收音芯片TEF6621_1_tef6686电路图

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UNCLASSIFIED

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1. General description

The TEF6621 is an AM/FM radio including Phase-Locked Loop (PLL) tuning system. The

system is designed in such a way, that it can be used as a world-wide tuner covering

common FM and AM bands for radio reception. All functions are controlled by the I

C-bus.

Besides the basic feature set it provides a good weak signal processing function.

2. Features

n FM tuner for Japan, Europe and US reception

n AM tuner for Long Wave (LW) and Medium Wave (MW) reception

n Integrated AM Radio Frequency (RF) selectivity

n Integrated PLL tuning system; controlled via I

C-bus

n Fully integrated Local Oscillator (LO)

n No alignment needed

n Very easy application on the main board

n No critical RF components

n Fully integrated Intermediate Frequency (IF) ﬁlters and FM stereo decoder

n Fully integrated FM noise blanker

n Field strength (LEVEL), multipath [Wideband AM (WAM)] and noise [UltraSonic Noise

(USN)] dependent stereo blend

n Field strength (LEVEL), multipath (WAM) and noise (USN) dependent High-Cut

Control (HCC)

n Field strength (LEVEL), multipath (WAM) and noise (USN) dependent soft mute

n Single power supply

TEF6621

Tuner on main-board IC

Rev. 01.04 — 7 August 2008 Objective data sheet

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Objective data sheet Rev. 01.04 — 7 August 2008 5 of 58

UNCLASSIFIED

NXP Semiconductors

TEF6621

Tuner on main-board IC

7. Functional description

7.1 FM tuner

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

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

7.2 AM tuner

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.

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.

SDA 19 I

C-bus data input and output

VREF 20 reference voltage decoupling

VREGSUP 21 supply voltage internal voltage regulators

CC1

22 supply voltage 1

GND 23 ground

VCODEC 24 decoupling for Voltage-Controlled Oscillator (VCO) supply voltage

PLL 25 PLL tuning voltage

PLLREF 26 PLL reference voltage

TEST 27 test pin; leave open in normal operation

AMSELIN1 28 AM selectivity input 1

AMSELIN2 29 AM selectivity input 2

AMIFAGC1 30 AM IF AGC 1

AMSELOUT1 31 AM selectivity output 1

AMSELOUT2 32 AM selectivity output 2

Table 3. Pin description

…continued

Symbol Pin Description

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