Overview
The REF191ESZ is a precision micropower, low dropout voltage reference from Analog Devices Inc. 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 results in a very low temperature coefficient and high initial accuracy. The REF191ESZ provides a stable output voltage of 2.048V and is designed for applications requiring low power consumption and high reliability.
Key Specifications
| Parameter | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Nominal Output Voltage | - | - | 2.048 | - | V |
| Initial Accuracy | E Grade, IOUT = 0 mA | - | - | ±2 mV | - |
| Temperature Coefficient | E Grade, IOUT = 0 mA | - | - | 5 ppm/°C | - |
| Supply Current | No load | - | - | 45 μA | - |
| Supply Current in Sleep Mode | No load | - | - | 15 μA | - |
| Line Regulation | 3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA | - | - | 10 ppm/V | - |
| Load Regulation | VS = 5.0 V, 0 mA ≤ IOUT ≤ 30 mA | - | - | 10 ppm/mA | - |
| Dropout Voltage | VS = 3.5 V, ILOAD = 10 mA | - | - | 1.00 V | - |
| Long-term Stability | 1000 hours @ 125°C | - | - | 1.2 mV | - |
| Noise Voltage | 0.1 Hz to 10 Hz | - | - | 25 μV p-p | - |
Key Features
- Precision micropower voltage reference with a nominal output voltage of 2.048V.
- High initial accuracy of ±2 mV max and low temperature coefficient of 5 ppm/°C max.
- Low dropout voltage, allowing stable output from supplies as low as 100 mV above the output voltage.
- Low supply current of 45 μA max and reduced to 15 μA max in sleep mode.
- Available in 8-lead SOIC, PDIP, and TSSOP packages.
- Specified over the extended industrial temperature range (−40°C to +85°C) with typical performance up to +125°C.
- Requires a 1 μF capacitor between the output pin and the GND pin for proper operation.
Applications
- Data acquisition systems requiring precise voltage references.
- Automotive and industrial control systems where high reliability and stability are crucial.
- Medical devices that demand accurate voltage references.
- Telecommunication equipment needing stable voltage references.
- Any application requiring low power consumption and high precision voltage reference.
Q & A
- What is the nominal output voltage of the REF191ESZ?
The nominal output voltage of the REF191ESZ is 2.048V.
- What is the initial accuracy of the REF191ESZ?
The initial accuracy of the REF191ESZ is ±2 mV max.
- What is the temperature coefficient of the REF191ESZ?
The temperature coefficient of the REF191ESZ is 5 ppm/°C max.
- How much supply current does the REF191ESZ consume?
The REF191ESZ consumes less than 45 μA of supply current and reduces to less than 15 μA in sleep mode.
- What packages are available for the REF191ESZ?
The REF191ESZ is available in 8-lead SOIC, PDIP, and TSSOP packages.
- What is the operating temperature range of the REF191ESZ?
The REF191ESZ is specified over the extended industrial temperature range (−40°C to +85°C) with typical performance up to +125°C.
- Is a capacitor required for proper operation of the REF191ESZ?
Yes, a 1 μF capacitor is required between the output pin and the GND pin for proper operation.
- What are some typical applications of the REF191ESZ?
Typical applications include data acquisition systems, automotive and industrial control systems, medical devices, and telecommunication equipment.
- Is the REF191ESZ RoHS compliant?
Yes, the REF191ESZ is RoHS compliant.
- Where can I find detailed specifications and documentation for the REF191ESZ?
Detailed specifications and documentation can be found on the Analog Devices website and through distributors like Digi-Key and LCSC.
