TEA5767 Просмотр технического описания (PDF) - NXP Semiconductors.
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TEA5767 Datasheet PDF : 40 Pages
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NXP Semiconductors
TEA5767HN
Low-power FM stereo radio for handheld applications
Table 3. Pin description …continued
Symbol
Pin
Description
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
VAFR
TMUTE
22
left audio frequency output voltage
23
right audio frequency output voltage
24
time constant for soft mute
MPXO
25
FM demodulator MPX signal output
Vref
TIFC
26
reference voltage
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
AGND
32
gain control current for IF filter
33
analog ground
VCCA
RFI1
34
analog supply voltage
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
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.
TEA5767HN_5
Product data sheet
Rev. 05 — 26 January 2007
© NXP B.V. 2007. All rights reserved.
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