參數(shù)資料
型號(hào)： MC44BS374T1EF
廠商： Freescale Semiconductor
文件頁(yè)數(shù)： 13/34頁(yè)
文件大小： 0K
描述： IC AUDIO/VIDEO MODULATOR 16-SOIC
標(biāo)準(zhǔn)包裝： 48
類型： NTSC/PAL 調(diào)制器
應(yīng)用： 音頻/視頻，VCR，機(jī)頂盒
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC N
包裝： 管件
MC44BS374T1/374T1A Advance Information
Characterization Measurement Conditions
Audio Modulation Depth
Video Black Level
Audio signal: 1Khz, 205mVrms.
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G and
a HP8903A Audio Analyzer at 1kHz
The audio signal 205mV at 1kHz is supplied by the Audio Analyzer,
and the FM demodulated signal deviation is indicated on the
Demodulator in Khz peak.
This value is then converted in% of FM deviation, based on specified
standards.
Audio Frequency response
Video Black Level
Audio signal: 50Hz to 15KHz, 100mVrms
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G and
a HP8903A.
The audio signal 1KHz 100mVrms is supplied by the Audio Analyzer,
demodulated by the Demodulator and the audio analyzer measures
the AC amplitude of this demodulated audio signal: this value is taken
as a reference (0dB).
The audio signal is then swept from 50Hz to 15KHz, and demodulated
AC amplitude is measured in dB relative to the 1KHz reference.
Audio pre-emphasis and de-emphasis circuits are engaged, all audio
analyzer filters are switched OFF.
Audio Distortion FM
Audio: 1Khz, adjustable level
Video Black Level
This is measured using a Rohde &
Schwarz AMFS UHF Demodulator in B/G
and a HP8903A Audio Analyzer at 1kHz.
The output level of the Audio analyzer is
varied to obtain a deviation of 50kHz
indicated on the Demodulator.
The input arms detector of the Audio Analyzer converts the ac level of
the combined signal + noise + distortion to dc. It then removes the
fundamental signal (1kHz) after having measured the frequency. The
output rms detector converts the residual noise + distortion to dc. The
dc voltmeter measures both dc signals and calculates the ratio in% of
the two signals.
Audio Signal to Noise
Audio: 1Khz, adjustable level
Video: EBU Color Bars
This is measured using a Rohde &
Schwarz AMFS Demodulator in B/G and
a HP8903A Audio Analyzer at 1kHz. The
output level of the Audio analyzer is
varied to obtain a Modulation Deviation of
25kHz indicated on the AMFS
Demodulator.
The Audio Analyzer alternately turns ON and OFF it's internal audio
source to make a measure of the Audio signal plus noise and then
another measure of only the noise.
The measurement is made using the internal CCIR468-2 Filter of the
Audio Analyzer together with the internal 30+/-2kHz (60dB/decade)
Lowpass filters.
The AMFS demodulator uses a quasi-parallel demodulation as is the
case in a normal TV set. In this mode the Nyquist filter is bypassed and
the video carrier is used without added delay to effectuate intercarrier
conversion. In this mode the phase noise information fully cancels out
and the true S/N can be measured.
Table 7. Measurement Conditions
Device and Signals Set-up
Measurement Set-up
ADist
Distorsion
Noise
+
() Distorsion Noise Signal
++
()
=
ASN dB
()
20
Signal
Noise
+
() Noise
()
log
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=
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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