Overview
The AD736BR-REEL7, produced by Analog Devices Inc., is a low power, precision, monolithic true rms-to-dc converter. This component is designed to compute the rms value of both ac and dc input voltages with high accuracy and low power consumption. It can operate as either an average responding converter or a true rms-to-dc converter, making it versatile for various measurement applications. The AD736BR-REEL7 is particularly suited for battery-powered devices such as portable multimeters due to its low power requirements of 200 μA and a power consumption of 1 mW.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Full-Scale Input Range | 200 mV rms | - |
| Input Impedance | 10^12 Ω (high impedance input) | Ω |
| Input Bias Current | 25 pA (maximum) | pA |
| Accuracy | ±0.3 mV ± 0.3% of reading | - |
| Crest Factor Capability | 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 | −40°C to +85°C (industrial grade) | °C |
| Package Types | PDIP, SOIC, CERDIP | - |
Key Features
- Computes the average rectified value, absolute value, or true rms value of various input signals.
- Requires only one external component, an averaging capacitor, for true rms measurement.
- Low power consumption of 1 mW, making it suitable for battery-powered applications.
- High input impedance of 10^12 Ω, eliminating the need for an external buffer when interfacing with input attenuators.
- Low impedance input available for applications requiring input signals up to 300 mV rms from low power supply voltages.
- No external trims needed for specified accuracy.
- Includes an output buffer amplifier for design flexibility.
Applications
The AD736BR-REEL7 is optimized for use in various applications, including:
- Portable multimeters and other battery-powered measurement devices.
- Ac-coupled measurements by adding an external capacitor, allowing resolution of input signal levels as low as 100 μV rms.
- High accuracy measurements in environments with variations in temperature or supply voltage.
- Applications requiring the measurement of ac signals with crest factors up to 5.
Q & A
- What is the primary function of the AD736BR-REEL7?
The AD736BR-REEL7 is a true rms-to-dc converter that computes the rms value of both ac and dc input voltages.
- What is the full-scale input range of the AD736BR-REEL7?
The full-scale input range is 200 mV rms.
- What is the input impedance of the AD736BR-REEL7?
The input impedance is 10^12 Ω for the high impedance input.
- How much power does the AD736BR-REEL7 consume?
The AD736BR-REEL7 consumes 1 mW of power and requires a maximum supply current of 200 μA.
- What are the temperature ranges for the AD736BR-REEL7?
The industrial grade AD736BR-REEL7 is rated over the −40°C to +85°C temperature range.
- What types of packages are available for the AD736BR-REEL7?
The AD736BR-REEL7 is available in PDIP, SOIC, and CERDIP packages.
- Can the AD736BR-REEL7 measure ac signals with high crest factors?
Yes, the AD736BR-REEL7 can measure ac signals with crest factors up to 5, introducing only 2.5% additional error at the 200 mV full-scale input level.
- Does the AD736BR-REEL7 require external trims for accuracy?
No, the AD736BR-REEL7 does not require external trims for specified accuracy.
- How does the AD736BR-REEL7 handle output ripple?
The AD736BR-REEL7 uses an external averaging capacitor and an optional low-pass filter to reduce output ripple.
- Can the AD736BR-REEL7 be used in ac-coupled mode?
Yes, the AD736BR-REEL7 can be operated as an ac-coupled device by adding one external capacitor.
- What are some typical applications for the AD736BR-REEL7?
Typical applications include portable multimeters, battery-powered measurement devices, and high accuracy measurements in varying environmental conditions.
