MAX4075BLEUA 查看數據表（PDF） - Maxim Integrated

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MAX4075BLEUA

Micropower, SOT23, Rail-to-Rail, Fixed-Gain, GainAmp/Open-Loop Op Amps

Maxim Integrated 

Micropower, SOT23, Rail-to-Rail,

Fixed-Gain, GainAmp/Open-Loop Op Amps

GainAmp Bandwidth

GainAmp fixed-gain amplifiers feature factory-trimmed

precision resistors to provide fixed inverting gains from

-0.25V/V to -100V/V or noninverting gains from +1.25V/V

to +101V/V. The op amp core is decompensated strate-

gically over the gain-set options to maximize band-

width. Open-loop decompensation increases GBW

product, ensuring that usable bandwidth is maintained

with increasing closed-loop gains. A GainAmp with a

fixed gain of AV = +25V/V has a -3dB bandwidth of

120kHz. By comparison, a unity-gain-stable op amp con-

figured for AV = +25V/V would yield a -3dB bandwidth

of only 8kHz. Decompensation is performed at five inter-

mediate gain sets, as shown in the Gain Selector

Guide.

High-Voltage (±17V)

Input Fault Protection

The MAX4074/MAX4075 family includes ±17V input

fault protection. For normal operation, see the input

voltage range specification in the Electrical Character-

istics. Overdriven inputs up to ±17V will not cause out-

put phase reversal. A back-to-back SCR structure at

the input pins allows either input to safely swing ±17V

relative to VEE (Figure 2). Additionally, the internal op

amp inputs are diode clamped to both supply rails for

the protection of sensitive input stage circuitry. Current

through the clamp diodes is limited by a 5kΩ resistor at

the noninverting input, and by RG at the inverting input.

An IN+ or IN- fault voltage as high as ±17V causes less

than 3.5mA to flow through the input pin, protecting

both the GainAmp and the signal source from damage.

Applications Information

GainAmp fixed-gain amplifiers offer a precision, fixed-

gain amplifier in a small package that can be used in a

variety of circuit board designs. GainAmp fixed-gain

amplifiers can be used in many op amp circuits that

use resistive negative feedback to set gain, and do not

require other connections to the op amp inverting input.

Both inverting and noninverting op amp configurations

can be implemented easily using a GainAmp.

GainAmp Input Voltage Range

The MAX4074/MAX4075 combine both an op amp and

gain-setting feedback resistors on the same IC. The

inverting input voltage range is different from the nonin-

verting input voltage range because the inverting input

pin is connected to the RG input series resistor. Just as

with a discrete design, take care not to saturate the

inputs/output of the core op amp to avoid signal distor-

tions or clipping.

RF

IN-

RG

17V

SCR

OUT

VEE

VCC

IN+

5k

17V

SCR

VEE

VEE

MAX4074

MAX4075

Figure 2. Input Protection

NOTE: INPUT STAGE PROTECTION INCLUDES TWO 17V SCRs

AND TWO DIODES AT THE INPUT STAGE.

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