LMP2021MAEVAL National Semiconductor, LMP2021MAEVAL Datasheet
LMP2021MAEVAL
Manufacturer Part Number
LMP2021MAEVAL
Description
BOARD EVAL FOR LMP2021 OP AMP
Manufacturer
National Semiconductor
Series
LMP®r
Specifications of LMP2021MAEVAL
Channels Per Ic
1 - Single
Amplifier Type
Instrumentation
Output Type
Differential
Slew Rate
2.6 V/µs
Current - Output / Channel
50mA
Operating Temperature
-40°C ~ 125°C
Current - Supply (main Ic)
1.1mA
Voltage - Supply, Single/dual (±)
2.2 V ~ 5.5 V
Board Type
Fully Populated
Utilized Ic / Part
LMP2021
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
-3db Bandwidth
-
© 2008 National Semiconductor Corporation
LMP2021MAEVAL - Bridge
Sensor Instrumentation
Amplifier Evaluation Board
User Guide
The LMP2021MAEVAL Instrumentation Amplifier Evaluation
Board is configured as a differential-in, differential-out ampli-
fier using the LMP2021. Also included is a precision reference
and buffer to drive a bridge sensor. The board is set up to be
used with the ADC141S626 Evaluation Board (Part Number:
ADC141S626EB).
Power
J3 Connect to the positive supply.
J4 Connect to ground.
J5 If using dual supplies connect to the negative supply. If
J7 Pin 1 of J2 can be used to power the ADC141S626EB
using a single supply short J5 to ground.
Evaluation Board, which requires +5V. If J3 is +5V, JP3
can be shorted to provide +5V to the ADC141S626EB
Evaluation Board. If J3 is not +5V, leave JP3 open and
connect +5V to J7.
300883
National Semiconductor
Application Note 1932
Mike Stout
December 10, 2008
Input Signal and Bridge Excitation
J1 is used to power the bridge sensor and input the signal
from the bridge to the amplifier. The LM4120 (U4) provides a
precision +5V reference. This is buffered by the LMP7741
(U5) and supplied on pin 1 of J1 to power the bridge sensor.
The bottom of the bridge sensor can be connected to pin 2
which is connected to ground. The outputs of the bridge sen-
sor can be connected to pins 3 and 5 of J1.
Output Signal
The output of the amplifier is available on pins 3 and 5 of J2.
This connector is pin-to-pin compatible with the input con-
nector of the ADC141S626EB Evaluation Board.
Amplifier Gain
The gain of the amplifier is set using R1, R10, R11, and R12.
If R11 = R12, the gain of the amplifier is 1 + (2R11)/(R1||R10).
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LMP2021MAEVAL Summary of contents
Page 1
... LMP2021MAEVAL - Bridge Sensor Instrumentation Amplifier Evaluation Board User Guide The LMP2021MAEVAL Instrumentation Amplifier Evaluation Board is configured as a differential-in, differential-out ampli- fier using the LMP2021. Also included is a precision reference and buffer to drive a bridge sensor. The board is set used with the ADC141S626 Evaluation Board (Part Number: ADC141S626EB) ...
Page 2
www.national.com 2 ...
Page 3
FIGURE 2. PCB Top FIGURE 3. PCB Bottom 3 30088301 30088303 www.national.com ...
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... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock and Timing www.national.com/timing Data Converters www.national.com/adc Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www.national.com/ldo LED Lighting www ...