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LTC1569-6 - Linear Phase, DC Accurate, Low Power, 10th Order Lowpass Filter

The LTC1569-6 sampled data filter does not require an external clock yet its cutoff frequency can be set with a single external resistor with a typical accuracy of 3.5% or better. The external resistor programs an internal oscillator whose frequency is divided by either 1, 4 or 16 prior to being applied to the filter network. Pin 5 determines the divider setting. Thus, up to three cutoff frequencies can be obtained for each external resistor value. Using various resistor values and divider settings, the cutoff frequency can be programmed over a range of six octaves. Alternatively, the cutoff frequency can be set with an external clock and the clock-to-cutoff frequency ratio is 64:1. The ratio of the internal sampling rate to the filter cutoff frequency is 128:1.

The LTC1569-6 is fully tested for a cutoff frequency of 64kHz with a single 3V supply.

The LTC1569-6 features power saving modes and it is available in an SO-8 surface mount package.

Features One External R Sets Cutoff Frequency Root Raised Cosine Response 3mA Supply Current with a Single 3V Supply Up to 64kHz Cutoff on a Single 3V Supply 10th Order, Linear Phase Filter in an SO-8 DC Accurate, VOS(MAX) = 5mV Low Power Modes Differential or Single-Ended Inputs 80dB CMRR (DC) 82dB Signal-to-Noise Ratio, VS = 5V Operates from 3V to ±5V Supplies Typical Application

Applications Data Communication Filters for 3V Operation Linear Phase and Phase Matched Filters for I/Q Signal Processing Pin Programmable Cutoff Frequency Lowpass Filters Packaging

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