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MAX4207ETE+T

P1-P3P4-P6P7-P9P10-P12P13-P15
General Description
The MAX4207 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 dual ±2.7V to
±5.5V supplies and is capable of measuring five
decades of input current across a 10nA to 1mA range.
The MAX4207’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 MAX4207. The output-offset voltage
and the adjustable scale factor are also set using exter-
nal resistors.
The MAX4207 is available in a space-saving 16-pin thin
QFN package (4mm x 4mm x 0.8mm), and is specified
for operation over the -40°C to +85°C extended temper-
ature range.
Applications
Photodiode Current Monitoring
Portable Instrumentation
Medical Instrumentation
Analog Signal Processing
Features
♦ ±2.7V to ±5.5V Dual-Supply Operation
♦ 5 Decades of Dynamic Range (10nA to 1mA)
♦ Monotonic Over a 1nA to 1mA Range
♦ -0.25V/Decade Internally Trimmed Output Scale
Factor
♦ Adjustable Output Scale Factor
♦ Adjustable Output Offset Voltage
♦ Internal 10nA to 10µA Reference Current Source
♦ Input Amplifiers Summing Nodes at Ground
♦ Small 16-Pin Thin QFN Package (4mm x 4mm x
0.8mm)
♦ -40°C to +85°C Operating Temperature Range
♦ Evaluation Kit Available (Order MAX4206EVKIT)
MAX4207
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
MAX4207
V
EE
GND
REFIIN
REFIOUT
LOGIIN
REFISET
SCALE
LOGV2
LOGV1
OSADJ
CMVIN
CMVOUT
REFVOUT
V
CC
V
EE
V
CC
R
COMP
C
COMP
R
SET
R1
R2
0.1µF
I
IN
V
OUT
0.1µF
R
COMP
C
COMP
R4
R3
Typical Operating Circuit
19-3070; Rev 1; 6/04
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.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX4207ETE -40°C to +85°C 16 Thin QFN-EP*
*EP = Exposed paddle.
16 15 14 13
CMVIN
LOGIIN
REFIIN
REFIOUT
9
10
11
12
N.C.
V
CC
REFISET
CMVOUT
4
3
2
1
V
EE
GND
REFVOUT
N.C.
5678
LOGV1
OSADJ
SCALE
LOGV2
MAX4207
TOP VIEW
(LEADS ON BOTTOM)
THIN QFN
Pin Configuration
MAX4207
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
(All voltages referenced to GND, unless otherwise noted.)
V
CC
...........................................................................-0.3V to +6V
V
EE
............................................................................-6V to +0.3V
Supply Voltage (V
CC
to V
EE
) .............................................. +12V
REFVOUT....................................................(V
EE
- 0.3V) to +3.0V
OSADJ, SCALE, REFISET...........................(V
EE
- 0.3V) to +5.5V
REFIIN, LOGIIN ........................................(V
EE
- 0.3V) to V
CMVIN
LOGV1, LOGV2, CMVOUT,
REFIOUT ......................................(V
EE
- 0.3V) to (V
CC
+ 0.3V)
CMVIN............................................................(V
EE
- 0.3V) to +1V
Continuous Current (REFIIN, LOGIIN) ................................10mA
Continuous Power Dissipation (T
A
= +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
DC ELECTRICAL CHARACTERISTICS—Dual-Supply Operation
(V
CC
= +5V, V
EE
= -5V, GND = 0, I
REF
= 1µA, I
LOG
= 10µA, LOGV2 = SCALE, LOGV1 = OSADJ, CMVIN = CMVOUT, R
SET
> 1MΩ,
T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
UNITS
V
CC
(Note 2) 2.7 5.5
Supply Voltage
V
EE
(Note 2)
-2.7 -5.5
V
T
A
= +25°C 5 6
Supply Current I
CC
T
A
= -40°C to +85°C 7.5
mA
Minimum 10 nA
LOGIIN Current Range
(Notes 3, 4)
I
LOG
Maximum 1 mA
Minimum 10 nA
REFIIN Current Range
(Notes 3, 4)
I
REF
Maximum 1 mA
Common-Mode Voltage
V
CMVOUT
0V
Common-Mode Voltage Input
Range
V
CMVIN
0 0.5 V
T
A
= +25°C ±2 ±5
Log Conformity Error V
LC
I
REF
= 10nA,
I
LOG
= 10nA to 1mA,
K = -0.25V/decade
(Note 4)
T
A
= -40°C to +85°C ±10
mV
T
A
= +25°C
-237.5 -250 -262.5
Logarithmic Slope (Scale Factor)
K
T
A
= -40°C to +85°C
-231.25 - 268.75
mV/
decade
Logarithmic Slope (Scale Factor)
Temperature Drift
T
A
= -40°C to +85°C 80
µV/
decade/
°C
Input Offset Voltage V
IO
T
A
= +25°C, |V
CMVIN
- V
REFIIN
|,
|V
CMVIN
- V
LOGIIN
|
0.6 5 mV
Input Offset Voltage Temperature
Drift
V
IOS
|V
CMVIN
- V
REFIIN
|, |V
CMVIN
- V
LOGIIN
|6
µV/°C
T
A
= +25°C
1.218 1.238 1.258
Voltage Reference Output
V
REFVOUT
T
A
= -40°C to +85°C (Note 4)
1.195 1.275
V
MAX4207
Precision Transimpedance Logarithmic
Amplifier with Over 5 Decades of Dynamic Range
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS—Dual-Supply Operation (continued)
(V
CC
= +5V, V
EE
= -5V, GND = 0, I
REF
= 1µA, I
LOG
= 10µA, LOGV2 = SCALE, LOGV1 = OSADJ, CMVIN = CMVOUT, R
SET
> 1MΩ,
T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
UNITS
Voltage Reference Output
Current
I
REFVOUT
1mA
T
A
= +25°C
490 500 510
Current Reference Output
Voltage
V
REFISET
T
A
= -40°C to +85°C (Note 4)
482 518
mV
LOGV2 BUFFER
T
A
= +25°C 0.4 2
Input Offset Voltage V
IO
T
A
= -40°C to +85°C (Note 4) 6
mV
Input Bias Current I
B
(Note 4)
0.01
1nA
V
OH
R
L
to GND = 2kΩ
V
CC
-
0.2
V
CC
-
0.3
Output Voltage Range
V
OL
R
L
to GND = 2kΩ
V
EE
+
0.2
V
EE
+
0.08
V
I
OUT+
Sourcing 34
Output Short-Circuit Current
I
OUT-
Sinking 58
mA
Slew Rate SR 12 V/µs
Unity-Gain Bandwidth GBW 5 MHz
AC ELECTRICAL CHARACTERISTICS—Dual-Supply Operation
(V
CC
= +5V, V
EE
= -5V, GND = 0, I
REF
= 1µA, I
LOG
= 10µA, LOGV2 = SCALE, LOGV1 = OSADJ, CMVIN = CMVOUT, R
SET
> 1MΩ,
T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
UNITS
LOGV2 Total Noise
0.1Hz to 10Hz, total output-referred noise,
I
REF
= 10nA, I
LOG
= 100nA
17
µV
RMS
LOGV2 Spot Noise Density f = 5kHz, I
REF
= 10nA, I
LOG
= 100nA 0.8
µV/√Hz
REFVOUT Total Noise 1Hz to 10Hz, total output-referred noise 3.3
µV
RMS
REFVOUT Spot Noise Density f = 5kHz
266
nV/√Hz
REFISET Total Noise 1Hz to 10Hz, total output-referred noise
0.67
µV
RMS
REFISET Spot Noise Density f = 5kHz 23
nV/√Hz
Small-Signal Unity-Gain
Bandwidth
I
REF
= 1µA, I
LOG
= 10µA, R
COMP
= 300Ω,
C
COMP
= 32pF
1
MHz
Note 1: All devices are 100% production tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Note 2: Guaranteed and functionally verified.
Note 3: Log conformity error less than ±5mV with scale factor = 0.25V/decade.
Note 4: Guaranteed by design.
P1-P3P4-P6P7-P9P10-P12P13-P15

MAX4207ETE+T

Mfr. #:
Buy MAX4207ETE+T
Manufacturer:
Maxim Integrated
Description:
Logarithmic Amplifiers Transimpedance w/ 100Db Dynamic Range
Lifecycle:
New from this manufacturer.
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