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参数资料
| 型号： | MC44BC373 |
| 厂商： | Motorola, Inc. |
| 英文描述： | Multi-Standard or PAL/ NTSC Modulator with integrated antenna booster/splitter ICs |
| 中文描述： | 多制式或PAL / NTSC制式，集成天线的助推器调制器/分路器集成电路 |
| 文件页数： | 11/24页 |
| 文件大小： | 635K |
| 代理商： | MC44BC373 |
Audio Characteristics
MOTOROLA
MC44BC373/374
Technical Data
For More Information On This Product,
Go to: www.freescale.com
11
10 Audio Characteristics
Unless otherwise stated: V
cc
=5
.
0V, Ambient Temperature=25
o
C, Video Input 1V
p-p
, 10-step
grayscale. RF inputs/outputs into 75Ohm load. SPECIFICATIONS VALID ONLY FOR ENVELOPE
DEMODULATION.
Figure 5. Typical performance—Audio
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
AM modulation: SECAM Fs=6
.
5MHz
FM modulation: Fs=5
.
5, 6or6
.
5MHz
100% modulation=±50kHz FM deviation
FM modulation: NTSC Fs=4
.
5MHz
100% modulation=±25kHz FM deviation
65
80
95
%
B
65
80
95
%
B
65
80
95
%
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.
At 1kHz, 100% modulation (
±
50kHz).
No video.
–
2
.
5
—
+
2
dB
C
Audio Distortion FM (THD only)
—
0
.
4
2
%
C
Audio Distortion AM (THD only)
At 1kHz, 100% modulation.
No video.
—
1
.
5
2
.
5
%
D
Audio S/N with Sync Buzz FM
Video input EBU color bar 75%.
Weighting filter CCIR468-2.
48
53
—
dB
C
Audio S/N with Sync Buzz AM
Reference 1kHz, 85% modulation.
Video input EBU color bar 75%.
Audio BW from 40Hz to 15kHz.
Weighting filter CCIR468-2.
45
50
—
dB
D
Audio Signal to Noise
46
48
50
52
54
56
58
471 521 571
621 671 721 771 821 871
Frequency (Mhz)
d
Typical
Minimum specification
F
Freescale Semiconductor, Inc.
n
.
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