Key facts
- Brand
- Analog Devices
- Model
- AN-21
- Documents
- 5
- Languages
- EN
- Last added
- 2012-08-02
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Analog Devices AN-213 Application Note
This document details the design of a low-cost, two-chip voltage-controlled amplifier (VCA) and video switch. The design utilizes the AD539JN analog multiplier in conjunction with the 5539N wideband operational amplifier to achieve a 50MHz bandwidth while meeting stringent differential phase and gain requirements. The combination allows the system to drive a 75-ohm terminated coaxial cable directly.
Read onlineAnalog Devices AN-21 specifications
| Bandwidth | 50MHz |
|---|---|
| Signal Input Range | + 2V |
| Control Input Range | zero to + 3V FS |
| Total Gain Range | 100dB |
| Total Harmonic Distortion | less than 0.05% |
All Analog Devices AN-21 documents by type
How to use the product for one specific task, with worked examples.
- Analog Devices AN-213 Application Note 6 p
- Analog Devices AN-214 Application Note Ground Rules for High-Speed Circuits 3 p
- Analog Devices AN-216 Application Note Video VCAs and Keyers 8 p
- Analog Devices AN-211 Application Note Current-Feedback Audio Power Amplifier 16 p
- Analog Devices AN-21 4-20mA Digital to Process Current Transmitter Application Note 2 p
Questions answered in these manuals
What components are used to create the VCA circuit?
The circuit uses the AD539JN analog multiplier and the 5539N wideband op-amp.
What is the maximum gain in the described VCA configuration?
The maximum gain is about 4.3dB when pin 9 is connected to the op-amp output.
What board type is recommended for high-speed designs?
Applications engineers recommend that all bread-board designs be done on double-sided copper-clad boards.
From: Analog Devices AN-214 Application Note Ground Rules for High-Speed Circuits
How should analog and digital grounds be connected on a PC board?
Analog ground and digital ground should be connected together within the PC board to enhance converter performance.
From: Analog Devices AN-214 Application Note Ground Rules for High-Speed Circuits
What components are used for the VCA circuits?
The circuits use the Analog Devices AD834 Four-Quadrant Multiplier and the AD811 Current-Feedback Op Amp.
From: Analog Devices AN-216 Application Note Video VCAs and Keyers
How does the video keyer blend signals?
It blends two video inputs (Va and Vb) under the control of a signal (Vg) to create effects like dissolves and overlays.
From: Analog Devices AN-216 Application Note Video VCAs and Keyers