAQ

What is the exact output voltage specification for REF1941AIDDCR?

The REF1941AIDDCR provides two precisely trimmed outputs: VREF = 4.096 V ±0.1% and VBIAS = 2.048 V ±0.1%, both specified at TA = 25°C with IL = 0 mA and VIN = 5 V. These values are guaranteed across the full operating temperature range (–40°C to 125°C) and form the basis for its use in 12-bit and higher-resolution ADC systems.

How does REF1941AIDDCR achieve VREF–VBIAS tracking performance?

The REF1941AIDDCR derives VBIAS = VREF / 2 using matched internal resistor dividers (R1/R2 and R3/R4) fed from a common band-gap voltage source. Combined with e-Trim™ package-level calibration, this architecture ensures VREF–VBIAS tracking of ≤6 ppm/°C over –40°C to 85°C - critical for maintaining accuracy in differential signal paths like those used with the INA213 current-sense amplifier.

What is the minimum input voltage required for REF1941AIDDCR to regulate properly?

The REF1941AIDDCR requires a minimum input voltage of VREF + 20 mV (i.e., 4.116 V) under full load (20 mA) at 25°C, per recommended operating conditions. At no load, the minimum is VREF + 20 mV; at 20 mA, dropout rises to 600 mV worst-case, but typical dropout remains ≤10 mV - enabling reliable operation from low-headroom supplies such as 4.2-V Li-ion batteries or post-LDO rails.

Can REF1941AIDDCR drive a 10-kΩ ADC reference input directly?

Yes - REF1941AIDDCR can directly drive a 10-kΩ ADC reference input. With a maximum load regulation of 8 ppm/mA and ±20 mA output capability, it introduces ≤80 ppm error at 10 mA load. For a 4.096-V reference, that equals ±0.33 mV error - well within the LSB of a 14-bit ADC (0.25 mV) and acceptable for most 16-bit implementations with system calibration.

Does REF1941AIDDCR support shutdown mode, and what is its quiescent current in that state?

Yes - REF1941AIDDCR supports active-high enable control via the EN pin. When EN is pulled low (≤0.7 V), the device enters shutdown mode, disabling both outputs and reducing quiescent current to 5 µA maximum over –40°C to 125°C. This feature enables power-gating in battery-operated DAQ modules and portable medical devices to extend operational life between charges.