MAX9617 Evaluation Kit Evaluates: MAX9617 General Description The MAX9617 evaluation kit (EV kit) provides a proven design to evaluate the MAX9617 low-power, zero-drift operational amplifier (op amp) in a 6-pin SC70 package. The EV kit circuit is preconfigured as a noninverting amplifier, but can easily be adapted to other topologies by changing a few components. Low power, zero drift, input offset voltage, and rail-to-rail input/output stages make this device ideal for a variety of low-frequency measurement applications. The component pads accommodate 0805 packages, making them easy to solder and replace. The MAX9617 EV kit comes with a MAX9617AXT+ installed. Features S Accommodates Multiple Op-Amp Configurations S Component Pads Allow for Sallen-Key Filter S Rail-to-Rail Inputs/Outputs S Accomodates Easy-to-Use 0805 Components S Proven PCB Layout S Fully Assembled and Tested Ordering Information PART TYPE MAX9617EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION QTY DESCRIPTION C1, C3 2 0.1FF Q10%, 25V X7R ceramic capacitors (0805) Murata GRM21BR71E104K C2, C4 2 4.7FF Q10%, 25V X5R ceramic capacitors (0805) Murata GRM21BR61E475K C5-C10 0 Not installed, ceramic capacitors (0805) R1, R2 2 1kI Q1% resistors (0805) R3, R4, R7 0 Not installed, resistors (0805) R5 1 10kI Q1% resistor (0805) R6, R8 2 0I Q5% resistors (0805) JU1, JU2, JU4 3 2-pin headers DESIGNATION QTY JU3, JU5 2 3-pin headers DESCRIPTION TP1, TP3, TP5, TP6, TP7 5 Red multipurpose test points TP2, TP4 2 Black multipurpose test points TP8 0 Not installed, miniature test point U1 1 Single low-power, rail-to-rail I/O op amp (6 SC70) Maxim MAX9617AXT+ -- 5 Shunts -- 1 PCB: MAX9617 EVALUATION KIT+ Component Supplier SUPPLIER Murata Electronics North America, Inc. PHONE 770-436-1300 WEBSITE www.murata-northamerica.com Note: Indicate that you are using the MAX9617 when contacting this component supplier. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maximintegrated.com. 19-4938; Rev 0; 9/09 MAX9617 Evaluation Kit Evaluates: MAX9617 Quick Start Required Equipment * * * * MAX9617 EV kit +5V, 10mA DC power supply (PS1) Precision voltage source Digital multimeter (DMM) Procedure The MAX9617 EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) Verify that the jumpers are in their default position, as shown in Table 1. 2) Connect the positive terminal of the +5V supply to VDD (TP1) and the negative terminal to GND (TP2) and VSS (TP3). 3) Connect the positive terminal of the precision voltage source to INP (TP6). Connect the negative terminal of the precision voltage source to GND (TP2 or TP4). 4) Connect INM (TP5) to GND. 5) Connect the DMM to monitor the voltage on OUTA (TP7). With the 10kI feedback resistor (R5) and 1kI series resistor (R1), the gain is +11 (noninverting configuration). 6) Turn on the +5V power supply. 7) Apply 100mV from the precision voltage source. Observe the output at OUTA (TP7) on the DMM. OUTA should read approximately +1.1V. 8) Apply 400mV from the precision voltage source. OUTA should read approximately +4.4V. Table 1. MAX9617 EV Kit Jumper Descriptions (JU1-JU5) JUMPER SHUNT POSITION 1-2* JU1 Open 1-2* JU2 JU3 JU4 JU5 Open DESCRIPTION Connects IN- to R1. Also shorts capacitor C5. Connects IN- to R1 through capacitor C5. When AC-coupling is desired, remove the shunt and install capacitor C5. Connects IN+ to JU3 position 1. Also shorts capacitor C6. Connects IN+ to JU3 position 1 through capacitor C6. When AC-coupling is desired, remove the shunt and install capacitor C6. 1-2* Connects IN+ to INP (TP6) through R2 and R8 2-3 Connects IN+ to GND through R2 and R8 1-2* Connects OUT to OUTA (TP7) Open Connects OUT to OUTA (TP7) through capacitor C10. When AC-coupling is desired, remove the shunt and install capacitor C10. 1-2* Always keep jumper in this position (normal operation) 2-3 Do not use this jumper position *Default position. Detailed Description of Hardware The MAX9617 EV kit provides a proven layout for the MAX9617 low-power, zero-drift operational amplifier (op amp). The MAX9617 is a single-supply op amp that is ideal for buffering low-frequency sensor signals. The Sallen-Key topology is easily accomplished by changing and removing a few components. The Sallen-Key topology is ideal for buffering and filtering sensor signals. Various test points are included for easy evaluation. however, the MAX9617 can operate with a dual supply as long as the voltage across the VDD and GND pins of the IC do not exceed the Absolute Maximum Ratings. When operating with a single supply, short VSS to GND. Op-Amp Configurations The MAX9617 is a single-supply op amp that is ideal for differential sensing, noninverting amplification, buffering, and filtering. A few common configurations are shown in the next few sections. The MAX9617 is a single-supply op amp whose primary application is operating in the noninverting configuration; 2 Maxim Integrated MAX9617 Evaluation Kit Evaluates: MAX9617 Noninverting Configuration The MAX9617 EV kit comes preconfigured as a noninverting amplifier. The gain is set by the ratio of R5 and R1. The MAX9617 EV kit comes preconfigured for a gain of 11. The output voltage for the noninverting configuration is given by the equation below: VOUT= (1 + R5 ) VINP R1 Differential Amplifier To configure the MAX9617 EV kit as a differential amplifier, replace R1, R2, R3, and R5 with appropriate resistors. When R1 = R2 and R3 = R5, the CMRR of the differential amplifier is determined by the matching of the resistor ratios R1/R2 and R3/R5. = VOUT GAIN (VINP - VINM ) where: GAIN = R5 R3 = R1 R2 Sallen-Key Configuration The Sallen-Key topology is ideal for filtering sensor signals with a second-order filter and acting as a buffer. Schematic complexity is reduced by combining the filter and buffer operations. The MAX9617 EV kit can be configured in a Sallen-Key topology by replacing and populating a few components. The Sallen-Key topology can be configured as a unity-gain buffer by replacing R1 and R5 with 0I resistors. The signal is noninverting and applied to INP. The filter component pads are R2, Maxim Integrated R3, R4, and R8, where some have to be populated with resistors and others with capacitors. Lowpass Sallen-Key Filter: To configure the Sallen-Key as a lowpass filter, populate the R2 and R8 pads with resistors and populate the R3 and R4 pads with capacitors. The corner frequency and Q are then given by: fc = 1 2 R R2 R R8 C R3 C R4 Q= R R2 R R8 C R3 C R4 C R4 (R R2 + R R8 ) Highpass Sallen-Key Filter: To configure the SallenKey as a highpass filter, populate the R3 and R4 pads with resistors and populate the R2 and R8 pads with capacitors. The corner frequency and Q are then given by: fc = 1 2 R R3 R R4 C R2 C R8 Q= R R3 R R4 C R2 C R8 R R3 (C R2 + C R8 ) Capacitive Loads Some applications require driving large capacitive loads. To improve the stability of the amplifier in such cases, replace R6 with a suitable resistor value to improve amplifier phase margin. 3 MAX9617 Evaluation Kit Evaluates: MAX9617 Figure 1. MAX9617 EV Kit Schematic 4 Maxim Integrated MAX9617 Evaluation Kit Evaluates: MAX9617 1.0'' Figure 2. MAX9617 EV Kit Component Placement Guide-- Component Side 1.0'' Figure 3. MAX9617 EV Kit PCB Layout--Component Side Figure 4. MAX9617 EV Kit PCB Layout--Solder Side Maxim Integrated 5 MAX9617 Evaluation Kit Evaluates: MAX9617 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 6 (c) Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 2009 Maxim Integrated Products, Inc. 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