Overview
The REF191ES-REEL, produced by Analog Devices Inc., is a precision micropower, low dropout voltage reference from the REF19x series. This device is designed to provide a highly stable output voltage with minimal power consumption. It 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-REEL operates over an extended industrial temperature range of −40°C to +85°C, making it suitable for various applications including automotive, portable instruments, and smart sensors.
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 | 10 | - | 10 ppm/mA | |
| Dropout Voltage | VS - VO | VS = 3.3 V, ILOAD = 10 mA | - | - | 1.25 V | |
| Supply Current | IS | No load | - | 45 | 45 μA | |
| Sleep Mode Current | IS | No load | - | 15 | 15 μA | |
| Operating Temperature Range | TA | - | -40 | - | +85°C |
Key Features
- Precision Output Voltage: The REF191ES-REEL offers high initial accuracy with a maximum deviation of ±2 mV.
- Low Supply Current: It consumes less than 45 μA of supply current and reduces to less than 15 μA in sleep mode.
- Low Dropout Voltage: The device can operate with a supply voltage as low as 100 mV above the output voltage.
- Temperature Stability: It features a low temperature coefficient of 5 ppm/°C maximum.
- Short-Circuit Protection: The device includes short-circuit protection for enhanced reliability.
- Extended Temperature Range: Operates over an extended industrial temperature range of −40°C to +85°C.
Applications
- Portable Instruments: Ideal for battery-powered devices due to its low power consumption.
- ADCs and DACs: Used in analog-to-digital and digital-to-analog converters for precise voltage referencing.
- Smart Sensors: Suitable for sensor applications requiring stable and accurate voltage references.
- Solar Powered Applications: Efficient for use in solar-powered systems where low power consumption is crucial.
- Loop-Current-Powered Instruments: Applicable in instruments powered by loop currents.
- Automotive: Meets the requirements for automotive applications with its extended temperature range and high reliability.
Q & A
- What is the initial accuracy of the REF191ES-REEL?
The initial accuracy of the REF191ES-REEL is ±2 mV maximum. - How much supply current does the REF191ES-REEL consume?
The device consumes less than 45 μA of supply current and reduces to less than 15 μA in sleep mode. - What is the minimum supply voltage required for the REF191ES-REEL?
The device can operate with a supply voltage as low as 100 mV above the output voltage. - What is the temperature coefficient of the REF191ES-REEL?
The temperature coefficient is 5 ppm/°C maximum. - Does the REF191ES-REEL have short-circuit protection?
Yes, the device includes short-circuit protection. - What is the operating temperature range of the REF191ES-REEL?
The operating temperature range is −40°C to +85°C. - In what packages is the REF191ES-REEL available?
The REF191ES-REEL is available in an 8-lead SOIC package. - Is the REF191ES-REEL suitable for automotive applications?
Yes, it is suitable for automotive applications due to its extended temperature range and high reliability. - How does the sleep mode function in the REF191ES-REEL?
The sleep mode is enabled by applying a low TTL or CMOS level to the SLEEP pin, which turns off the output and reduces the supply current to less than 15 μA. - What type of applications benefit from the low dropout voltage of the REF191ES-REEL?
Applications such as portable instruments, smart sensors, and solar-powered systems benefit from the low dropout voltage.
