mc44bs374t1a Freescale Semiconductor, Inc, mc44bs374t1a Datasheet - Page 14

• Manufacturer Part Number: mc44bs374t1a
• Description: Pll Tuned Uhf And Vhf Audio/video High Integration Modulator
• Manufacturer: Freescale Semiconductor, Inc

Audio Characteristics
14 Audio Characteristics
Unless otherwise stated: V
RF inputs / outputs into 75 Ohm load.
Picture-to-Sound ratio
Audio modulation depth
Audio input resistance
Audio Frequency
response
Audio Distortion FM (THD
only)
Audio S / N with Sync Buzz
FM
Note: 2: See “Characterization Measurement Conditions” on page 15.
Parameter
Note:
Specifications only valid for envelope demodulation.
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Freescale Semiconductor, Inc.
=5.0 V, Ambient Temperture=25
Table 6. Audio Performance Characteristics
MC44BS374T1/374T1A Advance Information
PS bit set to 0
PS bit set to 1
Using specific pre-emphasis circuit,
audio input level = 205 mVrms - audio frequency = 1 kHz
FM modulation : Fs = 5.5, 6 or 6.5 MHz
100% modulation = +/-50 kHz FM
deviation
FM modulation : NTSC Fs = 4.5 MHz
100% modulation = +/-25 kHz FM
deviation
Reference 0 dB at 1 kHz,
using specified pre-emphasis circuit,
measure from 50 Hz to 15 kHz
Depends on loop filter components
at 1 kHz, 100% modulation ( 50 kHz )
No video
Ref 1Khz, 50% modulation (+/-25Khz)
EBU color bars Video signal,
using CCIR 468.2 weighting filter
For More Information On This Product,
Figure 5. Typical Video Performance
90
88
86
84
82
80
78
76
74
471
Typical
PAL Video Modulation Depth
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521
Test Conditions
571
Frequency (Mhz)
621
Maximum specification
Minimum specification
671
721
o
C, Video Input 1V
771
821
Min
-2.0
13
76
76
45
50
9
-
871
Typ
0.2
12
16
80
80
53
54
-
p-p
Max
+2.0
, 10-step grayscale.
0.8
15
19
84
84
61
-
Unit
K
dB
dB
dB
%
%
%
Type
B
B
B
A
C
C
C