MAX4206EVKIT

19-3397; Rev 0; 8/04 MAX4206 Evaluation Kit Features ♦ +2.7V to +11V Single-Supply Operation or ±2.7V to ±5.5V Dual-Supply Operation ♦ Selectable 10nA/100nA/1µA/10µA On-Board Reference Current ♦ Adjustable Output Scale Factor ♦ Surface-Mount Construction ♦ Fully Assembled and Tested The MAX4206 EV kit can be used to evaluate the MAX4207 by changing the IC and the input RC networks R1, R2, C7, and C8. Ordering Information PART MAX4206EVKIT TEMP RANGE PIN PACKAGE 0°C to +70°C 16 Thin QFN-EP* (4mm x 4mm) *EP = Exposed paddle. Note: To evaluate the MAX4207, order a MAX4207ETE free sample with the MAX4206EVKIT. Component List DESIGNATION QTY C1 1 10µF ±20%, 16V X5R ceramic capacitor (1206) TDK C3216X5R1C106M 1 10µF ±20%, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ106MG or TDK C2012X5R0J106M C2 DESCRIPTION 4 0.1µF ±10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104K C7, C8 2 100pF ±5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H101J or TDK C1608C0G1H101J D1, D2 0 Not installed, photodiode (TO-46) C3–C6 R1, R2 2 100Ω ±1% resistors (0603) R3 0 Not installed, resistor (0603) R4 0 Not installed, potentiometer 1 30.1kΩ ±0.1%, precision chip resistor (0603) ICR PCF-W0603R-03-3012-B or Vishay P0603K3012BB R5 DESIGNATION QTY DESCRIPTION 4 10kΩ ±0.1%, precision chip resistors (0603) IRC PCF-W0603R-03-1002-B or Vishay P0603K1002BB 1 4.99MΩ ±0.5%, precision chip resistor (0805) IRC CR0805F4M99D or Vishay D11P10049940.5PN 1 499kΩ ±0.5%, precision chip resistor (0805) IRC PCF-W0805R-03-4993-D or Vishay D11P10049930.5PN 1 49.9kΩ ±0.5%, precision chip resistor (0603) IRC PCF-W0603R-01-4992-D or Vishay D11P10049920.5PN R13 1 4.99kΩ ±0.5%, precision chip resistor (0603) IRC PCF-W0603R-02-4991-D or Vishay D11P10049910.5PN R14 0 Not installed, shorted by PC trace (0603) R6–R9 R10 R11 R12 ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 Evaluates: MAX4206/MAX4207 General Description The MAX4206 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that demonstrates the MAX4206 logarithmic amplifier. The MAX4206 computes the log ratio of an input current relative to a reference current and provides a corresponding voltage output with a default 0.25V/decade scale factor. The EV kit operates from a single +2.7V to +11V supply or from dual ±2.7V to ±5.5V supplies, with the ability to select one of four reference currents. Evaluates: MAX4206/MAX4207 MAX4206 Evaluation Kit Component List (continued) DESIGNATION QTY U1 1 MAX4206ETE (16-pin TQFN 4mm x 4mm) J1, J2 0 Not installed, edge-mount SMA connectors JU1, JU6, JU9, JU10, JU11 5 DESCRIPTION 2-pin headers DESIGNATION QTY DESCRIPTION JU2, JU5, JU7, JU8 4 3-pin headers JU3 1 5-pin header JU4 1 4-pin header None 11 Shunts None 1 MAX4206/7 PC board Component Suppliers SUPPLIER PHONE FAX WEBSITE IRC 361-992-7900 361-992-3377 www.irctt.com Murata 770-436-1300 770-436-3030 www.murata.com Taiyo Yuden 800-348-2496 847-925-0899 www.t-yuden.com TDK 847-803-6100 847-390-4405 www.component.tdk.com Vishay 402-564-3131 402-563-6296 www.vishay.com Note: Indicate that you are using the MAX4206/MAX4207 when contacting these suppliers. The MAX4206 EV kit is a fully assembled and tested surface-mount board. Follow the steps below for board operation. Do not turn on the power supply until all connections are complete. 6) Connect a 100µA current source to the LOGIIN pad. 7) Turn on the power supply and verify the output voltages LOGV1 = 0.75V and LOGV2 = 3.00V. Note: For dual-supply operation, JU1 should be open. Reset the VCC and VDD to within operation range. Recommended Equipment Detailed Description Quick Start • • Current source capable of sourcing 10nA to 1mA current Single +2.7V to +11V, 20mA DC power supply Evaluating the MAX4206 with Single Supply 1) Verify that shunts are connected across jumpers JU1 and JU11 (single-supply operation, sets CMVIN = CMVOUT). 2) Verify that shunts are connected across jumpers JU4 (pins 1 and 4), JU5 (pins 2 and 3), JU6, and JU7 (pins 1 and 2) (sets output scale factor K = 1V/decade). 3) Verify that shunts are connected across jumpers JU8 (pins 2 and 3) and JU3 (pins 1 and 3) (sets onboard reference current = 100nA). Jumper Selection Jumper JU3 controls the REFISET pin of the MAX4206/ MAX4207 device. See Table 1 for JU3 function. Table 1. JU3 Function JU3 SHUNT POSITION REFERENCE CURRENT Pins 1 and 2 10nA Pins 1 and 3 100nA Pins 1 and 4 1µA Pins 1 and 5 10µA Note: Make sure a shunt is across pins 2 and 3 of JU8 when using the on-board reference current source. 4) Verify that there is no shunt across jumpers JU2, JU9, and JU10. 5) Connect a +5V power supply to the VCC pad. Connect the power-supply ground to the GND pad. 2 _______________________________________________________________________________________ MAX4206 Evaluation Kit SCALE FACTOR (V/decade) 0.25 0.50 JU2 SHUNT POSITION JU4 SHUNT POSITION JU5 SHUNT POSITION JU6 SHUNT POSITION JU7 SHUNT POSITION Not installed Pins 1 and 2 Pins 2 and 3 Installed Pins 1 and 2 Not installed Pins 1 and 3 Pins 2 and 3 Installed Pins 1 and 2 Not installed Pins 1 and 2 Pins 1 and 2 Installed Pins 1 and 2 0.75 Not installed Pins 1 and 3 Pins 1 and 2 Installed Pins 1 and 2 1.00 Not installed Pins 1 and 4 Pins 2 and 3 Installed Pins 1 and 2 1.25 Not installed Pins 1 and 4 Pins 1 and 2 Installed Pins 1 and 2 Table 3. Setting Output Scale Factor for MAX4206 (Dual-Supply Operation)/MAX4207 SCALE FACTOR (V/decade) JU2 SHUNT POSITION JU4 SHUNT POSITION JU5 SHUNT POSITION JU6 SHUNT POSITION JU7 SHUNT POSITION Pins 2 and 3 Pins 1 and 3 Pins 2 and 3 Not Installed Pins 2 and 3 Pins 2 and 3 Pins 1 and 2 Pins 1 and 2 Not Installed Pins 2 and 3 0.50 Pins 2 and 3 Pins 1 and 3 Pins 1 and 2 Not Installed Pins 2 and 3 0.75 Pins 2 and 3 Pins 1 and 4 Pins 2 and 3 Not Installed Pins 2 and 3 1.00 Pins 2 and 3 Pins 1 and 4 Pins 1 and 2 Not Installed Pins 2 and 3 0.25 The EV kit incorporates jumpers JU2 and JU4–JU7 to set the output scale factor. See Tables 2 and 3 for setting the output scale factor for the MAX4206 and MAX4207. Jumper JU8 controls the REFIIN pin of the MAX4206/ MAX4207 device. See Table 4 for JU8 function. The EV kit incorporates jumper JU11 to create a connection between CMVIN and CMVOUT pins. To set the common-mode voltage input to a voltage other than 0.5V (MAX4206) or 0V (MAX4207), remove the shunt across JU11, and then connect a desired commonmode voltage on the CMVIN pad. Output Offset (MAX4206) To adjust the output offset voltage for single-supply operation, cut open the short on R14, install a resistor on the R14 pads, and then apply a current on the OSADJ pad. The value of R14 can be calculated by the following equation: R14 = VOS / IOSADJ where VOS is the desired offset voltage, and IOSADJ is a user-supplied offset current. Evaluating the MAX4207 To evaluate the MAX4207 with the MAX4206 EV kit, replace the MAX4206ETE with a MAX4207ETE, replace R1, R2, C7, and C8 with component values 330Ω, 330Ω, 33pF, and 33pF, respectively. Jumper JU1 must be open to ensure proper operation with dual supplies. Table 4. JU8 Function JU8 SHUNT POSITION REFIIN PIN Pins 1 and 2 REFIIN is connected to the REFIIN pad, requiring an external reference source. Pins 2 and 3 REFIIN is connected to the REFIOUT pad, using the internal reference current source. _______________________________________________________________________________________ 3 Evaluates: MAX4206/MAX4207 Table 2. Setting Output Scale Factor for MAX4206 (Single-Supply Operation) Evaluates: MAX4206/MAX4207 MAX4206 Evaluation Kit Evaluating the MAX4207 (Dual-Supply Operation) 1) Verify that there is no shunt across jumpers JU1, JU9, and JU10 (dual-supply operation). 2) Verify that there is a shunt across JU11 (sets CMVIN = CMVOUT). 3) Verify that shunts are connected across jumpers JU2 (pins 2 and 3), JU4 (pins 1 and 4), JU5 (pins 1 and 2), and JU7 (pins 2 and 3); and JU6 is open (sets output scale factor K = 1V/decade). 4) Verify that shunts are connected across jumpers JU8 (pins 2 and 3) and JU3 (pins 1 and 3) (sets onboard reference current = 100nA). 5) Connect a +5V power supply to the VCC pad. Connect the power-supply ground to the GND pad. Connect a -5V power supply to the VEE pad. 4 6) Connect a 100µA current source to the LOGIIN pad. 7) Turn on the power supply and verify the output voltages LOGV1 = -0.75V and LOGV2 = 3.00V. Output Offset Adjustment (MAX4207) The MAX4207 accepts a large output-offset voltage adjustment at the inverting configuration. To adjust the output offset voltage, install a resistor on R3 and potentiometer on R4 pads, and make sure there is a shunt across JU2 (pins 1 and 2). The magnitude of the offset voltage is given by the following equation: VOS = REFOUT x (R4 / (R3 + R4)) x (1 + RCOMB / R6) where VOS is the desired offset voltage, and RCOMB is the effective resistance between the LOGV2 and SCALE pins. _______________________________________________________________________________________ MAX4206 Evaluation Kit Evaluates: MAX4206/MAX4207 GND VCC VEE JU1 VBIAS1 LOGIIN JU9 D1 PHOTODIODE OPEN SMA C3 0.1µF 25V C4 0.1µF 25V 10 VCC 3 OSADJ 3 R14 (PC TRACE) SHORT GND 4 VEE LOGV1 LOGIIN 1 5 JU7 C7 100pF 1 1 2 GND C2 10µF 6.3V LOGV1 1 15 J1 C1 10µF 16V R1 100Ω 1% U1 9 R6 10kΩ 0.1% N.C. SCALE 7 16 C5 0.1µF CMVIN LOGV2 4 JU4 1 8 2 1 3 JU8 14 C8 100pF 3 OSADJ OSADJ 3 2 6 OSADJ 2 1 R8 10kΩ 0.1% R9 10kΩ 0.1% VBIAS2 1 1 3 JU5 REFVOUT REFIIN 2 JU6 REFIOUT 13 C6 0.1µF R4 OPEN R5 30.1kΩ 0.1% R7 10kΩ 0.1% CMVOUT REFIOUT REFVOUT R3 OPEN 3 2 JU11 12 SCALE LOGV2 N.C. MAX4206 CMVIN 2 3 REFISET R2 100Ω 1% 11 JU2 1 2 3 1 1 D2 PHOTODIODE OPEN JU10 REFIIN J2 SMA 2 GND 2 JU3 3 5 4 R13 4.99kΩ 0.5% R12 49.9kΩ 0.5% R11 499kΩ 0.5% R10 4.99MΩ 0.5% Figure 1. MAX4206 EV Kit Schematic _______________________________________________________________________________________ 5 Evaluates: MAX4206/MAX4207 MAX4206 Evaluation Kit Figure 2. MAX4206 EV Kit Component Placement Guide— Component Side Figure 3. MAX4206 EV Kit PC Board Layout—Component Side Figure 4. MAX4206 EV Kit PC Board Layout—Solder Side Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 6 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.