MC44871

Order this document by MC44871/D MC44871 Advance Information PLL Tuning Circuit with DC-DC Converter, I2C Bus and ADC The MC44871 is a tuning circuit for TV, VCR and Multimedia tuner applications. This device contains on one chip all the functions required for PLL control of a VCO. This integrated circuit also contains a high frequency prescaler and thus can handle frequencies up to 1.3 GHz. The MC44871 has an integrated dc/dc converter to generate the 30 V supply voltage for the tuning amplifier on the chip. A tuner using the MC44871 does not require an external 30 V supply. The MC44871 is controlled by a I2C bus, and has a chip address function. The MC44871 data format is the same as the MC44818. The MC44871 is manufactured on a single silicon chip using Motorola’s high density bipolar process, MOSAIC™ (Motorola Oxide Self Aligned Implanted Circuits). PLL TUNING CIRCUIT WITH HIGH SPEED I2C BUS AND 30 V TUNING SUPPLY SEMICONDUCTOR TECHNICAL DATA The Pin Called VCC2 for the MC44818 is Now Called CP (Charge Pump). This Pin is the Output of the DC/DC Converter; a 1.0 nF Capacitor Replaces the Need for an External 30 V Supply High Speed I2C Bus (up to 800 kHz) I2C Bus Read Mode for Lock Detector and AFC Level HF Input is Balanced MC44871 has Three PNP High Current (30 mA) Band Buffers (B0, B1, B2) and One NPN Low Current (5.0 mA) Band Buffer (B4) VCC Internally Supplies PNP Band Buffers The Tuning Voltage is Generated Through an External Pull–Up Resistor (...