C–QUAM AM STEREO
ADVANCED WIDE VOLTAGE
IF and DECODER
for E.T.R. RADIOS
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.
SEMICONDUCTOR
TECHNICAL DATA
• Adjustable Audio Output Level
• Stereo Blend Function
16
1
• Stereo Threshold Adjustment
• Operation from 2.2 V to 12 V Supply
• Precision Pilot Tone Detector
• Forced Mono Function
P SUFFIX
PLASTIC PACKAGE
CASE 648
• Single Pinout VCO
• IF Amplifier with IF AGC Circuit
• VCO Shutdown Mode at Weak Signal Condition
16
1
D SUFFIX
PLASTIC PACKAGE
CASE 751B
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.
(SO–16)
PIN CONNECTIONS
Representative Block Diagram
Stereo
Threshold Adjust
Right Channel
Output
1
2
3
4
5
6
7
8
16
15
14
AGC Bypass
Filter
16
15
14
13
12
11
10
9
Left Channel
Output
IF Feedback
Bypass
Loop Filter
8
VCO
IF Signal Input
Gnd
13 VCO Output
V
CC
12
11
10
9
AM Stereo
Decoder
Pilot Tone
Detector
Stereo
Indicator Drive
Pilot Signal
Input
Pilot Q Detector
Output
1.0 V
Reference
IF
Amp
Pilot I Detector
Output
Blend
Signal Quality
Detector
AGC
ORDERING INFORMATION
Operating
Reg
Temperature Range
Device
Package
SO–16
MC13028AD
MC13028AP
T
A
= –25° to +70°C
1
2
3
4
5
6
7
8
DIP–16
This device contains 679 active transistors.
9–119
MOTOROLA ANALOG IC DEVICE DATA