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參數(shù)資料
| 型號： | AD830 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 運動控制電子 |
| 英文描述： | High Speed, Video Difference Amplifier(高速,視頻差分運放) |
| 中文描述： | 高速，視頻差分放大器（高速，視頻差分運放） |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 244K |
| 代理商： | AD830 |
AD830
REV. A
–10–
INT E RFACING T HE INPUT
Common-Mode Voltage Range
T he common-mode range of the AD830 is defined by the am-
plitude of the differential input signal and the supply voltage.
T he general definition of common-mode voltage, V
CM
, is usu-
ally applied to a symmetrical differential signal centered about a
particular voltage as illustrated by the diagram in Figure 23.
T his is the meaning implied here for common-mode voltage.
T he internal circuitry establishes the maximum allowable volt-
age on the input or feedback pins for a given supply voltage.
T his constraint and the differential input voltage sets the
common-mode voltage limit. Figure 24 shows a curve of the
common-mode voltage range vs. differential voltage for three
supply voltage settings.
V
MAX
V
PEAK
V
CM
Figure 23. Common-Mode Definition
15
0
2.0
3
0
6
9
12
1.6
1.2
0.8
0.4
DIFFERENTIAL INPUT VOLTAGE – V
PEAK
+V
CM
±
15V = V
S
±
10V = V
S
±
5V = V
S
+V
CM
+V
CM
–V
CM
–V
CM
–V
CM
C
±
V
Figure 24. Input Common-Mode Voltage Range vs.
Differential Input Voltage
Differential Voltage Range
T he maximum applied differential voltage is limited by the clip-
ping range of the input stages. T his is nominally set at 2.4 volts
magnitude and depicted in the crossplot (X -Y) photo of Figure
25. T he useful linear range of the input stages is set at 2 volts,
but is actually a function of the distortion required for a particu-
lar application. T he distortion increases for larger differential
input voltages. A plot of relative distortion versus input differen-
tial voltage is shown in Figures 8 and 11 in the T ypical Charac-
teristics section. T he distortion characteristics could impose a
secondary limit to the differential input voltage for high accu-
racy applications.
10
90
100
0%
1V
1V
Figure 25. Clipping Behavior
15
0
20
3
0
6
9
12
16
12
8
4
SUPPLY VOLTAGE – Volts
M
±
V
V
P
V
N
Figure 26. Maximum Output Swing vs. Supply
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