Overview
The AD636JH, produced by Analog Devices Inc., is a low power monolithic IC designed for true rms-to-dc conversion on low level signals. It offers performance comparable or superior to that of hybrid and modular converters, making it a cost-effective solution. The device 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, allowing accurate measurement of complex input waveforms. It is ideal for battery-powered portable instruments due to its low power supply current requirement of typically 800 μA.
Key Specifications
| Parameter | Value | Notes |
|---|---|---|
| Accuracy | ±1.0% of reading (J-version) | Total error including offset and linearity |
| Bandwidth | 1 MHz, −3 dB at V rms > 100 mV | Frequency response range |
| Supply Voltage Range | ±2.5 V to ±16.5 V or +5 V to +24 V | Dual and single supply operation |
| Supply Current | Typically 800 μA | Quiescent current |
| Power Dissipation | 500 mW | Maximum power dissipation |
| Signal Range | 0 mV to 200 mV rms | Input signal range |
| Crest Factor | Up to 6 for 0.5% error | Accommodation of complex waveforms |
| Output Buffer | Short-circuit protected, sources up to 5 mA | Output buffer characteristics |
| Package | 10-lead TO-100 metal can | Physical package type |
| Operating Temperature | 0°C to 70°C | Temperature range for operation |
Key Features
- True rms-to-dc conversion for ac and dc signals
- Wide response capability with 1 MHz bandwidth at V rms > 100 mV
- Low power consumption with a quiescent current of 800 μA
- Operates from a wide range of dual and single power supplies
- Input and output terminals are fully protected
- Auxiliary dB output derived from an internal circuit point
- Optional on-chip amplifier for input or output buffering
- No external trims required for full-rated accuracy due to factory trimming
Applications
- Battery-powered portable instruments
- Hand-held measurement devices
- Display-oriented ADC systems
- Any application requiring accurate measurement of complex waveforms
Q & A
- What is the primary function of the AD636JH?
The AD636JH performs true rms-to-dc conversion on low level signals, computing the root-mean-square of ac and dc input signals and providing an equivalent dc output level.
- What is the accuracy of the AD636JH?
The total error of the J-version is typically less than ±1.0% of reading.
- What is the bandwidth of the AD636JH?
The bandwidth is 1 MHz at V rms > 100 mV, with a −3 dB point.
- What is the supply voltage range for the AD636JH?
The device operates from ±2.5 V to ±16.5 V or from +5 V to +24 V.
- How much power does the AD636JH consume?
The quiescent current is typically 800 μA, making it suitable for battery-powered devices.
- What is the signal range of the AD636JH?
The input signal range is from 0 mV to 200 mV rms.
- Is the AD636JH protected against overvoltage and short circuits?
- Does the AD636JH require external trims for accuracy?
No, the device is factory-trimmed at the wafer level for input and output offset, waveform symmetry, and full-scale accuracy.
- What is the operating temperature range of the AD636JH?
- What packages are available for the AD636JH?
