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Specifications:
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Supply
Voltage: 2 - 10V
Transmission Frequency: 70 - 120MHz
Power Consumption: 8mA
AF Audio Output: 75mV |
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About
TDA7000 FM Receiver / TV Tuner
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This simple one chip FM
receiver / TV tuner will allow you to receive frequencies
from 70 up to 120MHz. With this small receiver it
is possible to pickup TV stations, entire 88 - 108MHz
FM band, aircraft conversation and many other private
transmissions. It is a perfect companion to any FM
Transmitter especially if FM band in your area is
very crowded. TDA7000 receiver offers very good sensitivity
therefore it will even allow you to pickup weaker
signals that cannot be heard on conventional FM receivers.
A neat feature of presented TDA7000 FM receiver is
a voltage controlled oscillator similar to TV tuners
that are used in television sets. Frequency is tuned
by varying the input voltage to the oscillator. The
advantage of this type of oscillator is that you can
use regular 100K potentiometer to precisely tune to
a given broadcast. Tuning can be performed much quicker
and precisely than by using a trimmer (variable capacitor).
Trimmers will also shift the frequency as you touch
them where potentiometer will not. Trimmer also needs
to be placed on receiver's PCB to minimize the stray
capacitance where potentiometer can be conveniently
placed anywhere you want because it will not be affected
by any external capacitance.
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TDA7000
Block Diagram
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TDA7000
is a great chip because it includes RF input stage,
mixer, local oscillator, IF (intermediate frequency)
Limiter, IF filter, amplifier, Phase demodulator,
Mute detector, Frequency-Locked-Loop system and voltage
controlled oscillator (VCO) all in a single chip,
so you don't have to do so much tuning and tweaking
as you would normally do in super heterodyne receivers.
TDA7000 is also a great choice for folks that don't
have great experience with RF circuits due to the
fact that there are few external capacitors &
resistors needed, no external IF filters, and only
one variable coil and varicap diode.
The IC has an FLL (Frequency-Locked-Loop) system with
an intermediate frequency of 70 kHz. The IF selectivity
is obtained by active RC filters. The only function
which needs alignment is the resonant circuit for
the oscillator, thus selecting the reception frequency.
Spurious reception is avoided by means of using a
muting circuit similar to squelch. This eliminates
and rejects other input signals around selected frequency
so that even remote stations can sound clear just
as if they were located near by.
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Audio
Output
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TDA7000's audio output
signal is only around 70mV which might be enough
for driving crystal earphones or high impedance
headphones. For higher power audio signal you
can easily connect audio amplifier built around
LM386 or just about any amplifier chip that will
suit your taste.
Reception of stereo audio signal is possible
by connecting an external stereo decoder circuit
(LM1310) to audio output.
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Frequency
Selection
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Frequency
selection is very straight forward. Use L1 variable
coil to tune to the lower or upper frequencies
that you want to receive and then use just 100K
potentiometer to fine tune to any specific frequency.
Potentiometer doesn't have to be mounted on
the PCB. You can conveniently mount it on enclosure
and use leads to connect it to the PCB. If you
intend to use TDA7000 as regular 88 - 108MHz
FM receiver the recommended voltage supply is
4.5 - 5V.
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Where to get the Parts
Related Links
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