ANALOG DEVICES AD8665, AD8666, AD8668 Service Manual
16 V, 4 MHz Rail-to-Rail
O
www.BDTIC.com/ADI
FEATURES
Offset voltage: 2.5 mV max
Low input bias current: 1 pA max
Single-supply operation: 5 V to 16 V
Dual-supply operation: ±2.5 V to ±8 V
Low noise: 8 nV/√Hz @ 10 kHz
Wide bandwidth: 4 MHz
Rail-to-rail output
Unity-gain stable
Lead-free packaging
APPLICATIONS
Sensor amplification
Reference buffers
Medical equipment
Physiological measurements
Signal filters and conditioning
Consumer audio
Photodiode amplification
ADC driver
Level shifting circuits
GENERAL DESCRIPTION
The AD866x family are single supply, rail-to-rail output
amplifiers with low noise performance featuring an extended
operating range with supply voltages up to 16 V. They also
feature low input bias currents, wide signal bandwidth, and low
input voltage and current noise. For lower offset voltage, choose
the
AD8661/AD8662/AD8664 family.
The combination of low offsets, very low input bias currents,
nd wide supply range make these amplifiers useful in a wide
a
variety of cost sensitive applications normally associated with
much higher priced JFET amplifiers. Systems using high
impedance sensors, such as photo diodes, benefit from the
combination of low input bias current, low noise, and low offset
and bandwidth. The wide operating voltage range matches high
performance ADCs and DACs. Audio applications and medical
monitoring equipment can take advantage of the high input
impedance, low voltage and current noise, wide bandwidth, and
the lack of popcorn noise found in many other low input bias
current amplifiers.
The AD866x family is specified over the extended industrial
t
emperature range (−40°C to +125°C).
Output Amplifiers
AD8665/AD8666/AD8668
PIN CONFIGURATIONS
1
OUT
V–
+IN
AD8665
TOP VIEW
2
(Not to Scale)
3
Figure 1. AD8665, 5-Lead SOT-23 (RJ-5)
NC
1
AD8665
2
–IN
+IN
3
TOP VIEW
(Not to Scale)
VEE
4
NC = NO CONNECT
Figure 2. AD8665, 8-Lead SOIC_N (R-8)
OUT A
1
AD8666
2
–IN A
+IN A
3
TOP VIEW
(Not to Scale)
V–
4
Figure 3. AD8666, 8-Lead SOIC_N (R-8)
1
UT A
2
–IN A
+IN A
V–
AD8666
3
TOP VIEW
(Not to Scale)
4
Figure 4. AD8666, 8-Lead MSOP (RM-8)
1
OUT A
2
IN A
3
+IN A
V+
+IN B
–IN B
OUT B
AD8668
TOP VIEW
4
(Not to Scale)
5
6
7
Figure 5. AD8668, 14-Lead TSSOP (RU-14)
1
OUT A
OUT A
2
–IN A
3
+IN A
+INB +INC
–IN B
OUT B
V+
AD8648
AD8668
AD8648
AD8668
4
TOP VIEW
TOP VIEW
TOP VIEW
TOP VIEW
(Not to Scale)
(Not to Scale)
(Not to Scale)
(Not to Scale)
5
6
7
Figure 6. AD8668, 14-Lead SOIC_N (R-14)
5
4
14
13
12
11
10
8
7
6
5
8
7
6
5
8
7
6
5
14
13
12
11
10
9
8
9
8
V+
–IN
NC
VCC
OUT
NC
V+
OUT B
–IN B
+IN B
V+
OUT B
–IN B
+IN B
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
OUT D
–IN D
+IN D
V–
–IN C
OUT C
06195-039
6195-040
06018-001
06195-002
06195-003
06195-004
Rev. A
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.
AD8665/AD8666/AD8668
www.BDTIC.com/ADI
TABLE OF CONTENTS
Features .............................................................................................. 1
Absolute Maximum Ratings ............................................................5
Applications....................................................................................... 1
General Description......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
REVISION HISTORY
10/06—Rev. 0 to Rev. A
Added AD8665 ...................................................................Universal
Added New Figure 1 and Figure 2,
Re
numbered Sequentially................................................................ 1
Changes to Table 4............................................................................ 5
Changes to Figure 8, Figure 9, and Figure 11 ............................... 6
Change to Figure 40 ....................................................................... 11
Updated Outline Dimensions....................................................... 12
Changes to Ordering Guide.......................................................... 13
4/06—Rev 0: Initial Version
Thermal Resistance .......................................................................5
ESD Caution...................................................................................5
Typical Perf or m an c e Charac t e r istics ..............................................6
Outline Dimensions ....................................................................... 12
Ordering Guide .......................................................................... 13
Rev. A | Page 2 of 16
AD8665/AD8666/AD8668
www.BDTIC.com/ADI
SPECIFICATIONS
VDD = 5.0 V, VCM = VDD/2, TA = 25oC, unless otherwise noted.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
V
−40°C < TA < +125°C 5.0 mV
Offset Voltage Drift ΔVOS/ΔT −40°C < TA < +125°C 3.0 10 μV/°C
Input Bias Current I
−40°C < TA < +125°C 550 pA
Input Offset Current I
−40°C < TA < +125°C 70 pA
Input Voltage Range V
Common-Mode Rejection Ratio CMRR VCM = −0.1 V to +3.0 V 84 100 dB
−40°C < TA < +125°C 79 dB
Large-Signal Voltage Gain A
OUTPUT CHARACTERISTICS
Output Voltage High V
−40°C < TA < +125°C 4.86 V
Output Voltage Low V
−40°C < TA < +125°C 105 mV
Short-Circuit Output Current I
Closed-Loop Output Impedance Z
POWER SUPPLY
Power Supply Rejection Ratio PSRR VDD = 5.0 V to 16 V 98 115 dB
−40°C < TA < +125°C 94 dB
Supply Current per Amplifier I
−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 Φ
NOISE PERFORMANCE
Peak-to-Peak Noise en p-p 0.1 Hz to 10 Hz 2.4 μV p-p
Voltage Noise Density e
f = 10 kHz 8 nV/√Hz
Channel Separation CS f = 10 kHz −115 dB
OS
B
OS
CM
VO
OH
OL
SC
OUT
SY
M
n
VCM = 2.5 V 0.7 2.5 mV
= −0.1 V to +3.0 V 3.0 mV
CM
0.2 1 pA
0.1 0.5 pA
−0.1 +3.0 V
RL = 2 kΩ, VO = 0.5 V to 4.5 V 68 145 V/mV
I
= 1 mA 4.88 4.93 V
OUT
I
= 1 mA 50 85 mV
OUT
±19 mA
At 1 MHz, AV = 1 50 Ω
1.1 1.4 mA
70 Degrees
f = 1 kHz 10 nV/√Hz
Rev. A | Page 3 of 16
AD8665/AD8666/AD8668
www.BDTIC.com/ADI
VDD = 16 V, VCM = VDD/2, TA = 25oC, unless otherwise noted.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
OS
V
−40°C < TA < +125°C 5.0 mV
Offset Voltage Drift ΔVOS/ΔT −40°C < TA < +125°C 3.0 10 μV/°C
Input Bias Current I
B
−40°C < TA < +125°C 550 pA
Input Offset Current I
OS
−40°C < TA < +125°C 70 pA
Input Voltage Range V
CM
Common-Mode Rejection Ratio CMRR VCM = −0.1 V to +14.0 V 90 110 dB
−40°C < TA < +125°C 80 dB
Large-Signal Voltage Gain A
VO
OUTPUT CHARACTERISTICS
Output Voltage High V
OH
−40°C < TA < +125°C 15.90 V
Output Voltage Low V
OL
−40°C < TA < +125°C 50 mV
Short-Circuit Output Current I
Closed-Loop Output Impedance Z
SC
OUT
POWER SUPPLY
Power Supply Rejection Ratio PSRR VDD = 5.0 V to 16 V 98 115 dB
−40°C < TA < +125°C 94 dB
Supply Current per Amplifier I
SY
−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 Φ
M
NOISE PERFORMANCE
Peak-to-Peak Noise en p-p 0.1 Hz to 10 Hz 2.5 μV p-p
Voltage Noise Density e
n
f = 10 kHz 8 nV/√Hz
Channel Separation CS f = 10 kHz −115 dB
VCM = 8 V 0.6 2.5 mV
= −0.1 V to +14.0 V 3.0 mV
CM
0.2 1 pA
0.1 0.5 pA
−0.1 +14.0 V
RL = 2 kΩ, VO = 0.5 V to 15.5 V 130 255 V/mV
I
= 1 mA 15.94 15.96 V
OUT
I
= 1 mA 22 40 mV
OUT
±140 mA
At 1 MHz, AV = 1 50 Ω
1.15 1.55 mA
73 Degrees
f = 1 kHz 10 nV/√Hz
Rev. A | Page 4 of 16
AD8665/AD8666/AD8668
www.BDTIC.com/ADI
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Rating
Supply Voltage 18 V
Input Voltage GND to V
Differential Input Voltage ±18 V
Output Short-Circuit to GND Indefinite
Storage Temperature Range −65°C to +150°C
Operating Temperature Range −40°C to +125°C
Lead Temperature (Soldering, 60 sec) 300°C
Junction Temperature 150°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.
DD
THERMAL RESISTANCE
Table 4. Thermal Resistance
Package Type θ
5-Lead SOT-23 (RJ-5) 240 92 °C/W
8-Lead SOIC_N (R-8) 158 43 °C/W
8-Lead MSOP (RM-8) 210 45 °C/W
14-Lead SOIC (R-14) 120 36 °C/W
14-Lead TSSOP (RU-14) 180 35 °C/W
JA
θ
JC
Unit
ESD CAUTION
Rev. A | Page 5 of 16
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