參數(shù)資料
型號: MC13028A
廠商: Motorola, Inc.
英文描述: C-QUAM AM STEREO ADVANCED WIDE VOLTAGE IF and DECODER for E.T.R. RADIOS
中文描述: ? -華富AM立體聲先進(jìn)的IF和東突收音機解碼器電壓
文件頁數(shù): 17/20頁
文件大小: 513K
代理商: MC13028A
MC13028A
17
MOTOROLA ANALOG IC DEVICE DATA
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
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
MC13028A/LA1832 Application
Circuit Board Test
Am Stereo
Generator
1070 kHz
50
Output
50
AM Ant. Input
Ant. Tuning Block
1
U1
MC13028A
AM Stereo Audio Output
Left
Right
For Stereo Measurements, Pilot On
Distortion
Analyzer
and
Audio Voltmeter
Pilot Filter
and
Buffer Amp
FET Probe
Audio Voltmeter
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