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MC13122 bảng dữ liệu(PDF) 10 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]
Trang chủ  http://www.freescale.com
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MC13027 MC13122
10
MOTOROLA ANALOG IC DEVICE DATA
MC13027 PIN FUNCTION DESCRIPTION
Pin
Name
Internal Equivalent Circuit
Description
1
WB AGC In
VCC
1
3.3 V
WB AGC In
R2
15 k
20 k
Wideband AGC Input
The input impedance to the WB AGC detector is
15 k and is internally biased so it must be coupled
through a capacitor. The threshold can be
increased by adding a resistor in series with the
input. The WB AGC begins at about 1.0 mV. In car
radios, this input should be connected to the
collector of the RF amplifier cascode stage through
a resistor and capacitor. A 68 pF to ground will
prevent undesired high frequency signals from
activating the WB AGC and make the sensitivity
more uniform across the band.
2
Blanker AGC
2
NB AGC
D1
D2
Blanker AGC
The capacitor to ground is the bypass for the noise
blanker AGC circuit. The noise blanker can be
disabled by grounding this pin. 10
µF is used in the
application, but it can be changed to match the
time constant of the main IF AGC in the MC13122,
Pin 4.
3
Feedback
3
NB Feedback
11 k
Blanker Feedback
This pin is the dc feedback to the input stage of the
wide band amplifier.
4
4.0 V Reg
4
7
4.0 V Reg
4.0 V Filter
Buffer
4.0 V Regulator
The 4.0 V regulator supplies low impedance bias to
many of the circuits in the IC. It should be
bypassed to a ground near Pin 5.
7
4.0 V Filt
VCC
4.7 k
Reg
4.0 V Filter
The external capacitor works with internal 4.7 k to
filter noise from the bandgap regulator.
5
Gnd
5
RF Gnd
RF Ground
This pin is the ground for the RF section, blanker
RF, filters and all radio circuits except the IF. In the
PCB layout, the ground pin should be used as the
internal return ground in the RF circuits.
6
BlkRF/MixIn
6
11
Mixer Out
Mixer/
Blanker In
LO +
VCC
LO
50
50
50
50
VCC
4.0 V
Mixer Input/Blanker RF Input
The blanker RF input must be biased from the
4.0 V on Pin 4. The mixer input is to two bases of
the upper mixer transistors. A low impedance dc
path to the 4.0 V on Pin 4 is required. Normally,
this would be a coil secondary connected between
Pins 6 and 4.
11
Mixer Out
750
LO–
Mixer Output
A single ended output of a double balanced mixer.
A load resistor to supply is chosen to match the
ceramic filter, typically 1.5 k to 1.8 k. Output
current is 830
µA.


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