Texas Instruments REF1930AIDDCT

Overview

REF1930AIDDCT from Texas Instruments is a dual-output, low-drift voltage reference IC providing precise 3.0 V (VREF) and 1.5 V (VBIAS = VREF/2) outputs for single-supply signal conditioning. It delivers ±0.1% initial accuracy, 25 ppm/°C max temperature drift over –40°C to 125°C, and ±20 mA output current capability. It is used in high-precision ADC biasing, current-sensing front-ends, and industrial data acquisition systems where matched dual references reduce component count and improve system-level accuracy.

For engineers reviewing the REF1930AIDDCT datasheet, REF1930AIDDCT pinout, REF1930AIDDCT application, or REF1930AIDDCT equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and parametric differences.

Technical Context

The REF1930AIDDCT integrates a band-gap core with e-Trim™ package-level trimming to achieve tight initial accuracy and low drift on both VREF and VBIAS outputs. Its dual-buffer architecture ensures independent sourcing/sinking capability (±20 mA) while maintaining 6 ppm/°C max tracking between outputs from –40°C to 85°C.

It operates from a minimum input voltage of VREF + 20 mV (3.02 V), enabling use in low-headroom battery-powered systems. The EN pin supports active-high enable logic (EN ≥ VIN – 0.7 V), reducing quiescent current from 360 µA (active) to 5 µA (shutdown), with 500 µs turn-on settling time to 0.1% under 1 µF load.

Key Specifications

Pinout & Package

SOT-23-5 (DDC) package, 2.90 mm × 1.60 mm body size, surface-mount compatible with standard reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF1930AIDDCT, REF1933AIDDCT offers higher VREF but identical architecture and compatibility, whereas ADR4530BRZ trades dual-output convenience for superior drift performance at higher cost, size, and power-making REF1930AIDDCT optimal for cost-sensitive, space-constrained dual-reference applications.

Availability

REF1930AIDDCT is available at Aetrix Electronics and suitable for industrial process controls, medical patient monitoring equipment, and portable data acquisition systems requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for REF1930AIDDCT 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 focused on analog and embedded processing technologies, serving industrial, automotive, and communications markets with high-reliability, production-ready components.

The REF19xx family was designed specifically for precision single-supply systems needing matched dual references-targeting applications like current sensing, ADC biasing, and sensor signal conditioning where VREF/VBIAS tracking and low dropout are critical.

FAQ

What is the maximum load current supported by each output of the REF1930AIDDCT?

The REF1930AIDDCT supports ±20 mA per output (VREF and VBIAS). Both outputs can simultaneously source and sink up to 20 mA while maintaining specified accuracy and thermal performance. Short-circuit current is internally limited to 50 mA, protecting the device during fault conditions. This capability enables direct driving of op-amp inputs, ADC references, and small logic loads without external buffers.

Does the REF1930AIDDCT require an external capacitor on its outputs for stability?

No, the REF1930AIDDCT is stable with output capacitive loads from 0 µF to 10 µF, including ceramic, tantalum, and electrolytic types. This eliminates mandatory external compensation and simplifies layout-especially valuable in space-constrained applications like handheld medical devices or IoT sensor nodes where board area is at a premium.

How does the EN pin function on the REF1930AIDDCT, and what happens in shutdown mode?

The EN pin is an active-high enable input. When pulled to ≥ VIN – 0.7 V, the device operates normally with 360 µA quiescent current. When pulled low (< 0.7 V), it enters shutdown mode: outputs go high-impedance, and quiescent current drops to 5 µA. This feature enables power gating in battery-operated systems-e.g., waking the REF1930AIDDCT only during ADC conversion cycles to extend runtime.

What is the significance of VREF–VBIAS tracking specification in the REF1930AIDDCT?

VREF–VBIAS tracking quantifies how closely the 1.5 V (VBIAS) output follows exactly half the 3.0 V (VREF) output across temperature. At ±7 ppm/°C max (–40°C to 125°C), the relative error stays within ±1.05 mV over full range-preserving common-mode rejection in differential circuits like current shunt monitors (e.g., paired with INA213) and eliminating calibration drift caused by mismatched external dividers.

Can the REF1930AIDDCT operate from a 3.1 V supply, and what is the minimum recommended input voltage?

Yes, the REF1930AIDDCT can operate from 3.1 V. Its minimum input voltage is VREF + 20 mV (3.02 V) at 20 mA load, per datasheet Section 7.3. At lighter loads, dropout falls to 10 mV-so 3.02 V is sufficient for most applications. Operation below 3.02 V risks output regulation loss, especially at elevated temperatures or full load, and is not recommended for production designs.