MAX9945 19-4398 Rev 1 12/10 38V, Low-Noise, MOS-Input, Low-Power Op Amp General Description Features The MAX9945 operational amplifier features an excellent +4.75V to +38V Single-Supply Voltage Range combination of low operating power and low input volt- 2.4V to 19V Dual-Supply Voltage Range age noise. In addition, MOS inputs enable the MAX9945 to feature low input bias currents and low input current Rail-to-Rail Output Voltage Swing noise. The device accepts a wide supply voltage range 400A Low Quiescent Current from 4.75V to 38V and draws a low 400A quiescent cur- rent. The MAX9945 is unity-gain stable and is capable of 50fA Low Input Bias Current rail-to-rail output voltage swing. 1fA/ Hz Low Input Current Noise The MAX9945 is ideal for portable medical and industri- 15nV/ Hz Low Noise al applications that require low noise analog front-ends for performance applications such as photodiode trans- 3MHz Unity-Gain Bandwidth impedance and chemical sensor interface circuits. Wide Temperature Range from -40C to +125C The MAX9945 is available in both an 8-pin MAX and a space-saving, 6-pin TDFN package, and is specified Available in Space-Saving, 6-Pin TDFN Package over the automotive operating temperature range (3mm x 3mm) (-40C to +125C). Applications Ordering Information Medical Pulse Oximetry PIN- TOP PART TEMP RANGE PACKAGE MARK Photodiode Sensor Interface MAX9945ATT+ -40C to +125C 6 TDFN-EP* AUE Industrial Sensors and Instrumentation MAX9945AUA+ -40C to +125C 8 MAX Chemical Sensor Interface +Denotes a lead(Pb)-free/RoHS-compliant package. High-Performance Audio Line Out *EP = Exposed pad. Active Filters and Signal Processing MAX is a registered trademark of Maxim Integrated Products, Inc. Typical Operating Circuit V CC PHOTODIODE IN- SIGNAL OUT CONDITIONING/ ADC MAX9945 FILTERS IN+ V EE Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.38V, Low-Noise, MOS-Input, Low-Power Op Amp ABSOLUTE MAXIMUM RATINGS Supply Voltage (V to V ) ..................................-0.3V to +40V 8-Pin MAX (derate 4.8mW/C above +70C) CC EE IN+, IN-, OUT Voltage......................(V - 0.3V) to (V + 0.3V) Multilayer Board ......................................................387.8mW EE CC IN+ to IN- .............................................................................12V Operating Temperature Range .........................-40C to +125C OUT Short Circuit to Ground Duration....................................10s Junction Temperature......................................................+150C Continuous Input Current into Any Pin .............................20mA Storage Temperature Range .............................-65C to +150C Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A 6-Pin TDFN-EP (derate 23.8mW/C above +70C) Soldering Temperature ....................................................+260C Multilayer Board ....................................................1904.8mW PACKAGE THERMAL CHARACTERISTICS (Note 1) TDFN-EP MAX Junction-to-Ambient Thermal Resistance ( ) ............42C/W Junction-to-Ambient Thermal Resistance ( ) .......206.3C/W JA JA Junction-to-Case Thermal Resistance ( ) ...................9C/W Junction-to-Case Thermal Resistance ...................42C/W JC JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four- layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. 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 = +15V, V = -15V, V = V = V = 0V, R = 100k to GND, T = -40C to +125C, typical values are at T = +25C, CC EE IN+ IN- GND OUT A A unless otherwise noted.) (Note 2) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ELECTRICAL CHARACTERISTICS V - CC T = +25C V A EE 1.2 Guaranteed by Input Voltage Range V , V V IN+ IN- CMRR V - CC T = T to T V A MIN MAX EE 1.4 T = +25C 0.6 5 A Input Offset Voltage V mV OS T = T to T 8 A MIN MAX Input Offset Voltage Drift V - T 2 V/C OS C -40C T +25C 50 150 fA A -40C T +70C 12 pA A Input Bias Current (Note 3) I B -40C T +85C 55 pA A -40C T +125C 1.9 nA A V = V to V - 1.2V, CM EE CC 78 94 T = +25C A Common-Mode Rejection Ratio CMRR dB V = V to V - 1.4V, CM EE CC 78 94 T = T to T A MIN MAX V + 0.3V V V - 0.3V, EE OUT CC 110 130 R = 100k to GND OUT Open-Loop Gain A dB OL V + 0.75V V V - 0.75V, EE OUT CC 110 130 R = 10k to GND OUT Output Short-Circuit Current I 25 mA SC 2 MAX9945