Overview
The AD737JRZ, produced by Analog Devices Inc., is a low power, precision, monolithic true rms-to-dc converter. This device is designed to compute the true rms value, average rectified value, or absolute value of a signal regardless of its waveform. It is laser trimmed to provide high accuracy, with a maximum error of ±0.2 mV ± 0.3% of reading for sine wave inputs. The AD737JRZ is particularly suited for applications requiring precise measurement of ac and dc input voltages, including variable duty cycle pulses and triac (phase) controlled sine waves.
Key Specifications
| Parameter | Min | Typ | Max |
|---|---|---|---|
| Supply Voltage | ±2.5 V | - | ±16.5 V |
| Supply Current | - | 160 µA | - |
| Standby Power Consumption | - | 125 µW | - |
| High-Z Input Impedance | 10^12 Ω | - | - |
| Low-Z Input Impedance | 6.4 kΩ | 8 kΩ | 9.6 kΩ |
| Low-Z Input Signal Range | - | 0.9 V rms (±2.5 V supply) | 1 V rms (±5 V to ±16.5 V supply) |
| Temperature Range (Commercial Grade) | 0°C | - | 70°C |
| Temperature Range (Industrial Grade) | -40°C | - | 85°C |
| Package Type | - | 8-Lead SOIC, 8-Lead PDIP | - |
Key Features
- Computes true rms, average rectified, or absolute value of a signal regardless of waveform.
- High accuracy with a maximum error of ±0.2 mV ± 0.3% of reading for sine wave inputs.
- Ultra-low power consumption at 160 µA supply current and standby power consumption of 125 µW.
- Wide supply voltage range from ±2.5 V to ±16.5 V.
- High input impedance (10^12 Ω) and low output impedance).
- Surface Mount 8-SOIC package for compact design).
- Requires only one external component, an averaging capacitor, for true rms measurement).
Applications
- Telecommunications
- Audio Equipment
- Test and Measurement Systems
- Industrial Controls
- Energy Management Systems
- Battery-powered devices and portable multimeters).
Q & A
- What is the primary function of the AD737JRZ?
The AD737JRZ is a true rms-to-dc converter that computes the true rms, average rectified, or absolute value of a signal regardless of its waveform).
- What is the maximum error of the AD737JRZ for sine wave inputs?
The maximum error is ±0.2 mV ± 0.3% of reading for sine wave inputs).
- What are the supply voltage and current requirements of the AD737JRZ?
The supply voltage range is from ±2.5 V to ±16.5 V, and the supply current is typically 160 µA).
- What types of input options does the AD737JRZ offer?
The AD737JRZ has both high impedance (10^12 Ω) and low impedance (8 kΩ) input options, which can be used either single-ended or differentially).
- What is the standby power consumption of the AD737JRZ?
The standby power consumption is typically 125 µW).
- In what packages is the AD737JRZ available?
The AD737JRZ is available in 8-Lead SOIC and 8-Lead PDIP packages).
- What are the temperature ranges for the different grades of the AD737JRZ?
The commercial grade (AD737J and AD737K) operates from 0°C to 70°C, and the industrial grade (AD737A) operates from -40°C to +85°C).
- What external components are required for true rms measurement?
Only one external component, an averaging capacitor, is required for true rms measurement).
- In which applications is the AD737JRZ particularly suitable?
The AD737JRZ is suitable for telecommunications, audio equipment, test and measurement systems, industrial controls, energy management systems, and battery-powered devices).
- Why is the AD737JRZ energy-efficient?
The AD737JRZ is energy-efficient due to its ultra-low power consumption, making it ideal for battery-powered applications).
