PLL Tuning Circuit with I2C Bus

The MC44826 is a tuning circuit for TV and VCR tuner applications. It 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 circuit has a band decoder that provides the band switching signal for the mixer/oscillator circuit. The decoder is controlled by the buffer bits or independently by extra bits T6 and T7.

The MC44826 has a programmable 512/1024 reference divider and is manufactured on a single silicon chip using Motorola’s high density bipolar process, MOSAIC (Motorola Oxide Self Aligned Implanted Circuits).

• Complete Single Chip System for MPU Control (I2C Bus)

• Divide–by–8 Prescaler Accepts Frequencies up to 1.3 GHz

• 15 Bit Programmable Divider

• Reference Divider: Programmable for Division Ratios 512 and 1024

• 3–State Phase/Frequency Comparator

• Operational Amplifier for Direct Tuning Voltage Output (30 V)

• Four Programmable Chip Addresses

• Integrated Band Decoder for the Mixer/Oscillator Circuit

• Band Buffers with Low “On” Voltage (0.4 V Maximum at 15 mA)

• Fully ESD Protected to MIL–STD–883C, Method 3015.7 (2000 V, 1.5 kΩ, 150 pF)