4181 查看數據表（PDF） - Maxim Integrated

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4181

Single/Dual/Quad / 270MHz / 1mA / SOT23 / Current-Feedback Amplifiers with Shutdown

Maxim Integrated 

Single/Dual/Quad, 270MHz, 1mA, SOT23,

Current-Feedback Amplifiers with Shutdown

Table 1. Recommended Component Values

MAX4180

MAX4181

COMPONENT/BW

RF (Ω)

RG (Ω)

-3dB BW (MHz)

AV = +2V/V

RL = 1kΩ RL = 150Ω

1.2k

820

1.2k

820

245

190

RL =

100Ω

680

680

190

AV = +5V/V

RL =

1kΩ/150Ω

910

220

120

AV = +10V/V

AV = +1V/V

RL =

1kΩ/150Ω

750

180

RL = 1kΩ

2.4k

—

RL =

150Ω

1k

—

105

270

205

RL =

100Ω

560

—

200

MAX4182/MAX4183

COMPONENT/

BW

AV = +2V/V

RF (Ω)

RG (Ω)

-3dB BW

(MHz)

RL =

1kΩ

1k

1k

245

RL =

150Ω

680

680

190

RL =

100Ω

620

620

160

MAX4184/MAX4185

AV = +1V/V

RL =

1kΩ

1.5k

—

RL =

150Ω

750

—

RL =

100Ω

620

—

270

205

180

MAX4186

AV = +2V/V

RL =

1kΩ

1.1k

1.1k

RL =

150Ω

750

750

RL =

100Ω

680

680

245

190

175

MAX4187

AV = +1V/V

RL =

1kΩ

1.6k

—

RL =

150Ω

910

—

RL =

100Ω

680

—

270

205

200

Choosing Feedback and Gain Resistors

The optimum value of the external-feedback (RF) and

gain-setting (RG) resistors used with the MAX4180–

MAX4187 depends on the closed-loop gain and the

application circuit’s load. Table 1 lists the optimum

resistor values for some specific gain configurations.

One-percent resistor values are preferred to maintain

consistency over a wide range of production lots.

Figures 4a and 4b show the standard inverting and

noninverting configurations. Note that the noninverting

circuit gain (Figure 4) is 1 plus the magnitude of the

inverting closed-loop gain. Otherwise, the two circuits

are identical.

DC and Noise Errors

Several major error sources must be considered in any

op amp. These apply equally to the MAX4180–

MAX4187. Offset-error terms are given by the equation

below. Voltage and current-noise errors are root-square

summed and are therefore computed separately. In

Figure 5, the total output offset voltage is determined by

the following factors:

• The input offset voltage (VOS) times the closed-loop

gain (1 = RF / RG).

• The positive input bias current (IB+) times the source

resistor (RS) (usually 50Ω or 75Ω), plus the negative

input bias current (IB-) times the parallel combination

of RG and RF. In current-feedback amplifiers, the

input bias currents at the IN+ and IN- terminals do

not track each other and may have opposite polarity,

so there is no benefit to matching the resistance at

both inputs.

The equation for the total DC error at the output is:

[ ( ) ] ( ) ( ) VOUT =

IB+ RS +

IB−

RF || RG

+ VOS

1+

RF

RG





The total output-referred noise voltage is:

[ ] [ ] ( ) ( ) ( ) en(OUT) =

1+

RF

RG





2

in+ RS +

in−

RF ||

RG

2

+

en

2

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