MB88151A Datasheet, PDF (5/22 Pages) Fujitsu Component Limited. – Spread Spectrum Clock Generator

■ BLOCK DIAGRAM
VDD
MB88151A
SEL1
SEL0
ENS/XPD
XOUT
Modulation rate
setting
Modulation rate
setting
Modulation enable setting/
Power down setting
Reference clock
PLL block
Modulation
clock output
CKOUT
XIN
Rf = 1 MΩ
VSS
1
−
M
Reference clock ¹
−
N
Phase
compare
Charge
pump
V/I
conversion
IDAC
Loop filter
ICO
Modulation clock
output
1
Modulation
−
L
Modulation logic
rate setting/
Modulation
enable setting
MB88151A PLL block
A glitchless IDAC (current output D/A converter) provides precise modulation,
thereby dramatically reducing EMI.
5