Overview
The REF194ESZ, produced by Analog Devices Inc., is part of the REF19x series of precision band gap voltage references. These devices are designed to provide high initial accuracy and a very low temperature coefficient, achieved through a patented temperature drift curvature correction circuit and laser trimming of highly stable, thin-film resistors. The REF194ESZ is a micropower, low dropout voltage (LDV) device, capable of operating from supplies as low as 100 mV above the output voltage while consuming less than 45 μA of supply current. It also features a sleep mode that further reduces the supply current to less than 15 μA when enabled by a low TTL or CMOS level on the SLEEP pin.
Key Specifications
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Initial Accuracy | VO | E Grade, IOUT = 0 mA | 4.498 | 4.5 | 4.502 | V |
| G Grade, IOUT = 0 mA | 4.490 | 4.510 | V | |||
| Line Regulation | ΔVO/ΔVIN | E Grade, 4.75 V ≤ VS ≤ 15 V, IOUT = 0 mA | 2 | 4 | ppm/V | |
| G Grade, 4.75 V ≤ VS ≤ 15 V, IOUT = 0 mA | 4 | 8 | ppm/V | |||
| Load Regulation | ΔVO/ΔVLOAD | E Grade, VS = 5.8 V, 0 mA ≤ IOUT ≤ 30 mA | 2 | 4 | ppm/mA | |
| G Grade, VS = 5.8 V, 0 mA ≤ IOUT ≤ 30 mA | 4 | 8 | ppm/mA | |||
| Dropout Voltage | VS - VO | VS = 5.0 V, ILOAD = 10 mA | 0.50 | V | ||
| VS = 5.8 V, ILOAD = 30 mA | 1.30 | V | ||||
| Temperature Coefficient | TCVO/°C | E Grade, IOUT = 0 mA | 2 | 5 | ppm/°C | |
| G Grade, IOUT = 0 mA | 10 | 25 | ppm/°C | |||
| Supply Current | IS | Active mode | 45 | μA | ||
| Sleep mode | 15 | μA | ||||
| Output Current | IOUT | 30 | mA | |||
| Operating Temperature Range | TA | -40 | 85 | °C |
Key Features
- Precision Voltage Reference: High initial accuracy with ±2 mV maximum for the REF194ESZ, achieved through patented temperature drift curvature correction and laser trimming of thin-film resistors.
- Low Dropout Voltage: Stable output voltage from supplies as low as 100 mV above the output voltage.
- Micropower Consumption: Less than 45 μA of supply current in active mode and less than 15 μA in sleep mode.
- Low Temperature Coefficient: Very low temperature coefficient, ensuring stable output voltage across a wide temperature range.
- Short-Circuit Protection: Built-in protection against short-circuit conditions.
- Extended Industrial Temperature Range: Specified over -40°C to +85°C with typical performance up to +125°C.
- Compact Packaging: Available in an 8-lead SOIC package.
Applications
- Portable Instruments: Ideal for battery-powered devices due to low power consumption.
- ADCs and DACs: Provides stable reference voltage for analog-to-digital and digital-to-analog converters.
- Smart Sensors: Suitable for sensor applications requiring high accuracy and low power.
- Solar Powered Applications: Efficient operation from low voltage supplies.
- Loop-Current-Powered Instruments: Compatible with loop-powered devices in industrial automation.
- Automotive Applications: Meets the extended industrial temperature range requirements for automotive use.
Q & A
- What is the initial accuracy of the REF194ESZ?
The initial accuracy of the REF194ESZ is ±2 mV maximum for the E grade and ±10 mV maximum for the G grade. - What is the typical supply current of the REF194ESZ in active mode?
The typical supply current in active mode is less than 45 μA. - How does the sleep mode affect the supply current?
In sleep mode, the supply current is reduced to less than 15 μA. - What is the minimum supply voltage required for the REF194ESZ to operate?
The REF194ESZ can operate from supplies as low as 100 mV above the output voltage. - What is the maximum output current of the REF194ESZ?
The maximum output current is 30 mA. - What is the operating temperature range of the REF194ESZ?
The operating temperature range is -40°C to +85°C, with typical performance up to +125°C. - What type of packaging is available for the REF194ESZ?
The REF194ESZ is available in an 8-lead SOIC package. - Does the REF194ESZ have built-in short-circuit protection?
Yes, the REF194ESZ has built-in short-circuit protection. - What are some common applications of the REF194ESZ?
Common applications include portable instruments, ADCs and DACs, smart sensors, solar powered applications, and loop-current-powered instruments. - How does the temperature coefficient affect the REF194ESZ's performance?
The REF194ESZ has a very low temperature coefficient, ensuring stable output voltage across a wide temperature range.
