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PDF LMP8100 Data sheet ( Hoja de datos )
| Número de pieza | LMP8100 | |
| Descripción | Programmable Gain Amplifier | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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551013037 - LMP8100
Evaluation Board User
Guide
National Semiconductor
Application Note 1626
Mike Stout
July 2007
This evaluation board contains the LMP8100, along with a
logic circuit to program the register in the LMP8100.
Connectors, Jumpers, Test Points
POWER SUPPLY
There are three banana plugs labeled GND, V+, and V− to
power the eval board. A single supply of +5V or a dual supply
of ±2.5V can be used.
SIGNAL CONNECTORS
There are three connectors for signals.
J1 is a BNC labeled VIN for the input signal.
J2 is a BNC labeled VOUT for the output signal
J3 is a 5-pin header that can be connected to a
microcontroller. A microcontroller can be used to write
the register of the LMP8100 if the logic circuitry on the
eval board is not used. See the Writing to the Register
Using a Microcontroller section.
JUMPERS
The eval board has six jumpers.
JP1 connects the SCK pin of the LMP8100 to either the on-
board logic or to J3.
JP2 connects the SDI pin of the LMP8100 to either the on-
board logic or to J3.
JP3 connects the CS pin of the LMP8100 to either the on-
board logic or to J3.
JP4 connects the V− pin of the LMP8100 to either the V−
banana plug or to ground.
JP5 connects the GRT pin of the LMP8100 to ground, a
low-impedance DC source, or an AC ground. See the
Low-Impedance DC Source section.
JP6 connects the enable pin of the op amp used in the low-
impedance DC source to either +5V (enabled) or
ground (disabled).
TEST POINTS
The test points are connected as follows.
TP1 – +IN pin
TP2 – GRT pin
TP3 – SDO pin
TP4 – VOUT pin
TP5 – SCK pin
TP6 – SDI pin
TP7 – CS pin
Hardware Setup
REGISTER PROGRAMMING SETUP
1. To use the on-board logic circuit to program the
LMP8100 Register connect the jumpers as follows:
JP1 – Pins 2 and 3
JP2 – Pins 2 and 3
JP3 – Pins 2 and 3
2. To use an external microcontroller to program the
LMP8100 Register connect the jumpers as follows:
JP1 – Pins 1 and 2
JP2 – Pins 1 and 2
JP3 – Pins 1 and 2
Connect the external microcontroller to J3.
POWER SUPPLY SETUP
1. +5V Supply
Connect the jumper as follows:
JP4 – GND and the center pin
Connect a +5V supply to the V+ and GND banana plugs.
2. ±2.5V Supply
Connect the jumper as follows:
JP4 – V− and the center pin
Connect a +2.5V supply to the V+ banana plug, a −2.5V
supply to the V− banana plug, and supply grounds to the
GND banana plug.
GRT PIN SETUP
1. To connect the GRT pin to ground
Connect the jumpers as follows:
JP5 – GND and the center pin
JP6 – GND and the center pin
2. To connect the GRT pin to a Low-Impedance Source
Connect the jumpers as follows:
JP5 – DC and the center pin
JP6 – V+ and the center pin
3. To connect the GRT pin to an AC ground
Connect the jumpers as follows:
JP5 – AC GND and the center pin
JP6 – GND and the center pin
COMPONENTS
Various loads can be installed on the eval board. The series
resistance at R8 can be changed or replaced by a jumper.
The resistive load at R4 can be changed. An AC coupled load
can be added by using C24 and R9. A capacitive load can be
added at C4. The eval board with a jumper at R8 has between
6 and 7 pF of parasitic capacitance.
© 2007 National Semiconductor Corporation 300188
www.national.com
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| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LMP8100.PDF ] | |
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