LMP7702MM/NOPB National Semiconductor, LMP7702MM/NOPB Datasheet - Page 16

IC AMP PREC R-R I/O DUAL 8-MSOP

LMP7702MM/NOPB

Manufacturer Part Number
LMP7702MM/NOPB
Description
IC AMP PREC R-R I/O DUAL 8-MSOP
Manufacturer
National Semiconductor
Series
LMP®r
Type
General Purpose Amplifierr
Datasheet

Specifications of LMP7702MM/NOPB

Amplifier Type
General Purpose
Number Of Circuits
2
Output Type
Rail-to-Rail
Slew Rate
1.1 V/µs
Gain Bandwidth Product
2.5MHz
Current - Input Bias
0.2pA
Voltage - Input Offset
37µV
Current - Supply
1.7mA
Current - Output / Channel
86mA
Voltage - Supply, Single/dual (±)
2.7 V ~ 12 V, ±1.35 V ~ 6 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
Rail/rail I/o Type
Rail to Rail Input/Output
Number Of Elements
2
Unity Gain Bandwidth Product
2.5MHz
Common Mode Rejection Ratio
86dB
Input Offset Voltage
220uV
Input Bias Current
1pA
Single Supply Voltage (typ)
3/5/9V
Dual Supply Voltage (typ)
Not RequiredV
Voltage Gain In Db
130dB
Power Supply Rejection Ratio
86dB
Power Supply Requirement
Single
Shut Down Feature
No
Single Supply Voltage (min)
2.7V
Single Supply Voltage (max)
12V
Dual Supply Voltage (min)
Not RequiredV
Dual Supply Voltage (max)
Not RequiredV
Technology
CMOS
Operating Temp Range
-40C to 125C
Operating Temperature Classification
Automotive
Mounting
Surface Mount
Pin Count
8
Package Type
MSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
-3db Bandwidth
-
Lead Free Status / Rohs Status
Compliant
Other names
LMP7702MM
LMP7702MMTR

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LMP7702MM/NOPB
Manufacturer:
NS/国半
Quantity:
20 000
www.national.com
This equation is rearranged to find the location of the two
poles:
As shown in Equation 1, as values of R
the magnitude of the poles is reduced, which in turn decreas-
es the bandwidth of the amplifier. Whenever possible, it is
best to choose smaller feedback resistors. Figure 3 shows the
effect of the feedback resistor on the bandwidth of the
LMP7701/LMP7702/LMP7704.
Equation 1 has two poles. In most cases, it is the presence of
pairs of poles that causes gain peaking. In order to eliminate
this effect, the poles should be placed in Butterworth position,
since poles in Butterworth position do not cause gain peaking.
To achieve a Butterworth pair, the quantity under the square
root in Equation 1 should be set to equal −1. Using this fact
and the relation between R
value for R
is chosen to be larger than this optimum value, gain peaking
will occur.
In Figure 2, C
and to increase stability. Additionally, C
FIGURE 3. Closed Loop Gain vs. Frequency
1
can be found. This is shown in Equation 2. If R
F
is added to compensate for input capacitance
1
and R
2
, R
2
1
= −A
and R
F
V
reduces or elimi-
R
2
1
are increased,
, the optimum
20127354
(1)
(2)
1
16
nates the gain peaking that can be caused by having a larger
feedback resistor. Figure 4 shows how C
ing.
DIODES BETWEEN THE INPUTS
The LMP7701/LMP7702/LMP7704 have a set of anti-parallel
diodes between the input pins, as shown in Figure 5. These
diodes are present to protect the input stage of the amplifier.
At the same time, they limit the amount of differential input
voltage that is allowed on the input pins. A differential signal
larger than one diode voltage drop might damage the diodes.
The differential signal between the inputs needs to be limited
to ±300 mV or the input current needs to be limited to ±10 mA.
FIGURE 4. Closed Loop Gain vs. Frequency with
FIGURE 5. Input of LMP7701
Compensation
F
reduces gain peak-
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