MC44CC373CAEFR2 Freescale Semiconductor, MC44CC373CAEFR2 Datasheet - Page 22

• Manufacturer Part Number: MC44CC373CAEFR2
• Description: Modulator / Demodulator CMOS MOD R3.0 373CA
• Manufacturer: Freescale Semiconductor

Specifications of MC44CC373CAEFR2

• Package / Case: SOIC-16
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 22. Performance Measurement Test Set-ups (continued)
MC44CC373
22
Video: Black Sync
Audio signal: 1 kHz, 205 mV
This is measured using a Demodulator in B/G
and an Audio Analyzer at 1 kHz
Video: Black Sync
Audio signal: 50 Hz to 15 kHz, 100 mV
This is measured using a Demodulator in B/G
and an Audio Analyzer.
Audio: 1 kHz, adjustable level
Video: Black Sync
This is measured using a UHF Demodulator in
B/G and an Audio Analyzer at 1 kHz. The
output level of the audio analyzer is varied to
obtain a deviation of 50 kHz indicated on the
Demodulator.
Audio: 1 kHz, adjustable level
Video: EBU Color Bars
This is measured using a Demodulator in B/G
and an Audio Analyzer at 1 kHz. The output
level of the Audio analyzer is varied to obtain
a Modulation Deviation of 25 kHz indicated on
the Demodulator.
Device and Signals Set-up
rms
.
rms
Audio Modulation Index - FM Modulation
Audio Frequency Response
The audio signal 205 mV at 1 kHz 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.
The audio signal 1 kHz 100 mV
demodulated by the Demodulator and the audio analyzer measures the AC
amplitude of this demodulated audio signal: this value is taken as a reference
(0 dB).
The audio signal is then swept from 50 Hz to 15 kHz, and demodulated AC
amplitude is measured in dB relative to the 1 kHz reference.
Audio pre-emphasis and de-emphasis circuits are engaged, all audio analyzer
filters are switched OFF.
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 (1 kHz) 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.
The Audio Analyzer alternately turns ON and OFF its 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 +/−2 kHz (60 dB/decade) Lowpass
filters.
The 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.
Audio Signal to Noise
Audio Distortion FM
ADist
ASN dB
=
(
(
Distortion
)
=
20
Measurement Set-up
×
+
log
rms
Noise
(
Signal
is supplied by the Audio Analyzer,
)
⁄
(
Distortion
+
Noise
)
⁄
+
(
Freescale Semiconductor
Noise
Noise
)
+
Signal
Digital Home
)