MC44BC373/4C Просмотр технического описания (PDF) - Motorola => Freescale
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MC44BC373/4C Datasheet PDF : 52 Pages
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Audio Characteristics
13 Audio Characteristics
Each of the characteristics listed in Table 22 is classified as one of the following types:
• A—100% tested
• B—100% correlation tested
• C—Characterized on samples
• D—Design parameter
See Section 14, “Characterization Measurement Conditions,” for each C-type parameter.
Unless otherwise stated, VCC = 5.0V, ambient temperature = 25°C, and video input is 1 Vp-p, with 10-step
grey scale and RF output into 75-Ω load.
NOTE
Specifications are only valid for envelope demodulation.
Table 22. Audio Performance Characteristics 1
Parameter
Test Conditions
Minimum Typical Maximum Unit Type
Picture-to-sound ratio
PS bit set to 1
13
16
PS bit set to 0
9
12
Audio modulation depth Using specific pre-emphasis circuit,
audio input level = 205 mVrms, audio frequency = 1 kHz
AM modulation: SECAM Fs=6.5MHz
76
80
FM modulation: Fs=5.5, 6, or 6.5 MHz
76
80
100% modulation = ±50 kHz FM deviation
FM modulation: NTSC Fs=4.5MHz
76
80
100% modulation = ±25 kHz FM deviation
Audio input resistance
45
53
Audio frequency response Reference 0dB at 1kHz
using specified pre-emphasis circuit,
measured from 50 Hz to 15 kHz
(depends on loop filter components)
–2.0
—
Audio distortion FM
(THD only)
At 1 kHz, 100% modulation (±50 kHz)
No video
—
0.2
Audio distortion AM
(THD only)
At 1 kHz, 100% modulation
No video
—
1.5
Audio S/N with sync
buzz FM
Ref 1 kHz, 50% modulation (±25 kHz)
EBU color bars video signal,
using CCIR 468-2 weighting filter
50
54
Audio S/N with sync
buzz AM
Reference 1kHz, 85% modulation
Video input EBU color bar 75%
Audio BW 40Hz–15kHz,
using CCIR 468-2 weighting filter
1 See Section 14, “Characterization Measurement Conditions.”
45
50
19
dB B
15
84
%B
84
%B
84
%B
61
KΩ A
+2.0 dB C
0.8
%C
2.5
%D
—
dB C
—
dB D
16
MC44BS373CA Data Sheet
MOTOROLA
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