DESCRIPTION
Intended for analog and digital satellite STB receivers/SatTV, sets/PC cards, the LNBS21 is a monolithic voltage regulator and interface IC, assembled in PowerSO-20, specifically designed to provide the power and the 13/18V, 22KHz tone signalling to the LNB downconverter in the antenna or to the multiswitch box. In this application field, it offers a complete solution with extremely low component count, low power dissipation together with simple design and I2CTM standard interfacing.

■ COMPLETE INTERFACE BETWEEN LNB
    AND I2C™ BUS
■ BUILT-IN DC/DC CONTROLLER FOR
    SINGLE 12V SUPPLY OPERATION
■ ACCURATE BUILT-IN 22KHz TONE
    OSCILLATOR
■ SUITS WIDELY ACCEPTED STANDARDS
■ FAST OSCILLATOR START-UP FACILITATES
    DiSEqC™ ENCODING
■ BUILT-IN 22KHz TONE DETECTOR
    SUPPORTS BI-DIRECTIONAL DiSEqC™
■ LOOP-THROUGH FUNCTION FOR SLAVE
    OPERATION
■ LNB SHORT CIRCUIT PROTECTION AND
    DIAGNOSTIC
■ CABLE LENGTH DIGITAL COMPENSATION
■ INTERNAL OVER TEMPERATURE
    PROTECTION