U6101B

U6101B IF System and I/Q Demodulator for Digital Satellite TV Transmissions Description The U6101B is a monolithic integrated circuit in TEMIC’s UHF 5 technology for Satellite Digital Video Broadcasting (DVBS) and other digital direct satellite service applications. The circuit operates in a wide frequency range and in a large input level range. Implemented are two orthogonal mixer stages (precise phase-matched by a control loop), a gain-controlled IF amplifier of high input sensitivity with two switchable isolated inputs, and an AGC-system for tuner and IF level control. Alternatively the output level may be controlled automatically, e.g., via the channel decoder AGC signal output. The local oscillator operates at IF input frequency. The oscillator signal is internally doubled and divided again to generate the orthogonal mixer driving signals. Features D Frequency range from 390 to 520 MHz D Two unbalanced switchable inputs D High I/Q phase accuracy, based on TEMIC’s patented 0°/90° control loop circuit D Input impedance 50 Ω, gain independent D High input sensitivity www.DataSheet4U.com Benefits D Two switchable IF-inputs to connect a combined SAW filter D Oscillator for SAW or LC tank circuit D Adjustable tuner AGC control D Low impedance output driver D Balanced prescaler output D Output signal level adjustable or fixed at typical or minimum data sheet value by pin programming D Low power consumption, 5-V supply voltage D AGC control range –35 dB D Internal AGC detecto...