LMP7701MF/NOPB  

Manufacturer Part Number  LMP7701MF/NOPB 
Description  IC OP AMP PREC 12V RRIO SOT235 
Manufacturer  National Semiconductor 
Series  LMP® 
LMP7701MF/NOPB datasheet 

Specifications of LMP7701MF/NOPB  

Amplifier Type  General Purpose  Number Of Circuits  1 
Output Type  RailtoRail  Slew Rate  1.1 V/µs 
Gain Bandwidth Product  2.5MHz  Current  Input Bias  0.2pA 
Voltage  Input Offset  37µV  Current  Supply  790µA 
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  SOT235, SC74A, SOT25  Number Of Channels  1 
Voltage Gain Db  130 dB  Common Mode Rejection Ratio (min)  88 dB 
Input Voltage Range (max)  12 V  Input Voltage Range (min)  2.7 V 
Input Offset Voltage  0.2 mV at 5 V  Output Current (typ)  42 mA 
Operating Supply Voltage  3 V, 5 V, 9 V  Supply Current  1 mA at 5 V 
Maximum Operating Temperature  + 125 C  Mounting Style  SMD/SMT 
Minimum Operating Temperature   40 C  Lead Free Status / RoHS Status  Lead free / RoHS Compliant 
3db Bandwidth    Other names  LMP7701MF LMP7701MFTR 
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PRECISION CURRENT SOURCE
The LMP7701/LMP7702/LMP7704 can each be used as a
precision current source in many different applications. Figure
6 shows a typical precision current source. This circuit imple
ments a precision voltage controlled current source. Amplifier
A1 is a differential amplifier that uses the voltage drop across
R
as the feedback signal. Amplifier A2 is a buffer that elimi
S
nates the error current from the load side of the R
that would flow in the feedback resistor if it were connected
to the load side of the R
resistor. In general, the circuit is
S
stable as long as the closed loop bandwidth of amplifier A2 is
greater then the closed loop bandwidth of amplifier A1. Note
that if A1 and A2 are the same type of amplifiers, then the
feedback around A1 will reduce its bandwidth compared to
A2.
FIGURE 6. Precision Current Source
The equation for output current can be derived as follows:
Solving for the current I results in the following equation:
LOW INPUT VOLTAGE NOISE
The LMP7701/LMP7702/LMP7704 have the very low input
voltage noise of 9 nV/
. This input voltage noise can be
further reduced by placing N amplifiers in parallel as shown
in Figure 7. The total voltage noise on the output of this circuit
is divided by the square root of the number of amplifiers used
in this parallel combination. This is because each individual
amplifier acts as an independent noise source, and the aver
age noise of independent sources is the quadrature sum of
the independent sources divided by the number of sources.
For N identical amplifiers, this means:
resistor
S
Figure 7 shows a schematic of this input voltage noise reduc
tion circuit. Typical resistor values are:
= 10Ω, R
R
= 1 kΩ, and R
G
F
20127305
FIGURE 7. Noise Reduction Circuit
17
= 1 kΩ.
O
20127356
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