ML6421

September 1999 ML6421* Triple Phase and Sinx/x Equalized, Low-Pass Video Filter GENERAL DESCRIPTION The ML6421 monolithic BiCMOS 6th-order filter provides fixed frequency low pass filtering for video applications. This triple phase-equalized filter with Sinx/x correction is designed for reconstruction filtering at the output of a Video DAC. Cut-off frequencies are either 5.5, 8.0, or 3.0MHz. Each channel incorporates a 6th-order lowpass filter, a first order all-pass filter, a gain boost circuit, and a 75Ω coax cable driver. A control pin (Range) is provided to allow the inputs to swing from 0 to 1V, or 0.5 to 1.5V, by providing a 0.5V offset to the input. The unity gain filters are powered from a single 5V supply, and can drive 1VP-P over 75Ω (0.5V to 1.5V), or 2VP-P over 150Ω (0.5V to 2.5V) with the internal coax drivers. FEATURES s s s s s s 5.5, 8.0, 9.3, or 3.0MHz bandwidth 1x or 2x gain 6th-order filter with phase and amplitude equalizer >40dB stopband rejection No external components or clocks ±10% frequency accuracy over maximum supply and temperature variation <2% differential gain <2° differential phase <25ns group delay variation Drives 1VP-P into 75Ω, or 2VP-P into 150Ω 5V ±10% operation *Some Packages Are Obsolete s s s s BLOCK DIAGRAM VCCB 8 VCCC 6 VCC 5 VCCA 11 VINA 15 3kΩ BUF LOW PASS FILTER A ALL PASS FILTER SINX/X EQUALIZER 1X/2X BUF 10 VOUTA 3.33kΩ IBIAS 1kΩ VINB 16 3kΩ BUF LOW PASS FILTER B ALL PASS FILTER SINX/X EQUALIZER 1X/2X BUF ...