MAX4075ABESA 查看數據表（PDF） - Maxim Integrated

零件编号

产品描述 (功能)

比赛名单

MAX4075ABESA

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 Signal Coupling

and Configurations

Common op amp configurations include both noninvert-

ing and inverting amplifiers. Figures 3–6 show various

single- and dual-supply circuit configurations. In single-

supply systems, use a resistor-divider to bias the nonin-

verting input. A lowpass filter capacitor from the op amp

input to ground (Figure 5) prevents high-frequency

power-supply noise from coupling into the op amp input.

Dual-supply systems can have ground-referenced sig-

nals DC-coupled into the inverting or noninverting inputs.

Supply Bypassing and Board Layout

All devices in this GainAmp family operate from a +2.5V

to +5.5V single supply or from ±1.25V to ±2.75V dual

supplies. For single-supply operation, bypass the power

supply with a 0.1µF capacitor to ground. For dual sup-

plies, bypass each supply to ground. Bypass with

capacitors as close to the device as possible to mini-

mize lead inductance and noise. A printed circuit board

with a low-inductance ground plane is recommended.

Capacitive-Load Stability

Driving large capacitive loads can cause instability in

most low-power, rail-to-rail output amplifiers. The fixed-

gain amplifiers of this GainAmp family are stable with

capacitive loads up to 100pF. Stability with higher

capacitive loads can be improved by adding an isola-

tion resistor in series with the op amp output, as shown

in Figure 7. This resistor improves the circuit’s phase

margin by isolating the load capacitor from the amplifi-

er’s output. In Figure 8, a 220pF capacitor is driven with

a 100Ω isolation resistor exhibiting some overshoot but

no oscillation. Figures 9 and 10 show the typical small-

signal pulse responses of GainAmp fixed-gain ampli-

fiers with 47pF and 100pF capacitive loads and no

isolation resistor

VCC

MAX4074

VIN

RG

RF

VCC

VOUT =

-RF

RG

(VIN)

VIN

RG

MAX4074

VCC

VEE

RF

( ) VOUT = - VIN

RF

RG

Figure 4. Dual-Supply, DC-Coupled Inverting Amplifier

VCC

0.1µF

MAX4074

VCC

( ) VOUT =

VCC

2

- VIN

RF

RG

VIN

RG

RF

Figure 5. Single-Supply, AC-Coupled Inverting Amplifier

VIN

RG

MAX4074

VCC

VEE

RF

( ) VOUT =

VIN

1+

RF

RG

Figure 3. Single-Supply, DC-Coupled Inverting Amplifier with

Negative Input Voltage

Figure 6. Dual-Supply, DC-Coupled Noninverting Amplifier

12 ______________________________________________________________________________________

Share Link: