5 Input and Output Connections

The instrumentation amplifier input signal connections for the INA851EVM are provided through the use of SMA connectors J3, J6, and test points TP5, TP7, located at the left of the EVM. The VOCM input is provided through screw-terminal connector J10, located on the left of the board.

By default, the output clamp voltage levels, VCLAMP+ and VCLAMP–, are set to the INA851 positive (+VCC) and negative (–VEE) supplies, respectively. The VCLAMP+ pin is connected to +VCC through jumper J11 1-2, and the VCLAMP– pin is connected to –VEE through J12 1-2. Screw terminal connector J9 provides access to the output clamp pins. To set the voltage level of the clamps with an external supply, shunt jumper J11 2-3 to access the VCLAMP+ using connector J9.1. In a similar fashion, shunt jumper J12 2-3 to access the VCLAMP– pin using connector J9.3.

The differential output amplifier connections are provided through screw-terminal connector J5, SMA connectors J2 and J8, and test points TP6 and TP8, located at the right side of the EVM. A simplified diagram of the INA851EVM input and output connections is displayed in Figure 5-1.

Table 5-1 summarizes the input and output connectors and corresponding test points.