ANALOG DEVICES AD8663 Service Manual
Low Noise, Precision, 16 V, CMOS,
–
FEATURES
Low offset voltage: 175 µV maximum @ VSY = 5 V
Low supply current: 275 A maximum per amplifier
Single-supply operation: 5 V to 16 V
Low noise: 23 nV/√Hz
Low input bias current: 300 fA
Unity-gain stable
Small packages available
3 mm × 3 mm, 8-lead LFCSP
8-lead MSOP
Other packages
8-lead SOIC
14-lead SOIC
14-lead TSSOP
APPLICATIONS
Sensor front ends
Transimpedance amplifiers
Electrometer applications
Photodiode amplification
Low power ADC drivers
Medical diagnostic instruments
pH and ORP meters and probes
DAC or REF buffers
Rail-to-Rail Operational Amplifiers
AD8663/AD8667/AD8669
PIN CONFIGURATIONS
1NC
NC
1
AD8663
IN
2
TOP VIEW
+IN
3
(Not to Scale)
4
V–
NC = NO CONNECT
NC
8
V+
7
OUT
6
5
NC
06742-001
AD8663
2–IN
3+IN
4V–
NC = NO CONNECT
Figure 1. 8-Lead SOIC (R-8) Figure 2. 8-Lead LFCSP (CP-8-2)
OUT A
1
1
2
2
OUT A
–IN A
+IN A
V–
1
AD8667
2
TOP VIEW
3
(Not to Scale)
4
8
7
6
5
Figure 3. 8-Lead MSOP (RM-8),
8-Lead SOIC (R-8)
V+
OUT B
–IN B
+IN B
–IN A
+IN A
3
3
AD8648
AD8669
TOP VIEW
TOP VIEW
V+
4
4
(Not to Scale)
(Not to Scale)
5
5 10
+IN B
06742-003
–IN B
6
6 9
7
7 8
OUT B
Figure 4. 14-Lead SOIC (R-14),
14-Lead TSSOP (RU-14)
8NC
7V+
6OUT
5NC
OUT D
14
14
13
13
–IN D
+IN D
12
12
V–
11
11
10
+IN C
–IN C
9
8
OUT C
06742-002
6742-004
GENERAL DESCRIPTION
The AD866x are rail-to-rail output amplifiers that use the
Analog Devices, Inc., patented DigiTrim® trimming technique
to achieve low offset voltage. The AD866x feature an extended
operating range with supply voltages up to 16 V. They also
feature low input bias current, low input offset voltage, and
low current noise.
The combination of low offset, very low input bias current, and
a wide supply range makes these amplifiers useful in a wide 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 ability to operate the device for single (5 V to 16 V) or dual
supplies (±2.5 V to ±8 V) supports many applications. The railto-rail outputs provide increased dynamic range to drive low
Rev. B
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.
frequency data converters. The low bias current drift is wellsuited for precision I-to-V converters. The combination of
precision offset, offset drift, and low noise also make the op
amps ideal for gain, dc offset adjust, and active filter in both
instrumentation and medical applications. These low power
op amps can be used in IR thermometers, pH and ORP instruments, pressure transducer front ends, and other sensor signal
conditioning circuits that are used in remote or wireless
applications.
The AD8663/AD8667/AD8669 are specified over the extended
industrial temperature range of −40°C to +125°C. The single
AD8663 is available in a narrow 8-lead SOIC package and a ver y
thin, 8-lead LFCSP. The dual AD8667 is available in a narrow
8-lead SOIC package and an 8-lead MSOP. The quad AD8669
is available in a 14-lead SOIC and 14-lead small TSSOP.
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 ©2007–2008 Analog Devices, Inc. All rights reserved.
AD8663/AD8667/AD8669
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Electrical Characteristics ............................................................. 3
REVISION HISTORY
1/08—Rev. A to Rev. B
Added TSSOP ..................................................................... Universal
Change to Table 4 ............................................................................. 5
Changes to Figure 8 and Figure 9 ................................................... 6
Changes to Figure 23 and Figure 26 ............................................... 9
Updated Outline Dimensions ....................................................... 13
Changes to Ordering Guide .......................................................... 15
10/07—Rev. 0 to Rev. A
Added AD8667 and AD8669 ............................................ Universal
Changes to Features .......................................................................... 1
Changes to General Description .................................................... 1
Inserted Figure 3 and Figure 4 ........................................................ 1
Changes to Table 1, Power Supply Section .................................... 3
Changes to Table 2 ............................................................................ 4
Reformatted Typical Performance Characteristics Section ........ 6
Changes to Figure 5 .......................................................................... 6
Changes to Figure 13 ........................................................................ 7
Changes to Figure 17 and Figure 20 ............................................... 8
Inserted Figure 35 Through Figure 39 ......................................... 11
Inserted Figure 40 and Figure 41 .................................................. 12
Updated Outline Dimensions ....................................................... 13
Changes to Ordering Guide .......................................................... 15
7/07—Revision 0: Initial Version
Absolute Maximum Ratings ............................................................5
Thermal Resistance .......................................................................5
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 15
Rev. B | Page 2 of 16
AD8663/AD8667/AD8669
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
VSY = 5.0 V, VCM = VSY/2, TA = 25°C, unless otherwise noted.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS V
−40°C < TA < +125°C 450 µV
Input Bias Current IB 0.3 pA
−40°C < TA < +85°C 45 pA
−40°C < TA < +125°C 105 pA
Input Offset Current IOS 0.2 pA
−40°C < TA < +85°C 35 pA
−40°C < TA < +125°C 65 pA
Input Voltage Range 0.2 3.0 V
Common-Mode Rejection Ratio CMRR VCM = 0.2 V to 3.0 V 76 100 dB
−40°C < TA < +125°C 76 100 dB
Large Signal Voltage Gain AVO R
R
Offset Voltage Drift TCVOS −40°C < TA < +125°C 1.5 5 µV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH I
−40°C < TA < +125°C 4.90 V
Output Voltage High VOH I
−40°C < TA < +125°C 4.60 V
Output Voltage Low VOL I
−40°C < TA < +125°C 35 mV
Output Voltage Low VOL I
−40°C < TA < +125°C 250 mV
Short-Circuit Current ISC ±7 mA
Closed-Loop Output Impedance Z
f = 100 kHz, AV = 1 120 Ω
OUT
POWER SUPPLY
Power Supply Rejection Ratio PSRR VSY = 5 V to 16 V 95 105 dB
−40°C < TA < +125°C 95 dB
Supply Current per Amplifier ISY V
−40°C < TA < +125°C 325 A
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ 0.26 V/µs
Gain Bandwidth Product GBP CL = 20 pF 520 kHz
Phase Margin ΦM C
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
n
f = 10 kHz 21 nV/√Hz
Current Noise Density in f = 1 kHz 0.05 pA/√Hz
= VSY/2 30 175 µV
CM
= 100 kΩ, V
L
= 2 kΩ, V
L
= 100 µA 4.95 4.97 V
L
= 1 mA 4.65 4.80 V
L
= 100 µA 17 25 mV
L
= 1 mA 150 200 mV
L
= VSY/2 210 275 A
OUT
= 20 pF 60 Degrees
L
= 0.5 V to 4.5 V 115 140 dB
OUT
= 0.5 V to 4.5 V 106 114 dB
OUT
f = 1 kHz 23 nV/√Hz
Rev. B | Page 3 of 16
AD8663/AD8667/AD8669
VSY = 16.0 V, VCM = VSY/2, TA = 25°C, unless otherwise noted.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS V
−40°C < TA < +125°C 500 µV
Input Bias Current IB 0.3 pA
−40°C < TA < +85°C 45 pA
−40°C < TA < +125°C 120 pA
Input Offset Current IOS 0.2 pA
−40°C < TA < +85°C 35 pA
−40°C < TA < +125°C 65 pA
Input Voltage Range 0.2 14.5 V
Common-Mode Rejection Ratio CMRR VCM = 0.2 V to 14.5 V 87 109 dB
−40°C < TA < +125°C 87 109 dB
Large Signal Voltage Gain AVO R
R
Offset Voltage Drift TCVOS −40°C < TA < +125°C 1.5 5 µV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH I
−40°C < TA < +125°C 15.90 V
Output Voltage High VOH I
−40°C < TA < +125°C 15.80 V
Output Voltage Low VOL I
−40°C < TA < +125°C 35 mV
Output Voltage Low VOL I
−40°C < TA < +125°C 125 mV
Short-Circuit Current ISC ±50 mA
Closed-Loop Output Impedance Z
f = 100 kHz, AV = 1 100 Ω
OUT
POWER SUPPLY
Power Supply Rejection Ratio PSRR VSY = 5 V to 16 V 95 105 dB
−40°C < TA < +125°C 95 dB
Supply Current per Amplifier ISY V
−40°C < TA < +125°C 355 A
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ 0.3 V/µs
Gain Bandwidth Product GBP CL = 20 pF 540 kHz
Phase Margin ΦM C
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
n
f = 10 kHz 21 nV/√Hz
Current Noise Density in f = 1 kHz 0.05 pA/√Hz
= VSY/2 40 300 µV
CM
= 100 kΩ, V
L
= 2 kΩ, V
L
= 100 A 15.95 15.98 V
L
= 1 mA 15.85 15.92 V
L
= 100 A 17 25 mV
L
= 1 mA 70 100 mV
L
= VSY/2 230 285 A
OUT
= 20 pF 64 Degrees
L
= 0.5 V to 15.5 V 115 140 dB
OUT
= 0.5 V to 15.5 V 106 111 dB
OUT
f = 1 kHz 23 nV/√Hz
Rev. B | Page 4 of 16
AD8663/AD8667/AD8669
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Rating
Supply Voltage 18 V
Input Voltage −0.1 V to VSY
Differential Input Voltage 18 V
Output Short-Circuit Duration to GND Indefinite
Storage Temperature Range −60°C to +150°C
Operating Temperature Range −40°C to +125°C
Junction Temperature Range −65°C to +150°C
Lead Temperature, Soldering (60 sec) 300°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 4. Thermal Resistance
Package Type θJA θ
8-Lead SOIC (R-8) 121 43 °C/W
8-Lead LFCSP (CP-8-2) 751 181 °C/W
8-Lead MSOP (RM-8) 145 45 °C/W
14-Lead SOIC (R-14) 90 45 °C/W
14-Lead TSSOP (RU-14) 180 35 °C/W
1
Exposed pad soldered to application board.
Unit
JC
ESD CAUTION
Rev. B | Page 5 of 16
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