Overview
The REF198G, part of the REF19x series from Analog Devices, is a precision band gap voltage reference. This device is designed to provide a highly stable output voltage with low temperature coefficient and high initial accuracy. The REF198G uses a patented temperature drift curvature correction circuit and laser trimming of highly stable, thin-film resistors to achieve these performance characteristics.
The REF198G is a micropower, low dropout voltage (LDV) device, capable of operating from supplies as low as 100 mV above the output voltage and 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 |
|---|---|---|---|---|---|
| Nominal Output Voltage | - | - | 4.096 | - | V |
| Temperature Coefficient (TCVO) | E Grade, IOUT = 0 mA | 2 | - | 5 | ppm/°C |
| Temperature Coefficient (TCVO) | F Grade, IOUT = 0 mA | 5 | - | 10 | ppm/°C |
| Temperature Coefficient (TCVO) | G Grade, IOUT = 0 mA | 10 | - | 25 | ppm/°C |
| Initial Accuracy | E Grade, IOUT = 0 mA | - | - | ±2 mV | - |
| Supply Current | No load | - | - | 45 μA | - |
| Supply Current in Sleep Mode | No load | - | - | 15 μA | - |
| High Output Current | - | - | - | 30 mA | - |
| Line Regulation | E Grade, 3.0 V ≤ VS ≤ 15 V, IOUT = 0 mA | 5 | - | 10 | ppm/V |
| Load Regulation | E Grade, VS = 5.0 V, 0 mA ≤ IOUT ≤ 25 mA | 5 | - | 15 | ppm/mA |
| Dropout Voltage | VS = 3.3 V, ILOAD = 10 mA | - | - | 1.25 V | - |
Key Features
- Precision Voltage Reference: The REF198G offers a nominal output voltage of 4.096V with high initial accuracy and low temperature coefficient.
- Micropower and Low Dropout Voltage: Operates from supplies as low as 100 mV above the output voltage and consumes less than 45 μA of supply current.
- Sleep Mode: Reduces supply current to less than 15 μA when enabled by a low TTL or CMOS level on the SLEEP pin.
- High Output Current: Capable of delivering up to 30 mA of output current.
- Low Line and Load Regulation: Ensures stable output voltage across a range of supply voltages and load conditions.
- Short-Circuit Protection: Built-in protection against short-circuit conditions.
- Extended Industrial Temperature Range: Specified over −40°C to +85°C with typical performance up to +125°C.
Applications
- Portable Instruments: Ideal for battery-powered devices requiring stable voltage references.
- ADCs and DACs: Used in analog-to-digital and digital-to-analog converters for precise voltage referencing.
- Smart Sensors: Suitable for sensor applications requiring high accuracy and low power consumption.
- Solar Powered Applications: Efficient for use in solar-powered systems due to its low power consumption.
- Loop-Current-Powered Instruments: Used in instruments powered by loop currents, such as in industrial automation.
- Automotive Applications: Meets the requirements for automotive applications with its extended temperature range and reliability.
Q & A
- What is the nominal output voltage of the REF198G?
The nominal output voltage of the REF198G is 4.096V.
- What is the maximum temperature coefficient of the REF198G?
The maximum temperature coefficient of the REF198G is 5 ppm/°C for the E grade.
- How much supply current does the REF198G consume in normal operation?
The REF198G consumes less than 45 μA of supply current in normal operation.
- What is the supply current in sleep mode?
In sleep mode, the supply current is reduced to less than 15 μA.
- What is the maximum output current of the REF198G?
The REF198G can deliver up to 30 mA of output current.
- What is the dropout voltage of the REF198G at a load current of 10 mA?
The dropout voltage at a load current of 10 mA and a supply voltage of 3.3 V is 1.25 V.
- Does the REF198G have short-circuit protection?
Yes, the REF198G has built-in short-circuit protection.
- What is the operating temperature range of the REF198G?
The REF198G is specified over the extended industrial temperature range of −40°C to +85°C, with typical performance up to +125°C.
- In which packages is the REF198G available?
The REF198G is available in 8-lead SOIC and TSSOP packages.
- What applications are the REF198G suitable for?
The REF198G is suitable for portable instruments, ADCs and DACs, smart sensors, solar powered applications, loop-current-powered instruments, and automotive applications.
