MAX44248 Evaluation Kit Evaluates: MAX44248 General Description Features The MAX44248 evaluation kit (EV kit) provides a proven S Accommodates Multiple Op-Amp Configurations design to evaluate the MAX44248 low-power, dual op S Component Pads Allow for Sallen-Key Filter M amps in an 8-pin FMAX package. The EV kit circuit S Accommodates Easy-to-Use 0805 Components is preconfigured as noninverting amplifiers, but can be adapted to other topologies by changing a few com- S Proven PCB Layout ponents. The component pads use a 0805 package, S Fully Assembled and Tested making them easy to solder and replace. The EV kit Ordering Information appears at end of data sheet. comes with a MAX44248AUA+ installed. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION JU1JU5 5 2-pin headers 0.1FF Q10%, 50V X7R ceramic C1, C10 2 capacitors (0805) R1, R2, R11, R12 4 1kI Q1% resistors (0805) Murata GRM21BR71H104K R3, R4, R7, R13, 0 Not installed, resistors (0805) R14, R17 4.7FF Q10%, 50V X7R ceramic R5, R15 2 C2, C20 2 capacitors (1210) 10kI Q1% resistors (0805) Murata GRM32ER71H475K R6, R8, R16, R18 4 0I Q5% resistors (0805) Not installed, miniature test Not installed, ceramic TP1, TP2 0 points capacitors (0805) C3C9, C13C19 0 C3, C4, C9, C13, C14, C19 are 36V, ultra-precision, low-power, short (PC trace) U1 1 dual op amps (8 FMAX) C5C8, C15C18 are open Maxim MAX44248AUA+ GND 6 Black test points VDD, VSS 2 Red test points 5 Shunts INAN, INAP, INBN, INBP, 6 White test points PCB: MAX44248 EVALUATION 1 OUTA, OUTB KIT Component Supplier SUPPLIER PHONE WEBSITE Murata Electronics North America Inc. 770-436-1300 www.murata-northamerica.com Note: Indicate that you are using the MAX44248 when contacting this component supplier. MAX is a registered trademark of Maxim Integrated Products, Inc. 19-6361 Rev 0 8/12 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com.MAX44248 Evaluation Kit Evaluates: MAX44248 ever, the IC can operate with a dual supply as long as the Quick Start voltage across the VDD and VSS pins on the IC does not exceed the absolute maximum ratings. When operating Required Equipment with a single supply, short VSS to GND using jumper JU5. MAX44248 EV kit Op-Amp Configurations +5V, 10mA DC power supply (PS1) The IC is a single-/dual-supply dual op amp that is ideal Two precision voltage sources for differential sensing, noninverting amplification, buff- Two digital multimeters (DMMs) ering, and filtering. A few common configurations are shown in the next few sections. Procedure The EV kit is fully assembled and tested. Follow the steps The following sections explain how to configure one of the below to verify board operation: devices op amps (op amp A). To configure the devices second op amp (op amp B), the same equations can be 1) Verify that all jumpers (JU1JU5) are in their default used after modifying the component reference designa- positions, as shown in Table 1. tors. For op amp B, the equations should be modified by 2) Connect the positive terminal of the +5V supply to adding 10 to the number portion of the reference desig- VDD and the negative terminal to GND. nators (e.g., for the noninverting configuration, equation 3) Connect the positive terminal of the precision voltage R1 becomes R11 and R5 becomes R15). source to INAP. Connect the negative terminal of the Noninverting Configuration precision voltage source to GND. INAN is already The EV kit comes preconfigured as a noninverting ampli- connected to GND through jumper JU1. fier. The gain is set by the ratio of R5 and R1. The EV kit 4) Connect the positive terminal of the second precision comes preconfigured for a gain of 11. The output voltage voltage source to INBP. Connect the negative termi- for the noninverting configuration is given in the following nal of the precision voltage source to GND. INBN is equation: already connected to GND through jumper JU3 R5 5) Connect the DMMs to monitor the voltages on OUTA V =1++VV OUTA INAP OS R1 and OUTB. With the 10kI feedback resistors and 1kI series resistors, the gain of each noninverting amplifier is +11. 6) Turn on the +5V power supply. Table 1. Jumper Descriptions (JU1JU5) 7) Apply 100mV from the precision voltage sources. Observe the output at OUTA and OUTB on the SHUNT JUMPER DESCRIPTION DMMs. Both should read approximately +1.1V. POSITION 8) Apply 400mV from the precision voltage sources. Both Pin 1 Disconnects INAN from GND. OUTA and OUTB should read approximately +4.4V. JU1 Connects INA- to GND through R1 1-2* Note: For dual-supply operation, Q2.7V to Q18V can for noninverting configuration. be applied to VDD and VSS, respectively. In this case, Pin 1* Disconnects INAP from GND. remove the shunt on jumper JU5. The rest of the pro- JU2 Connects INA+ to GND 1-2 cedure remains the same as that of the single-supply through R2. operation. Pin 1 Disconnects INBN from GND. JU3 Connects INB- to GND through Detailed Description of Hardware 1-2* R11 for noninverting configuration. The MAX44248 EV kit provides a proven layout for the Pin 1* Disconnects INBP from GND. MAX44248 low-power, dual op amps. The IC is a single-/ JU4 Connects INB+ to GND dual-supply dual op amp (op amp A and op amp B) that 1-2 through R12. is ideal for buffering low-frequency sensor signals. The Disconnects VSS from GND for Sallen-Key topology is easily accomplished by changing Pin 1 dual-supply operation. and removing a few components. The Sallen-Key topol- JU5 ogy is ideal for buffering and filtering sensor signals. Connects VSS to GND for 1-2* single-supply operation. Various test points are included for easy evaluation. The default configuration for the IC in the EV kit is single- *Default position. supply operation in a noninverting configuration how- 2