MAX9632 Evaluation Kit Evaluates: MAX9632 General Description The MAX9632 evaluation kit (EV kit) provides a proven design to evaluate the MAX9632 low-noise, precision and wide-band op amp. The MAX9632 can be used in a wide variety of applications such as test and measurement, instrumentation, medical imaging, control loops, and professional audio. Because of the ultra-low noise and great precision, it can either drive high-resolution (18 to 24 bits) ADCs or buffer high-resolution DACs. The EV kit circuit can easily be adapted by installing shunts and changing a few components to support multiple op-amp configurations: transimpedance, noninverting, inverting, or differential amplifier. The components on the EV kit have pads that accommodate 0805 packages, making them easy to solder and replace. The EV kit accepts a single-supply voltage from +4.5V to +36V or a dual-supply voltage from Q2.25V to Q18V. Features S Accommodates Multiple Op-Amp Configurations S +4.5V to +36V Wide Input Supply Range S Shutdown Input S 0805 Components S Proven PCB Layout S Fully Assembled and Tested Ordering Information PART TYPE MAX9632EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION C1, C3 QTY 2 DESCRIPTION QTY JU3 1 3-pin header R1 0 Not installed, resistor (0805) R2, R4 2 100I Q1% resistors (0805) R3, R5 2 0I resistors (0805) U1 1 Single high-voltage op amp (8 TDFN) Maxim MAX9632ATA+ — 3 Shunts — 1 PCB: MAX9632 EVALUATION KIT+ 0.1FF Q10%, 50V X7R ceramic capacitors (0805) Murata GRM21BR71H104K TDK C2012X7R1H104K 2 4.7FF Q10%, 50V X5R ceramic capacitors (1210) Murata GRM32ER71H475M TDK C3225X7R1H475M C5, C6, C7 0 Not installed, ceramic capacitors (0805) JU1, JU2 2 2-pin headers C2, C4 DESIGNATION DESCRIPTION Component Suppliers SUPPLIER Murata Electronics North America, Inc. PHONE 770-436-1300 WEBSITE www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX9632 when contacting these component suppliers. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. 19-5592; Rev 1; 2/14 MAX9632 Evaluation Kit Evaluates: MAX9632 Quick Start • MAX9632 EV kit Required Equipment • ±15V, 40mA DC power supply (PS1) • +1V precision voltage source • Digital multimeter (DMM) Procedure The EV kit is fully assembled and tested. Follow the steps below to verify board operation: 1) Connect the positive terminal of the +15V supply to the VCC pad and the GND terminal to the GND pad. Connect the negative terminal of the -15V supply to the VEE pad and the GND terminal to the GND pad. The power supplies should be off. 2) Connect the positive terminal of the precision voltage source to the IN- pad. Connect the negative terminal of the precision voltage source to the IN+ pad. 3) Install a shunt on jumper JU2 to short IN+ to GND. 4) With the 100I feedback resistor and on-board 100I resistor, the gain is -1 (inverting configuration). 5) Connect the DMM to monitor the voltage on the OUT pad. 6) Turn on the Q15V power supply. 7) Apply 1V from the precision voltage source. Observe the output at the OUT pad on the DMM. OUT should read approximately -1V. Jumper Selection Jumpers JU1 and JU2 are provided to allow flexibility in grounding inputs for multiple op-amp configurations. When a shunt is installed on JU1 or JU2, the corresponding input pad is referenced to ground. See Table 1 for JU1 and JU2 configuration. See the Op-Amp Configuration section for more information regarding EV kit configuration. Shutdown Mode (SHDN) Jumper JU3 controls the shutdown mode (SHDN) of the device. When SHDN is pulled low, the device is enabled. When the SHDN pin is pulled high, the device is disabled. See Table 2 for JU3 configuration. Table 1. JU1/JU2 Jumper Selection SHUNT POSITION IN-/IN+ INPUT Installed Connected to GND Not installed* Signal applied at IN-/IN+ pad *Default position. Table 2. JU3 Jumper Selection SHUNT POSITION SHDN PIN EV KIT FUNCTION 1-2 Connected to VCC Disabled 2-3* Connected to GND Enabled *Default position. Detailed Description of Hardware The MAX9632 EV kit provides a proven layout for the MAX9632 low-noise op amp to support multiple op-amp configurations. The device accepts a single-supply voltage from +4.5V to +36V, or a dual-supply voltage from Q2.25V to Q18V. 2 Maxim Integrated MAX9632 Evaluation Kit Evaluates: MAX9632 Op-Amp Configuration Transimpedance Application To configure the EV kit as a transimpedance amplifier (TIA), replace R2 with a 0I resistor, install a shunt on jumper JU2, and capacitor C5 remains open. The output voltage of the TIA is the input current multiplied by the feedback resistor: VOUT= − (IIN × IBIAS ) × R4 ± VOS where R4 is installed as a 100I resistor, IIN is defined as IN current, IBIAS is the input bias current, and VOS is the input offset voltage of the op amp. Use capacitor C6 to stabilize the op amp by rolling off high-frequency gain due to a large cable capacitance. Inverting Configuration To configure the EV kit as an inverting amplifier, replace R2 and R4 with the desired 1% gain-setting resistors, install a shunt on jumper JU2, and feed a voltage VIN between the IN- and IN+ pads. Install a shunt on JU2 to ground the IN+ input in this configuration. The output voltage is given by the following equation: R4 VOUT = − (VIN + VOS ) R2 The offset voltage VOS can be either positive or negative. Maxim Integrated Noninverting Configuration To configure the device as a noninverting amplifier, replace R2 and R4 with the desired 1% gain-setting resistors, and feed a voltage VIN between the IN+ and IN- pads. Install a shunt on JU1 to ground the IN- input in this configuration. The output voltage is given by the following equation: R4 VOUT = (1 + )(VIN ± VOS ) R2 Differential Amplifier To configure the EV kit as a differential amplifier, replace R1–R4 with appropriate resistors. Make sure R1 = R4 and R2 = R3. The CMRR of the differential amplifier is determined by the matching of the resistor ratios R4/R2 and R1/R3: R4 R1 = VOUT = Gain(INP − INN), where Gain = R2 R3 Capacitive Loads Some applications require driving large capacitive loads. To improve the stability of the amplifier in such cases, replace R5 with a suitable resistor value to improve amplifier phase margin. The R5/C7 filter can also be used as an anti-alias filter or to limit amplifier output noise by reducing its output bandwidth. 3 MAX9632 Evaluation Kit Evaluates: MAX9632 Figure 1. MAX9632 EV Kit Schematic 4 Maxim Integrated MAX9632 Evaluation Kit Evaluates: MAX9632 1.0” Figure 2. MAX9632 EV Kit Component Placement Guide— Component Side 1.0” Figure 3. MAX9632 EV Kit PCB Layout—Component Side 1.0” Figure 4. MAX9632 EV Kit PCB Layout—Solder Side Maxim Integrated 5 MAX9632 Evaluation Kit Evaluates: MAX9632 Revision History REVISION NUMBER REVISION DATE 0 10/10 Initial release — 1 2/14 Corrected equations and descriptions of configurations 3 DESCRIPTION PAGES CHANGED 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 © 2014 Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.