DESCRIPTION
Intended for analog and digital satellite receivers, In order to reduce the power dissipation of the device when the lowest output voltage is selected, the regulator has 2 supply inputs (VCC1 and VCC2). The TONE pin (only for the LNBP9 version) activates the internal oscillator so that the DC output is modulated by a 22KHz square wave. This internal oscillator is factory trimmed within a Table 1: Order Codes TYPE LNBP8 LNBP9 tolerance of +/- 2KHz, thus no further adjustment or external components are required. A burst coding of the 22KHz tone can be accomplished thanks to the fast response of the TONE input and the prompt oscillator start-up. This helps designers which want to implement the DiSEqCTM protocols. In order to improve design flexibility and to allow implementation of other LNB remote control standards, an analogic modulation input pin (EXTM) is available (LNBP8 version only). An appropriate DC blocking capacitor must be used to couple the modulating signal source to the EXTM pin.
STMicroelectronics
