3.4 REFERENCE FREQUENCY GENERATOR

The crystal oscillator clock is divided by the

reference frequency divider to provide the ref-

erence frequency to the phase comparator.

Reference frequency divider range is select-

Available reference frequency are shown in

following table.

PREDIVIDER

R

OSC IN

REGISTER

PC7 .. PC0

COUNTER : C

AM IN

FM IN

REGISTER

SC5 .. SC0

PD

fref

fsyn

D94AU102

MSB

Figure 3: AM direct mode operation for SW, MW and LW

Figure 4: Phase comparator

AM/FM

0

0

12.5

01

25

10

1

1

1

2.5

TABLE 3.4

TDA7326

7/16