Key facts
- Brand
- Analog Devices
- Model
- AD8305
- Industry
- Industrial
- Documents
- 2
- Languages
- EN
- Last added
- 2012-08-03
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AN-643 Closed-Loop Control Circuit Implementation of the ADuC832 and AD8305 in a Digital Variable Optical Attenuator
The document details the design of a control circuit for a Digital Variable Optical Attenuator (DVOA) capable of attenuating optical signals up to 40 dB. The system utilizes integrated photodiodes and Analog Devices components, specifically the ADuC832 MicroConverter IC and the AD8305 logarithmic amplifier, to measure input and output power levels.
Read onlineAnalog Devices AD8305 specifications
| Logarithmic Slope | 200 mV/dec (typ) |
|---|---|
| Logarithmic Intercept | 1 nA (typ) |
| Quiescent Current | ~5 mA |
| Supply Voltage Range | 3 V – 12 V (single or dual) |
| Operating Temperature Range | ‑40 °C to +85 °C |
| Maximum Output Current Sourcing | 20 mA |
Source: Analog Devices AD8305 Datasheet
All Analog Devices AD8305 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 maximum optical signal attenuation level supported by this DVOA?
The system is designed to attenuate optical signals up to 40 dB.
What voltage range must be applied to the control input to set the VOA attenuation?
The attenuation value is set using an analog control voltage in the range of 5 V to 26 V.
What supply voltage does the AD8305 require?
It operates from a single supply of 3 V to 12 V, or dual supplies within the same total range.
What is the typical quiescent current of the AD8305?
The device draws about 5 mA of quiescent current.