TDA7326 データシートの表示（PDF） - STMicroelectronics

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TDA7326

AM-FM RADIO FREQUENCY SYNTHESIZER

STMicroelectronics 

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

OSC IN

PREDIVIDER

R

fref

PD

fsyn

TDA7326

AM IN

FM IN

MSB

REGISTER

PC7 .. PC0

REGISTER

SC5 .. SC0

COUNTER : C

D94AU102

3.4 REFERENCE FREQUENCY GENERATOR

TABLE 3.4

The crystal oscillator clock is divided by the

reference frequency divider to provide the ref-

AM/FM

fREF

erence frequency to the phase comparator.

0

0

Reference frequency divider range is select-

0

1

able by the programming bit ’fREF’.

Available reference frequency are shown in

1

0

following table.

1

1

Figure 4: Phase comparator

fREF (kHz)

12.5

25

1

2.5

7/16

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