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TEA5767HN Datasheet(PDF) 6 Page - NXP Semiconductors

Part No. TEA5767HN
Description  Low-power FM stereo radio for handheld applications
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Maker  PHILIPS [NXP Semiconductors]
Homepage  http://www.nxp.com
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 6 page
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TEA5767HN_4
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 04 — 20 February 2006
6 of 39
Philips Semiconductors
TEA5767HN
Low-power FM stereo radio for handheld applications
7.
Functional description
7.1 Low-noise RF amplifier
The Low Noise Amplifier (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.
7.2 FM mixer
The FM quadrature mixer converts the FM RF (76 MHz to 108 MHz) to an IF of 225 kHz.
7.3 VCO
The varactor tuned LC VCO provides the Local Oscillator (LO) signal for the FM
quadrature mixer. The VCO frequency range is 150 MHz to 217 MHz.
XTAL2
17
crystal oscillator input 2
PHASEFIL
18
phase detector loop filter
PILFIL
19
pilot detector low-pass filter
n.c.
20
not connected
n.c.
21
not connected
VAFL
22
left audio frequency output voltage
VAFR
23
right audio frequency output voltage
TMUTE
24
time constant for soft mute
MPXO
25
FM demodulator MPX signal output
Vref
26
reference voltage
TIFC
27
time constant for IF center adjust
LIMDEC1
28
decoupling IF limiter 1
LIMDEC2
29
decoupling IF limiter 2
n.c.
30
not connected
n.c.
31
not connected
Igain
32
gain control current for IF filter
AGND
33
analog ground
VCCA
34
analog supply voltage
RFI1
35
RF input 1
RFGND
36
RF ground
RFI2
37
RF input 2
TAGC
38
time constant RF AGC
LOOPSW
39
switch output of synthesizer PLL loop filter
n.c.
40
not connected
Table 3.
Pin description …continued
Symbol
Pin
Description




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