20 A Maximum, Rail-to-Rail I/O, Zero Input Crossover Distortion Amplifiers Data Sheet AD8505/AD8506/AD8508 FEATURES PIN CONFIGURATIONS PSRR: 100 dB minimum BALL A1 INDICATOR CMRR: 105 dB typical OUT V+ Very low supply current: 20 A per amplifier maximum A1 A2 1.8 V to 5 V single supply or 0.9 V to 2.5 V dual supply V NC Rail-to-rail input/output B1 B2 Low noise: 45 nV/Hz at 1 kHz +IN IN 2.5 mV offset voltage maximum C1 C2 Very low input bias current: 1 pA typical OUT 1 5 V+ AD8505 APPLICATIONS AD8505 V 2 TOP VIEW TOP VIEW (Not to Scale) Pressure and position sensors (BALL SIDE DOWN) +IN 3 4 IN Not to Scale Remote security NC = NO CONNECT Bio sensors Figure 1. 5-Lead SOT-23 (RJ-5) Figure 2. 6-Ball WLCSP (CB-6-7) IR thermometers BALL A1 Battery-powered consumer equipment CORNER Hazard detectors OUT B V+ OUT A GENERAL DESCRIPTION A1 A2 A3 The AD8505/AD8506/AD8508 are single, dual, and quad micro- IN B IN A B1 B3 power amplifiers featuring rail-to-rail input/output swings while operating from a single 1.8 V to 5 V power supply or from dual +IN B V +IN A C1 C2 C3 0.9 V to 2.5 V power supplies. Using a new circuit technology, OUT A 1 8 V+ these amplifiers offer zero input crossover distortion (excellent AD8506 IN A 2 7 OUT B AD8506 PSRR and CMRR performance) and low bias current while TOP VIEW +IN A 3 6 IN B (Not to Scale) TOP VIEW operating with a supply current of less than 20 A per amplifier. (BALL SIDE DOWN) V 4 5 +IN B Not to Scale This amplifier family offers the lowest noise in its power class. Figure 3. 8-Lead MSOP (RM-8) Figure 4. 8-Ball WLCSP (CB-8-2) This combination of features makes the AD8505/AD8506/AD8508 BALL A1 amplifiers ideal choices for battery-powered applications because CORNER OUTD OUTA INA they minimize errors due to power supply voltage variations over A1 A2 A3 the lifetime of the battery and maintain high CMRR even for a rail- IND V +INA to-rail input op amp. Remote battery-powered sensors, handheld B1 B2 B3 +IND +INB instrumentation, consumer equipment, hazard detection (for OUT A 1 14 OUT D C1 C3 example, smoke, fire, and gas), and patient monitors can benefit IN A 2 13 IN D +INC V+ INB from the features of the AD8505/AD8506/AD8508 amplifiers. D1 D2 D3 +IN A 3 12 +IN D AD8508 INC OUTC OUTB V+ 4 TOP VIEW 11 V The AD8505/AD8506/AD8508 are specified for both the industrial E1 E2 E3 (Not to Scale) +IN B 5 10 +IN C temperature range of 40C to +85C and the extended industrial IN B 6 9 IN C AD8508 temperature range of 40C to +125C. The AD8505 single ampli- TOP VIEW OUT B 7 8 OUT C (BALL SIDE DOWN) Not to Scale fier is available in a tiny 5-lead SOT-23 and a 6-ball WLCSP Figure 5. 14-Lead TSSOP (RU-14) Figure 6. 14-Ball WLCSP (CB-14-1) packages. The AD8506 dual amplifier is available in 8-lead MSOP and 8-ball WLCSP packages. The AD8508 quad amplifier is available in 14-lead TSSOP and 14-ball WLCSP packages. The AD8505/AD8506/AD8508 are members of a growing series of zero crossover distortion op amps offered by Analog Devices, Inc., including the ADA4505-1/ADA4505-2/ADA4505-4, that operate from a single 1.8 V to 5 V supply or from dual 0.9 V to 2.5 V power supplies. Rev. F Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20072017 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 06900-051 06900-002 06900-045 06900-100 06900-001 06900-104Data Sheet AD8505/AD8506/AD8508 TABLE OF CONTENTS Features .............................................................................................. 1 ESD Caution...................................................................................6 Applications ....................................................................................... 1 Typical Performance Characteristics ..............................................7 General Description ......................................................................... 1 Theory of Operation ...................................................................... 14 Pin Configurations ........................................................................... 1 Applications Information .............................................................. 16 Revision History ............................................................................... 3 Pulse Oximeter Current Source ............................................... 16 Specifications ..................................................................................... 4 Four-Pole, Low-Pass Butterworth Filter for Glucose Monitor ....................................................................................................... 17 Electrical Characteristics1.8 V Operation ............................ 4 Outline Dimensions ....................................................................... 18 Electrical Characteristics5 V Operation................................ 5 Ordering Guide .......................................................................... 21 Absolute Maximum Ratings ............................................................ 6 Thermal Resistance ...................................................................... 6 Rev. F Page 2 of 21