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参数资料
| 型号： | MC44C402EVK |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL MC44C402 MTS ENCODER |
| 标准包装： | 1 |
| 主要目的： | 音频，音频处理 |
| 已用 IC / 零件： | MC44C402 |
| 相关产品： | MC44C402ACR2-ND - IC STEREO ENCODER MTS 32-LQFP MC44C402AC-ND - IC STEREO ENCODER MTS 32-LQFP |
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).
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T
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相关代理商/技术参数 |
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|---|---|
| MC44C404 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Stereo Encoder |
| MC44C404_08 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:NICAM 728 - Stereo Encoder |
| MC44C404EP | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:Stereo Encoder |
| MC44C404EPR2 | 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:NICAM 728 - Stereo Encoder |
| MC44C404EVK | 制造商:Freescale Semiconductor 功能描述:NICAM EVAL KIT - Boxed Product (Development Kits) |
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