Audio ASSP | LC72121MA
PLL Frequency Synthesizers for Electronic Tuning
概览
The LC72121MA are high input sensitivity (20 mVrms at 130 MHz) PLL frequency synthesizers for 3 V systems. These ICs are serial data compatible with the LC72131K/KMA, and feature the improved input sensitivity and lower spurious radiation (provided by a redesigned ground system) required in high-performance AM/FM tuners.
- High-speed programmable divider
FMIN: 10 to 160 MHz (Pulse swallower technique (With built-in divide-by-2 prescaler))
AMIN: 2 to 40 MHz (Pulse swallower technique)
0.5 to 10 MHz (Direct division technique) - IF counter
IFIN: 0.4 to 15MHz (For AM and FM IF counting) - Reference frequency :
One of 12 reference frequencies can be selected (using a 4.5 or 7.2 MHz crystal element)
1, 3, 5, 9, 10, 3.125, 6.25, 12.5, 15, 25, 50, and 100 kHz - Phase comparator :
Supports dead zone control.
Built-in unlocked state detection circuit
Built-in deadlock clear circuit
An MOS transistor for an active low-pass filter is built in - I/O ports :
Output-only ports: 4 pins
I/O ports: 2 pins
Supports the output of a clock time base signal. - Serial data I/O :
Support 'computer control bus' format communication with the system controller. - Operating ranges
Supply voltage: 2.7 to 3.6 V
Operating temperature: -40 to +85°C
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SOIC-24 W / MFP-24SJ
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PLL Frequency Synthesizer
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200
2.7
3.6
-40
85
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