LNBP21

LNBP21 LNBP SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE s s s s s s s s s s s COMPLETE INTERFACE BETWEEN LNB AND I2CTM 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 DiSEqCTM ENCODING BUILT-IN 22KHz TONE DETECTOR SUPPORTS BI-DIRECTIONAL DiSEqCTM LOOP-THROUGH FUNCTION FOR SLAVE OPERATION LNB SHORT CIRCUIT PROTECTION AND DIAGNOSTIC CABLE LENGTH DIGITAL COMPENSATION INTERNAL OVER TEMPERATURE PROTECTION ESD RATING 4KV ON POWER INPUT-OUTPUT PINS PowerSO-20 SO-20 DESCRIPTION Intended for analog and digital satellite STB receivers/SatTV, sets/PC cards, the LNBP21 is a monolithic voltage regulator and interface IC, assembled in SO-20 and PowerSO-20, specifically designed to provide the power and the 13/18V, 22KHz tone signalling to the LNB SCHEMATIC DIAGRAM Gate Sense Step-up Controller LNBP21 LT1 Feedback LT2 Vup Vcc Byp OUT Preregul.+ U.V.lockout +P.ON res. Enable I Select V Select Linear Post-reg +Modulator +Protections EXTM SDA SCL ADDR DSQIN I²C interf. 22KHz Oscill. Diagnostics DETIN Tone Detector DSQOUT October 2002 1/20 LNBP21 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 interfac-ing. This IC has a built in DC/DC step-up controller that, from...