MC13027P View Datasheet(PDF) - Motorola => Freescale
Part Name
Description
Manufacturer
MC13027P Datasheet PDF : 28 Pages
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MC13027 MC13122
Figure 10. Blend Voltage versus RF Input Level
4.0
Figure 11. Separation versus RF Input Level
40
32
3.0
24
2.0
16
1.0
8.0
0
20
NOTE:
30
40
50
60
70
80
ANTENNA INPUT (dBµV)
The graphs on this page were made using the 15/60 pF
dummy antenna and the Application Circuit of Figure 6.
Figure 12. Signal to Noise versus RF Input Level
50
42
34
26
18
10
20
NOTE:
30
40
50
60
70
80
ANTENNA INPUT (dBµV)
The slightly abrupt change at around 25 dBµV is due
to the decoder switching into stereo.
Figure 14. Audio Output Level
versus RF Input Level
500
0
20
NOTE:
30
40
50
60
70
80
ANTENNA INPUT (dBµV)
The radio stays in mono until the stereo signal is
sufficiently large and then makes a smooth transition to
stereo. This is similar to FM receivers with variable
blend.
Figure 13. 5.0 kHz Attentuation
versus RF Input Level
0
–5.0
–10
–15
–20
–25
20
NOTE:
30
40
50
60
70
80
ANTENNA INPUT (dBµV)
This curve shows the effect of the variable audio
bandwidth control of the MC13122. It is due to the
variable loading of the IF coil and the variable 10 kHz
notch filter in the output.
Figure 15. Stop–Sense Voltage
versus RF Input Level
4.0
400
3.0 Pin 23 = Open
300
2.0
200
Pin 23 = Grounded
1.0
100
0
20
NOTE:
30
40
50
60
70
80
ANTENNA INPUT (dBµV)
All the curves of performance versus RF input level
were generated using the car radio receiver circuit
shown in Figure 6. Using a 15/60 pF dummy antenna
input and a 50% L only stereo signal.
MOTOROLA ANALOG IC DEVICE DATA
0
60
NOTE:
70
80
90
100
110
RF INPUT LEVEL (dBµV)
This measurement was made on the MC13122 alone
with a 10 k series input resistor. It will enable the
designer to determine the stop–sense level if the gain
of receiver RF section is known. Note that if Pin 23 is
held low, the SS voltage on Pin 6 rises from about 0.3
to 2.2 V over a small change in RF level. This can be
used to generate a very reliable stop signal. If Pin 23 is
not held low, the SS voltage starts out at 2.2 V and
rises slowly to a maximum of around 4.0 V.
21
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