MC44BC373C datasheet(16/30 Pages) FREESCALE

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MC44BC373C/374C Technical Data

Characterization Measurement Conditions

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

Device and Signals Set-up

Measurement Set-up

ADist

Distorsion

Noise

() Distorsion Noise Signal

()

⁄

ASN dB

()

Signal

Noise

() Noise

()

⁄

log

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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