Overview
The AD736ARZ-R7, produced by Analog Devices Inc., is a low power, precision, monolithic true rms-to-dc converter. This device is designed to convert an ac voltage waveform into a dc voltage, providing true rms, average rectified, or absolute value measurements. It is laser trimmed to ensure high accuracy, with a maximum error of ±0.3 mV ± 0.3% of reading for sine wave inputs. The AD736 is suitable for a wide range of applications, particularly in battery-powered devices due to its low power consumption of 1 mW and maximum supply current of 200 μA.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Range (full-scale) | 200 mV rms | 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 | mV, % |
| Crest Factor Capability | Up to 5 | - |
| Power Supply Range | +2.8 V, −3.2 V to ±16.5 V | V |
| Supply Current | 200 μA (maximum) | μA |
| Operating Temperature Range | −40°C to +85°C (industrial grade) | °C |
| Package Type | 8-SOIC | - |
Key Features
- Computes the true rms, average rectified, or absolute 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 using input attenuators.
- Low impedance input available for signals up to 300 mV rms, operating from low power supply voltages.
- Buffered voltage output with no external trims needed for specified accuracy.
- Available in industrial temperature range (−40°C to +85°C) and commercial temperature ranges.
Applications
The AD736 is widely used in various applications, including:
- Battery-powered multimeters and other portable measurement devices.
- Industrial control systems requiring precise measurement of ac signals.
- Audio and signal processing equipment where accurate rms measurements are necessary.
- Medical devices that require low power and high accuracy signal conversion.
- Automotive and aerospace systems where reliable and precise signal measurement is critical.
Q & A
- What is the primary function of the AD736?
The AD736 is a true rms-to-dc converter that converts an ac voltage waveform into a dc voltage, providing true rms, average rectified, or absolute value measurements.
- What is the maximum error of the AD736 for sine wave inputs?
The maximum error is ±0.3 mV ± 0.3% of reading.
- What is the input impedance of the AD736?
The input impedance is 10^12 Ω for the high impedance input.
- How much power does the AD736 consume?
The AD736 consumes a maximum of 200 μA supply current, resulting in a power consumption of 1 mW.
- What is the operating temperature range for the industrial grade AD736?
The operating temperature range is −40°C to +85°C for the industrial grade.
- What types of packages are available for the AD736?
The AD736 is available in 8-lead PDIP, SOIC, and CERDIP packages.
- Does the AD736 require external trims for specified accuracy?
No, the AD736 does not require external trims for specified accuracy.
- Can the AD736 measure signals with high crest factors?
Yes, the AD736 can measure signals with crest factors up to 5, introducing only 2.5% additional error at the 200 mV full-scale input level.
- How does the AD736 handle input signals with different amplitudes?
The AD736 can handle input signals from 20 mV rms to 200 mV rms with high accuracy and can also measure signals as low as 100 μV rms in ac-coupled mode.
- Is the AD736 suitable for battery-powered applications?
Yes, the AD736 is optimized for battery-powered applications due to its low power consumption.
