LTC1164-8 Datasheet | Linear Technology

LTC1164-8 Ultraselective, Low Power 8th Order Elliptic Bandpass Filter with Adjustable Gain Features s s s s s s DESCRIPTION The LTC®1164-8 is a monolithic ultraselective, 8th order, elliptic bandpass filter. The passband of the LTC1164-8 is tuned with an external clock and the clock-to-center frequency ratio is 100:1. The - 3d B pass bandwidth is typically 1% of the filter center frequency. The stopband attenuation of the LTC1164-8 is greater than 50d B. The lower and upper stopband frequencies are less than 0.96 - center frequency and greater than 1.04 - center frequency, respectively. The LTC1164-8 requires an external op amp and two external resistors (see the circuit below). The filter’s gain at center frequency is set by the ratio RIN /RF. For a gain equal to one and an optimum dynamic range, RF should be set to 61.9k and RIN should be 340k. For gains other than one, RIN = 340k/Gain. Gains up to 1000 are obtainable. Setting the filter’s gain with input resistor RIN does not increase the filter’s wideband noise. The 270µVRMS wideband noise of the LTC1164-8 is independent of the filter’s center frequency. The LTC1164-8 is available in a 14-pin PDIP or a 16-pin surface mount SO Wide package. , LTC and LT are registered trademarks of Linear Technology Corporation. s Ultraselectivity (50d B Attenuation at ± 4% of Center Frequency) Adjustable Passband Gain Noise Independent of Gain Filter Noise: 270µVRMS, VS = Single 5V Supply Clock-Tunable (Center Frequency = f CLK /100) Center Frequencies up to 5k Hz, VS = ± 5V (Typical ISUPPLY = 3.2m A) Center Frequencies up to 4k Hz, VS = Single 5V Supply (Typical ISUPPLY = 2.3m A) U APPLICATIONS s s s s Asynchronous Narrowband Signal Detectors Low Frequency Asynchronous Demodulators Handheld Spectrum Analyzers In-Band Tone Signaling Detectors TYPICAL APPLICATION Ultranarrow 1k Hz Bandpass Filter with Gain = 10 Gain = 340k/R IN, 1/(2π - RF - CF) ≥ 10 - Center Frequency RIN 34k VIN 5V 1 2 3 4 5 6 7 LTC1164-8 14 13 11 10 9 8 3...