Evaluates: MAX9922/MAX9923 19-4487 Rev 0 3/09 MAX9922 Evaluation Kit General Description Features The MAX9922 evaluation kit (EV kit) is a fully assembled Bidirectional or Unidirectional Current Sensing and tested PCB used to evaluate the MAX9922 and Shutdown Logic Input Control MAX9923 ultra-precision, high-side current-sense amplifiers. An ultra-low offset voltage (V ) of 10V OS Multiple Gains Available (max) allows accurate measurement of currents at both Adjustable (MAX9922) extremes of sense voltages (V ), from 10mV to SENSE 25V/V (MAX9923T) 100mV. The EV kit has a 1.9V to 28V input common- 100V/V (MAX9923H) mode sense voltage range that is independent of the 250V/V (MAX9923F) 2.85V to 5.5V V supply. DD 2.85V to 5.5V Supply Range (V ) DD The MAX9922 EV kit comes assembled with the MAX9922 IC with adjustable gain, but can also evaluate 1.9V to 28V Input Common-Mode Range the MAX9923 ICs with fixed gains of 25V/V Independent of V DD (MAX9923T), 100V/V (MAX9923H), and 250V/V Lead(Pb)-Free and RoHS Compliant (MAX9923F). The MAX9922/MAX9923 are capable of both unidirectional and bidirectional operation. Fully Assembled and Tested Ordering Information PART TYPE MAX9922EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List COMPONENT QTY DESCRIPTION COMPONENT QTY DESCRIPTION R2 1 249k 0.1% resistor (0603) 4.7F 10%, 6.3V X5R ceramic R3 1 1k 0.1% resistor (0603) capacitor (0603) C1 1 Murata GRM188R70J475K R4 1 100k 5% resistor (0603) TDK C1608X5R0J475K R5, R6 2 1k 5% resistors (0603) 0.1F 10%, 25V X7R ceramic Not installed, resistorsshort PC R7, R8, R9 0 capacitors (0603) trace (0603) C2, C7 2 TDK C1608X7R1E104K Test point Murata GRM188R71E104K SHDN 1 Keystone 5000 C3, C4, C5, C8 0 Not installed, capacitors (0603) High-side current-sense amplifier 1000pF 10%, 50V X7R ceramic U1 1 (10 MAX ) capacitor (0603) Maxim MAX9922EUB+ C6 1 Murata GRM1885C1H102J 3 Shunts TDK C1608X7R1H102K 1 PCB: MAX9922/3 Evaluation Kit+ JU1, JU2 2 2-pin headers MAX is a registered trademark of Maxim Integrated Products, Inc. JU3 1 3-pin header 0.1 1% current-sense resistor R1 1 (1206) IRC LRC-LR1206LF-01-R100-F 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.MAX9922 Evaluation Kit Component Suppliers SUPPLIER PHONE WEBSITE IRC, Inc. 361-992-7900 www.irctt.com Keystone Electronics Corp. 209-796-2032 www.keyelco.com Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX9922 when contacting these component suppliers. Quick Start Detailed Description of Hardware The MAX9922 EV kit is a current-sense amplifier that Recommended Equipment measures the load current and provides an analog volt- 12V, 100mA power supply (VSOURCE) age output. The EV kit comes assembled with the 3.3V power supply (VDD) MAX9922 IC, which allows adjustable gain with a pair of external resistors (R2 and R3) between OUT, FB, and Electronic load capable of sinking 100mA REF. The EV kit is configured for bidirectional current Digital voltmeter (DVM) sensing. The output voltage (V ) is given by the fol- OUT lowing equation: Procedure The MAX9922 EV kit is fully assembled and tested. R2 Follow the steps below to verify board operation. VR=+ +IV 1 OUT SENSE SENSE REF R3 Caution: Do not turn on power supplies until all con- nections are completed. where R = 0.1, I = load current, and V = SENSE SENSE REF 1) Verify that all jumpers (JU1, JU2, and JU3) are in their V /2. For unidirectional operation, the output voltage DD default positions, as shown in Tables 1, 2, and 3. (V ) is given by the following equation: OUT 2) Set the input power supply to 12V. Connect the R2 VR= 1+ I ground of the power supply to the PGND pad, and OUT SENSE SENSE R3 connect the positive terminal to the VSOURCE pad. 3) Set the VDD power supply to 3.3V. Connect the Shutdown Input Control ground of the VDD supply to the GND pad and The MAX9922 EV kit features 2-pin jumper JU1 to con- connect the positive terminal to the VDD pad. trol the logic shutdown input. For normal operation, remove the shunt from jumper JU1 to drive SHDN high. 4) Set the electronic load to sink 100mA. To place the device in shutdown mode, drive SHDN low 5) Connect the loads ground to the GND pad. by placing a shunt across the JU1 pins. Table 1 sum- Connect the electronic loads positive terminal to marizes jumper JU1s function. the LOAD pad. 6) Connect the DVM across the VOUT pad and the GND pad. Table 1. Jumper JU1 Function (SHDN) 7) Turn on the 3.3V power supply. SHUNT SHDN PIN MODE 8) Turn on the 12V power supply. POSITION 9) Adjust the electronic load current (I ) between Installed Connected to GND Shutdown mode SENSE 0A and 100mA and verify that V is proportional OUT Connected to VDD Not installed* Normal operation to V according to the following equation: SENSE through pullup resistor R4 *Default position. R2 VR=+ +IV 1 OUT SENSE SENSE REF R3 where R = R1 and V = V /2. SENSE REF DD 2 Evaluates: MAX9922/MAX9923