MAX4412EUK-T(2000) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX4412EUK-T
(Rev.:2000)

Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz Single-Supply Op Amps with Rail-to-Rail Outputs

Maxim Integrated 

Low-Cost, Low-Power, Ultra-Small, 3V/5V, 500MHz

Single-Supply Op Amps with Rail-to-Rail Outputs

Inverting and Noninverting Configurations

Select the gain-setting feedback (RF) and input (RG)

resistor values that best fit the application. Large resis-

tor values increase voltage noise and interact with the

amplifier’s input and PC board capacitance. This can

generate undesirable poles and zeros and decrease

bandwidth or cause oscillations. For example, a nonin-

verting gain-of-two configuration (RF = RG) using 1kΩ

resistors, combined with 1.8pF of amplifier input capac-

itance and 1pF of PC board capacitance, causes a

pole at 114MHz. Since this pole is within the amplifier

bandwidth, it jeopardizes stability. Reducing the 1kΩ

resistors to 100Ω extends the pole frequency to

1.14GHz, but could limit output swing by adding 200Ω

in parallel with the amplifier’s load resistor.

Note: For high-gain applications where output offset

voltage is a consideration, choose RS to be equal to the

parallel combination of RF and RG (Figures 3a and 3b):

RS

=

RF × RG

RF + RG

Video Line Driver

The MAX4412/MAX4413 are designed to minimize dif-

ferential gain error and differential phase error to 0.01%/

0.03° respectively, making them ideal for driving video

loads.

Active Filters

The low distortion and high bandwidth of the

MAX4412/MAX4413 make them ideal for use in active

filter circuits. Figure 4 is a 15MHz lowpass, multiple-

feedback active filter using the MAX4412.

GAIN = R2

R1

RG

RF

VIN

RBIN

RISO

VOUT

CL

Figure 1. Driving a Capacitive Load Through an Isolation

Resistor

RG

RS

IN

RF

VOUT

R0

VOUT = [1+ (RF / RG)] VIN

ISOLATION RESISTANCE vs.

CAPACITIVE LOAD

30

28

26

24

22

20

18

16

14

12

10

0

200 400 600 800 1000

CLOAD (pF)

Figure 2. Isolation Resistance vs. Capacitive Load

Figure 3a. Noninverting Gain Configuration

RG

IN

RS

RF

VOUT

RO

VOUT = (RF / RG) VIN

Figure 3b. Inverting Gain Configuration

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