6-Channel SD/ED/HD Video Filter with Charge Pump

The ADA4424-6 is a high performance video reconstruction filter specifically designed for consumer applications. It consists of a standard definition (SD) section with two fifth-order Butterworth filters, and a high definition (HD) section with three fifth-order filters. The SD section contains an internal Y/C summer for CVBS output, whereas the HD section provides selectable corner frequencies for either extended definition (ED) or HD signals.

The ADA4424-6 filter/buffer section operates from a single 3.3 V supply. Full support for D-terminal (EIAJ RC-5237 D5) and S1/S2 signaling is provided, along with a dedicated 5 V supply pin. Separate enable pins are provided for the SD and HD sections.

The luma channels (YIN, HYIN) of the ADA4424-6 are capable of detecting and cancelling dc input offsets of up to 1.1 V. Four distinct modes of detection/cancellation are available.

The output drivers on the ADA4424-6 feature rail-to-rail outputs with 6.2 dB gain. An on-board charge pump allows the outputs to swing up to 1.4 V below ground, eliminating the need for large coupling capacitors. Each output is capable of driving two 75 Ω doubly terminated cables.

The ADA4424-6 is available in a 38-lead TSSOP and operates in the extended industrial temperature range of −40°C to +85°C.

APPLICATIONS

* DVD players and recorders

* Set-top boxes

* Projectors

* Personal video recorders

* 3 SD channels; 18 MHz typical

1 dB bandwidth (BW)

* 3 ED/HD channels; 25 MHz/34 MHz typical 1 dB BW

* Fixed gain of 6.2 dB (2.042 V/V)

* Onboard negative supply for output coupling without capacitors

Minimal dc offset at the output pins

* Internal summation of Y and C channels for CVBS output