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AD8390AACPZ-R7 数据表(PDF) 10 Page - Analog Devices

部件名 AD8390AACPZ-R7
功能描述  Low Power, High Output Current Differential Amplifier
Download  13 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD8390AACPZ-R7 数据表(HTML) 10 Page - Analog Devices

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Data Sheet
AD8390A
Rev. C | Page 9 of 12
THEORY OF OPERATION
56kΩ
56kΩ
VCC
VCC
VCOM
OUTP
AD8390A
OUTN
INP
INN
VEE
VEE
C
A
B
56kΩ
56kΩ
Figure 15. Functional Block Diagram
The AD8390A is a true differential amplifier with common-
mode feedback. The AD8390A is functionally equivalent to three
amplifiers, as shown in Figure 15. Amplifier A and Amplifier B
form a standard dual amplifier in an inverting configuration.
Amplifier C maintains the common-mode voltage VCOM at
the output.
With VCOM left unconnected, the outputs are internally biased
to midsupply. VCOM can be driven externally to set the dc
output common-mode voltage.
RF
OUTN
OUTP
INP
INN
RG
VCOM
RG
RL, DM VOUT, DM
+
VIN, DM
+
RF
Figure 16. Basic Application Circuit
The high open-loop gain of the AD8390A and the negative
feedback minimize the differential and common-mode error
voltages.
With the differential and common-mode error voltages assumed
to be 0, the differential-mode gain and input impedance of the
basic application circuit shown in Figure 16 are as follows:
G
F
DM
IN
DM
OUT
R
R
V
V
,
,
G
DM
IN
R
R
 2
,


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