AD8675ARMZ

PIN CONFIGURATIONS Very low voltage noise: 2.8 nV/√Hz Rail-to-rail output swing Low input bias current: 2 nA maximum Very low offset voltage: 75 µV maximum Low input offset drift: 0.6 µV/°C maximum Very high gain: 120 dB Wide bandwidth: 10 MHz typical ±5 V to ±18 V operation NULL 1 –IN 2 +IN 3 V– 4 AD8675 8 NULL 7 V+ 6 OUT TOP VIEW (Not to Scale) 5 NC 05564-001 FEATURES NC = NO CONNECT Figure 1. 8-Lead SOIC_N (R-8) NULL 1 APPLICATIONS Precision instrumentation PLL filters Laser diode control loops Strain gage amplifiers Medical instrumentation Thermocouple amplifiers 8 NULL –IN 2 AD8675 7 V+ +IN 3 TOP VIEW (Not to Scale) 6 OUT 5 NC V– 4 NC = NO CONNECT 05564-002 Data Sheet 36 V Precision, 2.8 nV/√Hz Rail-to-Rail Output Op Amp AD8675 Figure 2. 8-Lead MSOP (RM-8) GENERAL DESCRIPTION The AD8675 precision operational amplifier has ultralow offset, drift, and voltage noise combined with very low input bias currents over the full operating temperature range. The AD8675 is a precision, wide bandwidth op amp featuring rail-to-rail output swings and very low noise. Operation is fully specified from ±5 V to ±15 V. take advantage of the low noise, dc precision, and rail-to-rail output swing provided by the AD8675 to maximize SNR and dynamic range. The AD8675 features a rail-to-rail output like that of the OP184, but with wide bandwidth and even lower voltage noise, combined with the precision and low power consumption like that of the industry-standard OP07 amplifier. Unlike other low noise, railto-rail op amps, the AD8675 has very low input bias current and low input current noise. The AD8675 is specified for the extended industrial temperature range (−40°C to +125°C). The AD8675 amplifier is available in the tiny 8-lead MSOP, and the popular 8-lead, narrow SOIC, RoHS compliant packages. MSOP packaged devices are only available in tape and reel format. With typical offset voltage of only 10 µV, offset drift of 0.2 µV/°C, and noise of only 0.10 μV p-p (0.1 Hz to 10 Hz), the AD8675 is perfectly suited for applications where large error sources cannot be tolerated. For applications with even lower offset tolerances, the proprietary nulling capability allows a combination of both device and system offset errors up to 3.5 mV (referred to the input) to be compensated externally. Unlike previous circuits, the AD8675 accommodates this adjustment without adversely affecting the offset drift, CMRR, and PSRR of the amplifier. Precision instrumentation, PLL, and other precision filter circuits, position and pressure sensors, medical instrumentation, and strain gage amplifiers benefit greatly from the very low noise, low input bias current, and wide bandwidth. Many systems can The smaller packages and low power consumption afforded by the AD8675 allow maximum channel density or minimum board size for space-critical equipment. For the dual version of this ultraprecision, rail-to-rail op amp, see the AD8676 data sheet. The AD8675 and AD8676 are members of a growing series of low noise op amps offered by Analog Devices, Inc. Table 1. Voltage Noise Package Single Dual Quad 0.9 nV AD797 1.1 nV AD8597 AD8599 1.8 nV ADA4004-1 ADA4004-2 ADA4004-4 2.8 nV AD8675 AD8676 3.8 nV AD8671 AD8672 AD8674 Rev. E 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 rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2005–2012 Analog Devices, Inc. All rights reserved. AD8675 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Thermal Resistance .......................................................................5 Applications ....................................................................................... 1 Power Sequencing .........................................................................5 Pin Configurations ........................................................................... 1 ESD Caution...................................................................................5 General Description ......................................................................... 1 Typical Performance Characteristics ..............................................6 Revision History ............................................................................... 2 Test Circuit ...................................................................................... 11 Specifications..................................................................................... 3 Outline Dimensions ....................................................................... 12 Electrical Specifications ............................................................... 3 Ordering Guide .......................................................................... 12 Absolute Maximum Ratings ............................................................ 5 REVISION HISTORY 7/12—Rev. D to Rev. E Added Power Sequencing Section .................................................. 5 Added Figure 28 and Figure 29; Renumbered Sequentially ..... 10 8/11—Rev. C to Rev. D Added Input Capacitance, Common Mode Parameter and Input Capacitance, Differential Mode Parameter, Table 3..................... 4 6/10—Rev. B to Rev. C Changes to Figure 10 ........................................................................ 7 5/10—Rev. A to Rev. B Changes to General Description Section ...................................... 1 Added Table 1; Renumbered Sequentially .................................... 1 Changes to Table 2 ............................................................................ 3 Changes to Table 3 ............................................................................ 4 Changes to Table 4 and Table 5 ....................................................... 5 Changes to Figure 4 and Figure 6 to Figure 8 ............................... 6 Changes to Figure 15 ........................................................................ 8 Changes to Figure 21 and Figure 24............................................... 9 Added Figure 27; Renumbered Sequentially .............................. 10 Updated Outline Dimensions ....................................................... 12 Changes to Ordering Guide .......................................................... 12 4/07—Rev. 0 to Rev. A Added Figure 7 and Figure 8; Renumbered Sequentially ........... 6 10/05—Revision 0: Initial Version Rev. E | Page 2 of 12 Data Sheet AD8675 SPECIFICATIONS ELECTRICAL SPECIFICATIONS VS = ±5.0 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified. Table 2. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Symbol Test Conditions/Comments VOS ΔVOS/ΔT IB −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C Input Offset Current IOS Input Voltage Range Common-Mode Rejection Ratio IVR CMRR Open-Loop Gain AVO −40°C ≤ TA ≤ +125°C OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Limit POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product NOISE PERFORMANCE Voltage Noise Voltage Noise Density Current Noise Density Min VOH VOL VCM = −3.0 V to +3.0 V −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground, VO = −3.5 V to +3.5 V −40°C ≤ TA ≤ +125°C RL = 10 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 10 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C −2 −5.5 −1 −2.8 −3.0 105 105 120 ISY Max Unit 10 12 0.2 +0.5 −2 +0.1 +0.1 75 240 0.6 +2 +5.5 +1 +2.8 +3.0 µV µV µV/°C nA nA nA nA V dB dB dB 130 126 117 4.90 4.85 4.80 4.75 dB 4.95 4.90 −4.98 −4.91 ISC PSRR Typ −4.90 −4.85 −4.86 −4.82 ±35 VS = ±5.0 V to ±15.0 V −40°C ≤ TA ≤ +125°C VO = 0 V −40°C ≤ TA ≤ +125°C 120 120 140 2.3 2.7 3.4 V V V V V V V V mA dB dB mA mA SR GBP RL = 2 kΩ 2.5 10 V/µs MHz en p-p en in 0.1 Hz to 10 Hz f = 1 kHz f = 10 Hz 0.1 2.8 0.3 µV p-p nV/√Hz pA/√Hz Rev. E | Page 3 of 12 AD8675 Data Sheet VS = ±15 V, VCM = 0 V, VO = 0 V, TA = +25°C, unless otherwise specified. Table 3. Parameter INPUT CHARACTERISTICS Offset Voltage Offset Voltage Drift Input Bias Current Symbol Test Conditions/Comments VOS ΔVOS/ΔT IB −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C −40°C ≤ TA ≤ +125°C Input Offset Current IOS Input Voltage Range Common-Mode Rejection Ratio IVR CMRR Open-Loop Gain AVO −40°C ≤ TA ≤ +125°C Input Capacitance, Common Mode Input Capacitance, Differential Mode OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Limit POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product NOISE PERFORMANCE Voltage Noise Voltage Noise Density Current Noise Density Min VCM = −12.5 V to +12.5 V −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground, VO = −13.5 V to +13.5 V −40°C ≤ TA ≤ +125°C −2 −4.5 −1 −2.8 −12.5 114 114 123 VOL RL = 10 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 10 kΩ to ground −40°C ≤ TA ≤ +125°C RL = 2 kΩ to ground −40°C ≤ TA ≤ +125°C 14.85 14.80 14.60 14.40 ISY Unit 10 12 0.2 +0.5 +1 +0.1 +0.1 75 240 0.6 +2 +4.5 +1 +2.8 +12.5 132 µV µV µV/°C nA nA nA nA V dB dB dB 3.8 9.6 dB pF pF 130 14.92 14.80 −14.96 −14.85 ISC PSRR Max 117 CINCM CINDM VOH Typ −14.94 −14.90 −14.75 −14.69 ±35 VS = ±5.0 V to ±15.0 V −40°C ≤ TA ≤ +125°C VO = 0 V −40°C ≤ TA ≤ +125°C 120 120 140 2.5 2.9 3.8 V V V V V V V V mA dB dB mA mA SR GBP RL = 10 kΩ 2.5 10 V/µs MHz en p-p en in 0.1 Hz to 10 Hz f = 1 kHz f = 10 Hz 0.1 2.8 0.3 µV p-p nV/√Hz pA/√Hz Rev. E | Page 4 of 12 Data Sheet AD8675 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 4. Parameter Supply Voltage Input Voltage Input Current Differential Input Voltage Output Short-Circuit Duration to GND Storage Temperature Range RM-8, R-8 Packages Operating Temperature Range Junction Temperature Range RM-8, R-8 Packages Lead Temperature Range (Soldering, 10 sec) NULL Pins (Pin 1, Pin 8), Input Current Maximum θJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages and measured using a standard 4-layer board, unless otherwise specified. Rating ±18 V ±V supply ±5 mA ±0.7 V Indefinite Table 5. Thermal Resistance −65°C to +150°C −40°C to +125°C −65°C to +150°C 300°C