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MC13122 bảng dữ liệu(PDF) 11 Page - Motorola, Inc

tên linh kiện MC13122
Giải thích chi tiết về linh kiện  AMAX STEREO CHIPSET
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nhà sản xuất  MOTOROLA [Motorola, Inc]
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MC13122 bảng dữ liệu(HTML) 11 Page - Motorola, Inc

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MC13027 MC13122
11
MOTOROLA ANALOG IC DEVICE DATA
MC13027 PIN FUNCTION DESCRIPTION (continued)
Description
Pin
Internal Equivalent Circuit
Name
8
VCC
8
VCC
VCC
Supply Voltage
The normal operating voltage range is 6.0 to 10 V.
9
VCLO
9
VCC
VCLO
4.0 V
1.5 k
Voltage Control Local Oscillator
The oscillator is a cross coupled negative
resistance type and this pin must be connected
through a low dc resistance to Pin 4, the 4.0 V
regulator. Normally, this would be the secondary of
the oscillator coil.
The impedance of the secondary winding should
be around 2.8 k
Ω to guarantee that the oscillator
will run. It operates at 4 times the LO frequency:
fosc = 4(Fin+FIF).
10
LO Out
10
VCC
390
LO Out
Local Oscillator Output
This is an emitter follower for LO output to drive a
synthesizer. It is a square wave output, the internal
series resistance and allows a small bypass to
reduce high frequency harmonics.
12
RF Blank
12
100 k
RF Blk
RF Blanker
An unbiased NPN acts as a SHUNT impedance
when turned on. The 100 k resistor provides a dc
path for the capacitor.
13
Gnd2
13
Gnd
IF Ground
Pin 13 is the ground for the IF section and the
timing and switching circuits in the blanker.
In the application circuit this should be common to
the MC13122 ground.
14
IF In
16
VCC
4.0 V
220
IF Out
2.2 k
IF Input
A degenerated differential amplifier internally
biased to 4.0 V. The IF input impedance is
approximately 1.8 k to match a ceramic filter. The
IF amplifier is used as a buffer between the
ceramic filter and the detector coil and has a fixed
gain determined by the impedance of the output
coil.
16
IF Out
14
3.4 k
3.4 k
IF In
IF Output
An open collector provides high–impedance drive
to the MC13122; the IF gain is set by the ac
impedance on this pin.
15
RF Time
15
4.0 V
10 k
RF Blk Time
RF Blank Time
A resistor to ground sets the RF blanking time. The
time is set to the minimum required to attenuate
the pulse received. This is normally longest at the
low end of the band. The value is best approved by
ear. A fixed value can be chosen for production.
(50
µs is typical.)


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