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參數(shù)資料
| 型號： | MC44C402ACR2 |
| 廠商： | Freescale Semiconductor |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC STEREO ENCODER MTS 32-LQFP |
| 標準包裝： | 2,000 |
| 類型： | 音頻編碼器 |
| 應用： | 機頂盒，視頻播放器，錄音機 |
| 電壓 - 電源，模擬： | 2.97 V ~ 3.63 V |
| 電壓 - 電源，數(shù)字： | 1.62 V ~ 1.98 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 32-LQFP |
| 供應商設(shè)備封裝： | 32-TQFP（7x7） |
| 包裝： | 帶卷 (TR) |
| 配用： | MC44C402EVK-ND - KIT EVAL MC44C402 MTS ENCODER |
6
Freescale Semiconductor
MC44C402
Figure 5. Amplitude Ripple
Figure 6. Amplitude-Notch
SYSTEM APPLICATION NOTES
DESIGN CONSIDERATIONS
When developing application using the MC44C402 Stereo
Encoder, the user can significantly improve the performance
by following the suggestions below:
1.
Disable the pre-emphasis on the modulator
2.
There must be a 4.5 MHz notch in the video because
Video spectra that fall into the 4.5 MHz range will
severely impact the audio performance. See the notch
filter shown in Figure 7.
3.
Measurements must be made with a precision
demodulator followed by a precision decoder,
measuring audio performance using mono or wide band
output will give erroneous results. We suggest the setup
as described below
Equipment suggestions
Demodulator: Tektronix
TV1450
Decoder:
Modulation Sciences
SRD-1
4.
A low pass filter is required on the CA (baseband)
output. The filter shown in Figure 7 note 1 is
recommended. It is a Bessell filter with uniform group
delay to 50 kHz and an input impedance of 500
and
high output impedance.
5.
Crystal frequency is critical. It MUST be within +/- 2 kHz
(100 PPM) under all conditions. Recommend 30 PPM
or better at room temperature. Measure the frequency,
being careful not to load the crystal oscillator pins or
alternatively the frequency can be determined by
measuring the 4 MHz using (spectrum analyzer), being
careful not to load the crystal oscillator pins, or with a
frequency counter on the 4 MHz port to +/- 400 Hz max
or 100 Hz at room temp. A symptom of the crystal being
off frequency is stereo separation changing at about a
1 Hz rate (Pulsing).
-5
+5
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-1
+0
+1
+2
+3
+4
d
B
r
A
20
10k
50
100
200
500
1k
2k
5k
Hz
-50
+5
-45
-40
-35
-30
-25
-20
-15
-10
-5
+0
d
B
r
A
14k
17k
14.5k
15k
15.5k
16k
16.5k
Hz
T
TT
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC44C402EVK | 功能描述:音頻 IC 開發(fā)工具 STEREO 402 EVAL KIT RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V |
| MC44C404 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Stereo Encoder |
| MC44C404_08 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:NICAM 728 - Stereo Encoder |
| MC44C404EP | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Stereo Encoder |
| MC44C404EPR2 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:NICAM 728 - Stereo Encoder |
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