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LNBS21 Datasheet(PDF) 1 Page - STMicroelectronics |
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LNBS21 Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 21 page  1/21 October 2004 s COMPLETE INTERFACE BETWEEN LNB AND I2CTM BUS s BUILT-IN DC/DC CONTROLLER FOR SINGLE 12V SUPPLY OPERATION s ACCURATE BUILT-IN 22KHz TONE OSCILLATOR s SUITS WIDELY ACCEPTED STANDARDS s FAST OSCILLATOR START-UP FACILITATES DiSEqCTM ENCODING s BUILT-IN 22KHz TONE DETECTOR SUPPORTS BI-DIRECTIONAL DiSEqCTM s LOOP-THROUGH FUNCTION FOR SLAVE OPERATION s LNB SHORT CIRCUIT PROTECTION AND DIAGNOSTIC s CABLE LENGTH DIGITAL COMPENSATION s INTERNAL OVER TEMPERATURE PROTECTION 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. This IC has a built in DC/DC step-up controller that, from a single supply source ranging from 8 to 15V, generates the voltages that let the linear LNBS21 LNB SUPPLY AND CONTROL IC WITH STEP-UP CONVERTER AND I2C INTERFACE Enable I Select Preregul.+ U.V.lockout +P.ON res. Feedback Step-up Controller V Select Linear Post-reg +Modulator +Protections 22KHz Oscill. Vup LT1 OUT SDA SCL DSQIN Vcc Diagnostics I²C interf. Tone Detector DSQOUT LT2 DETIN LNBS21 Byp Gate Sense EXTM ADDR Figure 1: Schematic Diagram PowerSO-20 Rev. 3 |
Similar Part No. - LNBS21 |
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Similar Description - LNBS21 |
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