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A7833
Selection Guide
General Description
A7833 is an integrated LNB down converter with pHEMT bias and polarization/tone detector. This device contains switched LO between 9.75GHz and 10.6GHz. With on chip VCO, PLL and Mixer, A7833 is a high integrated satellite down converter from Ku Band to L Band.

Additional unique features such as built-in 22KHz Tone Detector and Polar Voltage Selector, three channels of current programmable bias controller for negative voltage driven pHEMT. Such innovative features make this device be very useful to simplify system development and cost.

For crystal oscillator, A7833 just needs a common 25MHz crystal to generate 9.75GHz and 10.6GHz LO. User can also choose 25.35377 MHz for 10.75GHz satellite system. RF signal from pHEMT LNA is fed to A7833 RFIN (Pin 5), after internal mixer, IF is generated to Pin 9 (IFOUT) for Satellite Tuner such as STB (Set-Top-Box). Those functions are very easy to use while developing a LNB system. All features are integrated in a small QFN 4X4 24 pins package.
A7833 for dual LO (typical 10.6/9.75GHz).
11V ~ 21V operation (DC-DC buck inside).
Ku band to L band down converter.
Trimmable pHEMT bias current from 5mA to 25 mA.
Low current consumption 50mA (Include two FET 20mA current)
High integration
Integrated Ku band down-converter.
Integrated DCDC converter.
High accuracy polar voltage selector and 22KHz tone detector.
Integrated pHEMT bias controller.
Integrated switched LO between 9.75 GHz ~ 11.2GHz.
Support low cost crystal 25MHz
Ku Band LNB converter for digital satellite reception.
DVB-S satellite reception.
Datasheet
Application Note
Evaluation kit (EK)
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