Overview
The REF191ES from Analog Devices Inc. is a precision micropower, low dropout voltage reference. This device is part of the REF19x series, which utilizes a patented temperature drift curvature correction circuit and laser trimming of highly stable, thin-film resistors to achieve a very low temperature coefficient and high initial accuracy. The REF191ES is designed to provide a stable output voltage from supplies as low as 100 mV above the output voltage, making it suitable for a variety of applications requiring precise voltage referencing.
Key Specifications
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Initial Accuracy | VO | IOUT = 0 mA | 2.046 | 2.048 | 2.050 | V |
| Line Regulation | ΔVO/ΔVIN | 3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA | 2 | 4 | ppm/V | |
| Load Regulation | ΔVO/ΔILOAD | VS = 5.0 V, 0 mA ≤ IOUT ≤ 20 mA | 4 | 10 | ppm/mA | |
| Dropout Voltage | VS - VO | VS = 3.5 V, ILOAD = 10 mA | 1.00 | V | ||
| Supply Current | ISUPPLY | No load | 45 | μA | ||
| Sleep Mode Current | ISLEEP | No load | 15 | μA | ||
| Output Current | IOUT | 30 | mA | |||
| Temperature Coefficient | TCVO | IOUT = 0 mA | 2 | 5 | ppm/°C | |
| Operating Temperature | TA | -40 | 85 | °C | ||
| Package | 8-SOIC (0.154", 3.90mm Width) |
Key Features
- Precision micropower, low dropout voltage reference.
- High output current: up to 30 mA.
- Low supply current: maximum 45 μA, and 15 μA in sleep mode.
- High initial accuracy: ±2 mV maximum.
- Low temperature coefficient: 2 ppm/°C to 5 ppm/°C.
- Short-circuit protection.
- Extended industrial temperature range: -40°C to +85°C.
- Low dropout voltage and load regulation.
Applications
- Portable instruments.
- ADCs and DACs.
- Smart sensors.
- Solar powered applications.
- Loop-current-powered instruments.
Q & A
- What is the REF191ES from Analog Devices Inc.? The REF191ES is a precision micropower, low dropout voltage reference.
- What is the typical supply current of the REF191ES? The typical supply current is 45 μA, and 15 μA in sleep mode.
- What is the maximum output current of the REF191ES? The maximum output current is 30 mA.
- What is the temperature coefficient of the REF191ES? The temperature coefficient is 2 ppm/°C to 5 ppm/°C.
- What is the operating temperature range of the REF191ES? The operating temperature range is -40°C to +85°C.
- What package types are available for the REF191ES? The REF191ES is available in an 8-SOIC package.
- Does the REF191ES have short-circuit protection? Yes, the REF191ES has short-circuit protection.
- What are some common applications of the REF191ES? Common applications include portable instruments, ADCs and DACs, smart sensors, solar powered applications, and loop-current-powered instruments.
- Is a capacitor required for proper operation of the REF191ES? Yes, a 1 μF capacitor is required between the output pin and the GND pin of the device.
- What is the initial accuracy of the REF191ES? The initial accuracy is ±2 mV maximum.
