MB88161 데이터 시트보기 (PDF) - Fujitsu

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MB88161

Spread Spectrum Clock Generator

Fujitsu 

MB88161

■ PIN SETTING

After the pin setting is changed, the stabilization wait time of the modulation clock is required. The stabilization

wait time of the modulation clock takes the maximum value of Lock-Up time in “• AC Characteristics” in

■ ELECTRICAL CHARACTERISTICS.

Each setting pin contains the pull-up resistor or pull-down resistor. Therefore, these pins is set to default state

for input opened.

MLTP multiplication setting

MLTP

Multiplication rate

L

Multiplied by 1

H

Multiplied by 2

Input Frequency

20 MHz to 28 MHz

14 MHz to 40 MHz

Output Frequency

20 MHz to 28 MHz

28 MHz to 80 MHz

Note : Set MLTP pin to “L” for input opened because MLTP pin has the pull-down resistor.

Remarks

Default

⎯

OE clock output enable

OE

Status

L

Modulation clock output (OUT pin) Hi-Z/Power down status

H

Operation status

Remarks

⎯

Default

Note : When OE pin is set to “L”, all oscillation circuits/PLL stop and enter power down mode, low-power consump-

tion mode. Modulation clock output (OUT pin) becomes Hi-Z state during the power down. Set OE pin to “H”

for input opened because OE pin has the pull-up resistor.

SPRD modulation type setting

SPRD

L

H

Modulation type

Down spread

Center spread

Note : Set SPRD pin to “H” for input opened because SPRD pin has the pull-up resistor.

Remarks

⎯

Default

S0/S1 modulation rate setting

S1

S0

Modulation rate

At down spread

At center spread

L

L

No modulation

No modulation

L

H

− 1.0%

± 0.5%

H

L

− 4.0%

± 2.0%

H

H

− 2.0%

± 1.0%

Remarks

⎯

⎯

⎯

Default

Note : Set S1 pin and S0 pin to “H” for input opened because S1 pin and S0 pin have the pull-up resistor.

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