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參數資料
| 型號： | AD8392ACP-R2 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Power, High Output Current, Quad Op Amp, Dual-Channel ADSL/ADSL2+ Line Driver |
| 中文描述： | QUAD OP-AMP, 5000 uV OFFSET-MAX, QCC32 |
| 封裝： | 5 X 5 MM, MO-220VHHD, LFCSP-32 |
| 文件頁數： | 11/16頁 |
| 文件大小： | 529K |
| 代理商： | AD8392ACP-R2 |
AD8392
THEORY OF OPERATION
The AD8392 is a current feedback amplifier with high (400 mA)
output current capability. With a current feedback amplifier, the
current into the inverting input is the feedback signal, and the
open-loop behavior is that of a transimpedance, dV
O
/dI
IN
or T
Z
.
Rev. 0 | Page 11 of 16
The open-loop transimpedance is analogous to the open-loop
voltage gain of a voltage feedback amplifier. Figure 33 shows a
simplified model of a current feedback amplifier. Since R
IN
is
proportional to 1/g
m
, the equivalent voltage gain is just T
Z
× g
m
,
where g
m
is the transconductance of the input stage. Basic
analysis of the follower with gain circuit yields
( )
×
( )
F
IN
Z
Z
IN
O
R
R
G
T
T
G
V
V
+
+
×
=
where:
G
F
R
R
G
+
=
1
Ω
50
1
≈
=
m
IN
g
R
Since G × R
IN
<< R
F
for low gains, a current feedback amplifier
has relatively constant bandwidth versus gain, the 3 dB point
being set when |T
Z
| = R
F
.
Of course, for a real amplifier there are additional poles that
contribute excess phase, and there is a value for R
F
below which
the amplifier is unstable. Tolerance for peaking and desired
flatness determines the optimum R
F
in each application.
0
R
F
V
OUT
R
G
R
N
V
IN
R
IN
I
IN
T
Z
Figure 33. Simplified Block Diagram
The AD8392 is capable of delivering 400 mA of output current
while swinging to within 2 V of either power supply rail. The
AD8392 also has a power management system included on-chip.
It features four user-programmable power levels (three active
power modes as well as the provision for complete shutdown).
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相關代理商/技術參數 |
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|---|---|
| AD8392ACP-REEL | 制造商:Analog Devices 功能描述: |
| AD8392ACP-REEL7 | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述: |
| AD8392ACPZ-RL | 制造商:Analog Devices 功能描述:ADSL Driver Quad 40MHz 32-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:Dual Port ADSL/ADSL+Line Driver |
| AD8392ACPZ-RL7 | 制造商:Analog Devices 功能描述:ADSL Driver Quad 40MHz 32-Pin LFCSP EP T/R 制造商:Analog Devices 功能描述:ADSL DRVR QUAD 40MHZ 32LFCSP EP - Tape and Reel |
| AD8392ARE | 制造商:Analog Devices 功能描述:ADSL Driver Quad 40MHz 28-Pin TSSOP EP 制造商:Analog Devices 功能描述:ADSL DRVR QUAD 40MHZ 28TSSOP EP - Rail/Tube |
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