参数资料
型号: MC44BS373CAFCR2
厂商: Freescale Semiconductor
文件页数: 8/52页
文件大小: 0K
描述: IC MODULATOR AUD/VID U/V 20-QFN
标准包装: 2,500
类型: NTSC/PAL 调制器
应用: 音频/视频,VCR,机顶盒
安装类型: 表面贴装
封装/外壳: 20-VQFN 裸露焊盘
供应商设备封装: 20-QFN 裸露焊盘(5x5)
包装: 带卷 (TR)
MC44BS373CA Data Sheet
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
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-
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
19
dB
B
PS bit set to 0
9
12
15
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
84
%
B
FM modulation: Fs=5.5, 6, or 6.5 MHz
100% modulation = ±50 kHz FM deviation
76
80
84
%
B
FM modulation: NTSC Fs=4.5MHz
100% modulation = ±25 kHz FM deviation
76
80
84
%
B
Audio input resistance
45
53
61
K
A
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
+2.0
dB
C
Audio distortion FM
(THD only)
At 1 kHz, 100% modulation (
±50 kHz)
No video
—0.2
0.8
%
C
Audio distortion AM
(THD only)
At 1 kHz, 100% modulation
No video
—1.5
2.5
%
D
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
dB
C
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
45
50
dB
D
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