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 demon-
strates 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/1µA/10µA On-Board
Reference Current
♦
Adjustable Output Scale Factor
♦
Surface-Mount Construction
♦
Fully Assembled and Tested
Evaluates: MAX4206/MAX4207
Ordering Information
TEMP RANGE
0°C to +70°C
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
10µF ±20%, 16V X5R ceramic
capacitor (1206)
TDK C3216X5R1C106M
10µF ±20%, 6.3V X5R ceramic
capacitor (0805)
Taiyo Yuden JMK212BJ106MG or
TDK C2012X5R0J106M
0.1µF ±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)
100Ω ±1% resistors (0603)
Not installed, resistor (0603)
Not installed, potentiometer
30.1kΩ ±0.1%, precision chip
resistor (0603)
ICR PCF-W0603R-03-3012-B or
Vishay P0603K3012BB
R13
1
DESIGNATION
QTY
DESCRIPTION
10kΩ ±0.1%, precision chip
resistors (0603)
IRC PCF-W0603R-03-1002-B or
Vishay P0603K1002BB
4.99MΩ ±0.5%, precision chip
resistor (0805)
IRC CR0805F4M99D or
Vishay D11P10049940.5PN
499kΩ ±0.5%, precision chip
resistor (0805)
IRC PCF-W0805R-03-4993-D or
Vishay D11P10049930.5PN
49.9kΩ ±0.5%, precision chip
resistor (0603)
IRC PCF-W0603R-01-4992-D or
Vishay D11P10049920.5PN
4.99kΩ ±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 100µA current source to the LOGIIN pad.
7) Turn on the power supply and verify the output volt-
ages LOGV1 = 0.75V and LOGV2 = 3.00V.
Note:
For dual-supply operation, JU1 should be open.
Reset the V
CC
and V
DD
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 on-
board 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
1µA
10µA
Note:
Make sure a shunt is across pins 2 and 3 of JU8 when
using the on-board reference current source.
2
_______________________________________________________________________________________
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 con-
nection 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 common-
mode 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 330Ω,
330Ω, 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 = V
OS
/ I
OSADJ
where V
OS
is the desired offset voltage, and I
OSADJ
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.
_______________________________________________________________________________________
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 on-
board 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 100µA current source to the LOGIIN pad.
7) Turn on the power supply and verify the output volt-
ages 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 poten-
tiometer 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:
V
OS
= REFOUT x (R4 / (R3 + R4)) x (1 + R
COMB
/ R6)
where V
OS
is the desired offset voltage, and R
COMB
is
the effective resistance between the LOGV2 and
SCALE pins.
4
_______________________________________________________________________________________
MAX4206 Evaluation Kit
Evaluates: MAX4206/MAX4207
VCC
GND
VEE
JU1
C1
10µF
16V
C2
10µF
6.3V
VBIAS1
D1
PHOTODIODE
OPEN
1
3
JU9
10
V
CC
15
J1
1
C7
100pF
1
2
R1
100Ω
1%
N.C.
LOGIIN
C3
0.1µF
25V
3
GND
C4
0.1µF
25V
LOGV1
4
V
EE
LOGV1
5
OSADJ
R14
(PC TRACE)
SHORT
1
JU7
R6
10kΩ
0.1%
LOGV2
2
3
SCALE
LOGIIN
SMA
GND
U1
9
N.C.
SCALE
7
R5
30.1kΩ
0.1%
R7
10kΩ
0.1%
MAX4206
CMVIN
C5
0.1µF
16
CMVIN
LOGV2
8
4
JU4 1
2
JU11
12
CMVOUT
REFIOUT
2
C6
0.1µF
REFIIN
1
R4
OPEN
3
OSADJ
2
1
3
2
JU2
OSADJ
6
OSADJ
REFISET
11
14
JU8
C8
100pF
R2
100Ω
1%
REFVOUT
1
3
2
1
1
3
J2
SMA
2
13
REFIOUT
3
JU6
3
JU5
2
1
R8
10kΩ
0.1%
R9
10kΩ
0.1%
REFVOUT
VBIAS2
D2
PHOTODIODE
OPEN
R3
OPEN
JU10
REFIIN
GND
1
5
2 JU3
3
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
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