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AD8392AACPZ-R2 Folha de dados(PDF) 7 Page - Analog Devices

Nome de Peças AD8392AACPZ-R2
Descrição Electrónicos  Low Power, High Output Current, Quad Op Amp, Dual-Channel ADSL/ADSL2 Line Driver
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

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AD8392A
Rev. 0 | Page 7 of 12
THEORY OF OPERATION
The AD8392A is a current feedback amplifier with high
(500 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,
dVO/dIIN or TZ.
The open-loop transimpedance is analogous to the open-loop
voltage gain of a voltage feedback amplifier. Figure 16 shows a
simplified model of a current feedback amplifier. Because RIN is
proportional to 1/gm, the equivalent voltage gain is TZ × gm,
where gm 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
S
T
S
T
G
V
V
+
×
+
×
=
where:
G
F
R
R
G
+
=1
Ω
50
1 ≈
=
m
IN
g
R
Because G × RIN << RF for low gains, a current feedback
amplifier has relatively constant bandwidth vs. gain, the 3 dB
point being set when |TZ| = RF.
Of course, for a real amplifier there are additional poles that
contribute excess phase, and there is a value for RF below which
the amplifier is unstable. Tolerance for peaking and desired
flatness determines the optimum RF in each application.
RF
VOUT
RG
RN
VIN
RIN
IIN
TZ
Figure 16. Simplified Block Diagram
The AD8392A is capable of delivering 500 mA of output
current while swinging to within 2 V of either power supply
rail. The AD8392A 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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