MAX4207ETE+ Maxim Integrated Products, MAX4207ETE+ Datasheet

IC AMP TRANS LOG 16-TQFN

MAX4207ETE+

Manufacturer Part Number
MAX4207ETE+
Description
IC AMP TRANS LOG 16-TQFN
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX4207ETET.pdf (15 pages)

Specifications of MAX4207ETE+

Amplifier Type
Logarithmic
Number Of Circuits
1
Slew Rate
12 V/µs
Gain Bandwidth Product
5MHz
-3db Bandwidth
1MHz
Current - Input Bias
10pA
Voltage - Input Offset
600µV
Current - Supply
5mA
Current - Output / Channel
58mA
Voltage - Supply, Single/dual (±)
2.7 V ~ 11 V, ±2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-TQFN Exposed Pad
Number Of Channels
1
Input Offset Voltage
2 mV
Supply Current
6 mA
Operating Temperature Range
+ 85 C
Mounting Style
SMD/SMT
Power Dissipation
1349 mW
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Output Type
-
Lead Free Status / Rohs Status
 Details
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.
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.
Amplifier with Over 5 Decades of Dynamic Range
TOP VIEW
(LEADS ON BOTTOM)
Photodiode Current Monitoring
Portable Instrumentation
Medical Instrumentation
Analog Signal Processing
REFVOUT
GND
N.C.
V
EE
1
2
3
4
________________________________________________________________ Maxim Integrated Products
16
5
General Description
THIN QFN
Precision Transimpedance Logarithmic
MAX4207
15
6
Pin Configuration
14
7
13
8
Applications
12
11
10
9
CMVOUT
REFISET
V
N.C.
CC
*EP = Exposed paddle.
MAX4207ETE
±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)
PART
I
IN
R
C
COMP
COMP
0.1µF
C
R
COMP
Typical Operating Circuit
COMP
R
SET
-40°C to +85°C
TEMP RANGE
Ordering Information
LOGIIN
REFIOUT
REFIIN
CMVIN
CMVOUT
REFISET
GND
MAX4207
V
V
CC
CC
V
V
EE
EE
REFVOUT
LOGV2
SCALE
LOGV1
OSADJ
16 Thin QFN-EP*
PIN-PACKAGE
0.1µF
Features
V
OUT
R1
R4
R2
R3
1

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MAX4207ETE+ Summary of contents

Page 1

... THIN QFN ________________________________________________________________ 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. ±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 ...

Page 2

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND, unless otherwise noted.) V ...........................................................................-0. ............................................................................-6V to +0.3V EE Supply Voltage ( .............................................. +12V ...

Page 3

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range DC ELECTRICAL CHARACTERISTICS—Dual-Supply Operation (continued +5V -5V, GND = REF T = -40°C to +85°C. Typical values are ...

Page 4

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range (V = +5V -5V, GND = 0V REF T = +25°C, unless otherwise noted vs. I LOGV1 LOG 0.75 0.50 0.25 0 ...

Page 5

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range (V = +5V -5V, GND = 0V REF T = +25°C, unless otherwise noted.) A NORMALIZED LOG CONFORMANCE ERROR vs. I REF 20 I ...

Page 6

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range (V = +5V -5V, GND = 0V REF T = +25°C, unless otherwise noted VOLTAGE-NOISE DENSITY LOGV2 vs. FREQUENCY 10 10nA 100nA ...

Page 7

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range (V = +5V -5V, GND = 0V REF T = +25°C, unless otherwise noted.) A REFERENCE OUTPUT VOLTAGE (V REFVOUT vs. SUPPLY VOLTAGE (V ...

Page 8

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range PIN NAME 1, 9 N.C. No Connection. Not internally connected. 2 REFVOUT 1.238V Reference Voltage Output. Bypass REFVOUT to GND with 1µF capacitor (optional). 3 GND ...

Page 9

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range LOG LOGIIN CMVIN REF REFIIN V EE Figure 2. Simplified Model of a Logarithmic Amplifier Detailed Description Figure 2 shows a ...

Page 10

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range IDEAL TRANSFER FUNCTION WITH VARYING LOG ( OUT LOG REF 0 0. ...

Page 11

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range Substituting into the TE approximation, TE ≅ ± (1V/decade)(0.05 log 10 ±4 (±5mV ±2mV) = ±[0.15V ±4(±7mV worst case, one finds TE ≅ ±178mV or ±3.6% of ...

Page 12

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range Table 1. MAX4207 Example Configurations LOGV2 AMPLIFIER CONFIGURATION Inverting Noninverting The inverting configuration utilized by the MAX4207 facilitates large output-offset voltage adjustments. The magnitude of the offset voltage is ...

Page 13

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range 2.2µH 2.7V TO 76V PHOTODIODE BIAS 2.2µF 0.22µF I APD FIBER CABLE APD HIGH-SPEED DATA PATH Figure 6. Logarithmic Current-Sensing Amplifier with Sourcing Input REFISET ...

Page 14

Precision Transimpedance Logarithmic Amplifier with Over 5 Decades of Dynamic Range Layout and Bypassing Bypass V and V to GND with ceramic 0.1µ capacitors. Place the capacitors as close to the device as possible. Bypass REFVOUT and/or CMVOUT ...

Page 15

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products ...

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