Overview
The AD736BRZ-RL, 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 AD736BRZ-RL is particularly suited for battery-powered applications due to its low power consumption of 200 μA and wide power supply range from +2.8 V, −3.2 V to ±16.5 V.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Range | 200 mV rms (full-scale) | mV rms |
| Input Impedance | 10^12 Ω (high impedance 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 | Up to 5 | - |
| 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 Type | 8-Lead SOIC | - |
Key Features
- Computes the true rms, average rectified, or absolute value of 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 (10^12 Ω) eliminates the need for an external buffer when interfacing with input attenuators.
- Low impedance input (8 kΩ) for measuring input signals up to 300 mV rms at low power supply voltages.
- Integrated output buffer amplifier for design flexibility.
- Operates as an ac-coupled device with the addition of one external capacitor, resolving input signal levels of 100 μV rms or less.
Applications
The AD736BRZ-RL is optimized for use in various applications, including:
- Portable multimeters and other battery-powered measurement devices.
- Signal conditioning circuits where high accuracy and low power consumption are critical.
- Upgrading the performance of non-rms precision rectifiers in existing designs.
- Measuring ac and dc input voltages in industrial and commercial environments.
Q & A
- What is the primary function of the AD736BRZ-RL?
The AD736BRZ-RL 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 input range of the AD736BRZ-RL?
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 AD736BRZ-RL?
The device has a high impedance FET input (10^12 Ω) and a low impedance input (8 kΩ). - How accurate is the AD736BRZ-RL?
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 AD736BRZ-RL?
The power supply range is from +2.8 V, −3.2 V to ±16.5 V. - How much power does the AD736BRZ-RL consume?
The device consumes a maximum of 200 μA of power supply current. - What types of packages are available for the AD736BRZ-RL?
The AD736BRZ-RL is available in an 8-Lead SOIC package. - What is the operating temperature range for the AD736BRZ-RL?
The operating temperature range is −40°C to +85°C for the industrial grade. - Can the AD736BRZ-RL measure high crest factor signals?
Yes, it can measure signals with crest factors up to 5, introducing only 2.5% additional error at the 200 mV full-scale input level. - Is an external buffer required for the high impedance input?
No, the high input impedance (10^12 Ω) eliminates the need for an external buffer when interfacing with input attenuators.
