19-5904 Rev 0 6/11 MAX44260 Evaluation Kit Evaluates: MAX44260 General Description Features The MAX44260 evaluation kit (EV kit) provides a S Accommodates Multiple Op-Amp Configurations proven design to evaluate the MAX44260 low-power, S Component Pads Allow for Sallen-Key Filter low-input-offset voltage, high-bandwidth operational S Rail-to-Rail Inputs/Output amplifier (op amp) in a 6-pin SC70 package. The EV kit S Proven PCB Layout circuit is preconfigured as a noninverting amplifier, but can easily be adapted to other topologies by changing S Fully Assembled and Tested few components. Low power, low-input-offset voltage, and rail-to-rail input/output stages make the device ideal for a variety of precision measurement applications. The Ordering Information appears at end of data sheet. EV kit comes with a MAX44260AXT+ installed. Component List DESIGNATION QTY DESCRIPTION DESIGNATION QTY DESCRIPTION JU2 1 3-pin header 0.1FF Q10%, 16V X7R ceramic C1, C3 2 R1, R2 2 1kI Q1% resistors (0603) capacitors (0603) Murata GCM188R71C104K R3, R4, R7, R9, 0 Not installed, resistors (0603) R10 4.7FF Q10%, 25V X5R ceramic C2, C4 2 capacitors (0805) R5 1 10kI Q1% resistor (0603) Murata GRM21BR61E475K R6, R8 2 0I Q5% resistors (0603) TP8 0 Not installed, miniature test point Not installed, ceramic capacitors (0603) Low-power, rail-to-rail op amp C5C10 0 C5, C6, C10 are short (PC U1 1 (6 SC70) trace) C7, C8, C9 are open Maxim MAX44260AXT+ 2 Shunts INMB, INPB, 50I PCB vertical-mount BNC 3 OUTAB connectors PCB: MAX44260 EVALUATION 1 KIT INM, INP, OUTA 3 Red multipurpose test points JU1 1 2-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 MAX44260 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.MAX44260 Evaluation Kit Evaluates: MAX44260 Quick Start Detailed Description of Hardware The MAX44260 EV kit provides a proven layout for the Required Equipment MAX44260 low-power, low-input-voltage offset op amp. MAX44260 EV kit The device can be operated as a single-supply or +5V, 10mA DC power supply (PS1) dual-supply op amp that is ideal for buffering precision Precision voltage source sensor signals. The circuits Sallen-Key filter is easily Digital voltmeter (DVM) evaluated by changing and removing some components. The Sallen-Key filter is ideal for buffering and filtering Procedure sensor signals. BNC connectors are installed to test The EV kit is fully assembled and tested. Follow the steps at high frequency, but not required for DC and low- below to verify board operation: frequency testing. Various test points are included for 1) Verify that shunts are installed in the default positions easy evaluation. on jumpers JU1 and JU2, as shown in Table 1. The device is a single-supply op amp whose primary 2) Jumper JU1 shorts VEE to GND for single-supply application is operating in the noninverting configura- operation. The 1-2 position of JU2 enables the device. tion however, the device can operate with dual supply 3) Connect the positive terminal of the +5V supply to the as long as the voltage across the devices VCC and VCC PCB pad. Connect the negative terminal of the VEE pins do not exceed the Absolute Maximum Ratings. power supply to the GND PCB pad nearest VCC. When operating with a single supply, short VEE to GND by installing a shunt on jumper JU1. 4) Connect the positive terminal of the precision voltage source to the INP test point. Connect negative terminal Op-Amp Configurations of the precision voltage source to the GND PCB pad. The device is a single-supply op amp that is ideal for 5) Connect the INM test point to the GND PCB pad. differential sensing, noninverting amplification, buffering, and filtering. The following configurations are shown in 6) Connect the positive terminal of the DVM to the OUTA the next few sections: noninverting, differential, lowpass test point to monitor the output voltage. Connect the Sallen-Key filter, and highpass Sallen-Key filter. negative terminal of the DVM to the GND PCB pad. With the default 10kI feedback resistor (R5) and 1kI Noninverting Configuration series input resistor (R1) of the op amp, the gain is The EV kit comes preconfigured as a noninverting ampli- +11V/V (noninverting configuration). fier. The gain is set by the ratio of resistors R5 and R1. 7) Turn on the +5V power supply. The EV kit comes preconfigured for a gain of +11V/V. The output voltage for the noninverting configuration is given 8) Apply 100mV from the precision voltage source. by the equation below: Observe the output at OUTA on the DVM. OUTA should read approximately +1.1V. R5 9) Apply 400mV from the precision voltage source. V = 1+ V + V ( ) OUT INP OS R1 OUTA should read approximately +4.4V. where V = Input-referred offset voltage OS Table 1. Jumper Descriptions (JU1, JU2) Differential Amplifier To configure the EV kit as a differential amplifier, replace SHUNT JUMPER DESCRIPTION R1, R2, R3, and R5 with appropriate resistors. When POSITION resistors R1 = R2 and R3 = R5, the CMRR of the differen- Connects VEE to GND for Installed* tial amplifier is determined by the matching of the resistor single-supply operation. ratios R1/R2 and R3/R5. JU1 VEE and GND are Not installed independently supplied for R5 dual-supply operation. V = GAIN V V + 1 + V ( ) OUT INP INM OS R1 Connects the SHDN pin to VCC 1-2* to enable the device (normal where: operation). JU2 R5 R3 GAIN= = Connects the SHDN pin to VEE 2-3 R1 R2 to disable the device (shutdown). *Default position. Maxim Integrated Products 2