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參數(shù)資料
| 型號(hào)： | AD8392AAREZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC LINE DRVR ADSL/ADSL 28-TSSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 驅(qū)動(dòng)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 2/0 |
| 規(guī)程： | xDSL |
| 電源電壓： | 5 V ~ 24 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-SOIC（0.173"，4.40mm 寬）裸露焊盤(pán) |
| 供應(yīng)商設(shè)備封裝： | 28-HTSSOP |
| 包裝： | 帶卷 (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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| AD8392ACP-R2 | 制造商:Analog Devices 功能描述: 制造商:Rochester Electronics LLC 功能描述: |
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