Evaluates: MAX9911 19-5734 Rev 0 1/11 MAX9911 Evaluation Kit General Description Features The MAX9911 evaluation kit (EV kit) provides a proven S 1.8V to 5.5V Supply Voltage Range design to evaluate the MAX9911 low-power, MOS-input S Accommodates Multiple Op-Amp Configurations operational amplifier (op amp) in a 6-pin wafer-level S Component Pads Allow for Sallen-Key Filter package (WLP). The EV kit circuit is preconfigured as S Rail-to-Rail Inputs/Outputs a noninverting amplifier, but can easily be adapted to other topologies by changing a few components. Low S Accommodates Easy-to-Use 0805 Components power, low-input V , and rail-to-rail input/output stages OS S Proven PCB Layout make this device ideal for a variety of measurement S Fully Assembled and Tested applications. The component pads accommodate 0805 packages, making them easy to solder and replace. The EV kit comes with a MAX9911EWT+ installed. Ordering Information PART TYPE MAX9911EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION R1, R2 2 1kI Q1% resistors (0805) 0.1FF Q10%, 16V X7R ceramic C1 1 capacitor (0603) R5 1 10kI Q1% resistor (0805) Murata GRM188R71C104K R6, R8 2 0I Q5% resistors (0805) 4.7FF Q10%, 6.3V X5R ceramic Single low-power, rail-to-rail I/O C2 1 capacitor (0603) U1 1 op amp (6 WLP) Murata GRM188R60J475K Maxim MAX9911EWT+ 2 Shunts Not installed, ceramic capacitors C3, C4, C8, C9 0 (0805) PCB: MAX9911 EVALUATION 1 KIT+ JU1 1 2-pin header JU2 1 3-pin header Component Supplier SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com Note: Indicate that you are using the MAX9911 when contacting this component supplier. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.MAX9911 Evaluation Kit Quick Start Detailed Description of Hardware The MAX9911 EV kit provides a proven layout for the Required Equipment MAX9911 low-power, MOS-input op amp. The device is MAX9911 EV kit a single-supply op amp that is ideal for buffering sensor +5V, 10mA DC power supply (PS1) signals. The Sallen-Key topology is easily accomplished Precision voltage source by changing and removing some components. The Sallen-Key topology is ideal for buffering and filtering Digital multimeter (DMM) sensor signals. Procedure Op-Amp Configurations The EV kit is fully assembled and tested. Follow the steps The device is a single-supply op amp that is ideal for below to verify board operation: differential sensing, noninverting amplification, buffering, 1) Verify that jumpers are in their default positions, as and filtering. A few common configurations are detailed shown in Table 1. in the next few sections. 2) Connect the positive terminal of the +5V supply to Noninverting Configuration the VDD PCB pad and the negative terminal to the The EV kit comes preconfigured as a noninverting GND PCB pad closest to VDD. amplifier. The gain is set by the ratio of R5/R1. The EV 3) Connect the positive terminal of the precision volt- kit comes preconfigured for a gain of +11. For a volt- age source to the IN+ PCB pad. Connect the nega- age applied to the IN+ PCB pad, the output voltage for tive terminal of the precision voltage source to GND the noninverting configuration is given by the equation (GND or IN- PCB pads). below: 4) Connect the DMM to monitor the voltage on the OUT PCB pad. With the 10kI feedback resistor (R5) and R5 V = (1 + )(V V ) OUT IN+ OS 1kI series resistor (R1), the gain is +11 (noninvert- R1 ing configuration). 5) Turn on the +5V power supply. where V = input-referred offset voltage. OS 6) Apply 100mV from the precision voltage source. Differential Amplifier Observe the output at OUT on the DMM. OUT To configure the EV kit as a differential amplifier, replace should read approximately +1.1V. R1, R2, R , and R5 with appropriate resistors. When R1 C3 = R2 and R = R5, the CMRR of the differential amplifier C3 7) Apply 400mV from the precision voltage source. is determined by the matching of the resistor ratios R1/ OUT should read approximately +4.4V. R2 and R /R5: C3 Table 1. Jumper Descriptions (JU1, JU2) R5 V = Gain(V V ) + (1 + )V OUT IN+ IN OS R1 SHUNT JUMPER DESCRIPTION POSITION where: Connects the IN- PCB pad to Installed* GND. R5 R C3 JU1 Gain = = Isolates the IN- PCB pad from R1 R2 Open GND. Connects SHDN to VDD 1-2* (normal operation). JU2 Connects SHDN to GND 2-3 (shutdown). *Default position. 2 Evaluates: MAX9911