LINEAR AN106-1 handbook

About this manual

The document introduces the LTC1966/LTC1967/LTC1968 device family, which features low-frequency accuracy within 0.5% and bandwidths extending to 500kHz or higher depending on the specific part. These converters utilize a sigma-delta based computational scheme to achieve high precision in measuring RMS amplitude of waveforms.

What's inside

• Introduction
• Device Family Overview
• Pinout Descriptions
• Basic Circuits
• Isolated Power Line Monitor
• SCR-Based AC/DC Converter
• Fully Isolated Wideband RMS-to-DC Converter
• Low Distortion AC Line Voltage Regulator

Specifications

Frequently asked questions

What is the accuracy of the RMS converters at low frequencies?

Low frequency accuracy, including linearity and gain error, is inside 0.5%.

What is the accuracy of the LTC1966/LTC1967/LTC1968 device family at bandwidths up to 500kHz?

The low frequency accuracy, including linearity and gain error, is inside 0.5% with a 1% error.

What input voltage range does the isolated power line monitor circuit in Figure 3 support?

The circuit has 0.5% accuracy over a sensed 90VAC to 130VAC input.

What is the maximum output voltage reading for the isolated RMS converter in Figure 7?

The converter senses either 135VAC or 270VAC full-scale inputs via a resistive divider.