Overview
The AD736ARZ, produced by Analog Devices Inc., is a low power, precision, monolithic true rms-to-dc converter. It is designed to convert an ac voltage waveform to a dc voltage, providing true rms, average rectified, or absolute value measurements. The device is laser trimmed to ensure high accuracy, with a maximum error of ±0.3 mV ± 0.3% of reading for sine wave inputs. It is particularly suited for battery-powered applications due to its low power consumption of 1 mW and maximum supply current of 200 µA.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Range | 200 mV rms full-scale (larger inputs with input attenuator) | mV rms |
| Input Impedance | 10 MΩ (FET input), 8 kΩ (low impedance input) | Ω |
| Input Bias Current | 25 pA maximum | pA |
| Accuracy | ±0.3 mV ± 0.3% of reading | mV, % |
| Crest Factor Range | Up to 5 (with 2.5% additional error at 200 mV full-scale) | - |
| Power Supply Range | +2.8 V, −3.2 V to ±16.5 V | V |
| Supply Current | 200 µA maximum | µA |
| Output Type | Buffered voltage output | - |
| Temperature Range | Commercial: 0°C to +70°C, Industrial: −40°C to +85°C | °C |
| Package Types | PDIP, SOIC, CERDIP | - |
Key Features
- Computes the true rms, average rectified, or absolute value of various input signals.
- High input impedance (10 MΩ) eliminates the need for an external buffer when interfacing with high-Z input attenuators.
- Low impedance input (8 kΩ) allows measurement of up to 300 mV rms input levels from low power supply voltages.
- Low power consumption of 1 mW, making it suitable for battery-powered applications.
- No external trims needed for specified accuracy.
- Operates as an ac-coupled device with the addition of one external capacitor, resolving input signal levels as low as 100 μV rms.
- High accuracy maintained for input waveforms with crest factors of 1 to 5.
- Includes an output buffer amplifier for design flexibility.
Applications
The AD736ARZ is optimized for use in various applications, including:
- Portable multimeters and other battery-powered measurement devices.
- Upgrading the performance of non-rms precision rectifiers in many applications.
- Measuring ac and dc input voltages in industrial and commercial environments.
- Applications requiring high accuracy and low power consumption, such as in medical devices and automotive systems.
Q & A
- What is the primary function of the AD736ARZ?
The AD736ARZ converts an ac voltage waveform to a dc voltage, providing true rms, average rectified, or absolute value measurements.
- What is the input range of the AD736ARZ?
The input range is 200 mV rms full-scale, with larger inputs possible using an input attenuator.
- What are the input impedance options for the AD736ARZ?
The device offers a high impedance FET input (10 MΩ) and a low impedance input (8 kΩ).
- How accurate is the AD736ARZ?
The device has a maximum error of ±0.3 mV ± 0.3% of reading for sine wave inputs.
- What is the power supply range for the AD736ARZ?
The power supply range is +2.8 V, −3.2 V to ±16.5 V.
- What is the maximum supply current of the AD736ARZ?
The maximum supply current is 200 µA.
- Can the AD736ARZ operate as an ac-coupled device?
Yes, it can operate as an ac-coupled device with the addition of one external capacitor.
- What are the typical applications for the AD736ARZ?
It is used in portable multimeters, upgrading non-rms precision rectifiers, and in applications requiring high accuracy and low power consumption.
- What are the available package types for the AD736ARZ?
The device is available in PDIP, SOIC, and CERDIP packages.
- What is the temperature range for the AD736ARZ?
The commercial grades operate from 0°C to +70°C, and the industrial grades operate from −40°C to +85°C.
