MC44BC375U Datasheet, PDF (12/16 Pages) Freescale Semiconductor, Inc – PLL Tuned VHF (Channel 3 / 4)Audio / Video Modulator

Table 9. Performance Measurement Test Set-Ups (continued)
Device and Signals Set-Up
Measurement Set-Up
Audio Signal to Noise
Audio: 1.0 KHz, adjustable level
The Audio Analyzer alternately turns ON and OFF its internal audio source to
Video: EBU Color Bars
make a measure of the Audio signal plus noise and then another measure of only
This is measured using a Demodulator in B/G ^{the noise.}
and an Audio Analyzer at 1.0 KHz. The output The measurement is made using the internal CCIR468-2 Filter of the Audio
level of the Audio analyzer is varied to obtain Analyzer together with the internal 30+/-2.0 KHz (60 dB/decade) Lowpass filters.
a Modulation Deviation of 25 KHz indicated _{The AMFS demodulator uses a quasi-parallel demodulation as is the case in a}
on the AMFS Demodulator.
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.
ASN(dB) = 20 × log(Signal + Noise) ⁄ (Noise)
PIN CIRCUIT SCHEMATICS
Pin 1: CHS
Pin 2: PSS
Pin 16: SFS
Pin 9: Psave/LO
VCC
100K
VCC
VCC
5K
Pin 8: SPLLFLT
VCC
Pin 3: LOP
Pin 4: XTAL
VCC
5K
1.5K
VCC
Pin 6: PREM
10k
11.8k
audio
VCC
50k
Pin 7: AUDIO_IN
VCC
Pin 10: VIDEO_IN
500
10K
10K
VCC
Pin 13: RF _OUT
VCC
75
Pin 14: RFOV_CC
VCC
VCC
Pin 15: PLLFLT
100
2K
MC44BC375U
12
Figure 3. Pin Schematics
Application Specific Products
Freescale Semiconductor