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AD8390ACP-R2

更新时间： 2024-02-28 21:20:59
品牌 Logo 应用领域
亚德诺 - ADI 放大器
页数 文件大小 规格书
16页 674K
描述
Low Power, High Output Current Differential Amplifier

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AD8390ACP-R2 数据手册

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AD8390  
THEORY OF OPERATION  
APPLICATIONS  
CIRCUIT DEFINITIONS  
R
F
Differential voltage refers to the difference between two node  
voltages. For example, the output differential voltage (or output  
differential-mode voltage) is defined as  
V
CC  
A
R
G
+IN  
–OUT  
I
ADJ  
50kΩ  
50kΩ  
56kΩ  
PWDN0  
PWDN1  
DGND  
R
ADJ  
C
VOUT,DM  
=
(
V+OUT −V−OUT  
)
(1)  
V
EE  
V
OCM  
BYP  
B
V+OUT and V–OUT refer to the voltages at the +OUT and –OUT  
56kΩ  
+OUT  
terminals with respect to a common reference.  
–IN  
R
G
V
AD8390  
EE  
Common-mode voltage refers to the average of the two node  
voltages. The output common-mode voltage is defined as  
R
F
(
V+OUT +V−OUT  
)
Figure 22. Functional Block Diagram  
VOUT ,CM  
=
(2)  
2
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.  
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 VOCM can also  
be assumed to be zero. Starting from these two assumptions, any  
application circuit can be analyzed.  
The third amplifier (C) maintains the common-mode voltage  
(VOCM) at the output of the AD8390. VOCM 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 VOCM 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 VOCM pin as an input to set the dc  
output common-mode voltage. For details, see the Setting the  
Output Common-Mode Voltage section.  
R
F
R
G
+IN  
–IN  
–OUT  
+OUT  
+
–
V
IN,DM  
V
R
V
OCM  
L,DM  
OUT,DM  
+
R
G
–
R
F
Figure 23. Basic Applications Circuit  
(IADJ 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  
VOUT,DM  
RF  
RG  
=
(3)  
(4)  
VIN,DM  
CALCULATING INPUT IMPEDANCE  
The input impedance of the circuit in Figure 23 between the  
inputs (V+IN and V−IN) is simply  
RIN,DM = 2 × RG  
Rev. C | Page 9 of 16  
 
 
 
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AD8390ACP-R2 替代型号

型号 品牌 替代类型 描述 数据表
AD8390ACPZ-R2 ADI

完全替代

 		IC OP-AMP, 3000 uV OFFSET-MAX, PQCC16, 4 X 4 MM, MO-220-VGGC, LFCSP-16, Operational Amplif
AD8390ACP-REEL7 ADI

完全替代

 		Low Power, High Output Current Differential Amplifier

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