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參數資料
| 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： | 12/16頁 |
| 文件大?。?/td> | 244K |
| 代理商： | AD830 |
AD830
REV. A
–12–
SUPPLIE S, BY PASSING AND GROUNDING (FIGURE 29)
T he AD830 is capable of operating over a wide range of supply
voltages, both single and dual supplies. T he coupling may be dc
or ac provided the input and output voltages stay within the
specified common-mode voltage limits. For dual supplies, the
device works from
±
4 V to
±
16.5 V. Single supply operation is
possible over +8 V to +33 V. It is also possible to operate the
part with split supply voltages (e.g., +24 V, –5 V) for special
applications such as level shifting. T he primary constraint is that
the total potential between the two supplies does not exceed
33 V.
Inclusion of power supply bypassing capacitors is necessary to
achieve stable behavior and the specified performance. It is es-
pecially important when driving low resistance loads. At a mini-
mum, connect a 0.1
μ
F ceramic capacitor at the supply lead of
the AD830 package. In addition, for the best by passing, we rec-
ommend connecting a 0.01
μ
F ceramic capacitor and 4.7
μ
F
tantalum capacitor to the supply lead going to the AD830.
0.1
μ
F
LOAD
GND
LEAD
V
P
AND
V
N
0.01
μ
F
4.7
μ
F
V
P
AND
V
N
LOAD
GND
LEAD
(a) (b)
Figure 29. Supply Decoupling Options
T he AD830 is designed by its functionality to be capable of
rejecting noise and dissimilar potentials in the ground lines.
T herefore, proper care is necessary to realize the benefits of the
differential amplification of the part. Separation of the input and
output grounds is crucial in rejection of the common mode
noise at the inputs and eliminating any ground drops on the in-
put signal line. For example, connecting the ground of a coaxial
cable to the AD830 output common (board ground) could de-
grade the CMR and also introduce power-down loading on
cable grounds. However, it is also necessary as in any electronic
system, to provide a return path for bias currents back to their
original power supply. T his is accomplished by providing a con-
nection between the differing grounds through a modest imped-
ance labeled Z
CM
(e.g., 100
).
Single Supply Operation
T he AD830 is capable of operating in single power supply appli-
cations down to a voltage of +8 V, with the generalized connec-
tion shown in Figure 30. T here is a constraint on the
common-mode voltage at the input and output which estab-
lishes the range for these voltages. Direct coupling may be used
for input and output voltages which lie in these ranges. Any gain
network applied needs to be referred to the output common
connection or have an appropriate offset voltage. In situations
where the signal lies at a common voltage outside the common
mode range of the AD830 direct coupling will not work, so ac
coupling should be used. A tested application included later in
this data sheet (Figure 42), shows how to easily accomplish cou-
pling to the AD830. For single supply operation where direct
coupling is desired the input and output common-mode curves
(Figures 31 and 32) should be used.
5
8
4
1
2
3
7
6
A=1
AD830
G
M
C
+
–
V
P
+
–
+
–
V
OUT
V
OCM
V
ICM
V
IN
V
OUT
= (V
IN
– V
ICM
) + V
OCM
G
M
Figure 30. General Single Supply Connection
30
28
0
2.0
4
0
12
16
24
1.6
1.2
0.8
0.4
DIFFERENTIAL INPUT VOLTAGE – V
PEAK
C
±
V
8
20
V
P
= +30V
V
P
= +15V
V
P
= +10V
TO GND
Figure 31. Input Common-Mode Range for Single Supply
0
30
4
10
12
16
24
26
22
18
14
SUPPLY VOLTAGE – Volts
M
±
V
8
28
20
TO V
P
TO GND
Figure 32. Output Swing Limit for Single Supply
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