LTC1562AIG

Overview

The LTC1562AIG is a very low noise, low distortion active RC quad universal filter manufactured by Analog Devices Inc. It features four independent second-order filter blocks capable of center frequencies from 10kHz to 150kHz. The A-grade variant provides a typical center frequency accuracy of -0.3%. It operates on single or dual supplies ranging from 4.75V to 10.5V total. Key electrical parameters include a typical signal-to-noise ratio of 97dB with a single 5V supply and 103dB with a -5V supply. Total harmonic distortion is typically -96dB at 20kHz input. The device utilizes a 20-lead plastic SSOP package.

Feature Summary

• Continuous-time architecture requiring no external clock signals
• Rail-to-rail input and output voltage capabilities
• Resistor-programmable center frequency, Q factor, and gain
• Zero-power shutdown mode for power conservation

Applications

• High resolution systems (14 bits to 18 bits)
• Antialiasing and reconstruction filters
• Data communications and equalizers
• Dual or I-and-Q channels using two matched 4th order filters in one package
• Linear phase filtering applications

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to confirm package type and temperature range. Confirm availability status as discontinued parts may require alternative sourcing strategies. Ensure the component meets RoHS compliance requirements if applicable to the target application environment.

Selection Notes

Select the LTC1562AIG when higher center frequency accuracy than the standard grade is required. Verify that the operating temperature range aligns with the industrial specifications. Consider the total supply voltage constraints and ensure the external resistor values fall within the recommended ranges to maintain optimal performance and dynamic range.

Part Context

The LTC1562 series represents a family of continuous-time filters designed to replace traditional LC modules and op-amp based active filters. The A-grade designation indicates tighter manufacturing tolerances for center frequency accuracy compared to the standard C or I grades. This component is part of Analog Devices' portfolio for precision analog signal processing.

Replacement Considerations

LTC1562CG

FAQ

How is the center frequency programmed?

The center frequency is set using external resistors R2 and RQ connected to the filter block.

What is the function of the SHDN pin?

The SHDN pin controls the zero-power shutdown mode; pulling it high disables the internal amplifiers.

Can the LTC1562 handle input voltages beyond the supply rails?

Yes, the virtual ground inputs allow the device to accommodate input voltage excursions beyond the power supplies without damage, provided outputs do not saturate.