ANALOG DEVICES AD8661 Service Manual
Low Noise, Precision 16 V CMOS,
O
www.BDTIC.com/ADI
FEATURES
Low offset voltage: 100 μV maximum @ VS = 5 V
Low input bias current: 1 pA maximum
Single-supply operation: 5 V to 16 V
Low noise: 10 nV/√Hz
Wide bandwidth: 4 MHz
Unity-gain stable
Small package options
3 mm × 3 mm 8-lead LFCSP
8-lead MSOP and narrow SOIC
14-lead TSSOP and narrow SOIC
APPLICATIONS
Sensors
Medical equipment
Consumer audio
Photodiode amplification
ADC drivers
Rail-to-Rail Operational Amplifiers
AD8661/AD8662/AD8664
PIN CONFIGURATIONS
1
NC
AD8661
–IN
2
TOP VIEW
3
+IN
(Not to Scale)
V–
4
NC = NO CONNECT
Figure 1. AD8661, 8-Lead SOIC_N
1
OUT A
–IN A
+IN A
V–
AD8662
2
TOP VIEW
3
(Not to Scale)
4
Figure 3. AD8662, 8-Lead SOIC_N
1
OUT A
–IN A
2
AD8664
3
+IN A
+IN B
–IN B
OUT B
V+
TOP VIEW
(Not to Scale)
4
5
6
7
(R-8)
(R-8)
8
7
6
5
14
13
12
11
10
8
7
6
5
9
8
NC
V+
OUT
NC
V+
OUT B
–IN B
+IN B
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
1NC
AD8661
2–IN
3+IN
05200-002
4V–
NC = NO CONNECT
Figure 2. AD8661, 8-Lead LFCSP_VD
(CP-8-
OUT A
1
AD8662
2
–IN A
+IN A
05200-001
V–
TOP VIEW
3
(Not to Scale)
4
Figure 4. AD8662, 8-Lead MSOP
(RM-8)
1
OUT A
–IN A
2
V+
AD8664
3
TOP VIEW
(Not to Scale)
4
5
6
7
+IN A
+IN B
–IN B
UT B
8NC
7V+
6OUT
5NC
05200-035
2)
V+
8
7
OUT B
–IN B
6
5
+IN B
OUT D
14
–IN D
13
+IN D
12
V–
11
10
+IN C
9
–IN C
8
OUT C
05200-004
GENERAL DESCRIPTION
The AD8661/AD8662/AD8664 are rail-to-rail output, singlesupply amplifiers that use the Analog Devices, Inc., patented
DigiTrim® trimming technique to achieve low offset voltage.
The AD866x series features extended operating ranges, with
supply voltages up to 16 V. It also features low input bias
current, wide signal bandwidth, and low input voltage and
current noise.
The combination of low offset, very low input bias current, and
ide supply range makes these amplifiers useful in a wide
a w
variety of applications usually associated with higher priced
JFET amplifiers. Systems using high impedance sensors, such as
photodiodes, benefit from the combination of low input bias
current, low noise, low offset, and wide bandwidth. The wide
operating voltage range meets the demands of high
performance ADCs and DACs. Audio applications and medical
05200-036
Figure 5. AD8664, 14-Lead SOIC_N
-14)
(R
Figure 6. AD8664, 14-Lead TSSOP
(RU-14)
monitoring equipment can take advantage of the high input
impedance, low voltage and current noise, and wide bandwidth.
The single AD8661 is available in a narrow 8-lead SOIC
p
ackage and a very thin, dual lead, 8-lead LFCSP. The AD8661
SOIC_N package is specified over the extended industrial
temperature range of −40°C to +125°C. The AD8661
LFCSP_VD is specified over the industrial temperature range
of −40°C to +85°C. The AD8662 is available in a narrow 8-lead
SOIC package and an 8-lead MSOP, both specified over the
extended industrial temperature range of −40°C to +125°C. The
AD8664 is available in a narrow 14-lead SOIC package and a
14-lead TSSOP, both with an extended industrial temperature
range of −40°C to +125°C.
05200-037
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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 ©2006 Analog Devices, Inc. All rights reserved.
AD8661/AD8662/AD8664
www.BDTIC.com/ADI
TABLE OF CONTENTS
Features.............................................................................................. 1
AD8661 Electrical Characteristics—LFCSP_VD Only............5
Applications....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
AD8661/AD8662/AD8664 Electrical Characteristics—
SOIC_N, MSOP, and TSSOP ...................................................... 3
AD8661/AD8662/AD8664 Electrical Characteristics—
SOIC_N, MSOP, and TSSOP ...................................................... 4
REVISION HISTORY
7/06—Rev. C to Rev. D
Added AD8664 ...................................................................Universal
Added 14-Lead SOIC_N and 14-Lead TSSOP ...............Universal
Changes to Features.......................................................................... 1
Changes to Table 1............................................................................ 3
Changes to Table 2............................................................................ 4
Changes to Table 3............................................................................ 5
Changes to Table 4............................................................................ 6
Changes to Table 5 and Table 6....................................................... 7
Changes to Figure 29...................................................................... 11
Updated Outline Dimensions....................................................... 13
Changes to Ordering Guide.......................................................... 15
5/06—Rev. B to Rev. C
hanges to Ordering Guide.......................................................... 13
C
3/06—Rev. A to Rev. B
A
dded AD8662 ...................................................................Universal
Added MSOP ......................................................................Universal
AD8661 Electrical Characteristics—LFCSP_VD Only............6
Absolute Maximum Ratings ............................................................7
Thermal Resistance.......................................................................7
ESD Caution...................................................................................7
Typical Performance Characteristics..............................................8
Outline Dimensions....................................................................... 13
Ordering Guide .......................................................................... 15
Changes to Table 1.............................................................................3
C
hanges to Table 2.............................................................................4
Changes to Table 3.............................................................................5
Changes to Table 4.............................................................................6
Changes to Table 5.............................................................................7
Updated Outline Dimensions....................................................... 13
Changes to Ordering Guide.......................................................... 13
1/06—Rev. 0 to Rev. A
dded LFCSP_VD .............................................................Universal
A
Changes to Table 1.............................................................................3
Changes to Table 2.............................................................................4
Changes to Ordering Guide.......................................................... 13
9/05—Revision 0: Initial Version
Rev. D | Page 2 of 16
AD8661/AD8662/AD8664
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SPECIFICATIONS
AD8661/AD8662/AD8664 ELECTRICAL CHARACTERISTICS—SOIC_N, MSOP, AND TSSOP
VS = 5.0 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS V
AD8661 −40°C < TA < +85°C 1000 μV
AD8661 −40°C < TA < +125°C 1400 μV
AD8662 −40°C < TA < +125°C 1000 μV
AD8664 −40°C < TA < +125°C 1200 μV
Input Bias Current IB 0.3 1 pA
−40°C < TA < +85°C 50 pA
−40°C < TA < +125°C 300 pA
Input Offset Current IOS 0.2 0.5 pA
−40°C < TA < +85°C 20 pA
−40°C < TA < +125°C 75 pA
Input Voltage Range −0.1 +3.0 V
Common-Mode Rejection Ratio CMRR VCM = −0.1 V to +3.0 V 85 100 dB
−40°C < TA < +125°C 80 100 dB
Large Signal Voltage Gain AVO R
Offset Voltage Drift TCVOS
AD8661 −40°C < TA < +125°C 3 10 μV/°C
AD8662, AD8664 −40°C < TA < +125°C 2 9 μV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH I
−40°C < TA < +125°C 4.80 V
Output Voltage Low VOL I
−40°C < TA < +125°C 110 mV
Short-Circuit Current ISC ±19 mA
Closed-Loop Output Impedance Z
POWER SUPPLY
Supply Current per Amplifier ISY V
−40°C < TA < +125°C 2.0 mA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ 3.5 V/μs
Gain Bandwidth Product GBP 4 MHz
Phase Margin ΦO 65 Degrees
NOISE PERFORMANCE
Peak-to-Peak Noise en p-p f = 0.1 Hz to 10 Hz 2.5 μV p-p
Voltage Noise Density e
f = 10 kHz 10 nV/√Hz
Current Noise Density i
f = 1 MHz, AV = 1 50 Ω
OUT
n
n
= VS/2 30 100 μV
CM
= 2 kΩ, VO = 0.5 V to 4.5 V 100 220 V/mV
L
= 1 mA 4.85 4.93 V
L
= 1 mA 50 100 mV
L
= VS/2 1.15 1.40 mA
O
f = 1 kHz 12 nV/√Hz
f = 1 kHz 0.1 pA/√Hz
Rev. D | Page 3 of 16
AD8661/AD8662/AD8664
www.BDTIC.com/ADI
AD8661/AD8662/AD8664 ELECTRICAL CHARACTERISTICS—SOIC_N, MSOP, AND TSSOP
VS = 16.0 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS V
AD8661 −40°C < TA < +85°C 1000 μV
AD8661 −40°C < TA < +125°C 1400 μV
AD8662 −40°C < TA < +125°C 1000 μV
AD8664 −40°C < TA < +125°C 1200 μV
Input Bias Current IB 0.3 1 pA
−40°C < TA < +85°C 50 pA
−40°C < TA < +125°C 300 pA
Input Offset Current IOS 0.2 0.5 pA
−40°C < TA < +85°C 20 pA
−40°C < TA < +125°C 75 pA
Input Voltage Range −0.1 +14.0 V
Common-Mode Rejection Ratio CMRR VCM = −0.1 V to +14.0 V 90 110 dB
−40°C < TA < +125°C 90 110 dB
Large Signal Voltage Gain AVO R
Offset Voltage Drift TCVOS
AD8661 −40°C < TA < +125°C 3 10 μV/°C
AD8662, AD8664 −40°C < TA < +125°C 2 9 μV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH I
I
−40°C < TA < +125°C 15.50 V
Output Voltage Low VOL I
I
−40°C < TA < +125°C 350 mV
Short-Circuit Current ISC ±140 mA
Closed-Loop Output Impedance Z
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 5 V to 16 V 95 110 dB
−40°C < TA < +125°C 95 115 dB
Supply Current per Amplifier ISY V
−40°C < TA < +125°C 2.1 mA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ 3.5 V/μs
Gain Bandwidth Product GBP 4 MHz
Phase Margin ΦO 65 Degrees
NOISE PERFORMANCE
Peak-to-Peak Noise en p-p f = 0.1 Hz to 10 Hz 2.5 μV p-p
Voltage Noise Density e
f = 10 kHz 10 nV/√Hz
Current Noise Density i
f = 1 MHz, AV = 1 45 Ω
OUT
n
n
= VS/2 50 160 μV
CM
= 2 kΩ, VO = 0.5 V to 15.5 V 200 360 V/mV
L
= 1 mA 15.93 15.97 V
L
= 10 mA 15.60 15.70 V
L
= 1 mA 24 50 mV
L
= 10 mA 190 300 mV
L
= VS/2 1.25 1.55 mA
O
f = 1 kHz 12 nV/√Hz
f = 1 kHz 0.1 pA/√Hz
Rev. D | Page 4 of 16
AD8661/AD8662/AD8664
www.BDTIC.com/ADI
AD8661 ELECTRICAL CHARACTERISTICS—LFCSP_VD ONLY
VS = 5.0 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 3.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS V
−40°C < TA < +85°C 2000 μV
Input Bias Current IB 0.3 1 pA
−40°C < TA < +85°C 50 pA
Input Offset Current IOS 0.2 0.5 pA
−40°C < TA < +85°C 20 pA
Input Voltage Range −0.1 +3.0 V
Common-Mode Rejection Ratio CMRR VCM = −0.1 V to +3.0 V 85 100 dB
−40°C < TA < +85°C 80 100 dB
Large Signal Voltage Gain AVO R
Offset Voltage Drift TCVOS −40°C < TA < +85°C 4 17 μV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH I
−40°C < TA < +85°C 4.80 V
Output Voltage Low VOL I
−40°C < TA < +85°C 120 mV
Short-Circuit Current ISC ±19 mA
Closed-Loop Output Impedance Z
POWER SUPPLY
Supply Current per Amplifier ISY V
−40°C < TA < +85°C 1.8 mA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ 3.5 V/μs
Gain Bandwidth Product GBP 4 MHz
Phase Margin ΦO 65 Degrees
NOISE PERFORMANCE
Peak-to-Peak Noise en p-p f = 0.1 Hz to 10 Hz 2.5 μV p-p
Voltage Noise Density e
f = 10 kHz 10 nV/√Hz
Current Noise Density i
f = 1 MHz, AV = 1 65 Ω
OUT
n
n
= VS/2 50 300 μV
CM
= 2 kΩ, VO = 0.5 V to 4.5 V 100 240 V/mV
L
= 1 mA 4.85 4.93 V
L
= 1 mA 50 100 mV
L
= VS/2 1.15 1.40 mA
O
f = 1 kHz 12 nV/√Hz
f = 1 kHz 0.1 pA/√Hz
Rev. D | Page 5 of 16
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