CIRCUIT DESIGN STD-302N-R Посібник з експлуатації - Сторінка 10

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PLL IC CONTROL



PLL IC control

Voltage Controled

Reference Oscillator

STD-302N-R 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-302N-R 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-302N-R 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-302N-R is 2.8 V, so the control voltage must be the same.

STD-302N-R 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-302N-R. In this description, the

same names and terminology as in the PLL IC manual are used, so please read the manual beforehand.

OG_STD-302N-R-335M_v10e

up to 1200MHz

VCO

Oscillator

LPF

+2.8v

21.25MHz

Figure 1

Fin

CLK

Xf in

Data

GND

PLL

MB15E03SL

VCC

LD/f out

OSCout

OSCin

OPERATION GUIDE

2kohm

CLK

2kohm

DATA

2kohm

STD-302

Control pin name

#:Control v oltage = +2.8v

Circuit Design, Inc.