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參數(shù)資料
| 型號： | AD8390ACP-REEL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Power, High Output Current Differential Amplifier |
| 中文描述： | OP-AMP, 3000 uV OFFSET-MAX, PQCC16 |
| 封裝： | 4 X 4 MM, MO-220-VGGC, LFCSP-16 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 531K |
| 代理商： | AD8390ACP-REEL |
AD8390
THEORY OF OPERATION
Rev. C | Page 9 of 16
0
A
C
B
50k
R
G
R
G
50k
56k
V
CC
56k
V
OCM
BYP
+OUT
AD8390
–OUT
+IN
I
ADJ
PWDN0
R
ADJ
PWDN1
DGND
–IN
V
EE
V
EE
R
F
R
F
Figure 22. Functional Block Diagram
The AD8390 is a true differential operational amplifier with
common-mode feedback. The AD8390 is functionally equivalent
to three op amps, as shown in Figure 22. Amplifiers A and B act
like a standard dual op amp in an inverting configuration that
requires four resistors to set the desired gain.
The third amplifier (C) maintains the common-mode voltage
(V
OCM
) at the output of the AD8390. V
OCM
is internally
generated, as shown in Figure 22. The common-mode feedback
amplifier (C) drives the noninverting terminals of A and B such
that the difference between the output common-mode voltage
and V
OCM
is always zero. This functionality forces the outputs to
sit at midsupply, which results in differential outputs of identical
amplitude and 180 degrees out of phase. The user also has the
option to externally drive the V
OCM
pin as an input to set the dc
output common-mode voltage. For details, see the Setting the
Output Common-Mode Voltage section.
APPLICATIONS
CIRCUIT DEFINITIONS
Differential voltage
refers to the difference between two node
voltages. For example, the output differential voltage (or output
differential-mode voltage) is defined as
(
OUT
OUT
DM
OUT
V
V
V
+
=
,
)
(1)
V
+OUT
and
V
–OUT
refer to the voltages at the +OUT and –OUT
terminals with respect to a common reference.
Common-mode voltage
refers to the average of the two node
voltages. The output common-mode voltage is defined as
(
2
)
,
OUT
OUT
+
CM
OUT
V
V
V
+
=
(2)
ANALYZING A BASIC APPLICATION CIRCUIT
The AD8390 uses high open-loop gain and negative feedback to
force its differential and common-mode output voltages in such
a way as to minimize the differential and common-mode error
voltages. The differential error voltage is defined as the voltage
between the differential inputs +IN and –IN, as shown in
Figure 23. For most purposes, this voltage can be assumed to be
zero. Similarly, the difference between the actual output
common-mode voltage and the voltage applied to V
OCM
can also
be assumed to be zero. Starting from these two assumptions, any
application circuit can be analyzed.
0
R
F
–OUT
+OUT
+IN
–IN
R
G
V
OCM
R
G
R
L,DM
V
OUT,DM
+
–
V
IN,DM
–
+
R
F
Figure 23. Basic Applications Circuit
(I
ADJ
Pin Not Connected, and PWDN0 and PWDN1 Held High)
SETTING THE CLOSED-LOOP GAIN
The differential-mode gain of the circuit in Figure 23 can be
described by
G
F
DM
IN
DM
OUT
V
R
R
V
=
,
,
(3)
CALCULATING INPUT IMPEDANCE
The input impedance of the circuit in Figure 23 between the
inputs (V
+IN
and V
IN
) is simply
G
DM
IN
R
R
×
=
2
,
(4)
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| AD8390ARC-EVAL | Circular Connector; MIL SPEC:MIL-DTL-38999 Series III; Body Material:Metal; Series:D38999 Series III; No. of Contacts:10; Connector Shell Size:13; Connecting Termination:Crimp; Circular Shell Style:Straight Plug; Body Style:Straight RoHS Compliant: No |
| AD8390ARC-REEL | Circular Connector; MIL SPEC:MIL-DTL-38999 Series III; Body Material:Metal; Series:D38999 Series III; No. of Contacts:10; Connector Shell Size:13; Connecting Termination:Crimp; Circular Shell Style:Straight Plug; Body Style:Straight RoHS Compliant: No |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
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