TEF6621T データシートの表示（PDF） - NXP Semiconductors.

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TEF6621T

Tuner on main-board IC

NXP Semiconductors. 

TEF6621 NXP

Semiconductors

Table 3.

Symbol

SDA

VREF

VREGSUP

VCC1

Pin

description

Pin

19

20

21

22

…continued

Description

I2C-bus data input and output

reference voltage decoupling

supply voltage internal voltage

supply voltage 1

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GND

23

ground

VCODEC

24

decoupling for Voltage-Controlled Oscillator (VCO) supply voltage

PLL

25

PLL tuning voltage

PLLREF

26

PLL reference voltage

7.

TEST

27

AMSELIN1

28

D AMSELIN2

29

IE AMIFAGC1

30

AMSELOUT1 31

AMSELOUT2 32

IF Functional description

test pin; leave open in normal operation

AM selectivity input 1

AM selectivity input 2

AM IF AGC 1

AM selectivity output 1

AM selectivity output 2

SS 7.1 FM tuner

The RF input signal is mixed to a low IF with inherent image suppression. The IF signal is

A filtered and demodulated. The complete signal path is fully integrated.

L 7.2 AM tuner

C The RF signal is filtered and mixed to a low IF with inherent image suppression. The IF

signals are filtered and demodulated. The signal path is highly integrated.

UN 7.3 PLL tuning system

The PLL tuning system includes a fully integrated VCO. To avoid problems with unwanted

signals on image side, the receiver controls automatically high-side or low-side injection.

7.4 FM stereo decoder

The MPX signal from the FM tuner is translated by the stereo decoder into a left and right

audio channel. Good channel separation is achieved without alignment.

7.5 Weak signal processing and noise blanker

The reception quality of the station received is measured by a combination of detectors:

field strength (LEVEL), multipath (WAM) and noise (USN). The audio processing functions

soft mute, HCC and stereo blend are controlled accordingly to maintain the best possible

audio quality in case of poor signal conditions. Audio disturbances like e.g. ignition noise

are suppressed by the noise blanker circuit, using USN detection on MPX and spike

detection on the level signal.

TEF6621_1

Objective data sheet

Rev. 01.04 — 7 August 2008

© NXP B.V. 2008. All rights reserved.

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