LMP8601MAEVAL/NOPB

User's Guide SNOA539A – February 2009 – Revised April 2013 AN-1940 LMP8601 Evaluation Board 1 Introduction The LMP8601 current sense evaluation board is designed to evaluate the LMP8601, 60 V common mode, bidirectional precision current sensing amplifier. This board has a LMP8601 part mounted on the printed circuit board (PCB) together with the required de-coupling capacitor, power supply connections, input and output (I/O) connectors and a 3-pin header for connecting the offset pin to either GND or VS. Figure 1. The LMP8601 Evaluation Board 2 General Description The LMP8601 and LMP8601Q are fixed 20x 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 −22 V to +60 V when operating from a single 5 V supply. With 3.3 V supply, the input common mode voltage range is from −4 V to +27 V. The LMP8601 and LMP8601Q are members of the Linear Monolitic Precision ( LMP™) family and are ideal parts for unidirectional and bidirectional current sensing applications. All parameter values of the parts that are shown in the tables of the LMP8601, LMP8601-Q1 60-V Common-Mode Bidirectional Precision Current Sensing Amplifier Data Sheet (SNOSAR2) are 100% tested and all bold values are also 100% tested over temperature. LMP is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. SNOA539A – February 2009 – Revised April 2013 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated AN-1940 LMP8601 Evaluation Board 1 LMP8601 Operating Conditions www.ti.com The part has a precise gain of 20x, which 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 pre-amplifier with a gain of 10x and an output stage buffer amplifier with a gain of 2x. 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 LMP8601, LMP8601-Q1 60-V Common-Mode Bidirectional Precision Current Sensing Amplifier Data Sheet (SNOSAR2). The mid-rail offset adjustment pin enables you 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 groundreferenced. The LMP8601Q 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 LMP8601 Operating Conditions • • • • 4 Temperature Range −40°C to 125°C Power Supply Voltage 3.0 V ≤ VS ≤ 5.5 V CMVR at VS = 3.3 V −4 V to 27 V CMVR at VS = 5.0 V −22 V to 60 V Description of the LMP8601 Evaluation Board The LMP8601 evaluation board requires a power supply with a voltage between 3.0 V and 5.5 V, the supply current will be