MC13028AP View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC13028AP

Advanced Wide Voltage IF and C-QUAM AM Stereo Decoder

Motorola => Freescale 

MC13028A

Figure 21. Decoder Signal Output for Mistuned

and Tuned Condition with Input Signal of 80%

L–R at 3.0 kHz

Mistuned

Tuned

AM Circuit Test

The connections for test are as shown in Figure 22. A 50 Ω

resistor is placed on the AM antenna input. The AM Stereo

generator is connected to the AM antenna input.

Measurements of audio level in mono mode are made with

an audio voltmeter connected through a FET probe (pilot

signal “off”). Measurements of audio level and distortion in

stereo mode (pilot signal “on”) are made using a pilot

rejection filter ahead of the distortion analyzer or the audio

meter. The pilot rejection filter has a rejection ratio that should

exceed 20 to 25 dB. Typical data is shown in Figures 23–26.

Figures 23 and 24 were read on the left channel in mono

mode. Figures 25–26 were in stereo mode.

Figure 22. MC13028A/LA1832 Application Circuit Board Test Setup

Am Stereo

Generator

50 Ω

1070 kHz

50 Ω Output

MC13028A/LA1832 Application

Circuit Board Test

AM Ant. Input

Ant. Tuning Block

Left

1

+

Right

U1

+

MC13028A

AM Stereo Audio Output

Audio Voltmeter

FET Probe

Pilot Filter

and

Buffer Amp

Distortion

Analyzer

and

Audio Voltmeter

For Stereo Measurements, Pilot On

MOTOROLA ANALOG IC DEVICE DATA

17

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