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UTC571 参数 Datasheet PDF下载

UTC571图片预览
型号: UTC571
PDF下载: 下载PDF文件 查看货源
内容描述: COMPANDER完整的压缩机和扩张器于一体的Internet控制 [COMPANDER Complete compressor and expandor in one IChip]
分类和应用:
文件页数/大小: 14 页 / 152 K
品牌: UTC [ Unisonic Technologies ]
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UTC571  
LINEAR INTEGRATED CIRCUIT  
At very low input signal levels the bias current of Q 2 , (typically 50nA), will become significant as it must be  
supplied by Q 5 . Another low level error can be caused by DC coupling into the rectifier. If an offset voltage exists  
between the V IN input pin and the base of Q 2 , an error current of V OS /R 1 will be generated. A mere 1mV of  
offset will cause an input current of 100nA which will produce twice the error of the input bias current. For highest  
accuracy, the rectifier should be coupled into capacitively. At high input levels the β of the PNP Q 6 will begin to  
suffer, and there will be an increasing error until the circuit saturates. Saturation can be avoided by limiting the  
current into the rectifier input to 250mA. If necessary, an external resistor may be placed in series with R 1 to limit  
the current to this value. Figure 7 shows the rectifier accuracy vs input level at a frequency of 1kHz.  
+1  
0
-1  
-40  
-20  
0
RECTIFIER INPUT dBm  
Figure 7. Rectifier Accuracy  
At very high frequencies, the response of the rectifier will fall off. The roll-off will be more pronounced at lower  
input levels due to the increasing amount of gain required to switch between Q 5 or Q 6 conducting. The rectifier  
frequency response for input levels of 0dBm, -20dBm, and -40dBm is shown in Figure 8. The response at all three  
levels is flat to well above the audio range.  
INPUT=0dBm  
0
-20dBm  
-40dBm  
3
10K  
1MEG  
FREQUENCY(Hz)  
Figure 8. Simplified G Cell Schematic  
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