Device

Operating

Temperature Range

Package

ORDERING INFORMATION

MC13028AD

TA = – 25° to +70°C

SO–16

MC13028A

SEMICONDUCTOR

TECHNICAL DATA

C–QUAM AM STEREO

ADVANCED WIDE VOLTAGE

IF and DECODER

for E.T.R. RADIOS

Order this document by MC13028A/D

D SUFFIX

PLASTIC PACKAGE

CASE 751B

(SO–16)

1

16

P SUFFIX

PLASTIC PACKAGE

CASE 648

16

15

14

13

12

11

10

1

2

3

4

5

6

7

8

9

Stereo

Threshold Adjust

AGC Bypass

Filter

IF Feedback

Bypass

IF Signal Input

Gnd

Stereo

Indicator Drive

1.0 V

Reference

Blend

Right Channel

Output

Left Channel

Output

Loop Filter

VCO Output

VCC

Pilot Signal

Input

Pilot Q Detector

Output

Pilot I Detector

Output

1

16

PIN CONNECTIONS

MC13028AP

DIP–16

1

MOTOROLA ANALOG IC DEVICE DATA

Advanced Wide Voltage

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.

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.

Representative Block Diagram

This device contains 679 active transistors.

8

7

6

5

4

3

2

1

9

10

11

12

13

14

15

16

Reg

AGC

Signal Quality

Detector

Pilot Tone

Detector

B 8

VCO

AM Stereo

Decoder

IF

Amp

© Motorola, Inc. 1996

Rev 2