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CXA2502 参数 Datasheet PDF下载

CXA2502图片预览
型号: CXA2502
PDF下载: 下载PDF文件 查看货源
内容描述: 杜比BC型降噪系统播放 [Dolby B-C Type Noise Reduction System for Playback]
分类和应用:
文件页数/大小: 11 页 / 211 K
品牌: SONY [ SONY CORPORATION ]
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CXA2502M  
Application Note  
The CXA2502M is a stereo Dolby B-C type NR IC like the CXA1560 series.  
Few external parts and smaller package can be achieved because this IC has a built-in spectral skewing circuit  
and the reduced number of pins for playback.  
1) Power Supply  
The CXA2502M is designed to operate on either single or dual power supply.  
For dual power supply, connect VCT pin to GND, and GND pin to the negative power supply.  
For single power supply, connect GND pin to GND. VCC/2, generated from the internal circuit, is output to  
VCT pin.  
Connect a by-pass capacitor between this pin and GND.  
The operating voltage range is 7.0 to 16V, which satisfies the signal handling of 12dB specified by the Dolby  
Laboratories.  
2) Operation Mode Control  
The CXA2502M has built-in electronic switches. The operations are controlled by the DC voltages of NRSW  
and MODE control pins. Table 1 shows the switching truth tables.  
For single power supply, VH, VM and VL correspond to VCC, VCC/2 and GND, respectivery.  
For dual power supply, VH, VM and VL correspond to VCC, GND and VEE, respectively.  
Refer to "threshold" on the characteristics graph for the thresholds of the control voltages. NRSW and MODE  
control pins are connected to VCT via a 50kresistor, so when the pin is open, VM condition results.  
VH  
C type  
VM  
VL  
NRSW  
MODE  
B type  
TAPE  
NR OFF  
AUX  
Table 1  
3) Reference level  
The CXA2502M Dolby level is –6dBm (388mVrms). The reference level of the playback input pin (PB IN) is  
defined as the levels which provide the line output level to the line output pin (LINE OUT) in NR OFF mode.  
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