1993_Motorola_Linear_Interface_ICs_Vol_2.pdf

Video Circuits (continued)
PLL Tuning Circuit with DACs for Tuner Alignment
MC44810P Case 738
The MC44810 is a tuning circuit for TV applications. It
contains a PLL section and a DAC section and is MPU
controlled through the 12C bus.
The PLL section contains all the functions required to
control the VCO of a TV tuner. It generates the tuning voltage
and the additional control signals. The PLL section is
functionally equivalent to the MC44802A.
The DAC section generates three varactor voltages in
order to feed all of the tuner varactors with their individually
optimized control voltages (automatic tuner adjustment).
• Complete Single Chip System for MPU Control (12C Bus)
• Tri-State Phase/Frequency Comparator
Gnd
Clock
Data
HFln
• Selectable .;- 8 Prescaler accepts Frequencies up
to 1.3 GHz
• 15-Bit Programmable Reference Divider accepts
Frequencies up to 165 MHz
• Op Amp for Direct Tuning Voltage Output: 30 V
• Seven High Current Buffers: 10 mA, 12 V
• Output Options for 62.5 kHz, Reference Frequency
and Programmable Divider
• Software Compatible with the MC44802A
• Three 6-Bit DACs for Automatic Tuner Adjustment
Allowing use of Non-Matched Varactors
• 2-Chip Addresses for the PLL Section and
2 Different Chip Addresses for the DAC Section
VCC233 V
r-"-t----.,..=-t---H ----po--l
AMP 19
MOTOROLA LINEAR/INTERFACE ICs DEVICE DATA
9-19
Amp In