[Melexis]

Description

The device incorporates two matching 4th-order Butterworth filters with voltage gain control to perform low-pass filtering on quadrature demodulated signals. The cutoff frequency and inband gain are programmable via a standard 3-wire interface. The cutoff frequency can be set between 0.8 MHz and 22.4 MHz and the inband voltage gain can be set between -3 dB and 20 dB. The cutoff frequency value is determined via a 10-bit control word, with smaller step sizes in the lower portion of the cutoff frequency range.

Features

❐ Wide cutoff frequency range (0.8 MHz to 22.4 MHz)

❐ Dual-channel architecture produces superior matching and ease of use for quadrature signals

❐ Companding design provides higher resolution at lower cutoff frequencies

❐ Low power consumption (<105 mA, typical 55 mA from -5 V supply; Fc = 1 MHz @ 25°C)

❐ Single ended or differential input operation possible (AC coupled)

❐ No external components for trimming necessary

❐ Small package (16-pin SOP)

Applications

❐ Digital Broadcasting Systems (DBS) and Digital Video Broadcasting (DVB)

❐ Satellite and cable TV decoders

❐ Microwave point to point links