Overview
The REF198GSZ is a precision micropower, low dropout voltage (LDV) voltage reference IC from Analog Devices Inc. This device is part of the REF19x series, known for its high accuracy and stability over a wide temperature range. The REF198GSZ provides a fixed output voltage of 4.096V with a high initial accuracy and low temperature coefficient, making it suitable for various precision applications. The device operates with a low supply current of 45 μA and features a sleep mode that further reduces the supply current to 15 μA, enhancing power efficiency. It is available in an 8-lead SOIC package and is specified over the extended industrial temperature range of −40°C to +85°C.
Key Specifications
| Parameter | Symbol | Condition | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Output Voltage | VO | IOUT = 0 mA | 4.086 | 4.096 | 4.106 | V |
| Initial Accuracy | - | IOUT = 0 mA | - | - | ±0.24% | - |
| Supply Current | IS | No load | - | 45 | - | μA |
| Sleep Mode Supply Current | IS | No load | - | 15 | - | μA |
| Line Regulation | ΔVO/ΔVIN | 3.3 V ≤ VS ≤ 15 V, IOUT = 0 mA | - | - | 8 ppm/V | - |
| Load Regulation | ΔVO/ΔVLOAD | VS = 5.0 V, 0 mA ≤ IOUT ≤ 30 mA | - | - | 15 ppm/mA | - |
| Dropout Voltage | VS - VO | VS = 3.8 V, ILOAD = 10 mA | - | - | 0.80 V | - |
| Temperature Coefficient | TCVO | IOUT = 0 mA | - | - | 10 ppm/°C | - |
Key Features
- Precision Output Voltage: The REF198GSZ provides a highly accurate output voltage of 4.096V with an initial accuracy of ±0.24%.
- Low Dropout Voltage: The device can operate with a supply voltage as low as 100 mV above the output voltage, making it suitable for low-voltage applications.
- Low Supply Current: It consumes a maximum of 45 μA of supply current and reduces to 15 μA in sleep mode, enhancing power efficiency.
- High Stability: The REF198GSZ features a low temperature coefficient of 10 ppm/°C, ensuring stable output voltage over a wide temperature range.
- Short-Circuit Protection: The device includes short-circuit protection to prevent damage from overcurrent conditions.
- Compact Packaging: Available in an 8-lead SOIC package, making it suitable for space-constrained designs.
Applications
- Portable Instruments: Ideal for battery-powered devices due to its low power consumption and high accuracy.
- ADCs and DACs: Used as a reference voltage source in analog-to-digital and digital-to-analog converters.
- Smart Sensors: Suitable for precision sensing applications requiring stable reference voltages.
- Solar Powered Applications: The low power consumption makes it suitable for solar-powered systems.
- Loop-Current-Powered Instruments: Can be used in instruments powered by loop currents due to its low dropout voltage and high accuracy.
- Automotive Applications: Specified over the extended industrial temperature range, making it suitable for automotive and other harsh environment applications.
Q & A
- What is the output voltage of the REF198GSZ?
The output voltage of the REF198GSZ is 4.096V with an initial accuracy of ±0.24%.
- What is the maximum supply current of the REF198GSZ?
The maximum supply current of the REF198GSZ is 45 μA, and it reduces to 15 μA in sleep mode.
- What is the temperature coefficient of the REF198GSZ?
The temperature coefficient of the REF198GSZ is 10 ppm/°C.
- What is the dropout voltage of the REF198GSZ?
The dropout voltage of the REF198GSZ is as low as 0.80 V at ILOAD = 10 mA and VS = 3.8 V.
- Does the REF198GSZ have short-circuit protection?
Yes, the REF198GSZ includes short-circuit protection to prevent damage from overcurrent conditions.
- In what package is the REF198GSZ available?
The REF198GSZ is available in an 8-lead SOIC package.
- What are some typical applications of the REF198GSZ?
The REF198GSZ is typically used in portable instruments, ADCs and DACs, smart sensors, solar-powered applications, and loop-current-powered instruments.
- What is the operating temperature range of the REF198GSZ?
The REF198GSZ is specified over the extended industrial temperature range of −40°C to +85°C.
- Is a capacitor required for proper operation of the REF198GSZ?
Yes, a 1 μF capacitor is required between the output pin and the GND pin of the device for proper operation.
- How does the sleep mode affect the supply current of the REF198GSZ?
In sleep mode, the supply current of the REF198GSZ is reduced to less than 15 μA.
