Overview
The REF191GS, produced by 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. This design ensures a very low temperature coefficient and high initial accuracy. The REF191GS is designed to provide a stable output voltage 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 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 | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Initial Accuracy | IOUT = 0 mA | 2.046 | 2.048 | 2.050 | V |
| Line Regulation | 3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA | - | - | 4 ppm/V | - |
| Load Regulation | VS = 5.0 V, 0 mA ≤ IOUT ≤ 30 mA | - | - | 4 ppm/mA | - |
| Dropout Voltage | VS = 3.8 V, ILOAD = 10 mA | - | - | 0.80 V | - |
| Supply Current | No load | - | - | 45 μA | - |
| Supply Current in Sleep Mode | No load | - | - | 15 μA | - |
| Output Current | - | - | - | 30 mA | - |
| Operating Temperature | - | -40°C | - | +85°C | - |
| Temperature Coefficient | IOUT = 0 mA | - | - | 25 ppm/°C | - |
| Package | - | - | - | 8-Lead SOIC | - |
Key Features
- Precision and Stability: High initial accuracy of ±2 mV and a low temperature coefficient of 5 ppm/°C, ensuring stable output voltage across a wide temperature range.
- Low Power Consumption: Maximum supply current of 45 μA and a sleep mode that reduces this to 15 μA, making it suitable for battery-powered and low-power applications.
- Low Dropout Voltage: Operates with supplies as low as 100 mV above the output voltage, and features a dropout voltage as low as 0.80 V.
- High Output Current: Capable of delivering up to 30 mA of output current.
- Short-Circuit Protection: Built-in protection against short-circuit conditions.
- Compact Packaging: Available in an 8-lead SOIC package, suitable for surface mount applications.
Applications
- Portable Instruments: Ideal for use in portable devices due to its low power consumption and compact size.
- ADCs and DACs: Suitable for analog-to-digital and digital-to-analog converters requiring precise voltage references.
- Smart Sensors: Used in smart sensor applications where high accuracy and low power are critical.
- Solar Powered Applications: Appropriate for solar-powered systems due to its low dropout voltage and micropower characteristics.
- Loop-Current-Powered Instruments: Suitable for instruments powered by loop currents, such as those in industrial automation.
- Automotive Applications: Specified over an extended industrial temperature range, making it suitable for automotive applications.
Q & A
- What is the initial accuracy of the REF191GS?
The initial accuracy of the REF191GS is ±2 mV.
- What is the maximum supply current of the REF191GS?
The maximum supply current is 45 μA, and it reduces to 15 μA in sleep mode.
- What is the minimum input voltage required for the REF191GS to operate?
The REF191GS can operate with supplies as low as 100 mV above the output voltage.
- What is the maximum output current of the REF191GS?
The maximum output current is 30 mA.
- What is the operating temperature range of the REF191GS?
The operating temperature range is from -40°C to +85°C.
- What type of packaging is available for the REF191GS?
The REF191GS is available in an 8-lead SOIC package.
- Does the REF191GS have built-in short-circuit protection?
Yes, the REF191GS has built-in short-circuit protection.
- What is the temperature coefficient of the REF191GS?
The temperature coefficient is 25 ppm/°C.
- Can the REF191GS be used in automotive applications?
Yes, the REF191GS is specified over an extended industrial temperature range, making it suitable for automotive applications.
- How does the sleep mode affect the supply current of the REF191GS?
In sleep mode, the supply current is reduced to less than 15 μA.
