■ DESCRIPTION

MB88156 is a clock generator for EMI (Electro Magnetic Interference) reduction. The peak of unnecessary radiation noise (EMI) can be attenuated by making the oscillation frequency slightly modulate periodically with the internal modulator. The modulation corresponds to the center spread and down spread. The multiplication ratio can be changed by the pin setting.

■ FEATURES

• Input frequency : 12.5 MHz to 50 MHz (multiplied by 1)

12.5 MHz to 25 MHz (multiplied by 2)

12.5 MHz to 20 MHz (multiplied by 4)

• Output frequency : CKOUT 12.5 MHz to 80 MHz

REFOUT the same as input frequency (not multiplied)

• Modulation rate : ±0.5, ±1.0 (center spread) , −1.0, −2.0 (down spread)

• Frequency down function : −0.5, −1.0 (for down-non-spread)

• Equipped with oscillation circuit : Oscillation range 12.5 MHz to 40 MHz (Fundamental oscillation mode)

40 MHz to 48 MHz (At 3rd over tone)

• Modulation clock output Duty : 40 to 60

• Modulation clock Cycle-Cycle Jitter : Multiplied by 1 (input) 12.5 MHz to 20 MHz less than 150 ps

Multiplied by 1 (input) 20.0 MHz to 50 MHz less than 100 ps

Multiplied by 2 (input) 12.5 MHz to 25 MHz less than 200 ps

Multiplied by 4 (input) 12.5 MHz to 20 MHz less than 200 ps

• Low current consumption by CMOS process : 5 mA (24 MHz : Typ-sample, no load)

• Power supply voltage : 3.3 V ± 0.3 V

• Operating temperature : −40 °C to +85 °C

• Package : BCC 16-pin