LMV822MMX National Semiconductor, LMV822MMX Datasheet - Page 12

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LMV822MMX

Manufacturer Part Number
LMV822MMX
Description
Manufacturer
National Semiconductor
Type
General Purpose Amplifierr
Datasheet

Specifications of LMV822MMX

Rail/rail I/o Type
Rail to Rail Output
Number Of Elements
2
Unity Gain Bandwidth Product
5.6MHz
Slew Rate
2V/us
Common Mode Rejection Ratio
72dB
Input Offset Voltage
3.5mV
Input Bias Current
100nA
Single Supply Voltage (typ)
2.7/5V
Dual Supply Voltage (typ)
Not RequiredV
Voltage Gain In Db
105dB
Power Supply Rejection Ratio
75dB
Power Supply Requirement
Single
Shut Down Feature
No
Single Supply Voltage (min)
2.5V
Single Supply Voltage (max)
5.5V
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
MSOP
Lead Free Status / Rohs Status
Not Compliant

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Application Note
UNITY GAIN PULSE RESPONSE CONSIDERATION
A pull-up resistor is well suited for increasing unity-gain,
pulse response stability. For example, a 600 Ω pull-up resis-
tor reduces the overshoot voltage by about 50%, when
driving a 220 pF load. Figure 3 shows how to implement the
pull-up resistor for more pulse response stability.
Higher capacitances can be driven by decreasing the value
of the pull-up resistor, but its value shouldn’t be reduced
beyond the sinking capability of the part. An alternate ap-
proach is to use an isolation resistor as illustrated in Figure 4
.
Figure 5 shows the resulting pulse response from a LMV824,
while driving a 10,000 pF load through a 20Ω isolation
resistor.
FIGURE 4. Using an Isolation Resistor to Drive Heavy
FIGURE 3. Using a Pull-up Resistor at the Output for
FIGURE 2. Unity-Gain Frequency vs Common Mode
Stabilizing Capacitive Loads
Voltage for Various Loads
Capacitive Loads
(Continued)
10012841
10012861
10012843
12
INPUT BIAS CURRENT CONSIDERATION
Input bias current (I
offset voltage. This offset is primarily due to I
through the negative feedback resistor, R
is 90 nA (max
mV will be developed (V
resistor (R
But the input offset current (I
offset voltage in the same manner - typically 0.05 mV at
room temp.
APPLICATION CIRCUITS
This section covers the following application circuits:
1. Telephone-Line Transceiver
2. “Simple” Mixer (Amplitude Modulator)
FIGURE 6. Canceling the Voltage Offset Effect of Input
FIGURE 5. Pulse Response per Figure 4
C
), as shown in Figure 6, cancels out this affect.
@
room) and R
B
) can develop a somewhat significant
Bias Current
OS
=I
F
B
OS
is 100 kΩ, then an offset of 9
x R
) will still contribute to an
F
).Using a compensation
F
. For example, if I
10012854
10012859
B
flowing
B

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