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AD830JR 参数 Datasheet PDF下载

AD830JR图片预览
型号: AD830JR
PDF下载: 下载PDF文件 查看货源
内容描述: 高速视频差动放大器 [High Speed, Video Difference Amplifier]
分类和应用: 放大器
文件页数/大小: 16 页 / 336 K
品牌: ADI [ ADI ]
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AD830  
AC CO UP LED LINE RECEIVER  
becomes troublesome. For dual supply operation, the 10 kΩ  
resistors may go directly to ground. T he output common is con-  
veniently set by a Zener diode for a low impedance reference to  
preserve the high frequency CMR. However, a simple resistive  
divider will work fine and good high frequency CMR can be  
maintained by placing a compensating resistor in series with the  
+Y input. T he excellent CMRR response of the circuit is shown  
in Figure 43. A plot of the 0.1 dB flatness from 10 Hz is also  
shown. With the use of 10 µF capacitors, the CMR is >90 dB  
down to a few tens of hertz. T his level of performance is almost  
impossible to achieve with discrete solutions.  
T he AD830 is configurable as an ac coupled differential ampli-  
fier on a single or bipolar supply voltages. All that is needed is  
inclusion of a few noncritical passive components as illustrated  
below in Figure 42. A simple resistive network at the X GM  
input establishes a common-mode bias. Here, the common  
mode is centered at 6 volts, but in principle can be any voltage  
within the common-mode limits of the AD830. T he 10 kre-  
sistors to each input bias the X GM stage with sufficiently high  
impedance to keep the input coupling corner frequency low, but  
not too large so that residual bias current induced offset voltage  
+12V  
INPUT  
10µF  
0.1µF  
AD830  
SIGNAL  
8
1
75  
COAX  
G
M
R
T
V
CABLE  
75Ω  
OUT  
2
3
4
7
6
5
Z
CM  
A=1  
10µF  
1000µF  
10kΩ  
10kΩ  
2k*  
75Ω  
+V  
S
G
M
C
10kΩ  
+12V  
4.7kΩ  
10kΩ  
*OPTIONAL TUNING FOR  
IMPROVING VERY LOW  
FREQUENCY CMR.  
6.8V  
1N4736  
Figure 42. AC Coupled Line Receiver  
120  
100  
80  
1
0
WITH CIRCUIT TRIMMED  
USING EXTERNAL 2k  
POTENTIOMETER  
–0.1  
–0.2  
–0.3  
–0.4  
–0.5  
WITHOUT EXTERNAL  
2kPOTENTIOMETER  
60  
–0.6  
–0.7  
–0.8  
40  
–0.9  
10  
20  
100  
1k  
10k  
100k  
1M  
10M  
10  
100  
1k  
10k  
100k  
1M  
10M  
100M  
FREQUENCY – Hz  
FREQUENCY – Hz  
Figure 44. Am plitude Response vs. Frequency for Line  
Receiver  
Figure 43. Com m on-Mode Rejection vs. Frequency for  
Line Receiver  
REV. A  
–15–