ZLNB2010

www.DataSheet4U.com ZLNB2006 ZLNB2009 DUAL TONE AND POLARITY SWITCH LNB MULTIPLEX CONTROLLER DEVICE DESCRIPTION The ZLNB2006/09/10 group of dual polarisation and tone switch controller are part of a wide range of satellite receiver LNB support circuits available from Zetex. Each part features two completely independent channels, each providing logic outputs to control LNB polarisation selection, local oscillator selection and the ZLNB2009/10 also provides downfeed disable. They are intended for use in Twin Universal and Quad LNBs, replacing many discrete components to save both manufacturing cost and PCB size whilst improving reliability. T h e tw o pol a ri s at i on c ont r ol i nput s o f t h e ZLNB2006/09/10 have a nominal threshold of 14.75V. The threshold is temperature compensated to minimise drift. Each features a low and stable input current that enables transient protection to be achieved with the addition of only a single resistor per channel. Multi Feed LNBs can be called to operate with one or more of their controlling receivers powered down/disconnected, with attendant cable mismatch problems. To ease design for this situation, each polarisation input of the ZLNB2009/10 has a second threshold set at 9.5V. An input voltage below this threshold indicates “receiver not present”, switching the relevant control channels high. This logic output can be used to disable the associated downfeed driver, eliminating any problems due to cable mismatch. ZLNB2010 Universal ...