Datasheet

10 LMP90100 EVB User’s Guide August 2012
4.0. Example #2: Shorted Input and Calibration Test
This example demonstrates LMP90100’s ability to calibrate for offset error.
A. LMP90100 EB Jumper Connections
1. Connect the LMP90100EB jumpers like the jumpers shown in the figure and table below.
Jumpers not mentioned can be left unconnected.
2. The SPIO-4 board is properly setup out of the box (no assembly required).
3. The schematic for the LMP90100EB can be seen in section 10.
Figure 8 – LMP90100EB Jumper Settings for the Shorted input and Calibration Test
Jumpers
Pin
Purpose
JP1: VA_EXT
P2-P3
Source VA with the 5.0V from the SPIO-4 board.
JP2: VIO_EXT
P2-P3
Source VIO with the 5.0V from the SPIO-4 board.
JP4
P2-P3
Get 5.0V from the SPIO-4 board
JP6
P1-P2
Connect VA supply to the LMP90100
JP7
P1-P2
Connect VIO supply to the LMP90100
JP9
P1-P2
Force the odd pins of JP10 to be midscale (VREF1/2)
JP10: VIN_JMP
P5-P6
Connect a DC (midscale) voltage to VIN2
JP13: VREF_JMP1
P3-P4
VREFP1 = 4.1V from U4 (LM4140)
JP13: VREF_JMP1
P9-P10
VREFN1 = ground