MC44BS373CADR2 datasheet(21/52 Pages) FREESCALE

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MC44BS373CA Data Sheet

Characterization Measurement Conditions

Picture-to-Sound Ratio

No video signal

No audio signal

PS bit set to 0 and 1

Measure in dBc sound carrier in reference to picture carrier (TVout_Ref)

for PS bit = 0 (PS = 12 dB typical) and for PS bit = 1 (PS = 16 dB),

Audio Modulation Depth—FM Modulation

Video black level

Audio signal: 1 kHz, 205 mVrms.

This is measured using a Rohde & Schwarz

AMFS demodulator in B/G and an

HP8903A audio analyzer at 1 kHz.

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 into percentage of FM deviation, based on

specified standards.

Audio Frequency Response

Video black level

Audio signal: 50 Hz to 15 kHz, 100 mVrms

This is measured using a Rohde & Schwarz

AMFS demodulator in B/G and an

HP8903A audio analyzer.

The audio signal, 1 kHz 100 mVrms, is supplied by the audio analyzer,

and demodulated by the demodulator. 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 and all audio

analyzer filters are switched off.

Audio Distortion FM

Audio: 1 kHz, adjustable level

Video black level

This is measured using a Rohde & Schwarz

AMFS UHF demodulator in B/G and an

HP8903A 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.

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 of the

two signals as a percentage.

Audio Signal to Noise

Audio: 1 kHz, adjustable level

Video: EBU color bars

This is measured using a Rohde & Schwarz

AMFS demodulator in B/G and an

HP8903A 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 AMFS demodulator.

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 CCIR 468-2 filter of the

audio analyzer together with the internal 30±2-kHz (60 dB/decade)

low-pass 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 24. Measurement Conditions (continued)

Device and Signal Set-Up

Measurement Set-Up

Picture Carrier

Sound Carrier

+5.5 MHz

ADist

Distortion

Noise

() Distortion Noise Signal

()

⁄

ASN dB

()

Signal

Noise

()

log

Noise

()

⁄

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