XC25BS5
Series
■Typical Application Circuits
q
Q1 Pin - reference oscillation, reference oscillation/2, comparative frequency.
Rq1
fCLKin
fQ1
1
V
DD
0.1μF
R1
6
5
4
XC25BS5
1
2
3
Rq0
fQ0
C1
w
Q1 Pin - GND
fCLKin
6
5
4
XC25BS5
V
DD
0.1μF
1
R1
C1
2
3
Rq0
fQ0
■Note:
(1) Please insert a by-pass capacitor of 0.1µF.
(2) Rq0 and Rq1 are matching resistors. Their use is recommended in order to counter unwanted radiations.
(3) Please place a by-pass capacitor and matching resistors as close to the IC as possible. It may be that the output cannot be locked if the
by-pass capacitor is not close enough to the IC. Further, there is a possibility of unwanted radiation occurance between the resistor and
the IC pin if the matching resistor is not close enough to the IC.
(4) When selecting GND for the Q1 pin, although the output of Q1 pin is GND level, it is also recommended that the Q1 pin is connected to
GND pattern on the PCB.
(5) When the CE pin is not controlled by external signals, it is recommended that a time constant circuit of R1=1kΩ
×
C0.1µF be added for
stability.
(6) With this IC, output is achieved by dividing and multiplying the reference oscillation by means of the PLL circuit. In cases where this
output is further used as a reference oscillation of another PLL circuit, it may be that the final output signal's jitter increases, so all
necessary precautions should be taken to avoid this.
(7) It is recommended that a low noise power supply, such as a series regulator, be used for the supply voltage. Using a power supply such
as a switching regulator might lead to a larger jitter which in turn may lead to an inability to lock due to the ripple of the switching
regulator.
100
TOREX [ TOREX SEMICONDUCTOR ]
