Overview
The AD737JRZ-5-R7, 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 ensure high accuracy, with a maximum error of ±0.2 mV ± 0.3% of reading for sine wave inputs. The AD737 is particularly suited for applications requiring high accuracy and low power consumption, making it ideal for battery-powered devices such as portable multimeters.
Key Specifications
| Parameter | Min | Typ | Max |
|---|---|---|---|
| Supply Voltage | ±2.5 V | ±16.5 V | |
| Input Resistance (High-Z FET Input) | 10^12 Ω | ||
| Input Resistance (Low-Z Input) | 6.4 kΩ | 8 kΩ | 9.6 kΩ |
| Input Bias Current | 1 pA | 25 pA | |
| Signal Range (Low-Z Input, Continuous RMS Level) | 300 mV rms | 1 V rms | |
| Error Bandwidth | 1% of reading | 10 kHz for 20 mV to 200 mV rms | |
| Power Consumption | 0.72 mW | ||
| Standby Power Consumption | 125 μW | ||
| Operating Temperature Range | -40°C (AD737A) | +85°C (AD737A) | |
| Package Type | 8-Lead SOIC |
Key Features
- Computes the average rectified, absolute, or true rms 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.
- Both high (10^12 Ω) and low impedance (8 kΩ) input options.
- Single-ended or differential input configurations.
- Requires only one external component, an averaging capacitor, for true rms measurement.
- Low power consumption: 160 μA supply current and 125 μW standby power consumption.
- No output buffer amplifier, reducing dc offset errors.
- Available in commercial and industrial temperature ranges.
Applications
The AD737JRZ-5-R7 is suitable for a variety of applications, including:
- Portable multimeters and other battery-powered measurement devices.
- Upgrading the performance of non-rms precision rectifiers.
- Measuring ac and dc input voltages with high accuracy.
- Applications requiring low power consumption and high accuracy, such as in industrial control systems and medical devices.
Q & A
- What is the primary function of the AD737JRZ-5-R7? The AD737JRZ-5-R7 computes the average rectified, absolute, or true rms value of a signal regardless of the waveform.
- What are the input impedance options for the AD737JRZ-5-R7? The device has both high (10^12 Ω) and low impedance (8 kΩ) input options.
- What is the maximum error for sine wave inputs? The maximum error is ±0.2 mV ± 0.3% of reading.
- How much power does the AD737JRZ-5-R7 consume? The device consumes 0.72 mW and has a standby power consumption of 125 μW.
- What are the operating temperature ranges for the AD737JRZ-5-R7? The AD737A grade operates over the industrial temperature range of -40°C to +85°C, while the AD737J and AD737K grades operate over the commercial temperature range of 0°C to 70°C.
- What package types are available for the AD737JRZ-5-R7? The device is available in 8-Lead SOIC packages.
- Can the AD737JRZ-5-R7 be used in battery-powered applications? Yes, it is highly suitable for battery-powered applications due to its low power consumption.
- Does the AD737JRZ-5-R7 require an output buffer amplifier? No, it does not require an output buffer amplifier, which reduces dc offset errors.
- How can the input signal be coupled to the AD737JRZ-5-R7? The input signal can be either dc-coupled or ac-coupled to the input amplifier.
- What is the minimum input signal level the AD737JRZ-5-R7 can resolve? The device can resolve input signal levels of 100 μV rms or less.
