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19-3397; Rev 0; 8/04
MAX4206 Evaluation Kit
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. 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.
PART MAX4206EVKIT
Features
+2.7V to +11V Single-Supply Operation or 2.7V to 5.5V Dual-Supply Operation Selectable 10nA/100nA/1A/10A On-Board Reference Current Adjustable Output Scale Factor Surface-Mount Construction Fully Assembled and Tested
Evaluates: MAX4206/MAX4207
Ordering Information
TEMP RANGE 0C to +70C PIN PACKAGE 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 C1 QTY 1 DESCRIPTION 10F 20%, 16V X5R ceramic capacitor (1206) TDK C3216X5R1C106M 10F 20%, 6.3V X5R ceramic capacitor (0805) Taiyo Yuden JMK212BJ106MG or TDK C2012X5R0J106M 0.1F 10%, 25V X7R ceramic capacitors (0603) TDK C1608X7R1E104K 100pF 5%, 50V C0G ceramic capacitors (0603) Murata GRM1885C1H101J or TDK C1608C0G1H101J Not installed, photodiode (TO-46) 100 1% resistors (0603) Not installed, resistor (0603) Not installed, potentiometer 30.1k 0.1%, precision chip resistor (0603) ICR PCF-W0603R-03-3012-B or Vishay P0603K3012BB R13 1 DESIGNATION QTY DESCRIPTION 10k 0.1%, precision chip resistors (0603) IRC PCF-W0603R-03-1002-B or Vishay P0603K1002BB 4.99M 0.5%, precision chip resistor (0805) IRC CR0805F4M99D or Vishay D11P10049940.5PN 499k 0.5%, precision chip resistor (0805) IRC PCF-W0805R-03-4993-D or Vishay D11P10049930.5PN 49.9k 0.5%, precision chip resistor (0603) IRC PCF-W0603R-01-4992-D or Vishay D11P10049920.5PN 4.99k 0.5%, precision chip resistor (0603) IRC PCF-W0603R-02-4991-D or Vishay D11P10049910.5PN Not installed, shorted by PC trace (0603)
R6-R9
4
C2
1
R10
1
C3-C6
4
R11
1
C7, C8
2
R12
1
D1, D2 R1, R2 R3 R4
0 2 0 0
R5
1
R14
0
________________________________________________________________ Maxim Integrated Products
1
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.
MAX4206 Evaluation Kit Evaluates: MAX4206/MAX4207
Component List (continued)
DESIGNATION U1 J1, J2 JU1, JU6, JU9, JU10, JU11 QTY 1 0 5 DESCRIPTION MAX4206ETE (16-pin TQFN 4mm x 4mm) Not installed, edge-mount SMA connectors 2-pin headers DESIGNATION JU2, JU5, JU7, JU8 JU3 JU4 None None QTY 4 1 1 11 1 DESCRIPTION 3-pin headers 5-pin header 4-pin header Shunts MAX4206/7 PC board
Component Suppliers
SUPPLIER IRC Murata Taiyo Yuden TDK Vishay PHONE 361-992-7900 770-436-1300 800-348-2496 847-803-6100 402-564-3131 FAX 361-992-3377 770-436-3030 847-925-0899 847-390-4405 402-563-6296 WEBSITE www.irctt.com www.murata.com www.t-yuden.com www.component.tdk.com www.vishay.com
Note: Indicate that you are using the MAX4206/MAX4207 when contacting these suppliers.
Quick Start
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 100A 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
* * Current source capable of sourcing 10nA to 1mA current Single +2.7V to +11V, 20mA DC power supply
Detailed Description
Jumper Selection
Jumper JU3 controls the REFISET pin of the MAX4206/ MAX4207 device. See Table 1 for JU3 function.
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). 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.
Table 1. JU3 Function
JU3 SHUNT POSITION Pins 1 and 2 Pins 1 and 3 Pins 1 and 4 Pins 1 and 5 REFERENCE CURRENT 10nA 100nA 1A 10A
Note: Make sure a shunt is across pins 2 and 3 of JU8 when using the on-board reference current source.
2
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MAX4206 Evaluation Kit Evaluates: MAX4206/MAX4207
Table 2. Setting Output Scale Factor for MAX4206 (Single-Supply Operation)
SCALE FACTOR (V/decade) 0.25 0.50 0.75 1.00 1.25 JU2 SHUNT POSITION Not installed Not installed Not installed Not installed Not installed Not installed JU4 SHUNT POSITION Pins 1 and 2 Pins 1 and 3 Pins 1 and 2 Pins 1 and 3 Pins 1 and 4 Pins 1 and 4 JU5 SHUNT POSITION Pins 2 and 3 Pins 2 and 3 Pins 1 and 2 Pins 1 and 2 Pins 2 and 3 Pins 1 and 2 JU6 SHUNT POSITION Installed Installed Installed Installed Installed Installed JU7 SHUNT POSITION Pins 1 and 2 Pins 1 and 2 Pins 1 and 2 Pins 1 and 2 Pins 1 and 2 Pins 1 and 2
Table 3. Setting Output Scale Factor for MAX4206 (Dual-Supply Operation)/MAX4207
SCALE FACTOR (V/decade) 0.25 0.50 0.75 1.00 JU2 SHUNT POSITION Pins 2 and 3 Pins 2 and 3 Pins 2 and 3 Pins 2 and 3 Pins 2 and 3 JU4 SHUNT POSITION Pins 1 and 3 Pins 1 and 2 Pins 1 and 3 Pins 1 and 4 Pins 1 and 4 JU5 SHUNT POSITION Pins 2 and 3 Pins 1 and 2 Pins 1 and 2 Pins 2 and 3 Pins 1 and 2 JU6 SHUNT POSITION Not Installed Not Installed Not Installed Not Installed Not Installed JU7 SHUNT POSITION Pins 2 and 3 Pins 2 and 3 Pins 2 and 3 Pins 2 and 3 Pins 2 and 3
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.
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 330, 330, 33pF, and 33pF, respectively. Jumper JU1 must be open to ensure proper operation with dual supplies.
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.
Table 4. JU8 Function
JU8 SHUNT POSITION Pins 1 and 2 Pins 2 and 3 REFIIN PIN REFIIN is connected to the REFIIN pad, requiring an external reference source. REFIIN is connected to the REFIOUT pad, using the internal reference current source.
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3
MAX4206 Evaluation Kit Evaluates: MAX4206/MAX4207
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. 6) Connect a 100A 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.
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MAX4206 Evaluation Kit Evaluates: MAX4206/MAX4207
VCC
GND
VEE
JU1
C1 10F 16V
C2 10F 6.3V
VBIAS1 D1 PHOTODIODE OPEN 1 3
JU9 10 VCC 15 J1 1 C7 100pF 1 2 R1 100 1% N.C. LOGIIN
C3 0.1F 25V 3 GND
C4 0.1F 25V LOGV1 4 VEE LOGV1 5
OSADJ R14 (PC TRACE) SHORT 1 JU7 R6 10k 0.1% LOGV2 2 3 SCALE
LOGIIN
SMA GND
U1 9 N.C.
SCALE
7 R5 30.1k 0.1% R7 10k 0.1%
MAX4206
CMVIN C5 0.1F 16 CMVIN LOGV2 8 4 JU4 1 2 JU11 12 CMVOUT REFIOUT 2 C6 0.1F REFIIN 1 R4 OPEN 3 OSADJ 2 1 3 2 JU2 OSADJ 6 OSADJ REFISET 11 14 JU8 C8 100pF R2 100 1% REFVOUT 1 3 2 1 1 3 J2 SMA 2 13 REFIOUT 3
JU6 3 JU5 2 1 R8 10k 0.1% R9 10k 0.1%
REFVOUT
VBIAS2 D2 PHOTODIODE OPEN
R3 OPEN
JU10 REFIIN
GND
1 5
2 JU3 3 4
R13 4.99k 0.5%
R12 49.9k 0.5%
R11 499k 0.5%
R10 4.99M 0.5%
Figure 1. MAX4206 EV Kit Schematic _______________________________________________________________________________________ 5
MAX4206 Evaluation Kit Evaluates: MAX4206/MAX4207
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 (c) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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