LTC6603 Datasheet | Linear Technology

LTC6603 Dual Adjustable Lowpass Filter .. Features n n n n n n n n n n n n DESCRIPTION The LTC®6603 is a dual, matched, programmable lowpass filter for munications receivers and transmitters. The selectivity of the LTC6603, bined with its linear phase, phase matching and dynamic range, make it suitable for filtering in many munications systems. With 1.5° phase matching between channels, the LTC6603 can be used in applications requiring pairs of matched filters, such as transceiver I and Q channels. Furthermore, the differential inputs and outputs provide a simple interface for most munications systems. The sampled data filter does not require an external clock yet its cutoff frequency can be set with a single external resistor with an accuracy of 3.5% or better. The external resistor programs an internal oscillator whose frequency is divided prior to being applied to the filter networks. This allows up to three cutoff frequencies that can be obtained for each external resistor value, allowing the cutoff frequency to be programmed over a range of more than six octaves. Alternatively, the cutoff frequency can be set with an external clock. The filter gain can also be programmed to 1, 2, 4 or 16. The LTC6603 Features a low power shutdown mode that can be programmed through the serial interface and is available in a 24-pin 4mm × 4mm QFN package. Guaranteed Phase and Gain Matching Specs Programmable BW Up to 2.5MHz Programmable Gain (0d B/6d B/12d B/24d B) 9th Order Linear Phase Response Differential, Rail-to-Rail Inputs and Outputs Low Noise: - 145d Bm/Hz (Input Referred) Low Distortion: - 75d Bc at 200k Hz Simple Pin Programming or SPI Interface Set the Max Speed/Power with an External R Operates from 2.7V to 3.6V Input Range from 0V to 5.5V 4mm × 4mm QFN Package APPLICATIONS n n n n Small/Low Cost Basestations: IDEN, PHS, TD-SCDMA, CDMA2000, WCDMA, UMTS Low Cost Repeaters, Radio Links, and Modems 802.11x Receivers JTRS L, LT, LTC and LTM are...