参数资料
型号: AD8392AACPZ-RL
厂商: Analog Devices Inc
文件页数: 10/12页
文件大小: 0K
描述: IC LINE DRVR ADSL/ADSL 32-LFCSP
标准包装: 5,000
类型: 驱动器
驱动器/接收器数: 2/0
规程: xDSL
电源电压: 5 V ~ 24 V
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘,CSP
供应商设备封装: 32-LFCSP-VQ(5x5)
包装: 带卷 (TR)
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
IN
O
R
G
S
T
S
T
G
V
+
×
+
×
=
where:
G
F
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.
0
64
77-
022
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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