EVALUATION KIT AVAILABLE Precision Transimpedance MAX4206 Logarithmic Amplifier with Over 5 Decades of Dynamic Range General Description Benefits and Features The MAX4206 logarithmic amplifier computes the log Single Supply Capability Reduces System Power ratio of an input current relative to a reference current Supply Requirements (externally or internally generated) and provides a cor- +2.7V to +11V Single-Supply Operation responding voltage output with a default 0.25V/decade Also Supports 2.7V to 5.5V Dual-Supply scale factor. The device operates from a single +2.7V Operation if Required to +11V supply or from dual 2.7V to 5.5V supplies Wide Dynamic Range Supports Most Photodiode and is capable of measuring five decades of input cur- Current Measurement Applications rent across a 10nA to 1mA range. 5 Decades of Dynamic Range (10nA to 1mA) The MAX4206s uncommitted op amp can be used for Monotonic Over a 1nA to 1mA Range a variety of functions, including filtering noise, adding Adjustable Output Scale Factor offset, and adding additional gain. A 0.5V reference is 0.25V/Decade Internally Trimmed Output Scale also included to generate an optional precision current Factor reference using an external resistor, which adjusts the Adjustable Output Offset Voltage log intercept of the MAX4206. The output-offset voltage Internal 10nA to 10A Reference Current Source and the adjustable scale factor are also set using exter- 0.5V Input Common-Mode Voltage nal resistors. Small Package and Few External Components The MAX4206 is available in a space-saving 16-pin Saves Space and Simplifies Design-In TQFN package (4mm x 4mm x 0.8mm), and is speci- 16-Pin TQFN Package (4mm x 4mm x0.8mm) fied for operation over the -40C to +85C extended temperature range. Ordering Information Applications PART TEMP RANGE PIN-PACKAGE Photodiode Current Monitoring MAX4206ETE -40C to +85C 16 TQFN-EP* Portable Instrumentation *EP = Exposed pad. Medical Instrumentation Typical Operating Circuit Analog Signal Processing V CC Pin Configuration I IN 0.1F TOP VIEW V CC V OUT (LEADS ON BOTTOM) LOGV2 LOGIIN R2 C COMP 16 15 14 13 REFIOUT SCALE R COMP REFIIN C COMP R1 N.C. 1 12 CMVOUT MAX4206 REFVOUT 2 11 REFISET R COMP MAX4206 10 V GND 3 CC CMVIN CMVOUT 0.1F V 4 9 N.C. EE REFVOUT LOGV1 0.1F R OS 56 7 8 REFISET OSADJ GND V EE R SET THIN QFN 19-3071 Rev 2 5/15 LOGV1 CMVIN OSADJ LOGIIN SCALE REFIIN LOGV2 REFIOUTPrecision Transimpedance MAX4206 Logarithmic Amplifier with Over 5 Decades of Dynamic Range Absolute Maximum Ratings (All voltages referenced to GND, unless otherwise noted.) CMVIN............................................................(V - 0.3V) to +1V EE V .........................................................................-0.3V to +12V Continuous Current (REFIIN, LOGIIN) ................................10mA CC V ............................................................................-6V to +0.3V Continuous Power Dissipation (T = +70C) EE A Supply Voltage (V to V ) .............................................. +12V 16-Pin Thin QFN (derate 16.9mW/C above +70C) ....1349mW CC EE REFVOUT ....................................................(V - 0.3V) to +3.0V Operating Temperature Range ...........................-40C to +85C EE OSADJ, SCALE, REFISET ...........................(V - 0.3V) to +5.5V Junction Temperature .....................................................+150C EE REFIIN, LOGIIN ........................................(V - 0.3V) to V Storage Temperature Range .............................-65C to +150C EE CMVIN LOGV1, LOGV2, CMVOUT, Lead Temperature (soldering, 10s) .................................+300C REFIOUT ......................................(V - 0.3V) to (V + 0.3V) EE CC 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 CharacteristicsSingle-Supply Operation (V = +5V, V = GND = 0V, I = 1A, I = 10A, LOGV2 = SCALE, LOGV1 = OSADJ, CMVIN = CMVOUT, R > 1M , CC EE REF LOG SET T = -40C to +85C. Typical values are at T = +25C, unless otherwise noted.) (Note 1) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V (Note 2) 2.7 11.0 V CC T = +25C 3.9 5 A Supply Current I mA CC T = -40C to +85C 7 A Minimum 10 nA LO GIIN C ur r ent Range ( N otes 3, 4) I LOG Maximum 1 mA Minimum 10 nA RE FIIN C ur r ent Range ( N otes 3, 4) I REF Maximum 1 mA Common-Mode Voltage V 480 500 520 mV CMVOUT Common-Mode Voltage Input V 0.5 1.0 V CMVIN Range I = 10nA, REF T = +25C 2 5 A I = 10nA to 1mA, LOG Log Conformity Error V mV LC K = 0.25V/decade T = -40C to +85C 10 A (Note 4) T = +25C 237.5 250 262.5 A mV/ Logarithmic Slope (Scale Factor) K decade T = -40C to +85C (Note 4) 231.25 268.75 A V/ Logarithmic Slope (Scale Factor) T = -40C to +85C 80 d ecade/ A Temperature Drift C T = +25C, V - V , A CMVIN REFIIN Input Offset Voltage V 15 mV IO V - V CMVIN LOGIIN Input Offset Voltage Temperature V V - V , V - V 6 V/C IOS CMVIN REFIIN CMVIN LOGIIN Drift T = +25C 1.218 1.238 1.258 A Voltage Reference Output V V REFVOUT T = -40C to +85C (Note 4) 1.195 1.275 A V ol tage R efer ence Out p ut Cur r ent I 1mA REFVOUT T = +25C 490 500 510 A C ur r ent Referen ce Out p ut Vol ta g eV mV REFISET T = -40C to +85C (Note 4) 482 518 A www.maximintegrated.com Maxim Integrated 2