Overview
The AD637JDZ, produced by Analog Devices Inc., is a high-accuracy, monolithic rms-to-dc converter designed to compute the true rms value of any complex waveform. This integrated circuit offers unprecedented performance in terms of accuracy, bandwidth, and dynamic range, making it comparable to discrete and modular techniques. The AD637JDZ operates from a single or dual polarity power supply and can handle both AC and DC input signals, making it versatile for various applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 0 | - | 2 | V rms |
| Nonlinearity | - | - | 0.02% | - |
| Bandwidth | - | - | 8 MHz (at 2 V rms input) | - |
| Bandwidth | - | - | 600 kHz (at 100 mV rms input) | - |
| Supply Voltage Range | ±3.0 | - | ±18 | V |
| Quiescent Current | - | 2.2 | 3 | mA |
| Standby Current | 350 | - | 450 | μA |
| Operating Temperature Range | 0 | - | 70 | °C (Grade J and K) |
Key Features
- High accuracy with 0.02% maximum nonlinearity for inputs from 0 V to 2 V rms.
- Wide bandwidth, allowing measurements up to 8 MHz at 2 V rms input and 600 kHz at 100 mV rms input.
- Computes true rms, square, mean square, and absolute value of complex waveforms.
- Direct dB output with a 60 dB range available on a separate pin.
- Externally programmable reference current to set the 0 dB reference voltage between 0.1 V and 2.0 V rms.
- Chip select/power-down feature to reduce quiescent current from 2.2 mA to 350 μA.
- Internal trimming for offset and scale factor without external components.
- On-chip buffer amplifier for input buffering or active filter configuration.
- Protected input circuitry against overload voltages.
Applications
- Power monitoring and measurement.
- Audio and video equipment.
- Industrial instrumentation and control systems.
- Medical equipment.
- Test and measurement devices.
Q & A
- What is the primary function of the AD637JDZ?
The AD637JDZ is a high-accuracy rms-to-dc converter that computes the true rms value of any complex waveform.
- What is the input voltage range for the AD637JDZ?
The input voltage range is from 0 V to 2 V rms.
- What is the maximum nonlinearity of the AD637JDZ?
The maximum nonlinearity is 0.02% for inputs from 0 V to 2 V rms.
- What is the bandwidth of the AD637JDZ?
The bandwidth is up to 8 MHz at 2 V rms input and up to 600 kHz at 100 mV rms input.
- How does the chip select/power-down feature work?
The chip select/power-down feature reduces the quiescent current from 2.2 mA to 350 μA when the rms function is not in use.
- What types of packages are available for the AD637JDZ?
The AD637JDZ is available in 14-lead SBDIP, 14-lead CERDIP, and 16-lead SOIC_W packages.
- What is the operating temperature range for the AD637JDZ?
The operating temperature range is from 0°C to 70°C for Grade J and K models.
- Is the AD637JDZ protected against overload voltages?
- What is the purpose of the on-chip buffer amplifier?
The on-chip buffer amplifier can be used either as an input buffer or in an active filter configuration to reduce ac ripple and increase accuracy.
- Is the AD637JDZ still in production?
No, the AD637JDZ is an obsolete product, but there are alternative models available such as the AD636 and AD737 series.
