AV9107C 데이터 시트보기 (PDF) - Integrated Device Technology

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AV9107C

CPU Frequency Generator

Integrated Device Technology 

AV9107C

Frequency Accuracy and Calculation

The accuracy of the frequencies produced by the AV9107C-

07 depends on the input frequency and the desired actual

output frequency. The formula for calculating the exact

frequency is as follows:

Output Frequency = Input Frequency ∞

A

B

where A=2, 3, 4 ... 128, and

B=2, 3, 4 ... 32.

For example, to calculate the actual output frequency for a

video monitor expecting a 44.900 MHz clock and using a

14.318 MHz input clock, the closest A/B ratio is 69/22,

which gives an output of 44.906 MHz (within 0.02% of the

target frequency). Generally, the AV9107C-07 can produce

frequencies within 0.1% of the desired output.

Allowable Input and Output

Frequencies for Possible Options

The input frequency should be between 2 and 32 MHz,

depending on options, and the A/B ratio should not exceed

24. The output should fall in the range of 2-120 MHz,

depending on options.

Output Enable

The Output Enable feature tristates the specified output

clock pins. This places the selected output pins in a high

impedance state to allow for system level diagnostic testing.

Power-Down

If equipped, the power-down shuts off the specified PLL or

entire chip to save current. A few milliseconds are required

to reach full functioning speed from a power-down state.

Frequency Transitions

A key AV9107C-07 feature is the ability to provide glitch-

free frequency transitions across its output frequency range.

The AV9107C-07-03 provides smooth transitions between

any of the two groups of eight frequencies (when FS3=0 or

FS3=1), so that the device will switch glitch-free between

4-100 MHz and 2-50 MHz.

Slow Clock

If equipped, the Slow Clock forces a smooth frequency

transition on the VCO to an 8 MHz output on CLK1 when

Slow Clock is taken to logic low level. A few milliseconds

are required for the frequency transition into and out of the

Slow Clock Mode.

Absolute Maximum Ratings

AVDD, VDD referenced to GND ........................................................................................................................................... 7V

Operating temperature under bias ........................................................................................................................ 0°C to +70°C

Storage temperature ......................................................................................................................................... -65°C to +150°C

Voltage on I/O pins referenced to GND ........................................................................................ GND -0.5V to VDD +0.5V

Power dissipation .......................................................................................................................................................... 0.5 Watts

Stresses above those listed underAbsolute Maximum Ratings may cause permanent damage to the device.This is a stress rating

only and functional operation of the device at these or any other conditions above those indicated in the operational sections of

the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product

reliability.

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