Key facts
- Brand
- Analog Devices
- Model
- AD650
- Industry
- Industrial
- Documents
- 4
- Languages
- EN
- Last added
- 2012-08-02
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Analog Devices AN-279 AD650 Voltage-to-Frequency Converter Application Note
This application note explains the architecture and operation of using the AD650 monolithic voltage-to-frequency converter in reverse mode as a frequency-to-voltage (F/V) converter. It details the circuit components, including a comparator, one-shot, constant current source, and lossy integrator, and provides the theoretical basis for the conversion process.
The document provides a step-by-step design procedure for selecting component values such as the one-shot time constant, integration resistor, and integration capacitor. It includes a specific design example for monitoring an automobile engine's RPM and discusses the trade-off between output ripple and circuit response time.
Analog Devices AD650 specifications
| Typical Nonlinearity (10 kHz) | 0.002 % |
|---|---|
| Industrial Temperature Range | -25 °C to +85 °C |
| Extended Temperature Range | -55 °C to +125 °C |
Source: Analog Devices AD650 Datasheet
All Analog Devices AD650 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
How to use the product for one specific task, with worked examples.
Questions answered in these manuals
What is the one-shot time constant for the AD650 current source?
The current source value for the AD650 is 1 mA.
From: Analog Devices AN-279 AD650 Voltage-to-Frequency Converter Application Note
How many time constants are required to achieve eight-bit settling accuracy?
An RC network needs six time constants to settle to eight bits of accuracy.
From: Analog Devices AN-279 AD650 Voltage-to-Frequency Converter Application Note
What is the typical nonlinearity of the AD650 at 10 kHz?
Typical nonlinearity is 0.002 % at 10 kHz.
Which packages are available for the AD650?
The AD650 is offered in plastic 14‑lead DIP (AD650JN, AD650KN), 20‑lead PLCC (AD650JP), ceramic DIP for industrial grades (AD650AD, AD650BD), and an extended‑temperature ceramic version (AD650SD).
What is the maximum supply voltage for the AD650?
The device can tolerate up to 36 V on its supply pins, but higher voltages may cause permanent damage.
What is the typical nonlinearity of the AD650 at 10 kHz?
Typical nonlinearity at 10 kHz is 0.002 % of full scale.