MAX4206 Logarithmic Amplifier Datasheet

MAX4206 Datasheet, PDF, Equivalent


Part Number

MAX4206

Description

Precision Transimpedance Logarithmic Amplifier

Manufacture

Maxim Integrated

Total Page 17 Pages
Datasheet
Download MAX4206 Datasheet


MAX4206
MAX4206
EVALUATION KIT AVAILABLE
Precision Transimpedance
Logarithmic Amplifier with Over
5 Decades of Dynamic Range
General Description
The MAX4206 logarithmic amplifier computes the log
ratio of an input current relative to a reference current
(externally or internally generated) and provides a cor-
responding voltage output with a default 0.25V/decade
scale factor. The device operates from a single +2.7V
to +11V supply or from dual ±2.7V to ±5.5V supplies
and is capable of measuring five decades of input cur-
rent across a 10nA to 1mA range.
The MAX4206’s uncommitted op amp can be used for
a variety of functions, including filtering noise, adding
offset, and adding additional gain. A 0.5V reference is
also included to generate an optional precision current
reference using an external resistor, which adjusts the
log intercept of the MAX4206. The output-offset voltage
and the adjustable scale factor are also set using exter-
nal resistors.
The MAX4206 is available in a space-saving 16-pin
TQFN package (4mm x 4mm x 0.8mm), and is speci-
fied for operation over the -40°C to +85°C extended
temperature range.
Applications
Photodiode Current Monitoring
Portable Instrumentation
Medical Instrumentation
Analog Signal Processing
Pin Configuration
TOP VIEW
(LEADS ON BOTTOM)
16 15 14 13
N.C.
REFVOUT
GND
VEE
1
2
3
4
MAX4206
12 CMVOUT
11 REFISET
10 VCC
9 N.C.
5678
THIN QFN
Benefits and Features
Single Supply Capability Reduces System Power
Supply Requirements
+2.7V to +11V Single-Supply Operation
Also Supports ±2.7V to ±5.5V Dual-Supply
Operation if Required
Wide Dynamic Range Supports Most Photodiode
Current Measurement Applications
5 Decades of Dynamic Range (10nA to 1mA)
Monotonic Over a 1nA to 1mA Range
Adjustable Output Scale Factor
0.25V/Decade Internally Trimmed Output Scale
Factor
Adjustable Output Offset Voltage
Internal 10nA to 10µA Reference Current Source
0.5V Input Common-Mode Voltage
Small Package and Few External Components
Saves Space and Simplifies Design-In
16-Pin TQFN Package (4mm x 4mm x0.8mm)
Ordering Information
PART
TEMP RANGE
MAX4206ETE
-40°C to +85°C
*EP = Exposed pad.
PIN-PACKAGE
16 TQFN-EP*
Typical Operating Circuit
IIN
0.1µF
CCOMP
RCOMP
CCOMP
RCOMP
0.1µF
VCC
LOGIIN
VCC
LOGV2
REFIOUT
REFIIN
SCALE
MAX4206
VOUT
R2
R1
REFVOUT
CMVIN
CMVOUT
LOGV1
0.1µF
ROS
REFISET
OSADJ
RSET GND VEE
19-3071; Rev 2; 5/15

MAX4206
MAX4206
Precision Transimpedance
Logarithmic Amplifier with Over
5 Decades of Dynamic Range
Absolute Maximum Ratings
(All voltages referenced to GND, unless otherwise noted.)
VCC .........................................................................-0.3V to +12V
VEE............................................................................-6V to +0.3V
Supply Voltage (VCC to VEE) .............................................. +12V
REFVOUT ....................................................(VEE - 0.3V) to +3.0V
OSADJ, SCALE, REFISET ...........................(VEE - 0.3V) to +5.5V
REFIIN, LOGIIN ........................................(VEE - 0.3V) to VCMVIN
LOGV1, LOGV2, CMVOUT,
REFIOUT ......................................(VEE - 0.3V) to (VCC + 0.3V)
CMVIN............................................................(VEE - 0.3V) to +1V
Continuous Current (REFIIN, LOGIIN) ................................10mA
Continuous Power Dissipation (TA = +70°C)
16-Pin Thin QFN (derate 16.9mW/°C above +70°C) ....1349mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
DC Electrical Characteristics—Single-Supply Operation
(VCC = +5V, VEE = GND = 0V, IREF = 1µA, ILOG = 10µA, LOGV2 = SCALE, LOGV1 = OSADJ, CMVIN = CMVOUT, RSET > 1MΩ,
TA = -40°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Supply Voltage
Supply Current
LOGIIN Current Range (Notes 3, 4)
VCC
ICC
ILOG
(Note 2)
TA = +25°C
TA = -40°C to +85°C
Minimum
Maximum
2.7 11.0 V
3.9 5
mA
7
10 nA
1 mA
REFIIN Current Range (Notes 3, 4)
Minimum
IREF Maximum
10 nA
1 mA
Common-Mode Voltage
VCMVOUT
480 500 520
mV
Common-Mode Voltage Input
Range
VCMVIN
0.5 1.0 V
Log Conformity Error
IREF = 10nA,
TA = +25°C
VLC
ILOG= 10nA to 1mA,
K = 0.25V/decade
(Note 4)
TA = -40°C to +85°C
±2 ±5
mV
±10
Logarithmic Slope (Scale Factor)
Logarithmic Slope (Scale Factor)
Temperature Drift
K TA = +25°C
TA = -40°C to +85°C (Note 4)
TA = -40°C to +85°C
Input Offset Voltage
Input Offset Voltage Temperature
Drift
Voltage Reference Output
Voltage Reference Output Current
Current Reference Output Voltage
VIO
TA = +25°C, |VCMVIN - VREFIIN|,
|VCMVIN - VLOGIIN|
VIOS
|VCMVIN - VREFIIN|, |VCMVIN - VLOGIIN|
VREFVOUT
IREFVOUT
VREFISET
TA = +25°C
TA = -40°C to +85°C (Note 4)
TA = +25°C
TA = -40°C to +85°C (Note 4)
237.5 250 262.5 mV/
231.25
268.75 decade
µV/
80 decade/
°C
1 5 mV
1.218
1.195
490
482
6
1.238
1
500
1.258
1.275
510
518
µV/°C
V
mA
mV
www.maximintegrated.com
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Features MAX4206 EVALUATION KIT AVAILABLE Precis ion Transimpedance Logarithmic Amplifie r with Over 5 Decades of Dynamic Range General Description The MAX4206 logari thmic amplifier computes the log ratio of an input current relative to a refer ence current (externally or internally generated) and provides a corresponding voltage output with a default 0.25V/de cade scale factor. The device operates from a single +2.7V to +11V supply or f rom dual ±2.7V to ±5.5V supplies and is capable of measuring five decades of input current across a 10nA to 1mA ran ge. The MAX4206’s uncommitted op amp can be used for a variety of functions, including filtering noise, adding offs et, and adding additional gain. A 0.5V reference is also included to generate an optional precision current reference using an external resistor, which adju sts the log intercept of the MAX4206. T he output-offset voltage and the adjust able scale factor are also set using ex ternal resistors. The MAX4206 is available in a space-saving 16-pin.
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