AD8548ACPZ-R7

22 μA, RRIO, CMOS, 18 V Operational Amplifier AD8546/AD8548 Data Sheet FEATURES PIN CONFIGURATIONS OUT A 1 –IN B 6 9 –IN C APPLICATIONS OUT B 7 8 OUT C Portable medical equipment Remote sensors Transimpedance amplifiers Current monitors 4 mA to 20 mA loop drivers Buffer/level shifting Figure 2. AD8548 (14-Lead SOIC_N) –IN A 2 AD8546 +IN A 3 TOP VIEW (Not to Scale) V– 4 8 V+ 7 OUT B 6 –IN B 5 +IN B 09585-001 Micropower at high voltage (18 V): 22 μA maximum Low input bias current: 20 pA maximum Gain bandwidth product: 240 kHz at AV =100 typical Unity-gain crossover: 240 kHz −3 dB closed-loop bandwidth: 310 kHz Slew rate: 80 V/ms Large signal voltage gain: 110 dB minimum Single-supply operation: 2.7 V to 18 V Dual-supply operation: ±1.35 V to ±9 V Unity-gain stable Excellent electromagnetic interference immunity Figure 1. AD8546 (8-Lead MSOP) OUT A 1 14 OUT D –IN A 2 13 –IN D 12 +IN D +IN A 3 AD8548 11 V– TOP VIEW +IN B 5 (Not to Scale) 10 +IN C 09585-103 V+ 4 GENERAL DESCRIPTION The AD8546 and AD8548 are dual and quad micropower, high input impedance amplifiers optimized for low power and wide operating supply voltage range applications. The AD8546/AD8548 rail-to-rail input/output (RRIO) feature provides increased dynamic range to drive low frequency data converters, making these amplifiers ideal for dc gain and buffering of sensor front ends or high impedance input sources used in wireless or remote sensors or transmitters. The AD8546/ AD8548 also have high immunity to electromagnetic interference. The low supply current specification (22 μA) of the AD8546/ AD8548 over a wide operating voltage range of 2.7 V to 18 V or dual supplies (±1.35 V to ±9 V) makes these amplifiers useful for a variety of battery-powered, portable applications, such as ECGs, pulse monitors, glucose meters, smoke and fire detectors, vibration monitors, and backup battery sensors. The AD8546/AD8548 are specified over the extended industrial temperature range of −40°C to +125°C. The AD8546 is available in an 8-lead MSOP package; the AD8548 is available in a 14-lead SOIC_N package. Rev. C Table 1. Micropower Op Amps (> RSENSE, the current through the load resistor at the receiver side is almost equivalent to ISENSE. VIN = 100mVPEAK VSY = 2.7V TO 18V 100M 1G 10G FREQUENCY (Hz) 09585-100 20 10M VOUT RNULL 1MΩ 1% R1 68kΩ 1% 140 40 ADR125 VREF 09585-072 Note that 100 kΩ resistors are used in series with the input of the op amp. If smaller resistor values are used, the supply current of the system increases much more. For more information about using op amps as comparators, see the AN-849 Application Note, Using Op Amps as Comparators. Figure 70. EMIRR vs. Frequency 4 mA TO 20 mA PROCESS CONTROL CURRENT LOOP TRANSMITTER A 2-wire current transmitter is often used in distributed control systems and process control applications to transmit analog signals between sensors and process controllers. Figure 71 shows a 4 mA to 20 mA current loop transmitter. Figure 71 shows a design for a full-scale input voltage of 5 V. At 0 V of input, the loop current is 3.5 mA, and at a full-scale input of 5 V, the loop current is 21 mA. This allows software calibration to fine-tune the current loop to the 4 mA to 20 mA range. Together, the AD8546 and the ADR125 consume quiescent current of only 160 µA, making 3.34 mA current available to power additional signal conditioning circuitry or to power a bridge circuit. Rev. C | Page 20 of 24 Data Sheet AD8546/AD8548 OUTLINE DIMENSIONS 3.20 3.00 2.80 8 3.20 3.00 2.80 1 5.15 4.90 4.65 5 4 PIN 1 IDENTIFIER 0.65 BSC 0.95 0.85 0.75 15° MAX 1.10 MAX 0.40 0.25 6° 0° 0.80 0.55 0.40 0.23 0.09 10-07-2009-B 0.15 0.05 COPLANARITY 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 72. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters 8.75 (0.3445) 8.55 (0.3366) 8 14 1 7 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0039) COPLANARITY 0.10 0.51 (0.0201) 0.31 (0.0122) 6.20 (0.2441) 5.80 (0.2283) 0.50 (0.0197) 0.25 (0.0098) 1.75 (0.0689) 1.35 (0.0531) SEATING PLANE 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) COMPLIANT TO JEDEC STANDARDS MS-012-AB CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. 060606-A 4.00 (0.1575) 3.80 (0.1496) Figure 73. 14-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-14) Dimensions shown in millimeters and (inches) ORDERING GUIDE Model1 AD8546ARMZ AD8546ARMZ-RL AD8546ARMZ-R7 AD8548ARZ AD8548ARZ-RL AD8548ARZ-R7 1 Temperature Range −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C −40°C to +125°C Package Description 8-Lead Mini Small Outline Package [MSOP] 8-Lead Mini Small Outline Package [MSOP] 8-Lead Mini Small Outline Package [MSOP] 14-Lead Standard Small Outline Package [SOIC_N] 14-Lead Standard Small Outline Package [SOIC_N] 14-Lead Standard Small Outline Package [SOIC_N] Z = RoHS Compliant Part. Rev. C | Page 21 of 24 Package Option RM-8 RM-8 RM-8 R-14 R-14 R-14 Branding A2V A2V A2V AD8546/AD8548 Data Sheet NOTES Rev. C | Page 22 of 24 Data Sheet AD8546/AD8548 NOTES Rev. C | Page 23 of 24 AD8546/AD8548 Data Sheet NOTES ©2011–2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09585-0-9/12(C) Rev. C | Page 24 of 24