Overview
The AD737JRZ-5-RL, produced by Analog Devices Inc., is a low power, precision, monolithic true rms-to-dc converter. This device is designed to compute the average rectified, absolute, or true rms value of a signal regardless of the waveform. It is laser trimmed to provide high accuracy, with a maximum error of ±0.2 mV or ±0.3% of reading for sine wave inputs. The AD737 is suitable for a wide range of applications, including those requiring high accuracy and low power consumption, such as portable multimeters and other battery-powered devices.
Key Specifications
| Parameter | Min | Typ | Max |
|---|---|---|---|
| Supply Voltage | ±2.5 V | - | ±16.5 V |
| Supply Current | - | 160 μA | - |
| Standby Supply Current | - | 25 μA | - |
| Input Resistance (High-Z FET Input) | 10^12 Ω | - | - |
| Input Resistance (Low-Z Input) | 6.4 kΩ | 8 kΩ | 9.6 kΩ |
| Signal Range (Low-Z Input) | - | 0.9 V rms | - |
| Temperature Range (Commercial Grade) | 0°C | - | 70°C |
| Temperature Range (Industrial Grade) | -40°C | - | 85°C |
| Package Type | - | 8-Lead SOIC | - |
Key Features
- Computes the average rectified, absolute, or true rms value of a signal regardless of waveform.
- Requires only one external component, an averaging capacitor, for true rms measurement.
- High accuracy with a maximum error of ±0.2 mV or ±0.3% of reading for sine wave inputs.
- Low power consumption: 160 μA supply current and 25 μA standby supply current.
- High and low impedance input options: high-Z FET input and low impedance (8 kΩ) input.
- Compatible with high input impedance ADCs due to the absence of an output buffer amplifier.
- Operates over a wide temperature range: commercial (0°C to 70°C) and industrial (-40°C to 85°C) grades.
Applications
- Portable multimeters and other battery-powered measurement devices due to its low power consumption.
- Upgrading the performance of non-rms precision rectifiers in various applications.
- AC and DC input voltage measurements, including variable duty cycle pulses and triac (phase) controlled sine waves.
- High accuracy measurement applications requiring true rms values, such as in audio and industrial control systems).
Q & A
- What is the primary function of the AD737JRZ-5-RL?
The AD737JRZ-5-RL is a true rms-to-dc converter that computes the average rectified, absolute, or true rms value of a signal regardless of the waveform).
- What are the supply voltage ranges for the AD737JRZ-5-RL?
The device operates with supply voltages ranging from ±2.5 V to ±16.5 V).
- What is the typical supply current of the AD737JRZ-5-RL?
The typical supply current is 160 μA).
- What are the input resistance options for the AD737JRZ-5-RL?
The device has both high impedance (10^12 Ω) FET input and low impedance (8 kΩ) input options).
- What is the temperature range for the industrial grade AD737?
The industrial grade AD737 operates over a temperature range of -40°C to 85°C).
- How many external components are required for true rms measurement?
Only one external component, an averaging capacitor, is required for true rms measurement).
- What is the standby power consumption of the AD737JRZ-5-RL?
The standby power consumption is typically 25 μA).
- What types of input signals can the AD737JRZ-5-RL handle?
The device can handle AC and DC input voltages, including variable duty cycle pulses and triac (phase) controlled sine waves).
- What is the package type of the AD737JRZ-5-RL?
The device is available in an 8-Lead SOIC package).
- Why is the AD737JRZ-5-RL suitable for battery-powered applications?
The device is suitable due to its low power consumption and low standby supply current, making it ideal for battery-powered applications).
