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MC13028A 데이터시트(PDF) 3 Page - Motorola, Inc

부품명 MC13028A
상세설명  C-QUAM AM STEREO ADVANCED WIDE VOLTAGE IF and DECODER for E.T.R. RADIOS
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제조업체  MOTOROLA [Motorola, Inc]
홈페이지  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC13028A 데이터시트(HTML) 3 Page - Motorola, Inc

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MC13028A
3
MOTOROLA ANALOG IC DEVICE DATA
Standard Test Circuit
IF
Amp
Pilot Tone
Detector
Reg
Signal Quality
Detector
AM Stereo
Decoder
AGC
Left
Right
L
Audio
Output
R
10 k
2.2 k
Loop
3.6 MHz
VCC
2.2 k
9
10
11
12
13
14
15
16
4
3
2
1
+
10
µF
Blend
LED
Pilot Ind
Gnd
0.01
µF
IFin
0.47
µF
10
µF
R1
VCC
10
µF
10
µF
0.47
µF
0.22
µF
47
µF
2.2 k
10 k
47
µF
47
43 pF
+
8
7
6
5
+
+
+
+
+
RO
RO
+
+
PIN FUNCTION DESCRIPTION
Pin
Symbol
Internal Equivalent Circuit
Description/External Circuit Requirements
1
STA
VCC
1
2.4 k
Stereo Threshold Adjustment Pin
The function of this circuit is to provide the freedom
to achieve a desired value of incoming IF signal level
which will cause full stereo operation of the decoder.
The level can be determined by the value of R1, a
resistor from Pin 1 that can be connected to either
VCC or to ground. This resistor may also be omitted
in some designs (Pin 1 left open). The approximate
dc level with the pin left open is 0.6 Vdc.
2
AGCcap
2
AGC Filter Bypass Capacitor
An electrolytic capacitor is used as a bypass filter
and it sets the time constant for the AGC circuit
action. The recommended capacitor value is 10
µF
from Pin 2 to ground. The dc level at this pin varies
as shown in the curve in Figure 13, AGC Voltage
versus Input Level.
3
IFFBcap
VCC
3
2.0 k
IF Amplifier Feedback Capacitor
A capacitor which is specified to have a low ESR
at 450 kHz is normally used at Pin 3. The value
recommended for this capacitor is 0.47
µF from
Pin 3 to ground. This component forms a low pass
filter which has a corner frequency around 30 kHz.


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