Overview
The AD637JRZ, produced by Analog Devices Inc., is a high-accuracy, wideband RMS-to-DC converter designed to compute the true RMS value of any complex waveform. This integrated circuit offers unprecedented performance in accuracy, bandwidth, and dynamic range, making it comparable to discrete and modular techniques. The AD637JRZ is suitable for applications requiring precise RMS measurements, such as power monitoring, audio/video equipment, and industrial instrumentation.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Comments |
|---|---|---|---|---|---|
| Nonlinearity | 0.02% | 0 V to 2 V rms input | |||
| Additional Error to Crest Factor of 3 | 0.1% | ||||
| Bandwidth | 8 MHz | At 2 V rms input | |||
| 600 kHz | At 100 mV rms input | ||||
| dB Output Range | 60 dB | ||||
| Operating Voltage Range | ±3.0 V | ±18 V | |||
| Quiescent Current | 2.2 mA | 3 mA | |||
| Standby Current | 350 µA | 450 µA | |||
| Operating Temperature Range | 0°C | 70°C | For Grade J and K |
Key Features
- High Accuracy: 0.02% maximum nonlinearity for inputs from 0 V to 2 V rms
- Wide Bandwidth: Up to 8 MHz at 2 V rms input and 600 kHz at 100 mV rms input
- dB Output: Direct dB value of the rms output with a 60 dB range
- Chip Select/Power-Down Feature: Reduces quiescent current from 2.2 mA to 350 µA and allows analog three-state operation
- Internal Trimming: Laser wafer trimmed for offset and scale factor without external trimming
- On-Chip Buffer Amplifier: Can be used as an input buffer or in an active filter configuration to reduce ac ripple
- Compact Package: Available in 16-lead SOIC_W package
Applications
- Power Monitoring and Measurement: Accurate RMS measurements for power systems
- Audio and Video Equipment: Precise signal measurement in audio and video applications
- Industrial Instrumentation and Control Systems: Reliable performance in industrial environments
- Medical Equipment: High accuracy required in medical devices
- Test and Measurement Devices: Used in various test and measurement instruments
Q & A
- What is the primary function of the AD637JRZ?
The AD637JRZ is a high-accuracy, wideband RMS-to-DC converter that computes the true RMS value of any complex waveform.
- What is the maximum nonlinearity of the AD637JRZ?
The maximum nonlinearity is 0.02% for inputs from 0 V to 2 V rms.
- What is the bandwidth of the AD637JRZ?
The bandwidth is up to 8 MHz at 2 V rms input and 600 kHz at 100 mV rms input.
- Does the AD637JRZ have a power-down feature?
Yes, the chip select/power-down feature reduces the quiescent current from 2.2 mA to 350 µA and allows analog three-state operation.
- What is the operating voltage range of the AD637JRZ?
The operating voltage range is ±3.0 V to ±18 V.
- What types of packages are available for the AD637JRZ?
The AD637JRZ is available in a 16-lead SOIC_W package.
- Is the AD637JRZ suitable for high-temperature applications?
The AD637JRZ is available in various temperature ranges, including 0°C to 70°C for Grade J and K, and up to −55°C to +125°C for Grade S.
- What is the purpose of the on-chip buffer amplifier?
The on-chip buffer amplifier can be used as an input buffer or in an active filter configuration to reduce ac ripple and increase accuracy.
- Does the AD637JRZ require external trimming?
No, the AD637JRZ is laser wafer trimmed for offset and scale factor, eliminating the need for external trimming.
- What are some common applications of the AD637JRZ?
Common applications include power monitoring, audio/video equipment, industrial instrumentation, medical equipment, and test and measurement devices.
