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MAX4274BJESA

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
MAX4174/5, MAX4274/5, MAX4281/2/4
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
______________________________________________________________________________________ 13
GainAmp Signal Coupling
and Configurations
Common op-amp configurations include both nonin-
verting and inverting amplifiers. Figures 5–8 show vari-
ous single and dual-supply circuit configurations.
Single-supply systems benefit from a midsupply bias
on the noninverting input (provided internally on
MAX4175/MAX4275), as this produces a quiescent DC
level at the center of the rail-to-rail output stage signal
swing. For dual-supply systems, ground-referenced
signals may be DC-coupled into the inverting or non-
inverting inputs.
IN_+ Filter on MAX4175/MAX4275
Internal resistor biasing of the V
CC
/ 2 bias options cou-
ples power-supply noise directly to the op amp’s nonin-
verting input. To minimize high-frequency power-supply
noise coupling, add a 1µF to 0.1µF capacitor from IN+
to ground to create a lowpass filter (Figure 6). The low-
pass filter resulting from the internal bias resistors and
added capacitor can help eliminate higher frequency
power-supply noise coupling through the noninverting
input.
MAX4281
V
CC
V
CC
R
G
R
F
V
IN
V
OUT
=
-R
F
(V
IN
)
R
G
Figure 4. Single-Supply, DC-Coupled Inverting Amplifier with
Negative Input Voltage
MAX4175
V
CC
R
G
R
B
R
B
R
F
V
IN
0.1µF
V
OUT
=
V
CC
- V
IN
(
R
F
)
2 R
G
Figure 6. Single-Supply, AC-Coupled Inverting Amplifier
MAX4174
V
EE
V
CC
R
G
R
F
V
IN
V
OUT
= - V
IN
(
R
F
)
R
G
Figure 5. Dual-Supply, DC-Coupled Inverting Amplifier
MAX4174
V
EE
V
CC
R
G
R
F
V
IN
V
OUT
= V
IN
(
1+
R
F
)
R
G
Figure 7. Dual-Supply, AC-Coupled Noninverting Amplifier
MAX4174/5, MAX4274/5, MAX4281/2/4
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
14 ______________________________________________________________________________________
MAX4174
V
EE
V
CC
R
G
R
F
R
ISO
C
L
R
L
OUTPUT
INPUT
Figure 9. Dual-Supply, Capacitive-Load Driving Circuit
Figure 10. Small-Signal/Large-Signal Transient Response with
Excessive Capacitive Load with Isolation Resistor
A
V
= +5V/V
50mV/div
INPUT
OUTPUT
OUTPUT
A
V
= +5V/V
500mV/div
Supply Bypassing and Board Layout
All devices in the 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 supplies, bypass each supply to ground. Bypass
with capacitors as close to the device as possible, to min-
imize 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 470pF. Stability with higher
capacitive loads can be improved by adding an isolation
resistor in series with the op-amp output, as shown in
Figure 9. This resistor improves the circuit’s phase mar-
gin by isolating the load capacitor from the amplifier’s
output. In Figure 10, a 1000pF capacitor is driven with a
100Ω isolation resistor exhibiting some overshoot but no
oscillation. Figures 11 and 12 show the typical small-sig-
nal pulse responses of GainAmp fixed-gain amplifiers
with 250pF and 470pF capacitive loads and no isolation
resistor.
MAX4174
V
EE
V
CC
R
G
R
F
V
IN
V
OUT
= V
IN
(
1+
R
F
)
R
G
Figure 8. Dual-Supply, DC-Coupled Noninverting Amplifier
MAX4174/5, MAX4274/5, MAX4281/2/4
SOT23, Rail-to-Rail, Fixed-Gain
GainAmps/Open-Loop Op Amps
______________________________________________________________________________________ 15
2µs/div
INPUT
A
V
= +1.25V/V
OUTPUT
50mV/div
A
V
= +3V/V
OUTPUT
50mV/div
A
V
= +5V/V
OUTPUT
50mV/div
A
V
= +10V/V
OUTPUT
50mV/div
A
V
= +25V/V
OUTPUT
50mV/div
A
V
= +51V/V
OUTPUT
50mV/div
Figure 11. MAX4174/MAX4175 Small-Signal Pulse Response
(C
L
= 250pF, R
L
= 100k
Ω
)
Figure 12. MAX4174/MAX4175 Small-Signal Pulse Response
(C
L
= 470pF, R
L
= 100k
Ω
)
2µs/div
INPUT
A
V
= +1.25V/V
OUTPUT
50mV/div
A
V
= +3V/V
OUTPUT
50mV/div
A
V
= +5V/V
OUTPUT
50mV/div
A
V
= +10V/V
OUTPUT
50mV/div
A
V
= +25V/V
OUTPUT
50mV/div
A
V
= +51V/V
OUTPUT
50mV/div
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MAX4274BJESA

Mfr. #:
Buy MAX4274BJESA
Manufacturer:
Maxim Integrated
Description:
Operational Amplifiers - Op Amps Integrated Circuits (ICs)
Lifecycle:
New from this manufacturer.
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