Overview
The AD780ANZ, produced by Analog Devices Inc., is an ultrahigh precision band gap reference voltage device. 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 device is renowned for its low initial error, low temperature drift, and low output noise, making it an ideal choice 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.
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 (AD780AN/AR), 3 ppm/°C (AD780BN/BR) |
| 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 | - | - | 75 µV/mA |
| Output Noise (0.1 Hz to 10 Hz) | - | 4 µV p-p | - |
| Wideband Spectral Noise Density | - | 100 nV/√Hz | - |
| Quiescent Current | - | - | 1 mA max |
| Output Current Capability | - | - | Up to 10 mA |
| Operating Temperature Range | -40°C | - | +85°C |
| Package Types | - | - | PDIP, SOIC |
Key Features
- Pin-programmable 2.5 V or 3.0 V output
- Ultralow drift: up to 3 ppm/°C max
- High accuracy: ±1 mV max for 2.5 V and 3.0 V outputs
- Low noise: 100 nV/√Hz and 4 µV p-p from 0.1 Hz to 10 Hz
- Low quiescent current: 1 mA max
- Output trim capability and noise reduction capability
- Plug-in upgrade for existing references like LT1019(A)-2.5 and AD680
- Temperature output pin for temperature transducer configuration
- Series or shunt mode operation (±2.5 V, ±3.0 V)
- No region of possible instability with a 1 µF bypass capacitor
Applications
The AD780ANZ is suitable for a variety of high-performance applications, including:
- Enhancing the performance of high-resolution analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
- General-purpose precision reference applications
- Temperature measurement and monitoring using the temperature output pin
- Any application requiring stable and precise voltage references with low noise and drift
Q & A
- What are the output voltage options for the AD780ANZ?
The AD780ANZ provides pin-programmable 2.5 V or 3.0 V output voltages. - What is the input voltage range for the AD780ANZ?
The input voltage range is between 4.0 V and 36 V. - What is the temperature drift specification for the AD780ANZ?
The temperature drift is up to 7 ppm/°C for AD780AN/AR and up to 3 ppm/°C for AD780BN/BR over the -40°C to +85°C range. - How much current can the AD780ANZ source or sink?
The AD780ANZ can source or sink up to 10 mA. - What are the package options for the AD780ANZ?
The device is available in PDIP and SOIC packages. - Can the AD780ANZ be used in series or shunt mode?
Yes, it can be used in both series and shunt mode, allowing for positive or negative output voltages without external components. - Does the AD780ANZ have any instability issues?
No, the AD780ANZ is stable under all load conditions when a 1 µF bypass capacitor is used on the supply. - What is the purpose of the temperature output pin on the AD780ANZ?
The temperature output pin allows the device to be configured as a temperature transducer while providing a stable 2.5 V or 3.0 V output. - Is the AD780ANZ compatible with other reference devices?
Yes, it is a pin-compatible performance upgrade for the LT1019(A)-2.5 and the AD680. - What is the operating temperature range for the AD780ANZ?
The operating temperature range is from -40°C to +85°C.
