CIRCUIT DESIGN STD-302 Manual de operação - Página 9

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PLL IC CONTROL

PLL IC control
Voltage Controled
Reference Oscillator
STD-302 is equipped with an internal PLL frequency synthesizer as shown in Figure 1. The operation of the
PLL circuit enables the VCO to oscillate at a stable frequency. Transmission frequency is set externally by the
controlling IC. STD-302 has control terminals (CLK, LE, DATA) for the PLL IC and the setting data is sent to
the internal register serially via the data line. Also STD-302 has a Lock Detect (LD) terminal that shows the
lock status of the frequency. These signal lines are connected directly to the PLL IC through a 2 kΩ resistor.
The interface voltage of STD-302 is 2.8 V, so the control voltage must be the same.
STD-302 comes equipped with a Fujitsu MB15E03SL PLL IC. Please refer to the manual of the PLL IC.
The following is a supplementary description related to operation with STD-302. In this description, the same
names and terminology as in the PLL IC manual are used, so please read the manual beforehand.
OG_STD-302-419M_v10e
up to 1200MHz
VCO
Oscillator
LPF
+2.8v
21.25MHz
Figure 1
Fin
CLK
Xf in
Data
GND
LE
PLL
Do
PS
MB15E03SL
VCC
ZC
Vp
LD/f out
OSCout
P
OSCin
R
9
OPERATION GUIDE
2kohm
CLK
2kohm
DATA
2kohm
LE
2kohm
LD
STD-302
Control pin name
#:Control v oltage = +2.8v
Circuit Design, Inc.
.