Overview
The AD737ARZ, 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 its waveform. It is particularly suited for applications requiring high accuracy and low power consumption, making it ideal for battery-powered devices such as portable multimeters.
The AD737ARZ features high and low impedance input options, allowing it to handle a wide range of input signals. It operates over various temperature ranges and is available in compact 8-lead packages, including PDIP and SOIC_N.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Impedance (High-Z) | 10^12 | Ω |
| Input Impedance (Low-Z) | 8 kΩ | Ω |
| Maximum Error | ±0.2 mV ± 0.3% of reading | - |
| Power Supply Voltage Range | ±2.5 V to ±16.5 V | V |
| Quiescent Current | 160 μA | A |
| Standby Power Consumption | 125 μW | W |
| Operating Temperature Range (Commercial) | 0°C to 70°C | °C |
| Operating Temperature Range (Industrial) | −40°C to +85°C | °C |
| Package Types | PDIP, SOIC_N | - |
Key Features
- Computes the average rectified, absolute, or true rms value of a signal regardless of waveform.
- High and low impedance input options: high-Z FET input for high source impedance and low-Z input for wide dynamic range.
- No output buffer amplifier, reducing dc offset errors and making it compatible with high input impedance ADCs.
- Low power consumption: 160 μA quiescent current and 125 μW standby power consumption.
- High accuracy: ±0.2 mV ± 0.3% of reading with sine wave inputs.
- Single external component required for true rms measurement: an averaging capacitor.
- Ac-coupled input capability with input capacitor.
- Power-down mode with low standby current of 25 μA.
Applications
- Portable multimeters and other battery-powered measurement devices.
- Upgrading non-rms precision rectifiers in various applications.
- Measurement of ac and dc input voltages in industrial and commercial environments.
- Applications requiring high accuracy and low power consumption, such as in medical devices and automotive systems.
Q & A
- What is the primary function of the AD737ARZ?
The AD737ARZ computes the average rectified, absolute, or true rms value of a signal regardless of its waveform.
- What are the input impedance options for the AD737ARZ?
The AD737ARZ has both high impedance (10^12 Ω) and low impedance (8 kΩ) input options.
- What is the maximum error of the AD737ARZ?
The maximum error is ±0.2 mV ± 0.3% of reading with sine wave inputs.
- What is the power supply voltage range for the AD737ARZ?
The power supply voltage range is ±2.5 V to ±16.5 V.
- How much quiescent current does the AD737ARZ consume?
The quiescent current is 160 μA.
- What is the standby power consumption of the AD737ARZ?
The standby power consumption is 125 μW.
- What are the operating temperature ranges for the AD737ARZ?
The commercial temperature range is 0°C to 70°C, and the industrial temperature range is −40°C to +85°C.
- In what packages is the AD737ARZ available?
The AD737ARZ is available in 8-lead PDIP and SOIC_N packages.
- Does the AD737ARZ require an external buffer amplifier?
No, the AD737ARZ does not have an output buffer amplifier, which reduces dc offset errors.
- What external component is required for true rms measurement?
Only one external component, an averaging capacitor, is required for true rms measurement.
