LMP8602MAEVAL/NOPB

User's Guide SNOA545C – April 2009 – Revised April 2013 AN-1958 LMP860x SOIC Evaluation Board 1 Introduction The LMP860x SOIC Evaluation Board, Figure 1, is designed to evaluate current sense amplifiers like the LMP8601, LMP8602, and LMP8603. These all are 60V Common Mode, Bidirectional Precision Current Sensing amplifier with different gain. This board has a LMP860X part mounted on the PCB together with the required de-coupling capacitor, power supply connections, Input and Output connectors and a 3 pin header for connecting the offset pin to either GND or VS. 2 General Description The LMP860x and LMP860xQ are fixed gain precision amplifiers. The part amplifies and filters small differential signals in the presence of high common mode voltages. The input common mode voltage range is −22V to +60V when operating from a single 5V supply. With 3.3V supply, the input common mode voltage range is from −4V to +27V. The LMP860x and LMP860xQ are members of the Linear Monolitic Precision ( LMP™) family and are ideal parts for unidirectional and bidirectional current sensing applications. The parts have a precise gain (LMP8601 20x, LMP8602 50x, LMP8603 100x) that is adequate in most targeted applications to drive an ADC to its full scale value. The fixed gain is achieved in two separate stages, a preamplifier with a gain of 10x and an output stage buffer amplifier with a gain of 2x, 5x, 10x. The connection between the two stages of the signal path is brought out on two pins to enable the possibility to create an additional filter network around the output buffer amplifier. These pins can also be used for alternative configurations with different gain as described in the applications information section of the data sheet (SNOSAR2 or SNOSB36). The mid-rail offset adjustment pin enables the user to use these devices for bidirectional single supply voltage current sensing. The output signal is bidirectional and mid-rail referenced when this pin is connected to the positive supply rail. With the offset pin connected to ground, the output signal is unidirectional and ground-referenced. The LMP860xQ incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies. Reliability qualification is compliant with the requirements and temperature grades defined in the AEC Q100 standard. 3 LMP860x Operating Conditions • • • • Temperature Range −40°C to 125°C Power Supply Voltage 3.0V ≤ VS ≤ 5.5V CMVR at VS = 3.3V −4V to 27V CMVR at VS = 5.0V −22V to 60V LMP is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. SNOA545C – April 2009 – Revised April 2013 Submit Documentation Feedback AN-1958 LMP860x SOIC Evaluation Board Copyright © 2009–2013, Texas Instruments Incorporated 1 Description of the LMP860x Evaluation Board www.ti.com 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