MC44871 Datasheet (Motorola) - PLL TUNING CIRCUIT

MC44871, PLL TUNING CIRCUIT

(see Figure 1) Pin 1 2 3, 4 5 6, 7, 8 9 10 11 12 13 14 15 16 Symbol VTUN CP HF1, HF2 Gnd B2, B1, B0 B4 ADC VCC ADD SDA SCL Xtal Amp In Description Operational amplifier output which provides the tuning voltage DC *DC Converter output (Charge Pump) Symmetrical HF inputs Ground PNP Band Buffer

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 amplif

MC44871 Features

* 3.0 mA sink I and 400 pF Load SDA/SCL Rise Time SCL Fall Time Pulse Width of Spikes Suppressed by the Input Filter 13 13 13, 14 13, 14 13,14 Tsp Pin 14

* Tbuf Tsu;sta Thd;sta Tsu;dat Thd;dat Tsu;sto Thd;sto Tack;low Symbol Min 0 20