Overview
The AD636KHZ is a low-power monolithic integrated circuit (IC) designed by Analog Devices Inc. for true root-mean-square (rms) to DC conversion of low-level signals. This device offers high accuracy and performance comparable to or superior to more expensive hybrid and modular converters. It is specified for a signal range of 0 mV to 200 mV rms and can accommodate crest factors up to 6 with less than 0.5% additional error, making it suitable for accurate measurement of complex input waveforms.
Key Specifications
| Parameter | Value |
|---|---|
| Accuracy | 0.5% maximum error (AD636K), 1.0% maximum error (AD636J) |
| Signal Range | 0 mV to 200 mV rms |
| Bandwidth | 1 MHz, −3 dB bandwidth: V rms > 100 mV |
| Crest Factor | Up to 6 for 0.5% error |
| Power Supply | Dual or single supply: ±2.5 V to ±16.5 V or +5 V to +24 V |
| Quiescent Current | Typically 800 μA |
| Operating Temperature | 0°C to 70°C |
| Package | 10-lead TO-100 metal can |
| Output Buffer | Short-circuit protected, sources up to 5 mA |
Key Features
- True rms-to-dc conversion for ac and dc signals
- Laser-trimmed for high accuracy at the wafer level, eliminating the need for external trims
- Low power consumption, suitable for battery-powered portable instruments
- Input and output terminals are fully protected, allowing input signals to exceed the power supply without damage
- Auxiliary dB output derived from an internal circuit point, representing the logarithm of the rms output
- Optional on-chip amplifier for input or output buffering, providing accurate performance with standard 10 MΩ input attenuators and sourcing up to 5 mA as an output buffer
Applications
The AD636KHZ is ideal for various applications requiring accurate rms measurements, including:
- Battery-powered hand-held instruments due to its low power consumption
- High accuracy rms measurements in industrial and scientific instruments
- Measurement of complex ac and dc waveforms in audio, medical, and test equipment
Q & A
- What is the primary function of the AD636KHZ? The AD636KHZ performs true root-mean-square (rms) to DC conversion of low-level signals.
- What is the accuracy of the AD636KHZ? The AD636KHZ has a maximum error of 0.5% for the K-version and 1.0% for the J-version.
- What is the signal range of the AD636KHZ? The signal range is from 0 mV to 200 mV rms.
- What is the bandwidth of the AD636KHZ? The bandwidth is 1 MHz, −3 dB bandwidth: V rms > 100 mV.
- What is the crest factor capability of the AD636KHZ? It can accommodate crest factors up to 6 with less than 0.5% additional error.
- What are the power supply options for the AD636KHZ? It can operate from dual or single power supplies: ±2.5 V to ±16.5 V or +5 V to +24 V.
- What is the typical quiescent current of the AD636KHZ? The typical quiescent current is 800 μA.
- What is the operating temperature range of the AD636KHZ? The operating temperature range is from 0°C to 70°C.
- What type of package is the AD636KHZ available in? It is available in a 10-lead TO-100 metal can package.
- Does the AD636KHZ have any protective features? Yes, the input and output terminals are fully protected, and the output buffer is short-circuit protected.
