Low Cost, Low Noise, CMOS Rail-to-Rail Output Operational Amplifiers AD8691/AD8692/AD8694
FEATURES
Offset voltage: 400 μV typical Low offset voltage drift: 6 μV/°C maximum (AD8692/AD8694) Very low input bias currents: 1 pA maximum Low noise: 8 nV/√Hz Low distortion: 0.0006% Wide bandwidth: 10 MHz Unity-gain stable Single-supply operation: 2.7 V to 6 V
PIN CONFIGURATIONS
OUT 1 V– 2 +IN 3
AD8691
TOP VIEW (Not to Scale)
5
V+
4
–IN
Figure 1. 5-Lead TSOT
OUT A 1 V– 2 +IN A 3
4
AD8691
5
V+
APPLICATIONS
Photodiode amplification Battery-powered instrumentation Medical instruments Multipole filters Sensors Portable audio devices
–IN
Figure 2. 5-Lead SC70
OUT A 1 –IN A 2 +IN A 3 V– 4
8
AD8692
TOP VIEW (Not to Scale)
V+ OUT B +IN B
04991-001
04991-033
04991-032
7 6 5
–IN B
Figure 3. 8-Lead MSOP
OUT A 1 –IN A 2 +IN A 3
8
GENERAL DESCRIPTION
The AD8691, AD8692, and AD8694 are low cost, single, dual, and quad rail-to-rail output, single-supply amplifiers featuring low offset and input voltages, low current noise, and wide signal bandwidth. The combination of low offset, low noise, very low input bias currents, and high speed make these amplifiers useful in a wide variety of applications. Filters, integrators, photodiode amplifiers, and high impedance sensors all benefit from this combination of performance features. Audio and other ac applications benefit from the wide bandwidth and low distortion of these devices. Applications for these amplifiers include power amplifier (PA) controls, laser diode control loops, portable and loop-powered instrumentation, audio amplification for portable devices, and ASIC input and output amplifiers. The small SC70 and TSOT package options for the AD8691 allow it to be placed next to sensors, thereby reducing external noise pickup. The AD8691, AD8692, and AD8694 are specified over the extended industrial temperature range of −40°C to +125°C. The AD8691 single is available in 5-lead SC70 and 5-lead TSOT packages. The AD8692 dual is available in 8-lead MSOP and narrow SOIC surface-mount packages. The AD8694 quad is available in 14-lead TSSOP and narrow 14-lead SOIC packages.
V+ OUT B
04991-002
AD8692
7
6 –IN B TOP VIEW (Not to Scale) V– 4 5 +IN B
Figure 4. 8-Lead SOIC
OUT A 1 –IN A 2 +IN A 3 V+ 4
14 OUT D 13 –IN D
AD8694
12 +IN D
TOP VIEW 11 V– (Not to Scale) 10 +IN C +IN B 5 –IN B 6 OUT B 7
9 8
–IN C OUT C
Figure 5. 14-Lead SOIC
OUT A –IN A +IN A V+ +IN B –IN B OUT B
1 2 3 4 5 6 7 14 13
OUT D –IN D +IN D V– +IN C –IN C OUT C
AD8694
TOP VIEW (Not to Scale)
12 11 10 9 8
Figure 6. 14-Lead TSSOP
Rev. C
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 ©2004–2007 Analog Devices, Inc. All rights reserved.
04991-031
04991-030
AD8691/AD8692/AD8694 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Pin Configurations ........................................................................... 1 Revision History ............................................................................... 2 Electrical Characteristics ................................................................. 3 Absolute Maximum Ratings ............................................................5 Thermal Characteristics ...............................................................5 ESD Caution...................................................................................5 Typical Performance Characteristics ..............................................6 Outline Dimensions ....................................................................... 11 Ordering Guide .......................................................................... 12
REVISION HISTORY
5/07—Rev. B to Rev. C Change to Figure 1 ........................................................................... 1 Changes to Large Signal Voltage Gain Values in Table 1 ............ 3 Change to Phase Margin Symbol in Table 1 ................................. 3 Change to TA Value for Table 2 ...................................................... 4 Changes to Large Signal Voltage Gain Values in Table 2 ............ 4 Change to Phase Margin Symbol in Table 2 ................................. 4 Changes to Table 4............................................................................ 5 Changes to Outline Dimensions................................................... 11 Changes to Ordering Guide .......................................................... 12 3/05—Rev. A to Rev. B Added AD8694 ...................................................................Universal 1/05—Rev. 0 to Rev. A Added AD8691 ...................................................................Universal Changes to Features.......................................................................... 1 Added Figure 1 and Figure 2........................................................... 1 Changes to Electrical Characteristics ............................................ 3 Changes to Figure 6 caption............................................................ 6 Changes to Figure 9.......................................................................... 6 Updated Outline Dimensions ....................................................... 11 Changes to Ordering Guide .......................................................... 11 10/04—Revision 0: Initial Version
Rev. C | Page 2 of 12
AD8691/AD8692/AD8694 ELECTRICAL CHARACTERISTICS
VS = 2.7 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 1.
Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol VOS IB −40°C < TA < +85°C −40°C < TA < +125°C Input Offset Current IOS −40°C < TA < +85°C −40°C < TA < +125°C Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain AD8691/AD8692 AD8694 Offset Voltage Drift AD8691 AD8692/AD8694 INPUT CAPACITANCE Common-Mode Input Capacitance Differential Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High Output Voltage Low Short-Circuit Current Closed-Loop Output Impedance POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time Gain Bandwidth Product Phase Margin Total Harmonic Distortion + Noise NOISE PERFORMANCE Voltage Noise Voltage Noise Density Current Noise Density CMRR AVO RL = 2 kΩ, VO = 0.5 V to 2.2 V RL = 2 kΩ, VO = 0.5 V to 2.2 V ∆VOS/∆T 2 1.3 CCM CDM VOH VOL ISC ZOUT PSRR ISY I L = 1 mA −40°C < TA < +125°C IL = 1 mA −40°C < TA < +125°C f = 1 MHz, AV = 1 VS = 2.7 V to 5.5 V −40°C < TA < +125°C VO = 0 V −40°C < TA < +125°C RL = 2 kΩ To 0.01% 80 75 2.64 2.6 5 2.5 2.66 25 ±20 12 95 95 0.85 40 60 12 6 μV/°C μV/°C pF pF V V mV mV mA Ω dB dB mA mA V/μs μs MHz Degrees % 3.0 12 μV p-p nV/√Hz nV/√Hz pA/√Hz 90 60 250 V/mV V/mV VCM = −0.3 V to +1.6 V VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C −0.3 68 60 90 85 0.1 Conditions VCM = −0.3 V to +1.6 V VCM = −0.1 V to +1.6 V; −40°C < TA < +125°C Min Typ 0.4 0.2 Max 2.0 3.0 1 50 260 0.5 20 75 +1.6 Unit mV mV pA pA pA pA pA pA V dB dB
0.95 1.2
SR tS GBP Øm THD + N en p-p en en in
G = 1, RL = 600 Ω, f = 1 kHz, VO = 250 mV p-p f = 0.1 Hz to 10 Hz f = 1 kHz f = 10 kHz f = 1 kHz
5 1 10 60 0.003 1.6 8 6.5 0.05
Rev. C | Page 3 of 12
AD8691/AD8692/AD8694
VS = 5.0 V, VCM = VS/2, TA = 25°C, unless otherwise noted. Table 2.
Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol VOS IB −40°C < TA < +85°C −40°C < TA < +125°C Input Offset Current IOS −40°C < TA < +85°C −40°C < TA < +125°C Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain AD8691/AD8692 AD8694 Offset Voltage Drift AD8691 AD8692/AD8694 INPUT CAPACITANCE Common-Mode Input Capacitance Differential Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High CMRR AVO VO = 0.5 V to 4.5 V, RL = 2 kΩ, VCM = 0 V VO = 0.5 V to 4.5 V, RL = 2 kΩ, VCM = 0 V ∆VOS/∆T 2 1.3 CCM CDM VOH I L = 1 mA IL = 10 mA −40°C to +125°C IL = 1 mA IL = 10 mA IL = 10 mA −40°C to +125°C −40°C to +125°C f = 1 MHz, AV = 1 VS = 2.7 V to 5.5 V −40°C < TA < +125°C VO = 0 V −40°C < TA < +125°C RL = 2 kΩ To 0.01%
