AD8396_15 datasheet(8/12 Pages) AD

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AD8396 数据表(PDF) 8 Page - Analog Devices

部件名	AD8396

功能描述	Low Power, High Output Current

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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AD8396

Rev. C | Page 8 of 12

THEORY OF OPERATION

The AD8396 is a current feedback amplifier with high 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 13 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 the gain circuit yields

)

(

(S)

where:

= 1 + RF/RG

RIN

= 1/gm ≈ 50 Ω

Because G × RIN << RF for low gains, a current feedback amplifier

has relatively constant bandwidth vs. gain. The 3 dB point is set

when |TZ| = RF.

In a nonideal 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.

VOUT

RIN

IIN

VIN

Figure 13. Simplified Block Diagram

类似零件编号 - AD8396_15

制造商	部件名	数据表	功能描述
Analog Devices	AD8390	531Kb / 16P	Low Power, High Output Current Differential Amplifier REV. C
	AD8390A	387Kb / 12P	Low Power, High Output Current Differential Amplifier REV. B
	AD8390AACPZ-R2	387Kb / 12P	Low Power, High Output Current Differential Amplifier REV. B
	AD8390AACPZ-R2	471Kb / 13P	Low Power, High Output Current Differential Amplifier
	AD8390AACPZ-R7	387Kb / 12P	Low Power, High Output Current Differential Amplifier REV. B

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类似说明 - AD8396_15

制造商	部件名	数据表	功能描述
Analog Devices	AD8392	1Mb / 16P	Low Power, High Output Current REV. A
	AD8392A	553Kb / 12P	Low Power, High Output Current REV. 0
	AD8394	67Kb / 2P	Low Power, High Output Current Rev. Sp0
	AD8390A	471Kb / 13P	Low Power, High Output Current Differential Amplifier
	AD8390AACPZ-R7	387Kb / 12P	Low Power, High Output Current Differential Amplifier REV. B
	AD8390	531Kb / 16P	Low Power, High Output Current Differential Amplifier REV. C
	AD8390A	387Kb / 12P	Low Power, High Output Current Differential Amplifier REV. B
ON Semiconductor	MC33178	262Kb / 12P	HIGH OUTPUT CURRENT LOW POWER, LOW NOISE OPERATIONAL AMPLIFIERS 1996 REV 0
Unisonic Technologies	MC33178	151Kb / 6P	HIGH OUTPUT CURRENT LOW NOISE, LOW POWER OPERATIONAL AMPLIFIERS
Analog Devices	AD8016	707Kb / 21P	Low Power, High Output Current xDSL Line Driver REV. C

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