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Description of the LMP860x Evaluation Board

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Figure 1. LMP860x Evaluation Board

4 Description of the LMP860x Evaluation Board

The LMP860x evaluation board requires a power supply with a voltage between 3.0V and 5.5V , the

supply current will be <2 mA in normal operation with high impedance load on the output of the part. The

positive supply voltage is connected to V

(CON3) The negative supply voltage is connected to GND

(CON4).

The offset voltage on the output of the LMP860x is determined by the voltage on the offset pin which is

connected to pin2 of P3 and the offset voltage will be V

Offset

/2. This pin is normally connected with a

jumper to GND or V

, but this pin can also be driven from a low impedance source (<10 Ω).

With a jumper on P3 between 2-3 the offset pin is connected to V

and the offset voltage is half the value

of V

. In this configuration the LMP860x can be used for measuring bidirectional currents.

With a jumper on P3 between 1-2 the offset pin is connected to GND and the output voltage is ground

referenced. In this configuration the LMP860x is used for measuring unidirectional currents.

The input signal is connected between -IN and +IN (P1 pin 2,3) and the output signal is available at OUT

(P2).

On the board there is the possibility to place a capacitor C1 which creates a low pass filter between the

first and second stage. This can be used to reduce the output noise and glitches that might appear from

switching large common mode voltages with very fast transients at the input. (For more details about this

filter, see the application information section of the LMP860x data sheet (SNOSAR2 or SNOSB36)).

AN-1958 LMP860x SOIC Evaluation Board SNOA545C–April 2009–Revised April 2013

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