Overview
The AD780AR, produced by Analog Devices Inc., is an ultrahigh precision band gap reference voltage IC. It provides a pin-programmable 2.5 V or 3.0 V output from input voltages ranging between 4.0 V and 36 V. This component is designed to offer low initial error, low temperature drift, and low output noise, making it ideal for enhancing the performance of high-resolution analog-to-digital converters (ADCs) and digital-to-analog converters (DACs), as well as general-purpose precision reference applications.
Key Specifications
| Parameter | Min | Typ | Max |
|---|---|---|---|
| Output Voltage (2.5 V) | 2.495 V | 2.5 V | 2.505 V |
| Output Voltage (3.0 V) | 2.995 V | 3.0 V | 3.005 V |
| Temperature Drift (-40°C to +85°C) | 7 ppm/°C | ||
| Line Regulation (2.5 V Output, 4 V ≤ +VIN ≤ 36 V) | 10 µV/V | ||
| Line Regulation (3.0 V Output, 4.5 V ≤ +VIN ≤ 36 V) | 10 µV/V | ||
| Load Regulation, Series Mode | 10 µV/V | ||
| Output Noise (0.1 Hz to 10 Hz) | 4 µV p-p | ||
| Wideband Spectral Noise Density | 100 nV/√Hz | ||
| Quiescent Current | 1 mA | ||
| Maximum Output Current | 10 mA | ||
| Operating Temperature Range | -40°C | +85°C | |
| Package Type | 8-SOIC (0.154, 3.90mm Width) |
Key Features
- Pin Programmable Output: The AD780AR allows for pin-programmable 2.5 V or 3.0 V output voltages.
- Low Drift and High Accuracy: Ultralow drift of 3 ppm/°C max and high accuracy of ±1 mV max for both output voltages.
- Low Noise: Extremely low noise, typically 4 µV p-p from 0.1 Hz to 10 Hz and a wideband spectral noise density of typically 100 nV/√Hz.
- Low Quiescent Current: Maximum quiescent current of 1 mA.
- Output Trim Capability: Optional fine-trim connection for higher accuracy.
- Temperature Output Pin: Enables configuration as a temperature transducer while providing a stable output reference.
- Series or Shunt Mode Operation: Can source or sink up to 10 mA and operate in series or shunt mode.
- Stability Under Load: Stable under all load conditions with a 1 µF bypass capacitor on the supply.
Applications
- High-Resolution ADCs and DACs: Ideal for enhancing the performance of high-resolution analog-to-digital converters and digital-to-analog converters.
- General-Purpose Precision Reference: Suitable for any general-purpose precision reference application.
- Temperature Transducer: Can be configured as a temperature transducer while providing a stable output reference.
- Low Power Applications: Although not specifically targeted at low power, it can be used in such applications due to its low quiescent current.
Q & A
- What are the available output voltages for the AD780AR?
The AD780AR provides pin-programmable 2.5 V or 3.0 V output voltages.
- What is the temperature drift of the AD780AR?
The temperature drift is 7 ppm/°C max from -40°C to +85°C.
- How much noise does the AD780AR typically produce?
The AD780AR produces typically 4 µV p-p noise from 0.1 Hz to 10 Hz and a wideband spectral noise density of typically 100 nV/√Hz.
- What is the maximum quiescent current of the AD780AR?
The maximum quiescent current is 1 mA.
- Can the AD780AR be used in series or shunt mode?
Yes, the AD780AR can be used in both series and shunt mode, allowing it to source or sink up to 10 mA.
- What is the operating temperature range of the AD780AR?
The operating temperature range is from -40°C to +85°C.
- What package types are available for the AD780AR?
The AD780AR is available in 8-SOIC (0.154, 3.90mm Width) packages.
- Can the AD780AR be used as a temperature transducer?
Yes, the AD780AR has a temperature output pin that allows it to be configured as a temperature transducer.
- Is the AD780AR stable under all load conditions?
Yes, the AD780AR is stable under all load conditions when a 1 µF bypass capacitor is used on the supply.
- What are some common applications for the AD780AR?
The AD780AR is commonly used in high-resolution ADCs and DACs, general-purpose precision reference applications, and as a temperature transducer.
