Overview
The AD736JRZ, 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 AD736JRZ 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 | 10^12 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 (with 2.5% additional error at 200 mV full-scale) | - |
| Power Supply Range | +2.8 V, -3.2 V to ±16.5 V | V |
| Quiescent Current | 160 μA to 200 μA | μA |
| Operating Temperature Range | 0°C to +70°C (commercial), -40°C to +85°C (industrial) | °C |
| Package Types | PDIP, SOIC, CERDIP | - |
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 eliminates the need for an external buffer when interfacing with input attenuators.
- Low impedance input available for measuring up to 300 mV rms input levels from low power supply voltages.
- Buffered voltage output provides design flexibility.
- No external trims needed for specified accuracy.
Applications
The AD736JRZ 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 existing circuits.
- Measuring AC and DC input voltages with high accuracy, including variable duty-cycle pulses and triac (phase)-controlled sine waves.
- Applications requiring low power consumption and high input impedance.
Q & A
- What is the primary function of the AD736JRZ?
The AD736JRZ 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 AD736JRZ?
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 AD736JRZ?
The device has a high impedance FET input (10^12 Ω) and a low impedance input (8 kΩ).
- How accurate is the AD736JRZ?
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 AD736JRZ?
The power supply range is +2.8 V, -3.2 V to ±16.5 V.
- What is the typical quiescent current of the AD736JRZ?
The typical quiescent current is between 160 μA and 200 μA.
- What are the operating temperature ranges for the AD736JRZ?
The device operates over 0°C to +70°C (commercial) and -40°C to +85°C (industrial) temperature ranges.
- In what packages is the AD736JRZ available?
The AD736JRZ is available in PDIP, SOIC, and CERDIP packages.
- What external components are required for true rms measurement?
Only one external component, an averaging capacitor, is required for true rms measurement.
- Is the AD736JRZ suitable for battery-powered applications?
Yes, the device is optimized for battery-powered applications due to its low power consumption of 1 mW.
