參數(shù)資料
型號(hào)： MAX421
廠商： Maxim Integrated Products, Inc.
英文描述： &#177.15V Chopper Stabilized Op Amps
中文描述： ±15V斬波自穩(wěn)零型運(yùn)算放大器
文件頁(yè)數(shù)： 13/20頁(yè)
文件大?。?/td> 359K
代理商： MAX421
M
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
OUT
= -R
F
(V
IN
)
V
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
0.1
μ
F
OUT
= V
CC
- V
IN
(
R
F
)
V
G
Figure 6. Single-Supply, AC-Coupled Inverting Amplifier
MAX4174
V
EE
V
CC
R
G
R
F
V
IN
OUT
= - V
IN
(
R
F
)
V
G
Figure 5. Dual-Supply, DC-Coupled Inverting Amplifier
MAX4174
V
EE
V
CC
R
G
R
F
V
IN
OUT
= V
IN
(
1+ R
F
)
V
G
Figure 7. Dual-Supply, AC-Coupled Noninverting Amplifier
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