Precision, Low Noise, CMOS, Rail-to-Rail,
Input/Output Operational Amplifiers
Data Sheet
AD8605/AD8606/AD8608
Rev. L
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 ©2002–2012 Analog Devices, Inc. All rights reserved.
FEATURES
Low offset voltage: 65 µV maximum
Low input bias currents: 1 pA maximum
Low noise: 8 nV/√Hz
Wide bandwidth: 10 MHZ
High open-loop gain: 1000 V/mV
Unity gain stable
Single-supply operation: 2.7 V to 5.5 V
5-ball WLCSP for single (AD8605) and 8-ball WLCSP for
dual (AD8606)
APPLICATIONS
Photodiode amplification
Battery-powered instrumentation
Multipole filters
Sensors
Barcode scanners
Audio
GENERAL DESCRIPTION
The AD8605, AD8606, and AD86081 are single, dual, and quad
rail-to-rail input and output, single-supply amplifiers. They
feature very low offset voltage, low input voltage and current
noise, and wide signal bandwidth. They use the Analog Devices,
Inc. patented DigiTrim® trimming technique, which achieves
superior precision without laser trimming.
The combination of low offsets, low noise, very low input bias
currents, and high speed makes these amplifiers useful in a
wide variety of applications. Filters, integrators, photodiode
amplifiers, and high impedance sensors all benefit from the
combination of performance features. Audio and other ac
applications benefit from the wide bandwidth and low
distortion. Applications for these amplifiers include optical
control loops, portable and loop-powered instrumentation,
and audio amplification for portable devices.
The AD8605, AD8606, and AD8608 are specified over the
extended industrial temperature range (−40°C to +125°C). The
AD8605 single is available in 5-lead SOT-23 and 5-ball WLCSP
packages. The AD8606 dual is available in an 8-lead MSOP, an
8-ball WLSCP, and a narrow SOIC surface-mounted package.
The AD8608 quad is available in a 14-lead TSSOP package and
a narrow 14-lead SOIC package. The 5-ball and 8-ball WLCSP
offer the smallest available footprint for any surface-mounted
operational amplifier. The WLCSP, SOT-23, MSOP, and TSSOP
versions are available in tape-and-reel only.
1 Protected by U.S. Patent No. 5,969,657.
PIN CONFIGURATIONS
1
2
3
5
4–IN
+IN
V+
OUT
AD8605
TOP VIEW
(Not t o Scale)
V–
02731-001
02731-057
TOP VIEW
(BALL SIDE DOWN)
BALLA1
CORNER
A1 A2 A3
B1 B3
C1 C2 C3
AD8606
+INA V– +INB
–INA –INB
OUTA V+ OUTB
Figure 1. 5-Lead SOT-23 (RJ Suffix) Figure 2. 8-Ball WLCSP (CB Suffix)
AD8605 ONLY
OUT V+
V–
+IN –IN
1
3
5
4
2
TOP VIEW
(BUMP SIDE DOWN)
02731-006
–IN A
+IN A
V+
+IN B
–IN B
OUT B
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
OUT A
1
2
3
4
5
6
7
14
13
12
11
10
9
8
02731-004
AD8608
TOP VIEW
(Not t o Scale)
Figure 3. 5-Ball WLCSP (CB Suffix) Figure 4. 14-Lead SOIC_N (R Suffix)
–IN A
+IN A
V–
OUT B
–IN B
+IN B
V+
1 8
OUT A
4 5
02731-003
AD8606
TOP VIEW
(Not t o Scale)
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
–IN D
+IN D
V–
OUT D
–IN C
OUT C
+IN C
14
8
1
7
02731-002
AD8608
TOP VIEW
(Not t o Scale)
Figure 5. 8-Lead MSOP (RM Suffix),
8-Lead SOIC_N (R Suffix)
Figure 6. 14-Lead TSSOP (RU Suffix)
AD8605/AD8606/AD8608 Data Sheet
Rev. L | Page 2 of 24
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 3
5 V Electrical Specifications ............................................................ 4
2.7 V Electrical Specifications ......................................................... 6
Absolute Maximum Ratings ............................................................ 8
ESD Caution .................................................................................. 8
Typical Performance Characteristics ............................................. 9
Applications Information .............................................................. 16
Output Phase Reversal ............................................................... 16
Maximum Power Dissipation ................................................... 16
Input Overvoltage Protection ................................................... 16
THD + Noise ............................................................................... 16
Total Noise Including Source Resistors ................................... 17
Channel Separation .................................................................... 17
Capacitive Load Drive ............................................................... 17
Light Sensitivity .......................................................................... 18
WLCSP Assembly Considerations ........................................... 18
I-V Conversion Applications ........................................................ 19
Photodiode Preamplifier Applications .................................... 19
Audio and PDA Applications ................................................... 19
Instrumentation Amplifiers ...................................................... 20
DAC Conversion ........................................................................ 20
Outline Dimensions ....................................................................... 21
Ordering Guide .......................................................................... 24
Data Sheet AD8605/AD8606/AD8608
Rev. L | Page 3 of 24
REVISION HISTORY
2/12—Rev. K to Rev. L
Changed Functional Block Diagrams Section to Pin
Configuration Section ................................................................. 1
Changes to Figure 11 ................................................................... 9
Added Figure 33 ......................................................................... 13
8/11—Re v. J to Re v. K
Changes to Figure 20 ................................................................... 2
Updated Outline Dimensions ................................................... 20
Changes to Ordering Guide ...................................................... 23
8/10—Re v. I to Re v. J
Changes to Figure 10 and Figure 11 .......................................... 9
Changes to Figure 15 ................................................................. 10
Changes to Figure 36 ................................................................. 13
Changes to Figure 42 ................................................................. 14
Updated Outline Dimensions ................................................... 20
Changes to Ordering Guide ...................................................... 23
9/08—Rev. H to Rev. I
Changes to Input Overvoltage Protection Section ................ 15
Changes to Ordering Guide ...................................................... 22
2/08—Rev. G to Rev. H
Changes to Features ..................................................................... 1
Changes to Table 1 ....................................................................... 4
Changes to Table 2 ....................................................................... 6
Changes to Figure 11 ................................................................... 9
Changes to Figure 13, Figure 14, and Figure 16 Captions .... 10
Changes to Figure 15, Figure 17, and Figure 18 ..................... 10
Changes to Figure 34 and Figure 35 Captions ........................ 13
Changes to Figure 36 ................................................................. 13
Changes to Figure 37 Caption .................................................. 14
Changes to Figure 38 and Figure 41 ........................................ 14
Changes to Figure 45 ................................................................. 15
Changes to Audio and PDA Applications Section ................. 18
Changes to Figure 52 ................................................................. 18
Changes to Ordering Guide ...................................................... 22
10/07—Rev. F to Rev. G
Changes to Figure 2 ...................................................................... 1
Updated Outline Dimensions ................................................... 20
8/07—Rev. E to Re v. F
Added 8-Ball WLCSP Package ..................................... Universal
Changes to Features ..................................................................... 1
Changes to Table 1 ....................................................................... 3
Changes to Table 2 ....................................................................... 5
Changes to Table 4 ....................................................................... 7
Updated Outline Dimensions ................................................... 19
Changes to Ordering Guide ...................................................... 21
1/06—Re v. D to Rev. E
Changes to Table 1 ....................................................................... 3
Changes to Table 2 ....................................................................... 5
Changes to Table 4 ........................................................................ 6
Changes to Figure 12 Caption ..................................................... 8
Changes to Figure 26 and Figure 27 Captions ....................... 11
Changes to Figure 33 Caption .................................................. 12
Changes to Figure 44 ................................................................. 14
Updated Outline Dimensions ................................................... 19
Changes to Ordering Guide ...................................................... 20
5/04—Re v. C to Re v. D
Updated Format ............................................................. Universal
Edit to Light Sensitivity Section ............................................... 16
Updated Outline Dimensions ................................................... 19
Changes to Ordering Guide ...................................................... 20
7/03—Re v. B to Re v. C
Changes to Features ....................................................................... 1
Change to General Description .................................................... 1
Addition to Functional Block Diagrams ..................................... 1
Addition to Absolute Maximum Ratings .................................... 4
Addition to Ordering Guide ......................................................... 4
Change to Equation in Maximum Power Dissipation
Section .......................................................................................... 11
Added Light Sensitivity Section ................................................ 12
Added New Figure 8; Renumbered Subsequently .................. 13
Added New MicroCSP Assembly Considerations Section .... 13
Changes to Figure 9 .................................................................... 13
Change to Equation in Photodiode Preamplifier
Applications Section .................................................................. 13
Changes to Figure 12 .................................................................. 14
Change to Equation in D/A Conversion Section .................... 14
Updated Outline Dimensions ................................................... 15
3/03—Rev. A to Rev. B
Changes to Functional Block Diagram ....................................... 1
Changes to Absolute Maximum Ratings..................................... 4
Changes to Ordering Guide ........................................................ 4
Changes to Figure 9 ................................................................... 13
Updated Outline Dimensions .................................................... 15
11/02—Rev. 0 to Rev. A
Change to Electrical Characteristics ............................................ 2
Changes to Absolute Maximum Ratings..................................... 4
Changes to Ordering Guide ......................................................... 4
Change to TPC 6 ........................................................................... 5
Updated Outline Dimensions .................................................... 15
5/02—Revision 0: Initial Version
AD8605/AD8606/AD8608 Data Sheet
Rev. L | Page 4 of 24
5 V ELECTRICAL SPECIFICATIONS
VS = 5 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage
V
OS
AD8605/AD8606 (Except WLCSP) VS = 3.5 V, VCM = 3 V 20 65 µV
AD8608 VS = 3.5 V, VCM = 2.7 V 20 75 µV
AD8605/AD8606/AD8608 VS = 5 V, VCM = 0 V to 5 V 80 300 µV
−40°C < TA < +125°C 750 µV
Input Bias Current
I
B
0.2
1
pA
AD8605/AD8606 −40°C < TA < +85°C 50 pA
AD8605/AD8606 −40°C < TA < +125°C 250 pA
AD8608 −40°C < TA < +85°C 100 pA
AD8608 −40°C < TA < +125°C 300 pA
Input Offset Current IOS 0.1 0.5 pA
−40°C < T
A
< +85°C
20
pA
−40°C < TA < +125°C 75 pA
Input Voltage Range 0 5 V
Common-Mode Rejection Ratio CMRR VCM = 0 V to 5 V 85 100 dB
−40°C < TA < +125°C 75 90 dB
Large Signal Voltage Gain AVO RL = 2 kΩ, VO = 0.5 V to 4.5 V 300 1000 V/mV
Offset Voltage Drift
AD8605/AD8606 ΔVOS/ΔT −40°C < TA < +125°C 1 4.5 µV/°C
AD8608 ΔVOS/ΔT −40°C < TA < +125°C 1.5 6.0 µV/°C
INPUT CAPACITANCE
Common-Mode Input Capacitance CCOM 8.8 pF
Differential Input Capacitance CDIFF 2.6 pF
OUTPUT CHARACTERISTICS
Output Voltage High VOH IL = 1 mA 4.96 4.98 V
IL = 10 mA 4.7 4.79 V
−40°C < TA < +125°C 4.6 V
Output Voltage Low VOL IL = 1 mA 20 40 mV
I
L
= 10 mA
170
210
mV
−40°C < TA < +125°C 290 mV
Output Current IOUT ±80 mA
Closed-Loop Output Impedance ZOUT f = 1 MHz, AV = 1 1 Ω
POWER SUPPLY
Power Supply Rejection Ratio PSRR
AD8605/AD8606 VS = 2.7 V to 5.5 V 80 95 dB
AD8605/AD8606 WLCSP VS = 2.7 V to 5.5 V 75 92 dB
AD8608
V
S
= 2.7 V to 5.5 V
77
92
dB
−40°C < TA < +125°C 70 90 dB
Supply Current/Amplifier ISY IOUT = 0 mA 1 1.2 mA
−40°C < TA < +125°C 1.4 mA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ, CL = 16 pF 5 V/µs
Settling Time tS To 0.01%, 0 V to 2 V step, AV = 1 <1 µs
Unity Gain Bandwidth Product GBP 10 MHz
Phase Margin
Φ
M
65
Degrees
Data Sheet AD8605/AD8606/AD8608
Rev. L | Page 5 of 24
Parameter Symbol Conditions Min Typ Max Unit
NOISE PERFORMANCE
Peak-to-Peak Noise en p-p f = 0.1 Hz to 10 Hz 2.3 3.5 µV p-p
Voltage Noise Density en f = 1 kHz 8 12 nV/√Hz
en f = 10 kHz 6.5 nV/√Hz
Current Noise Density
i
n
f = 1 kHz
0.01
pA/√Hz
AD8605/AD8606/AD8608 Data Sheet
Rev. L | Page 6 of 24
2.7 V ELECTRICAL SPECIFICATIONS
VS = 2.7 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage
V
OS
AD8605/AD8606 (Except WLCSP) VS = 3.5 V, VCM = 3 V 20 65 µV
AD8608 VS = 3.5 V, VCM = 2.7 V 20 75 µV
AD8605/AD8606/AD8608 VS = 2.7 V, VCM = 0 V to 2.7 V 80 300 µV
−40°C < TA < +125°C 750 µV
Input Bias Current
I
B
0.2
1
pA
AD8605/AD8606 −40°C < TA < +85°C 50 pA
AD8605/AD8606 −40°C < TA < +125°C 250 pA
AD8608 −40°C < TA < +85°C 100 pA
AD8608 −40°C < TA < +125°C 300 pA
Input Offset Current IOS 0.1 0.5 pA
−40°C < T
A
< +85°C
20
pA
−40°C < TA < +125°C 75 pA
Input Voltage Range 0 2.7 V
Common-Mode Rejection Ratio CMRR VCM = 0 V to 2.7 V 80 95 dB
−40°C < TA < +125°C 70 85 dB
Large Signal Voltage Gain AVO RL = 2 kΩ, VO = 0.5 V to 2.2 V 110 350 V/mV
Offset Voltage Drift
AD8605/AD8606 ΔVOS/ΔT −40°C < TA < +125°C 1 4.5 µV/°C
AD8608 ΔVOS/ΔT −40°C < TA < +125°C 1.5 6.0 µV/°C
INPUT CAPACITANCE
Common-Mode Input Capacitance CCOM 8.8 pF
Differential Input Capacitance CDIFF 2.6 pF
OUTPUT CHARACTERISTICS
Output Voltage High VOH IL = 1 mA 2.6 2.66 V
−40°C < TA < +125°C 2.6 V
Output Voltage Low VOL IL = 1 mA 25 40 mV
−40°C < TA < +125°C 50 mV
Output Current
I
OUT
±30
mA
Closed-Loop Output Impedance ZOUT f = 1 MHz, AV = 1 1.2 Ω
POWER SUPPLY
Power Supply Rejection Ratio PSRR
AD8605/AD8606 VS = 2.7 V to 5.5 V 80 95 dB
AD8605/AD8606 WLCSP VS = 2.7 V to 5.5 V 75 92 dB
AD8608 VS = 2.7 V to 5.5 V 77 92 dB
−40°C < TA < +125°C 70 90 dB
Supply Current/Amplifier
I
SY
I
OUT
= 0 mA
1.15
1.4
mA
−40°C < TA < +125°C 1.5 mA
DYNAMIC PERFORMANCE
Slew Rate
SR
R
L
= 2 kΩ, C
L
= 16 pF
5
V/µs
Settling Time tS To 0.01%, 0 V to 1 V step, AV = 1 <0.5 µs
Unity Gain Bandwidth Product GBP 9 MHz
Phase Margin ΦM 50 Degrees
Data Sheet AD8605/AD8606/AD8608
Rev. L | Page 7 of 24
Parameter Symbol Conditions Min Typ Max Unit
NOISE PERFORMANCE
Peak-to-Peak Noise en p-p f = 0.1 Hz to 10 Hz 2.3 3.5 µV p-p
Voltage Noise Density en f = 1 kHz 8 12 nV/√Hz
en f = 10 kHz 6.5 nV/√Hz
Current Noise Density
i
n
f = 1 kHz
0.01
pA/√Hz
AD8605/AD8606/AD8608 Data Sheet
Rev. L | Page 8 of 24
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Rating
Supply Voltage 6 V
Input Voltage GND to VS
Differential Input Voltage 6 V
Output Short-Circuit Duration to GND Observe Derating Curves
Storage Temperature Range
All Packages
−65°C to +150°C
Operating Temperature Range
All Packages −40°C to +125°C
Junction Temperature Range
All Packages
−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.
Table 4.
Package Type θJA1 θJC Unit
5-Ball WLCSP (CB) 170 °C/W
5-Lead SOT-23 (RJ) 240 92 °C/W
8-Ball WLCSP (CB) 115 °C/W
8-Lead MSOP (RM) 206 44 °C/W
8-Lead SOIC_N (R) 157 56 °C/W
14-Lead SOIC_N (R) 105 36 °C/W
14-Lead TSSOP (RU)
148
23
°C/W
1 θJA is specified for the worst-case conditions, that is, a device soldered in a
circuit board for surface-mount packages.
ESD CAUTION
Data Sheet AD8605/AD8606/AD8608
Rev. L | Page 9 of 24
TYPICAL PERFORMANCE CHARACTERISTICS
OFFSET VOLTAGE (µV)
NUMBER OF AMPLIFIERS
4500
4000
0
2000
1500
1000
500
3000
2500
3500
300–200 –100 0100 200
–300
V
S
= 5V
T
A
= 25° C
V
CM
= 0V TO 5V
02731-007
Figure 7. Input Offset Voltage Distribution
TCVOS (µV/° C)
12
04.80.4
NUMBER OF AMPLIFIERS
0.8 1.6 2.4 3.2 4.0
16
8
4
24
20
4.4
V
S
= 5V
T
A
= –40° C TO + 125°C
V
CM
= 2.5V
0
1.2 2.0 2.8 3.6
02731-008
Figure 8. AD8608 Input Offset Voltage Drift Distribution
TCVOS (µV/° C)
20
10
02.60.2
NUMBER OF AMPLIFIERS
0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
14
6
2
2.2 2.4
12
16
8
4
18
0
VS = 5V
TA = –40° C TO + 125°C
VCM = 2.5V
02731-009
Figure 9. AD8605/AD8606 Input Offset Voltage Drift Distribution
0
02731-010
–0.30
–0.25
–0.20
–0.15
–0.10
–0.05
0.05
0.10
0.15
0.20
0.25
0.30
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V
CM
(V)
V
OS
(mV)
V
S
= 5V
Figure 10. Input Offset Voltage vs. Common-Mode Voltage
(200 Units, 5 Wafer Lots, Including Process Skews)
250
200
150
100
50
0
–150
–100
–50
–50 –25 025 50 75 100 125
INP UT BIAS CURRE NT (pA)
TEMPERATURE (°C)
02731-011
VSY = 5V
VCM = VSY/2
AD8605
AD8606
AD8608
Figure 11. Input Bias Current vs. Temperature
LOAD CURRENT ( mA)
1k
10
0.1
0.001 100.01
OUTPUT SATURATION VOLTAGE (mV)
0.1
1
100
1
SINK
SOURCE
V
S
= 5V
T
A
= 25° C
02731-012
Figure 12. Output Saturation Voltage vs. Load Current
AD8605/AD8606/AD8608 Data Sheet
Rev. L | Page 10 of 24
TEMPERATURE ( °C)
5.00
4.95
4.70
OUTPUT VOLTAGE (V)
4.85
4.75
4.90
4.80
VOH @ 1mA LOAD
VS = 5V
V
OH
@ 10mA LOAD
–40 –25 –10 520 35 50 65 80 95 110 125
02731-013
Figure 13. Output Voltage Swing High vs. Temperature
0.25
0
0.15
0.05
0.20
0.10
TEMPERATURE ( °C)
OUTPUT VOLTAGE (V)
V
OL
@ 1mA LOAD
V
S
= 5V V
OL
@ 10mA LOAD
–40 –25 –10 520 35 50 65 80 95 110 125
02731-014
Figure 14. Output Voltage Swing Low vs. Temperature
GAIN (d B)
100
80
–100
60
40
20
0
–20
–40
–60
–80
225
180
–225
135
90
45
0
–45
–90
–135
–180
PHASE ( Degrees)
FRE QUENCY ( Hz )
10k 40M100k 1M 10M
VS = ±2. 5V
RL = 2kΩ
CL = 20pF
ΦM = 64°
02731-015
PHASE
GAIN
Figure 15. Open-Loop Gain and Phase vs. Frequency
FREQUENCY (Hz)
6
5
01k 10M10k
OUTPUT SWING (V p-p)
100k 1M
4
3
1
2
VS = 5V
VIN = 4.9V p - p
TA = 25° C
RL = 2kΩ
AV = 1
02731-016
Figure 16. Closed-Loop Output Voltage Swing (FPBW)
FREQUENCY (Hz)
100
90
01k 100M10k 100k 1M 10M
80
70
20
60
50
30
10
40
V
S
= 5V
A
V
= 100
A
V
= 1
A
V
= 10
02731-017
OUTPUT IMPEDANCE (Ω)
Figure 17. Output Impedance vs. Frequency
FREQUENCY (Hz)
10k
CMRR (dB)
100k 1M
20
120
1k 10M
90
80
70
60
50
40
30
110
100
V
S
= 5V
02731-018
Figure 18. Common-Mode Rejection Ratio (CMRR) vs. Frequency
Data Sheet AD8605/AD8606/AD8608
Rev. L | Page 11 of 24
FREQUENCY (Hz)
140
80
–601k 10M10k
PSRR ( dB)
100k 1M
40
0
–40
100
120
60
20
–20
VS = 5V
02731-019
Figure 19. PSRR vs. Frequency
CAPACITANCE ( pF )
45
40
010 1k100
SMALL SIGNAL O VERSHOOT (%)
35
30
10
25
20
15
5
V
S
= 5V
R
L
=
∞
T
A
= 25° C
A
V
= –1
+OS
–OS
02731-020
Figure 20. Small Signal Overshoot vs. Load Capacitance
TEMPERATURE ( °C)
2.0
0
SUPPLY CURRENT /AMP LIFI E R ( mA)
–40 125–25 –10 95 110
1.5
1.0
0.5
520 35 50 65 80
02731-021
V
S
= 2.7V
V
S
= 5V
Figure 21. Supply Current/Amplifier vs. Temperature
SUPPLY VOLTAGE (V)
1.0
0.4
0
SUPPLY CURRENT /AMP LIFI E R ( mA)
0.9
0.5
0.3
0.1
0.7
0.6
0.2
0.8
05.04.5
4.03.53.02.52.01.51.00.5
02731-022
Figure 22. Supply Current/Amplifier vs. Supply Voltage
TIME (1s/DIV)
VOLTAGE NOISE (1µV/DIV)
VS = 5V
02731-023
Figure 23. 0.1 Hz to 10 Hz Input Voltage Noise
TIME ( 200ns/ DIV)
VOLTAGE ( 50mV /DIV )
02731-024
V
S
= ±2. 5V
R
L
= 10kΩ
C
L
= 200pF
A
V
= 1
Figure 24. Small Signal Transient Response
AD8605/AD8606/AD8608 Data Sheet
Rev. L | Page 12 of 24
TIME ( 400ns/ DIV)
VOLTAGE (1V/DIV)
VS = ±2. 5V
RL = 10kΩ
CL = 200pF
AV = 1
02731-025
Figure 25. Large Signal Transient Response
TIME ( 400ns/ DIV)
2.5V
–50mV
0V
VOUT
VIN
0V
VS = ±2. 5V
RL = 10kΩ
AV = –100
VIN = 50mV
02731-026
Figure 26. Positive Overload Recovery
VS = ±2. 5V
RL = 10kΩ
AV = –100
VIN = 50mV
TIME (1µs/DIV)
–2.5V
50mV
0V
0V
02731-027
Figure 27. Negative Overload Recovery
FREQUENCY (kHz)
36
20
4
32
28
12
8
24
16
VS = ±2. 5V
VOLTAGE NOISE DENSITY (nV/ Hz)
01.00.90.80.70.60.50.40.30.20.1
02731-028
Figure 28. Voltage Noise Density vs. Frequency
0
6.7
20.1
13.4
26.8
40.2
33.5
53.6
46.9
FREQUENCY (kHz)
VS = ±2. 5V
VOLTAGE NOISE DENSITY (nV/ Hz)
010987654321
02731-029
Figure 29. Voltage Noise Density vs. Frequency
0
14.9
44.7
29.8
59.6
89.4
74.5
119.2
104.3
FREQUENCY (Hz)
V
S
= ±2. 5V
VOLTAGE NOISE DENSITY (n V/ Hz)
0100908070605040302010
02731-030
Figure 30. Voltage Noise Density vs. Frequency
Data Sheet AD8605/AD8606/AD8608
Rev. L | Page 13 of 24
1800
1600
0
NUMBER OF AMPLIFIERS
800
600
400
200
1200
1000
1400
OFFSET VOLTAGE (µV) 300–200 –100 200
–300
V
S
= 2.7V
T
A
= 25° C
V
CM
= 0V TO 2.7V
0100
02731-031
Figure 31. Input Offset Voltage Distribution
COMMON-MODE VOLTAGE (V)
300
200
–300
0
2.7
INPUT OFFSET VOLTAGE (µV)
100
0
–200
–100
1.80.90
V
S
= 2.7V
T
A
= 25° C
02731-032
Figure 32. Input Offset Voltage vs. Common-Mode Voltage
(200 Units, 5 Wafer Lots, Including Process Skews)
250
200
150
100
50
0
–150
–100
–50
–50 –25 025 50 75 100 125
INP UT BIAS CURRE NT (pA)
TEMPERATURE (°C)
02731-039
V
SY
= 2.7V
V
CM
= V
SY
/2
AD8605
AD8606
AD8608
Figure 33. Input Bias Current vs. Temperature
LOAD CURRENT ( mA)
1k
10
0.1
0.001 100.01
OUTPUT SATURATION VOLTAGE (mV)
0.1
1
100
1
SOURCE
SINK
VS = 2.7V
TA = 25° C
02731-033
Figure 34. Output Saturation Voltage vs. Load Current
TEMPERATURE ( °C)
2.680
2.675
2.650 520 1255035
OUTPUT VOLTAGE (V)
65 80 95 110
2.665
2.655
2.670
2.660
–10–25–40
VS = 2.7V
VOH @ 1mA LOAD
02731-034
Figure 35. Output Voltage Swing High vs. Temperature
0.045
0.025
0
0.035
0.015
0.005
0.030
0.040
0.020
0.010
TEMPERATURE ( °C)
520 1255035
OUTPUT VOLTAGE (V)
65 80 95 110–10–25–40
VS = 2.7V
VOL @ 1mA LOAD
02731-035
Figure 36. Output Voltage Swing Low vs. Temperature
AD8605/AD8606/AD8608 Data Sheet
Rev. L | Page 14 of 24
FRE QUENCY ( Hz )
10k 40M100k
GAIN (d B)
100
80
–100
60
40
20
0
–20
–40
–60
–80
225
180
–225
135
90
45
0
–45
–90
–135
–180
PHASE ( Degrees)
1M 10M
02731-036
VS = 2.7V
RL = 2kΩ
CL = 20pF
ΦM = 52.5°
PHASE
GAIN
Figure 37. Open-Loop Gain and Phase vs. Frequency
FREQUENCY (Hz)
3.0
2.5
01k 10M10k
OUTPUT SWING (V p-p)
100k 1M
2.0
1.5
0.5
1.0
02731-037
VS = 2.7V
VIN = 2.6V p - p
TA = 25° C
RL = 2kΩ
AV = 1
Figure 38. Closed-Loop Output Voltage Swing vs. Frequency (FPBW)
FREQUENCY (Hz)
100
90
01k 100M10k 100k 1M 10M
80
70
20
60
50
30
10
40
A
V
= 100
A
V
= 10
A
V
= 1
V
S
= 2.7V
02731-038
OUTPUT IMPEDANCE (Ω)
Figure 39. Output Impedance vs. Frequency
CAPACITANCE ( pF )
60
50
010 1k100
SMALL SIGNAL OVERSHOOT (%)
30
20
10
40
–OS
+OS
V
S
= 2.7V
T
A
= 25° C
A
V
= 1
02731-039
Figure 40. Small Signal Overshoot vs. Load Capacitance
TIME (1s/DIV)
VS = 2.7V
VOLTAGE NOISE (1µV/DIV)
02731-040
Figure 41. 0.1 Hz to 10 Hz Input Voltage Noise
TIME ( 200ns/ DIV)
VOLTAGE ( 50mV /DIV )
02731-041
VS = ±1. 35V
RL = 10kΩ
CL = 200pF
AV = 1
Figure 42. Small Signal Transient Response
Data Sheet AD8605/AD8606/AD8608
Rev. L | Page 15 of 24
TIME ( 400ns/ DIV)
VO LTAGE ( 500mV /DIV )
VS = ±1. 35V
RL = 10kΩ
CL = 200pF
AV = 1
02731-042
Figure 43. Large Signal Transient Response