MAX4491AUA+T Maxim Integrated Products, MAX4491AUA+T Datasheet - Page 7

• Manufacturer Part Number: MAX4491AUA+T
• Description: IC OP AMP DUAL R-R I/O 8-UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX4491AUA+T

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Slew Rate: 10 V/µs
• Gain Bandwidth Product: 10MHz
• Current - Input Bias: 50pA
• Voltage - Input Offset: 1500µV
• Current - Supply: 800µA
• Current - Output / Channel: 50mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 5.5 V, ±1.35 V ~ 2.75 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -

In conjunction with op amp output resistance, capaci-
tive loads introduce a pole frequency that can reduce
phase margin and lead to unstable operation. The
MAX4490/MAX4491/MAX4492 drive capacitive loads
up to 300pF without significant degradation of step
response and slew rate (Figure 4). Capacitive-Load
Stability (page 1) shows regions of stable and margin-
ally stable (step overshoot <10%) operation for different
combinations of capacitive and resistive loads.
Figure 3. Step Response With and Without Feedback
Compensation
3a)
3b)
A
A
V
V
= -1, R
= -1, R
WITHOUT FEEDBACK COMPENSATION
WITH FEEDBACK COMPENSATION
_______________________________________________________________________________________
L
L
= 4kΩ, C
= 4kΩ, C
Driving Capacitive Loads
f
f
= 5pF
= 0
Rail-to-Rail I/O Op Amps in SC70
Low-Cost, High-Slew-Rate,
Improve stability for large capacitive loads by adding
an isolation resistor (typically 10Ω) in series with the
output (Figure 5). Note that the isolation resistor forms a
voltage divider with potential for gain error.
MAX4490 TRANSISTOR COUNT: 60
MAX4491 TRANSISTOR COUNT: 120
MAX4492 TRANSISTOR COUNT: 240
SUBSTRATE CONNECTED TO V
Figure 4. Step Response With and Without Capacitive Loading
4a)
4b)
A
A
V
V
= +1, R
= +1, R
WITHOUT CAPACITIVE LOADING
L
L
= 100kΩ, C
WITH CAPACITIVE LOADING
= 100kΩ, C
L
L
= 0
= 300pF
Chip Information
SS
7