MAX4492 Maxim, MAX4492 Datasheet - Page 6

• Manufacturer Part Number: MAX4492
• Description: The MAX4490/MAX4491/MAX4492 single/dual/quad, low-cost CMOS op amps feature rail-to-rail input and output capability from either a single +2
• Manufacturer: Maxim

pole at frequency (2πR′C
combination of the gain-setting resistors for the invert-
ing or noninverting amplifier configuration (Figure 2). If
the pole frequency is less than or comparable to the
unity-gain bandwidth (10MHz), the phase margin will
be reduced, and the amplifier will exhibit degraded
AC performance through either ringing in the step
response or sustained oscillations. The pole frequency is
10MHz when R′ = 3.2kΩ. To maximize stability, R′ <3kΩ
is recommended.
Applications that require rail-to-rail operation with mini-
mal loading (for small V
typically require R′ values >3kΩ. To improve step
response under these conditions, connect a small
Low-Cost, High-Slew-Rate,
Rail-to-Rail I/O Op Amps in SC70
Figure 1a. Output Source Current vs. Temperature
Figure 1b. Output Sink Current vs. Temperature
6
_______________________________________________________________________________________
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
-40
-40
-25
-25
V
-10
-10
DD
V
DD
= 2.7V
5 20 35 50 65 80
5 20 35
= 2.7V
TEMPERATURE (°C)
TEMPERATURE (°C)
DD
IN
)
-1
- V
50
, where R′ is the parallel
V
V
V
OH
V
V
V
DD
DD
DD
DD
DD
DD
65
- V
- V
- V
- V
- V
- V
80
and V
OH
OH
OH
V
OH
OH
OH
DD
V
= 200mV
= 100mV
= 50mV
DD
95 110
95
= 200mV
= 100mV
= 50mV
= 5V
= 5V
110
OL
125
125
- V
SS
) will
capacitor C
Choose C
where R
ting resistor (Figure 2).
Figure 3 shows the step response for a noninverting
amplifier subject to R′ = 4kΩ with and without the C
feedback capacitor.
Figure 2. Inverting and Noninverting Amplifier with Feedback
Compensation
f
V
is the feedback resistor and R is the gain-set-
INVERTING
NONINVERTING
IN
f
as follows:
f
between the inverting input and output.
R
R
V
C
IN
f
= 5(R / R
MAX4490
MAX4490
C
R
R
C
f
f
f
f
f
) [pf]
R′ = R || R
R
R′ = R || R
R
f
C
f
C
f
f
= RC
= RC
IN
f
IN
f
V
V
OUT
OUT
f