Datasheet

INA199A1-A3EVM Circuit

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3 INA199A1-A3EVM Circuit

This section summarizes the INA199A1-A3EVM components.

3.1 R1

R1 can be used for shunt resistors that have a package that may not be easily adaptable to a standard,

two-terminal, through-hole footprint or to a 0603 through 1206 surface-mount footprint. Specifically, this

component location was added to allow the use of TO-126, TO-220, TO-247, and four terminal inline

radial packages such as the CS3 series of shunts from Ohmite. The numbers located on the printed circuit

board (PCB) between R1 and J1 correspond to each of the holes in the R1 footprint. Holes with the same

number are connected together. The designation of 1 and 2 indicates that a particular hole is connected

directly to the V

IN+

and V

IN–

inputs, respectively. The designation of 3 and 4 indicates that a particular hole

is intended for the sense measurement of a four-wire shunt. Care must be taken to ensure that the shunt

is placed in the correct position in the R1 location. This placement consideration is evident when using a

two-connection shunt with a spacing of 200 mils (.200in or 5,080mm). As shown in Figure 4 and Figure 7,

the shunt must be placed in the second 1-designated hole in order for the other leg to fit into the 2

position. If the shunt is placed in the first 1 position, the second leg is left floating; no differential voltage

will be generated for the current monitor.

Additional packages can be tested by using the provided prototype area of the board.

Figure 4. TO-247 Package In R1 Figure 5. CS3 Package in R1

INA199A1-A3EVM SBOU085–May 2010