Overview
The AD780ARZ, produced by Analog Devices Inc., is an ultrahigh precision band gap reference voltage. This component is designed to provide a highly accurate and stable 2.5 V or 3.0 V output from input voltages ranging between 4.0 V and 36 V. It is particularly suited for enhancing the performance of high-resolution analog-to-digital converters (ADCs) and digital-to-analog converters (DACs), as well as for general-purpose precision reference applications.
The AD780ARZ stands out due to its low initial error, low temperature drift, and minimal output noise. It also features a unique low headroom design, allowing a 3.0 V output from a 5.0 V ± 10% input, which enhances the dynamic range of ADCs compared to traditional 2.5 V references.
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 | - | - | - |
| Output Current | - | - | ±10 mA |
| Quiescent Current | - | - | 1 mA |
| Noise (Wideband Spectral Noise Density) | - | - | 100 nV/√Hz |
| Operating Temperature Range | -40°C | - | +85°C |
Key Features
- Pin Programmable Output: The AD780ARZ allows for pin programmable 2.5 V or 3.0 V output.
- Ultralow Drift: It features an ultralow temperature drift of 3 ppm/°C max.
- High Accuracy: The component offers high accuracy with output voltages of ±1 mV max.
- Low Noise: It has extremely low noise, with a wideband spectral noise density of typically 100 nV/√Hz.
- Low Quiescent Current: The quiescent current is low, at 1 mA max.
- Output Trim Capability: An optional fine-trim connection is provided for applications requiring even higher accuracy.
- Series or Shunt Mode Operation: The AD780ARZ can operate in series or shunt mode, allowing positive or negative output voltages without external components.
- Temperature Output Pin: A temperature output pin provides an output voltage that varies linearly with temperature, enabling the part to be configured as a temperature transducer.
Applications
The AD780ARZ is ideal for various high-performance applications, including:
- High-Resolution Analog-to-Digital Converters (ADCs): Enhances the performance of ADCs by providing a stable and accurate reference voltage.
- Digital-to-Analog Converters (DACs): Improves the accuracy and stability of DACs.
- General-Purpose Precision Reference Applications: Suitable for any application requiring a high-precision voltage reference.
- Temperature Measurement: Can be configured as a temperature transducer due to its temperature output pin.
Q & A
- What are the output voltage options for the AD780ARZ?
The AD780ARZ provides pin programmable 2.5 V or 3.0 V output.
- What is the temperature drift of the AD780ARZ?
The temperature drift is 7 ppm/°C max from -40°C to +85°C.
- What is the noise level of the AD780ARZ?
The wideband spectral noise density is typically 100 nV/√Hz.
- Can the AD780ARZ operate in series or shunt mode?
Yes, it can operate in both series and shunt mode, allowing positive or negative output voltages without external components.
- What is the maximum output current of the AD780ARZ?
The AD780ARZ can source or sink up to 10 mA.
- What is the quiescent current of the AD780ARZ?
The quiescent current is 1 mA max.
- Does the AD780ARZ have a temperature output pin?
Yes, it has a temperature output pin that provides an output voltage varying linearly with temperature.
- What are the typical applications of the AD780ARZ?
It is used in high-resolution ADCs, DACs, general-purpose precision reference applications, and temperature measurement.
- What is the operating temperature range of the AD780ARZ?
The operating temperature range is from -40°C to +85°C.
- Is the AD780ARZ stable under all load conditions?
Yes, it is stable under all load conditions when a 1 µF bypass capacitor is used on the supply.
