Overview
The AD8362ARU from Analog Devices Inc. is a highly accurate, true rms-responding power detector designed for a wide range of high-frequency communication applications. It operates over a frequency range of 50 Hz to 3.8 GHz and offers a measurement range of over 65 dB. This device is particularly notable for its ability to accurately measure waveforms with high peak-to-rms ratios (crest factors) independent of the signal frequency or magnitude. The AD8362ARU is fully calibrated and features a unique combination of a 3.5 GHz, 40 dB fixed gain amplifier and a variable gain amplifier (VGA) with a ladder attenuator, making it suitable for use as a calibrated RF wattmeter.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Frequency Range | 50 Hz to 3.8 GHz | |
| Measurement Range | Over 65 dB | |
| Supply Voltage | Nominally 5 V (±10% tolerance) | |
| Differential Input Resistance | 200 Ω (becomes 50 Ω with balun) | |
| Fixed Gain Amplifier Bandwidth | 3.5 GHz | |
| Fixed Gain Amplifier Gain | 40 dB | |
| VGA Attenuation Range | 69.3 dB | |
| -3 dB Point | About 3.5 GHz |
Key Features
- High accuracy true rms measurement independent of signal frequency and magnitude.
- Wide frequency range operation from 50 Hz to 3.8 GHz.
- Measurement range of over 65 dB.
- Internal 3.5 GHz, 40 dB fixed gain amplifier and VGA with a ladder attenuator.
- Capable of handling high peak-to-rms ratios (crest factors).
- Single supply operation with a nominal voltage of 5 V and ±10% tolerance.
- Differential input with 200 Ω resistance, which can be matched to 50 Ω using a balun.
Applications
- High-frequency communication systems.
- RF power measurement and monitoring.
- Calibrated RF wattmeters.
- High accuracy rms voltmeters at low frequencies.
- Wireless infrastructure and base stations.
- Test and measurement equipment.
Q & A
- What is the frequency range of the AD8362ARU?
The AD8362ARU operates over a frequency range of 50 Hz to 3.8 GHz.
- What is the measurement range of the AD8362ARU?
The measurement range of the AD8362ARU is over 65 dB.
- What is the supply voltage for the AD8362ARU?
The AD8362ARU operates on a nominal supply voltage of 5 V with a ±10% tolerance.
- How does the AD8362ARU handle high peak-to-rms ratios?
The AD8362ARU can accurately measure waveforms with high peak-to-rms ratios (crest factors) independent of the signal frequency or magnitude.
- What is the differential input resistance of the AD8362ARU?
The differential input resistance is 200 Ω, which can be matched to 50 Ω using a balun.
- What are the key components of the AD8362ARU's signal path?
The AD8362ARU features a 3.5 GHz, 40 dB fixed gain amplifier and a VGA with a ladder attenuator.
- What are some common applications of the AD8362ARU?
Common applications include high-frequency communication systems, RF power measurement, calibrated RF wattmeters, and high accuracy rms voltmeters at low frequencies.
- How does the AD8362ARU ensure accurate measurements at low frequencies?
The AD8362ARU's system is internally dc-coupled, allowing it to be used as a high accuracy rms voltmeter at low frequencies.
- What is the significance of the -3 dB point in the AD8362ARU's specifications?
The -3 dB point occurs at about 3.5 GHz, indicating the bandwidth of the fixed gain amplifier.
- How should the input be coupled to the AD8362ARU?
The input must be ac-coupled to the AD8362ARU, and for frequencies above 5 MHz, a 1 nF capacitor is adequate. For higher frequencies, additional matching components may be required.
