MC3371 Datasheet, PDF (6/20 Pages) Motorola, Inc – LOW POWER FM IF

MC3371 MC3372
MC3371 PIN FUNCTION DESCRIPTION
OPERATING CONDITIONS VCC = 4.0 Vdc, RFIn = 100 µV, fmod = 1.0 kHz, fdev = 3.0 kHz. MC3371 at fRF = 10.7 MHz (see Figure 11).
Internal Equivalent
Pin
Symbol
Circuit
Description
Waveform
1
OSC1
The base of the Colpitts oscillator. Use
a high impedance and low capacitance
probe or a “sniffer” to view the wave–
form without altering the frequency.
Typical level is 450 mVpp.
VCC
2
OSC2
1
OSC1
2
OSC2
15 k
200
µA
The emitter of the Colpitts oscillator.
Typical signal level is 200 mVpp. Note
that the signal is somewhat distorted
compared to that on Pin 1.
3
MXOut
4
VCC
3
MixerOut
Output of the Mixer. Riding on the
455 kHz is the RF carrier component.
The typical level is approximately
60 mVpp.
4
VCC
1.5 k
100
µA
Supply Voltage –2.0 to 9.0 Vdc is the
operating range. VCC is decoupled to
ground.
5
IFIn
5
IFIn
Input to the IF amplifier after passing
through the 455 kHz ceramic filter. The
signal is attenuated by the filter. The
6 ^{1.8 k}
53 k
DEC1
typical level is approximately
50 mVpp.
7
6
DEC1
DEC2
7
DEC2
51 k
60 µA
IF Decoupling. External 0.1 µF
capacitors connected to VCC.
8
Quad
Coil
8
Quad Coil
VCC
Quadrature Tuning Coil. Composite
(not yet demodulated) 455 kHz IF
signal is present. The typical level is
500 mVpp.
10
50 µA
6
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