LM6218WM National Semiconductor, LM6218WM Datasheet - Page 7

• Manufacturer Part Number: LM6218WM
• Description: IC OP AMP DUAL FST SETLNG 14SOIC
• Manufacturer: National Semiconductor
• Series: VIP™r

Specifications of LM6218WM

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Slew Rate: 140 V/µs
• Gain Bandwidth Product: 17MHz
• Current - Input Bias: 200nA
• Voltage - Input Offset: 200µV
• Current - Supply: 5.5mA
• Current - Output / Channel: 20mA
• Voltage - Supply, Single/dual (±): ±5 V ~ 20 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (7.5mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Output Type: -
• -3db Bandwidth: -
• Other names: *LM6218WM

Application Information
50 . Connect a small capacitor directly from the amplifier
output to the inverting input. The feedback loop is closed
from the isolated output with a series resistor to the inverting
input.
For C
Settling time to 0.01%, 10V Step
For C
For C
L
= 1000 pF, Small signal BW = 5 MHz
L
L
= 1000 pF, settling time
= 300 pF, settling time
20 V
p-p
BW = 500 kHz
Voltage Follower
Inverter
500 ns
1500 ns
DS010254-10
(Continued)
DS010254-11
7
Examples of unity gain connections for a voltage follower,
Inverter, and integrator driving capacitive loads up to
1000 pF are shown here. Different R1–C1 time constants
and capacitive loads will have an effect on settling times.
Input Bias Current Compensation
Input bias current of the first op amp can be reduced or
balanced out by the second op amp. Both amplifiers are laid
out in mirror image fashion and in close proximity to each
other, thus both input bias currents will be nearly identical
and will track with temperature. With both op amp inputs at
the same potential, a second op amp can be used to convert
bias current to voltage, and then back to current feeding the
first op amp using large value resistors to reduce the bias
current to the level of the offset current.
Examples are shown here for an inverting application, (a)
where the inputs are at ground potential, and a second
circuit (b) for compensating bias currents for both inputs.
Integrator
DS010254-12
www.national.com