MAX4465MAX4469 19-1950 Rev 1 4/01 Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown General Description Features The MAX4465MAX4469 are micropower op amps opti- +2.4V to +5.5V Supply Voltage Operation mized for use as microphone preamplifiers. They pro- Versions with 5nA Complete Shutdown Available vide the ideal combination of an optimized gain (MAX4467/MAX4468) bandwidth product vs. supply current, and low voltage operation in ultra-small packages. The MAX4465/ Excellent Power-Supply Rejection Ratio: 112dB MAX4467/MAX4469 are unity-gain stable and deliver a Excellent Common-Mode Rejection Ratio: 126dB 200kHz gain bandwidth from only 24A of supply cur- rent. The MAX4466/MAX4468 are decompensated for a High A : 125dB (R = 100k ) VOL L minimum stable gain of +5V/V and provide a 600kHz Rail-to-Rail Outputs gain bandwidth product. In addition, these amplifiers feature Rail-to-Rail outputs, high A plus excellent VOL, Low 24A Quiescent Supply Current power-supply rejection and common-mode rejection ratios for operation in noisy environments. Gain Bandwidth Product: 200kHz (MAX4465/MAX4467/MAX4469) The MAX4467/MAX4468 include a complete shutdown 600kHz A 5 (MAX4466/MAX4468) mode. In shutdown, the amplifiers supply current is V reduced to 5nA and the bias current to the external Available in Space-Saving Packages microphone is cut off for ultimate power savings. The 5-Pin SC70 (MAX4465/MAX4466) single MAX4465/MAX4466 are offered in the ultra-small 8-Pin SOT23 (MAX4467/MAX4468/MAX4469) 5-pin SC70 package, while the single with shutdown MAX4467/MAX4468 and dual MAX4469 are available in Ordering Information the space-saving 8-pin SOT23 package. PART TEMP. RANGE PIN-PACKAGE MAX4465EXK-T -40C to +85C 5 SC70-5 Applications MAX4465EUK-T -40C to +85C 5 SOT23-5 Microphone Preamplifiers MAX4466EXK-T -40C to +85C 5 SC70-5 Hearing Aids MAX4466EUK-T -40C to +85C 5 SOT23-5 Cellular Phones Ordering Information continued at end of data sheet. Voice-Recognition Systems Typical Operating Circuit Digital Dictation Devices Headsets Portable Computing V CC Pin Configurations SHDN R BIAS MIC BIAS TOP VIEW C BIAS R DC IN+ 1 5 V CC R IN+ BIAS OUT MAX4465 CIN RIN GND 2 MAX4466 IN- MAX4467 MAX4468 C BYPASS IN- 3 4 OUT R DC GND SC70/SOT23 MICROPHONE CAPSULE Pin Configurations continued at end of data sheet. R FB MAX4467/MAX4468 TYPICAL OPERATING CIRCUIT WITH COMPLETE SHUTDOWN Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete Shutdown ABSOLUTE MAXIMUM RATINGS Supply Voltage (V to GND)................................................+6V 8-Pin SOT23 (derate 5.3mW/C above +70C) ...........421mW CC All Other Pins to GND.................................-0.3V to (V + 0.3V) 8-Pin SO (derate 5.88mW/C above +70C) ...............471mW CC Output Short-Circuit Duration Operating Temperature Range ...........................-40C to +85C OUT Shorted to GND or V .................................Continuous Storage Temperature Range .............................-65C to +150C CC Continuous Power Dissipation (T = +70C) Junction Temperature......................................................+150C A 5-Pin SC70 (derate 2.5mW/C above +70C) .............200mW Lead Temperature (soldering, 10s) .................................+300C 5-Pin SOT23 (derate 7.1mW/C above +70C) ...........571mW 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. ELECTRICAL CHARACTERISTICS (V = +5V, V = 0, V = V /2, R = to V /2, SHDN = GND (MAX4467/MAX4468 only). T = T to T , unless otherwise CC CM OUT CC L CC A MIN MAX noted. Typical values specified at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V Inferred from PSRR test 2.4 5.5 V CC Supply Current T = +25C2448 A I A CC (Per Amplifier) T = T to T 60 A MIN MAX Supply Current in Shutdown I SHDN = V (Note 2) 5 50 nA SHDN CC Input Offset Voltage V 1 5mV OS Input Bias Current I V = -0.1V 2.5 100 nA B CM Input Offset Current Range I V = -0.1V 1 15 nA OS CM Input Common-Mode Range V Inferred from CMRR test -0.1 V - 0.1 V CM CC C omm on- M od e Rejec ti on Ratio CMRR -0.1V V V - 1V 80 126 dB CM CC 2.4V V 5.5V 80 112 CC Power-Supply Rejection Ratio PSRR MAX4465/MAX4467/MAX4469, f = 3.4kHz 75 dB MAX4466/MAX4468, f = 3.4kHz 80 R = 100k to V /2, L CC 125 0.05V V V - 0.05V OUT CC Open-Loop Gain A dB VOL R = 10k to V /2, L CC 80 95 0.1V V V - 0.1V OUT CC R = 100k 10 L Output Voltage Swing High V V - V mV OH I CC OHI R = 10k 16 50 L R = 100k 10 L Output Voltage Swing Low V mV OL R = 10k 14 50 L Output Short-Circuit Current To either supply rail 15 mA Output Leakage Current SHDN = V , 0 V V CC OUT CC 0.5 100 nA in Shutdown (Notes 2, 3) SHDN Logic Low V (Note 2) V 0.3 V IL CC SHDN Logic High V (Note 2) V 0.7 V IH CC SHDN Input Current (Note 2) 2 25 nA MAX4465/MAX4467/MAX4469 200 Gain Bandwidth Product GBWP kHz MAX4466/MAX4468 600 2 MAX4465MAX4469