TDA7427A_02 查看數據表（PDF） - STMicroelectronics

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TDA7427A_02

AM-FM RADIO FREQUENCY SYNTHESIZER AND IF COUNTER

STMicroelectronics 

Figure 1. FM and AM (SW) operation (swallow mode)

OSC IN

REGISTER

R0 ...R15

PREDIVIDER

:R

fref

PD

fsyn

TDA7427A

∆ϕ

TO CHARGE

PUMP

AM IN

FM IN

REGISTER

PC0 ...PC4

COUNTER

A

PRESCALER

M/M+1

REGISTER

PC5 ... P15

COUNTER

:B

D95AU375A

Table 2. Control Register Functions.

REGISTER NAME

PC

RC

IRC

IFCM

EW

IFENA

CF

IFS

PM

D

LPIN1/2

PLLSTOP

A

B

LDENA

CURRH

OSC

DOUT1

DOUT2....6

INLOCK

FUNCTION

Programmable counter for VCO frequency

Reference counter PLL

Reference counter IF

IF counter mode selector

Frequency error window IF counter

Enable IFRC

Center frequency IF counter

Sampling time IF counter

Stby, FM, AM, AM swallow mode selector

Programmable delay and phase error for lock detector

Loop filter input select

PLL stop

Charge pump high current

Charge pump low current

Lock detector enable

Set current high

Oscillator adjust

Push pull output 5V

Open collector output

Lock detector output

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