LMP7716MMX/NOPB National Semiconductor, LMP7716MMX/NOPB Datasheet - Page 15

IC AMP PREC 17MHZ DUAL 8-MSOP

LMP7716MMX/NOPB

Manufacturer Part Number
LMP7716MMX/NOPB
Description
IC AMP PREC 17MHZ DUAL 8-MSOP
Manufacturer
National Semiconductor
Series
LMP®, PowerWise®r
Datasheet

Specifications of LMP7716MMX/NOPB

Amplifier Type
General Purpose
Number Of Circuits
2
Output Type
Rail-to-Rail
Slew Rate
11.5 V/µs
Gain Bandwidth Product
17MHz
Current - Input Bias
0.1pA
Voltage - Input Offset
10µV
Current - Supply
1.3mA
Current - Output / Channel
66mA
Voltage - Supply, Single/dual (±)
1.8 V ~ 5.5 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
-
Other names
LMP7716MMX

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LMP7716MMX/NOPB
Manufacturer:
TI
Quantity:
1 560
For the time being, ignore C
Figure 3
This equation is rearranged to find the location of the two
poles:
As shown in
creased, the magnitude of the poles are reduced, which in
turn decreases the bandwidth of the amplifier.
the frequency response with different value resistors for R
and R
back resistors.
As mentioned before, adding a capacitor to the feedback path
will decrease the peaking. This is because C
another pole in the system and will prevent pairs of poles, or
complex conjugates from forming. It is the presence of pairs
of poles that cause the peaking of gain.
frequency response of the schematic presented in
with different values of C
ue capacitor significantly reduces or eliminates the peaking.
FIGURE 4. Closed Loop Frequency Response
2
. Whenever possible, it is best to chose smaller feed-
can be calculated as follows:
Equation
2, as the values of R
F
. As can be seen, using a small val-
F
. The AC gain of the circuit in
Figure 5
1
Figure 4
and R
F
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will form yet
shows the
Figure 3
2
are in-
shows
(1)
(2)
1
15
TRANSIMPEDANCE AMPLIFIER
In many applications the signal of interest is a very small
amount of current that needs to be detected. Current that is
transmitted through a photodiode is a good example. Barcode
scanners, light meters, fiber optic receivers, and industrial
sensors are some typical applications utilizing photodiodes
for current detection. This current needs to be amplified be-
fore it can be further processed. This amplification is per-
formed using a current-to-voltage converter configuration or
transimpedance amplifier. The signal of interest is fed to the
inverting input of an op amp with a feedback resistor in the
current path. The voltage at the output of this amplifier will be
equal to the negative of the input current times the value of
the feedback resistor.
plifier configuration. C
capacitance and C
tance of the amplifier. The presence of all of these capaci-
tances at higher frequencies might lead to less stable
topologies at higher frequencies. Care must be taken when
designing a transimpedance amplifier to prevent the circuit
from oscillating.
With a wide gain bandwidth product, low input bias current
and low input voltage and current noise, the LMP7715/
LMP7716/LMP7716Q are ideal for wideband transimpedance
applications.
FIGURE 5. Closed Loop Frequency Response
FIGURE 6. Transimpedance Amplifier
CM
Figure 6
D
denotes the common-mode capaci-
represents the photodiode parasitic
shows a transimpedance am-
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