Overview
The AD736JR, produced by Analog Devices Inc., is a low power, precision, monolithic true rms-to-dc converter. This device is designed to compute the rms value of both ac and dc input voltages, as well as the average rectified or absolute value of various input signals. It is optimized for use in battery-powered applications due to its low power consumption of 1 mW and maximum supply current of 200 μA. The AD736JR features high accuracy, with a maximum error of ±0.3 mV ± 0.3% of reading, and maintains this accuracy over a wide range of input waveforms, including those with crest factors up to 5.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Range | 200 mV rms full-scale (larger inputs with input attenuator) | mV |
| High Impedance Input | 10^12 Ω | Ω |
| Low Impedance Input | 8 kΩ | kΩ |
| Input Bias Current | 25 pA maximum | pA |
| Accuracy | ±0.3 mV ± 0.3% of reading | mV, % |
| Power Supply Range | +2.8 V, −3.2 V to ±16.5 V | V |
| Supply Current | 200 μA maximum | μA |
| Operating Temperature Range | 0°C to +70°C (AD736J, AD736K), −40°C to +85°C (AD736A, AD736B) | °C |
| Package Types | PDIP, SOIC, CERDIP | - |
Key Features
- Computes the true rms, average rectified, or absolute value of various input signals.
- High input impedance (10^12 Ω) eliminates the need for an external buffer when interfacing with input attenuators.
- Low impedance input (8 kΩ) allows measurement of up to 300 mV rms input levels while operating 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.
- Buffered voltage output provides design flexibility.
- Can operate as an ac-coupled device with the addition of one external capacitor.
- Maintains high accuracy for input waveforms with crest factors up to 5.
Applications
The AD736JR is optimized for use in various applications, including:
- Portable multimeters and other battery-powered measurement instruments.
- 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 handheld test equipment.
Q & A
- What is the primary function of the AD736JR?
The AD736JR is a true rms-to-dc converter that computes the rms value of both ac and dc input voltages, as well as the average rectified or absolute value of various input signals.
- What is the input range of the AD736JR?
The AD736JR has a full-scale input range of 200 mV rms, with the option to measure larger inputs using an input attenuator.
- What are the key features of the AD736JR's input terminals?
The AD736JR features two input terminals: a high impedance FET input (10^12 Ω) and a low impedance input (8 kΩ), which can be used either single-ended or differentially.
- How accurate is the AD736JR?
The AD736JR has a maximum error of ±0.3 mV ± 0.3% of reading, maintaining high accuracy for input waveforms with crest factors up to 5.
- What is the power consumption of the AD736JR?
The AD736JR consumes a maximum of 200 μA of power supply current and operates at a power consumption of 1 mW.
- What are the operating temperature ranges for the AD736JR?
The AD736JR is available in different grades with operating temperature ranges of 0°C to +70°C (AD736J, AD736K) and −40°C to +85°C (AD736A, AD736B).
- In what packages is the AD736JR available?
The AD736JR is available in three low-cost, 8-lead packages: PDIP, SOIC, and CERDIP.
- Can the AD736JR be used in ac-coupled mode?
Yes, the AD736JR can be operated as an ac-coupled device by adding one external capacitor.
- What are some typical applications of the AD736JR?
The AD736JR is suitable for portable multimeters, handheld test equipment, medical devices, and other battery-powered applications requiring high accuracy and low power consumption.
- Does the AD736JR require external trims for specified accuracy?
No, the AD736JR does not require external trims for specified accuracy.
