MC13028A View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MC13028A Datasheet PDF : 20 Pages
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MC13028A
VCC
Pilot Ind
Blend
R1
+
10 µF
+
0.47 µF
IFin
0.01 µF
Gnd
LED +
10 µF
+
10 µF
Standard Test Circuit
1
IF
Amp
2
AGC
Right
16
Left
15
10 k
RO
RO
10 k
3
14
47 47 µF
AM Stereo
+
Decoder
3.6 MHz
4
13
43 pF
5
Signal Quality
Detector
12
R
Audio
L
Output
2.2 k
2.2 k
Loop
47 µF +
VCC
6
11
0.22 µF +
7 Reg
10
+
2.2 k
Pilot Tone
0.47 µF
Detector
8
9
+
10 µF
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ Pin
Symbol
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 1
STA
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 2
AGCcap
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ 3
IFFBcap
PIN FUNCTION DESCRIPTION
Internal Equivalent Circuit
Description/External Circuit Requirements
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
VCC
3
2.0 k
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.
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.
MOTOROLA ANALOG IC DEVICE DATA
3
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