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MC44BC374T1 Datasheet(PDF) 10 Page - Freescale Semiconductor, Inc

Part No. MC44BC374T1
Description  PLL Tuned PAL/NTSC UHF and VHF Audio/Video High Integration Modulator IC
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MC44BC374T1 Datasheet(HTML) 10 Page - Freescale Semiconductor, Inc

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MC44BC374T1 Technical Data
Audio Characteristics
11 Audio Characteristics
Unless otherwise stated: Vcc=5.0V, Ambient Temperture=25
o C, Video Input 1V
p-p, 10-step grayscale.
RF output into 75 Ohm load. SPECIFICATIONS ONLY VALID FOR ENVELOPE DEMODULATION.
Figure 5. Typical performances
Parameter
Test Conditions
Min
Typ
Max
Unit
Type
Picture-to-Sound ratio
PS bit set to 0
PS bit set to 1
13
9
16
12
19
15
dB
B
Audio modulation depth
Using specific pre-emphasis circuit,
audio input level=205mVrms–audio frequency=1kHz
FM modulation: Fs=5.5, 6 or 6.5MHz
100% modulation=±50kHz FM deviation
—80
%
B
FM modulation: NTSC Fs=4.5MHz
100% modulation=±25kHz FM deviation
—80
%
B
Audio input resistance
45
53
61
K
A
Audio Frequency response
Reference 0dB at 1kHz,
using specified pre-emphasis circuit,
measure from 50Hz to 15kHz
–2.5
+2dB
C
Audio Distortion FM (THD only)
at 1kHz, 100% modulation (
±50kHz)
No video
—0.4
2
%
C
Audio S/N with Sync Buzz FM
See Figure 4
48
53
dB
C
Audio Signal to Noise
46
48
50
52
54
56
58
471 521 571 621 671 721 771 821 871
Frequency (Mhz)
Typical
Minimum specification
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com


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