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MC13028A Datasheet PDF : 20 Pages
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MC13028A
Advanced Wide Voltage
IF and C-QUAM® AM
Stereo Decoder
The MC13028A is a third generation C–QUAM stereo decoder targeted
for use in low voltage, low cost AM/FM E.T.R. radio applications. Advanced
features include a signal quality detector that analyzes signal strength,
signal to noise ratio, and stereo pilot tone before switching to the stereo
mode. A “blend function” much like FM stereo has been added to improve
the transition from mono to stereo. The audio output level is adjustable to
allow easy interface with a variety of AM/FM tuner chips. The external
components have been minimized to keep the total system cost low.
• Adjustable Audio Output Level
• Stereo Blend Function
• Stereo Threshold Adjustment
• Operation from 2.2 V to 12 V Supply
• Precision Pilot Tone Detector
• Forced Mono Function
• Single Pinout VCO
• IF Amplifier with IF AGC Circuit
• VCO Shutdown Mode at Weak Signal Condition
The purchase of the Motorola C–QUAM® AM Stereo Decoder does not carry with such pur-
chase any license by implication, estoppel or otherwise, under any patent rights of Motorola
or others covering any combination of this decoder with other elements including use in a
radio receiver. Upon application by an interested party, licenses are available from Motorola
on its patents applicable to AM Stereo radio receivers.
C–QUAM AM STEREO
ADVANCED WIDE VOLTAGE
IF and DECODER
for E.T.R. RADIOS
SEMICONDUCTOR
TECHNICAL DATA
16
1
P SUFFIX
PLASTIC PACKAGE
CASE 648
16
1
D SUFFIX
PLASTIC PACKAGE
CASE 751B
(SO–16)
Representative Block Diagram
16
15
14
13
12
11
10
9
VCO
AM Stereo
Decoder
IF
Amp
AGC
B8
Pilot Tone
Detector
Signal Quality
Detector
Reg
1
2
3
4
5
6
7
8
This device contains 679 active transistors.
MOTOROLA ANALOG IC DEVICE DATA
PIN CONNECTIONS
Stereo
Threshold Adjust
1
AGC Bypass
Filter
2
IF Feedback
Bypass
3
IF Signal Input 4
Gnd 5
Stereo
Indicator Drive
6
1.0 V 7
Reference
Blend 8
16
Right Channel
Output
15
Left Channel
Output
14 Loop Filter
13 VCO Output
12 VCC
11
Pilot Signal
Input
10
Pilot Q Detector
Output
9 Pilot I Detector
Output
ORDERING INFORMATION
Device
Operating
Temperature Range Package
MC13028AD
MC13028AP
TA = – 25° to +70°C
SO–16
DIP–16
© Motorola, Inc. 1996
Rev 2
1
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