Key facts
- Brand
- Analog Devices
- Model
- AD640
- Industry
- Industrial
- Documents
- 3
- Languages
- EN
- Last added
- 2026-10-15
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AD640 120 MHz Logarithmic Amplifier Datasheet
The AD640 is a complete monolithic logarithmic amplifier designed for precision instrumentation applications such as radar and sonar. It provides up to 50 dB of dynamic range for frequencies from DC to 120 MHz using a successive detection scheme. The device features five cascaded DC-coupled amplifier/limiter stages, each with a 10 dB gain and 350 MHz bandwidth, resulting in a fully differential signal path.
Read onlineAnalog Devices AD640 specifications
| Dynamic Range | up to 50 dB |
|---|---|
| Frequency Range | DC to 120 MHz |
| Small Signal Gain | 10 dB per stage |
| Bandwidth per Stage | 350 MHz |
| Supply Voltage Range | –4.5 V to –7.5 V |
| Quiescent Current | Typically 220 mW at 65 V |
| Temperature Range (Military) | –55°C to +125°C |
All Analog Devices AD640 documents by type
Ratings, dimensions and ordering codes, for selection and design work.
Questions answered in these manuals
What is the dynamic range of the AD640?
The AD640 provides up to 50 dB of dynamic range for frequencies from DC to 120 MHz.
What are the supply voltage requirements?
The device operates with supply voltages ranging from –4.5 V to –7.5 V.
What is the supply voltage range for the AD640?
The AD640 operates from +4.5 V to +7.5 V.
What is the differential input resistance of the AD640?
The differential input resistance is 500 Ω.
What is the differential input resistance of the AD640?
The differential input resistance is 500 Ω.
What temperature ranges are covered by the AD640 variants?
AD640B is rated –40 °C to +85 °C, AD640T –55 °C to +125 °C, and AD640J 0 °C to +70 °C.