Overview
The REF1933AIDDCT from Texas Instruments is a low-drift, low-power, dual-output voltage reference designed for high-precision applications. This component provides a stable reference voltage (VREF) and a second voltage (VBIAS) that is half of the reference voltage. It is particularly useful in single-supply systems where an additional stable voltage is required, such as in analog-to-digital converter (ADC) input ranges to bias bipolar signals.
The REF1933AIDDCT offers excellent temperature drift performance of 25 ppm/°C (max) from -40°C to 125°C and high initial accuracy of ±0.1% (max). Both the VREF and VBIAS outputs track each other with a precision of 6 ppm/°C (max) across the temperature range of -40°C to 85°C, ensuring high precision in the signal chain.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Output Voltage Accuracy | -0.1% | 0.1% | % | |
| Temperature Drift | 25 ppm/°C | ppm/°C | ||
| Operating Temperature Range | -40°C | 125°C | °C | |
| Supply Input Voltage Range | VREF + 0.02 V | 5.5 V | V | |
| Quiescent Current | < 430 µA | µA | ||
| Load Current per Output | ±20 mA | mA | ||
| Short-Circuit Current Limit | 50 mA | mA | ||
| Dropout Voltage | 10 mV | mV |
Key Features
- Low temperature drift of 25 ppm/°C (max) from -40°C to 125°C.
- High initial accuracy of ±0.1% (max).
- Dual output: VREF and VBIAS (half of VREF).
- Both outputs track each other with a precision of 6 ppm/°C (max) across the temperature range of -40°C to 85°C.
- Low quiescent current of less than 430 µA.
- Low dropout voltage of only 10 mV, allowing operation from very low input voltages.
- Both outputs can sink and source current equally well.
- Low noise levels and excellent long-term stability.
- Shutdown mode with quiescent current reduced to 5 µA.
Applications
The REF1933AIDDCT is ideal for high-precision industrial applications, particularly in systems requiring stable reference voltages. It is suitable for:
- Analog-to-digital converters (ADCs) to bias bipolar input signals.
- Low-drift, bidirectional, single-supply, low-side current-sensing solutions.
- Battery-operated systems due to its low dropout voltage.
- Applications requiring minimal thermal hysteresis and low noise levels.
Q & A
- What is the temperature drift of the REF1933AIDDCT?
The temperature drift is 25 ppm/°C (max) from -40°C to 125°C.
- What is the initial accuracy of the REF1933AIDDCT?
The initial accuracy is ±0.1% (max).
- What are the dual outputs of the REF1933AIDDCT?
The dual outputs are VREF and VBIAS, where VBIAS is half of VREF.
- What is the quiescent current of the REF1933AIDDCT?
The quiescent current is less than 430 µA.
- How does the REF1933AIDDCT perform in terms of dropout voltage?
The REF1933AIDDCT has a low dropout voltage of only 10 mV, allowing operation from very low input voltages.
- Can the REF1933AIDDCT be used in battery-operated systems?
Yes, it is suitable for battery-operated systems due to its low dropout voltage and low quiescent current.
- What is the load current capability of the REF1933AIDDCT?
The device can deliver a load current of ±20 mA per output.
- How does the REF1933AIDDCT handle short circuits?
The device is protected from short circuits by limiting the output short-circuit current to 50 mA.
- What is the shutdown mode quiescent current of the REF1933AIDDCT?
In shutdown mode, the quiescent current reduces to 5 µA.
- What are some typical applications of the REF1933AIDDCT?
Typical applications include ADCs, low-drift current-sensing solutions, and battery-operated systems.
