LTC1564CG#TRPBF

Overview

The LTC1564 is a digitally controlled continuous-time lowpass filter and programmable gain amplifier (PGA) designed for antialiasing and reconstruction applications. It features an 8th-order elliptic response with two stopband notches, providing approximately 100dB attenuation at 2.5 times the cutoff frequency ($f_C$). The cutoff frequency is adjustable from 10kHz to 150kHz in 10kHz steps via four digital inputs. The integrated PGA offers gains from 1V/V to 16V/V in 1V/V increments. Operating on a total supply voltage of 2.7V to 10V, it delivers a typical dynamic range of 122dB with rail-to-rail input and output swing.

Feature Summary

• Digitally controlled 8th-order lowpass filter with fixed elliptic response shape
• Integrated 4-bit programmable gain amplifier with linear amplitude control
• Rail-to-rail analog input and output capability
• Latching digital interface for storing frequency and gain settings

Applications

• Antialiasing or reconstruction filtering for data acquisition systems
• DSP front ends requiring high stopband rejection
• Processing signals buried in noise with variable gain normalization
• Scientific instruments and communications systems

Procurement Notes

Verify the specific ordering suffix against manufacturer documentation to confirm package type and lead-free status. The standard plastic SSOP package is available in tape and reel options. Confirm that the selected variant matches the required operating temperature range for the intended application environment before finalizing procurement.

Selection Notes

Select this component when a single-chip solution for band-limiting and signal conditioning is required. Ensure the system power supply supports the 2.7V to 10V total range. Verify that the digital control logic levels are compatible with the CMOS inputs. Consider the input impedance variation with gain settings when interfacing with source circuits.

Part Context

This device belongs to the Analog Devices LTC1564 family of low-noise programmable filters. It serves as a self-contained active filter solution that eliminates the need for external passive components or complex filter design expertise. The part integrates both the filtering stage and the variable gain amplifier into a single 16-lead SSOP package.

Replacement Considerations

Public confirmed substitute part numbers: None identified.