LTC1569-7 Datasheet | Linear Technology

LTC1569-7 Linear Phase, DC Accurate, Tunable, 10th Order Lowpass Filter Features s s s s s s s s s s s U APPLICATIO S s s One External R Sets Cutoff Frequency Root Raised Cosine Response Up to 300k Hz Cutoff on a Single 5V Supply Up to 150k Hz Cutoff on a Single 3V Supply 10th Order, Linear Phase Filter in an SO-8 DC Accurate, VOS(MAX) = 5m V Low Power Modes Differential or Single-Ended Inputs 80d B CMRR (DC) 80d B Signal-to-Noise Ratio, VS = 5V Operates from 3V to ±5V Supplies Furthermore, its root raised cosine response offers the optimum pulse shaping for PAM data munications. The filter attenuation is 50d B at 1.5 - f CUTOFF, 60d B at 2 - f CUTOFF, and in excess of 80d B at 6 - f CUTOFF. DC-accuracysensitive applications benefit from the 5m V maximum DC offset. The LTC1569-7 is the first sampled data filter which 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 seven octaves. Alternatively, the cutoff frequency can be set with an external clock and the clock-to-cutoff frequency ratio is 32:1. The ratio of the internal sampling rate to the filter cutoff frequency is 64:1. The LTC1569-7 is fully tested for a cutoff frequency of 256k Hz/128k Hz with single 5V/3V supply although up to 300k Hz cutoff frequencies can be obtained. The LTC1569-7 Features power savings modes and it is available in an SO-8 surface mount package. , LTC and LT are registered trademarks of Linear Technology Corporation. s Data munication Filters for 3V Operation Linear Phase and Phase Matched Filters for I/Q Signal...