Page 1
16 V, 4 MHz Rail-to-Rail
Preliminary Technical Data
FEATURES
Lower price version of AD8661/AD8662/AD8664
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: 10 nV/√Hz
Wide bandwidth: 4 MHz
Rail-to-rail output
Unity gain stable
MSL 1 rating
Lead-free packaging
APPLICATIONS
Sensor amplification
Reference buffers
Medical equipment
Physiological measurements
Signal filters and conditioning
Consumer audio
Photodiode amplification
GENERAL DESCRIPTION
The AD8665 is a rail-to-rail output single supply 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 precision, choose the AD8661 (single).
The combination of offsets, very low input bias currents and
wide supply range make these amplifiers useful in a wide variety
of cost-sensitive applications normally associated with much
higher priced JFET amplifiers. Systems utilizing high
impedance sensors, such as photo diodes benefit from the
Output Amplifier
AD8665
ADC driver
Level shifting circuits
PIN CONFIGURATIONS
1
1
OUT
OUT
AD8665
AD8665
2
2
TOP VIEW
TOP VIEW
V-
V-
(Not to Scale)
(Not to Scale)
3
3
+IN
+IN
NC = NO CONNECT
NC = NO CONNECT
Figure 1. AD8665, 5-Lead SOT (RJ-5)
1
1
NC
NC
AD8665
AD8665
2
2
-IN
-IN
3
3
TOP VIEW
TOP VIEW
+IN
+IN
(Not to Scale)
(Not to Scale)
4
4
V-
V-
NC = NO CONNECT
NC = NO CONNECT
Figure 2. AD8665, SOIC (R-8)
combination of low input bias current, low noise, and low offset
and bandwidth. The wide operating voltage range matches
today’s 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 AD8665 is specified over the extended industrial (−40° to
+125°C) temperature range.
5
5
V+
V+
3
3
-IN
-IN
NC
8
NC
8
7
7
V+
V+
OUT
6
OUT
6
NC
5
NC
5
Rev. PrA
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.
Page 2
AD8665 Preliminary Technical Data
TABLE OF CONTENTS
Features.............................................................................................. 1
Thermal Resistance.......................................................................5
Applications....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
REVISION HISTORY
5/06—Rev 0: Initial Version
ESD Caution...................................................................................5
Typical Performance Characteristics........ Error! Bookmark not
defined.
Outline Dimensions.................... Error! Bookmark not defined.
Ordering Guide ....................... Error! Bookmark not defined.
Rev. PrA | Page 2 of 6
Page 3
Preliminary Technical Data AD8665
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
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 +3.0 V 84 100 dB
−40°C < TA < +125°C 80 dB
Large-Signal Voltage Gain AVO R
OUTPUT CHARACTERISTICS
Output Voltage High V
OH
−40°C < TA < +125°C 4.86 V
Output Voltage Low V
OL
−40°C < TA < +125°C 105 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 ISY 1.1 1.4 mA
-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 2.4 μV p-p
Voltage Noise Density e
n
f = 10 kHz 10 nV/√Hz
Channel Separation CS f = 10 kHz −115 dB
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
= 2 kΩ, VO = 0.5 V to 4.5 V 68 145 V/mV
L
I
= 1 mA 4.88 4.93 V
OUT
I
= 1 mA 50 70 mV
OUT
±19 mA
At 1MHz, AV = 1 50 Ω
70 Degrees
f = 1 kHz 12 nV/√Hz
Rev. PrA | Page 3 of 6
Page 4
AD8665 Preliminary Technical Data
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 90 105 dB
−40°C < TA < +125°C 80 dB
Large-Signal Voltage Gain AVO R
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 ISY 1.15 1.55 mA
−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 10 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
= 2 kΩ, VO = 0.5 V to 15.5 V 130 255 V/mV
L
I
= 1 mA 15.94 15.96 V
OUT
I
= 1 mA 22 36 mV
OUT
±140 mA
At 1MHz, AV = 1 50 Ω
73 Degrees
f = 1 kHz 12 nV/√Hz
Rev. PrA | Page 4 of 6
Page 5
Preliminary Technical Data AD8665
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 Range (Soldering, 60 sec) 300°C
Junction Temperature 150°C
DD
ESD CAUTION
ESD (electrostatic discharge)
sensitive device. Electrostatic
charges as high as 4000 V readily
accumulate on the human body and
test equipment and can discharge
without detection. Although this
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
Table 4. Thermal Resistance
Package Type θJA θ
8-Lead SOIC_N (R-8) 158 43 °C/W
5-Lead SOT (J-8) °C/W
product features proprietary ESD
protection circuitry, permanent
damage may occur on devices
subjected to high energy
electrostatic discharges. Therefore,
proper ESD precautions are
recommended to avoid performance
degradation or loss of functionality.
Unit
JC
Rev. PrA | Page 5 of 6
Page 6
AD8665 Preliminary Technical Data
PR06195-0-6/06(PrA)
NOTES
Rev. PrA | Page 6 of 6
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