CIRCUIT DESIGN LMD-400-R Kullanım Kılavuzu - Sayfa 10

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PLL IC CONTROL

PLL IC control

up to 1200MHz

VCO

Voltage Controled

Oscillator

LPF

Reference Oscillator

TCXO

21.25MHz

LMD-400-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. LMD-400-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 LMD-400-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 k

resistor.

The interface voltage of LMD-400-R is 2.8 V, so the control voltage must be the same.

LMD-400-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 LMD-400-R. In this description, the

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

OG_LMD-400-R-AB_v11e

Figure 1

Fin

Xf in

GND

PLL

MB15E03SL

+2.8v

VCC

OSCout

OSCin

2kohm

CLK

2kohm

Data

2kohm

LD/f out

#:Control v oltage = +2.8v

OPERATION GUIDE

CLK

DATA

STD-302

Control pin name

Circuit Design, Inc.