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TUA6020 Datasheet(PDF) 7 Page - Infineon Technologies AG |
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TUA6020 Datasheet(HTML) 7 Page - Infineon Technologies AG |
7 / 39 page Product Description 2 - 2 TUA6020 targetpreliminary Wireless Components Specification, April 2000 2.1 General Description The TUA6020 device combines a digitally programmable phase locked loop (PLL), with a mixer-oscillator block including two balanced mixers and oscilla- tors for use in TV and VCR tuners. The PLL block with four selectable chip addresses forms a digitally programma- ble phase locked loop. With a 4 MHz quartz crystal, the PLL permits precise set- ting of the frequency of the tuner oscillator up to 1024 MHz in increments of 31.25, 50, 62.5 or 166.7 kHz. The tuning process is controlled by a micropro- cessor via an I2C bus. The device has three output ports. A flag is set when the loop is locked. It can be read by the processor via the I2C bus. The mixer-oscillator block includes two balanced mixers (one mixer with high- impedance input and one mixer with a balanced low-impedance input), two fre- quency and amplitude-stable balanced oscillators for LOW/MID and HIGH, an IF amplifier, a low-noise reference voltage source, and a band switch. 2.2 Features General Suitable for analog and digital terrestrial TV tuner Full ESD protection Mixer/Oscillator High impedance mixer input for LOW/MID band Low impedance mixer input for HIGH band 4 pin oscillator for LOW/MID band 4 pin oscillator for HIGH band IF-Amplifier balanced SAW preamplifier Low output impedance PLL PLL with short lock-in time High voltage VCO tuning output Fast I2C bus 3 NPN bandswitch buffers Internal LOW-MID/HIGH switch Lock-in flag Power-down reset |
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