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TEA5761UK Fiches technique(PDF) 7 Page - NXP Semiconductors

No de pièce TEA5761UK
Description  Low voltage single-chip FM stereo radio
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Fabricant  NXP [NXP Semiconductors]
Site Internet  http://www.nxp.com
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TEA5761UK Fiches technique(HTML) 7 Page - NXP Semiconductors

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© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 01 — 2 August 2006
6 of 44
Philips Semiconductors
TEA5761UK
Low voltage single-chip FM stereo radio
8.
Functional description
8.1 Low noise RF amplifier
The LNA input impedance together with the LC RF input circuit defines an FM band filter.
The gain of the LNA is controlled by the RF AGC circuit.
8.2 I/Q mixer 1st FM
The FM quadrature mixer converts FM RF (76 MHz to 108 MHz) to IF.
8.3 VCO
The LC tuned VCO provides the Local Oscillator (LO) signal for the FM quadrature mixer.
The VCO frequency range is from 150 MHz to 217 MHz. No external varactor is required.
8.4 Crystal oscillator
The crystal oscillator can operate with a 32.768 kHz clock crystal or via an external
32.768 kHz reference clock source connected to pin FREQIN. Selection between a
reference clock or a reference crystal can be done by software programming via the
I2C-bus. When a clock crystal is used, pin FREQIN must be left open-circuit, or when
external clocking is used, there should be no crystal connected to pin XTAL.
The temperature drift of 32.768 kHz clock crystals limits the operational temperature
range. The preferred crystal specifications are given in Table 31.
The crystal oscillator generates the reference frequency for:
Synthesizer PLL tuning system
Timing for the IF counter
Free running frequency adjustment of the stereo decoder VCO
Center frequency adjustment of the IF filters
XTAL
F1
crystal oscillator input
GNDA
F2
analog ground
VAFL
F4
left audio output
i.c.
F6
internally connected; leave open
GNDD
F7
digital ground
FREQIN
G1
32.768 kHz reference frequency input
GNDA
G2
analog ground
n.c.
G3
not connected
MPXOUT
G4
FM demodulator MPX output
VAFR
G5
right audio output
TMUTE
G6
soft mute time constant capacitor
INTX
G7
interrupt flag output
Table 3:
Pin description …continued
Symbol
Pin
Description


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