Micropower Precision CMOS
Operational Amplifier
AD8500
PIN CONFIGURATION
Supply current: 1 μA maximum
Offset voltage: 1 mV maximum
Single-supply or dual-supply operation
Rail-to-rail input and output
No phase reversal
Unity gain stable
OUT A 1
V– 2
+IN 3
5
V+
4
–IN
AD8500
TOP VIEW
(Not to Scale)
06005-001
FEATURES
Figure 1. 5-Lead SC70
APPLICATIONS
Portable equipment
Remote sensors
Low power filters
Threshold detectors
Current sensing
GENERAL DESCRIPTION
The AD8500 is a low power, precision CMOS op amp featuring
a maximum supply current of 1 μA. The AD8500 has a maximum
offset voltage of 1 mV and a typical input bias current of 1 pA; it
operates rail-to-rail on both the input and output. The AD8500
can operate from a single-supply voltage of +1.8 V to +5.5 V or
a dual-supply voltage of ±0.9 V to ±2.75 V.
The ability to swing rail-to-rail at both the input and output
helps maximize dynamic range and signal-to-noise ratio in
systems that operate at very low voltages. The low offset voltage
allows the AD8500 to be used in systems with high gain without
having excessively large output offset errors, and it provides
high accuracy without the need for system calibration.
With its low power consumption, low input bias current, and
rail-to-rail input and output, the AD8500 is ideally suited for
a variety of battery-powered portable applications. Potential
applications include ECGs, pulse monitors, glucose meters,
smoke and fire detectors, vibration monitors, and backup
battery sensors.
The AD8500 is fully specified over the industrial temperature
range (−40°C to +85°C) and is operational over the extended
industrial temperature range (−40°C to +125°C). It is available
in a 5-lead, SC70 surface-mount package.
Table 1. Low Supply Current Op Amps
Supply Current
Single
Dual
Quad
1 μA
AD8500
AD8502
AD8504
10 μA
20 μA
ADA4505-2
ADA4505-4
AD8506
AD8508
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.
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 ©2006–2009 Analog Devices, Inc. All rights reserved.
AD8500
TABLE OF CONTENTS
Features .............................................................................................. 1
Absolute Maximum Ratings ............................................................5
Applications ....................................................................................... 1
Thermal Resistance .......................................................................5
General Description ......................................................................... 1
ESD Caution...................................................................................5
Pin Configuration ............................................................................. 1
Typical Performance Characteristics ..............................................6
Revision History ............................................................................... 2
Outline Dimensions ....................................................................... 12
Specifications..................................................................................... 3
Ordering Guide .......................................................................... 12
Electrical Characteristics ............................................................. 3
REVISION HISTORY
2/09—Rev. A to Rev. B
Added Table 1; Renumbered Sequentially .................................... 1
Changes to Typical Performance Characteristics Section ........... 6
8/06—Rev. 0 to Rev. A
Updated Format .................................................................. Universal
Changes to Figure 17, Figure 18, and Figure 19 ........................... 8
4/06—Revision 0: Initial Version
Rev. B | Page 2 of 12
AD8500
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
@ VS = 5 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Offset Voltage Drift
Input Voltage Range
Input Bias Current
Symbol
Conditions
VOS
∆VOS/∆T
0 V < VCM < 5 V
−40°C < TA < +85°C
Min
Typ
Max
Unit
0.235
3
1
10
+5.3
10
100
600
5
50
100
2
4.5
mV
μV/°C
V
pA
pA
pA
pA
pA
pA
dB
dB
dB
dB
pF
pF
4.995
4.960
0.85
6.5
±5
V
V
mV
mV
mA
−0.3
IB
1
−40°C < TA < +85°C
−40°C < TA < +125°C
Input Offset Current
IOS
Common-Mode Rejection Ratio
CMRR
Large Signal Voltage Gain
AVO
Input Capacitance
CDIFF
CCM
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Short-Circuit Current
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Peak-to-Peak Noise
Voltage Noise Density
Current Noise Density
VOH
VOL
ISC
PSRR
ISY
0.5
−40°C < TA < +85°C
−40°C < TA < +125°C
0 V < VCM < 5 V
−40°C < TA < +85°C
0.1 V < VOUT < 4.9 V
0.1 V < VOUT < 4.9 V; −40°C < TA < +85°C
RLOAD = 100 kΩ to GND
RLOAD = 10 kΩ to GND
RLOAD = 100 kΩ to VS
RLOAD = 10 kΩ to VS
VOUT = GND
4.970
4.900
1.8 V < VS < 5 V
−40°C < TA < +85°C
VO = VS/2
−40°C < TA < +85°C
−40°C < TA < +125°C
90
80
SR
GBP
ØO
en
in
75
70
98
80
0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
Rev. B | Page 3 of 12
90
90
120
5
15
110
0.75
1
1.5
2
dB
dB
μA
μA
μA
0.004
7
60
V/μs
kHz
Degrees
6
190
0.1
μV p-p
nV/√Hz
pA/√Hz
AD8500
@ VS = 1.8 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 3.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Offset Voltage Drift
Input Voltage Range
Input Bias Current
Symbol
Conditions
VOS
∆VOS/∆T
0 V < VCM < 1.8 V
−40°C < TA < +85°C
Min
Typ
Max
Unit
0.235
3.5
1
12
+2.1
10
100
600
5
50
100
2
4.5
mV
μV/°C
V
pA
pA
pA
pA
pA
pA
dB
dB
dB
dB
pF
pF
1.798
1.783
V
V
−0.3
IB
1
−40°C < TA < +85°C
−40°C < TA < +125°C
Input Offset Current
IOS
Common-Mode Rejection Ratio
CMRR
Large Signal Voltage Gain
AVO
Input Capacitance
CDIFF
CCM
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Short-Circuit Current
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Peak-to-Peak Noise
Voltage Noise Density
Current Noise Density
0.5
−40°C < TA < +85°C
−40°C < TA < +125°C
0 V < VCM < 1.8 V
−40°C < TA < +85°C
0.1 V < VOUT < 1.7 V
0.1 V < VOUT < 1.7 V; −40°C < TA < +85°C
VOH
RLOAD = 100 kΩ to GND
RLOAD = 10 kΩ to GND
VOL
RLOAD = 100 kΩ to VS
RLOAD = 10 kΩ to VS
65
60
88
70
1.790
1.760
0.70
5
±2
ISC
PSRR
ISY
1.8 V < VS < 5 V
−40°C < TA < +85°C
VO = VS/2
−40°C < TA < +85°C
−40°C < TA < +125°C
SR
GBP
ØO
en
in
0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
Rev. B | Page 4 of 12
85
83
115
90
80
5
15
110
0.65
1
1.5
2
mV
mV
mA
dB
dB
μA
μA
μA
0.004
7
60
V/μs
kHz
Degrees
6
190
0.1
μV p-p
nV/√Hz
pA/√Hz
AD8500
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
Table 4.
Parameter
Supply Voltage
Input Voltage
Differential Input Voltage
Output Short-Circuit Duration to GND
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 sec)
Rating
6V
VSS − 0.4 V to VDD + 0.4 V
±6 V
Indefinite
−65°C to +150°C
−40°C to +125°C
−65°C to +150°C
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.
Absolute maximum ratings apply at 25°C, unless otherwise noted.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 5. Thermal Characteristics
Package Type
5-Lead SC70 (KS-5)
θJA
376
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 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.
Rev. B | Page 5 of 12
θJC
126
Unit
°C/W
AD8500
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, unless otherwise noted.
1000
1200
VS = 5V AND 1.8V
VS = 5V
0V < VCM < 5V
100
INPUT BIAS CURRENT (pA)
800
600
400
10
1
0.1
0.01
200
–750
–500
–250
0
250
500
1000
750
VOS (µV)
0.001
–40
06005-002
0
–1000
0
20
40
60
80
100
120
TEMPERATURE (°C)
Figure 5. Input Bias Current vs. Temperature
Figure 2. Input Offset Voltage Distribution
1000
12
IB (+125°C)
VS = 5V
–40°C < TA < +85°C
VS = 5V
100
INPUT BIAS CURRENT (pA)
10
NUMBER OF AMPLIFIERS
–20
06005-005
NUMBER OF AMPLIFIERS
1000
8
6
4
IB (+85°C)
10
1
IB (+25°C)
0.1
0.01
2
0
0.5
1.0
1.5
2.0
2.5 3.0 3.5 4.0
TCVOS (µV/°C)
4.5
5.0
5.5
6.0
0.001
06005-003
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
VCM (V)
Figure 6. Input Bias Current vs. Common-Mode Voltage
Figure 3. Input Offset Voltage Drift Distribution
1000
0
70
VS = 5V
VS = 5V
800
60
NUMBER OF AMPLIFIERS
600
200
0
–200
–400
50
40
30
20
–600
10
–1000
0
1
2
3
VCM (V)
4
5
0
0.5
0.6
0.7
0.8
0.9
SUPPLY CURRENT (µA)
Figure 7. Supply Current Distribution
Figure 4. Input Offset Voltage vs. Common-Mode Voltage
Rev. B | Page 6 of 12
1.0
06005-007
–800
06005-004
VOS (µV)
400
06005-006
IB (–40°C)
AD8500
1000
1.0
VS = 5V
0.8
0.6
0.5
0.4
0.3
0.2
0
0
1
2
3
4
5
6
VS (V)
0.1
0.01
0.1
1
LOAD CURRENT (mA)
Figure 11. Output Saturation Voltage vs. Load Current
Figure 8. Supply Current vs. Supply Voltage
100
1.2
OUTPUT SATURATION VOLTAGE (mV)
VS = 5V
1.0
ISY AT 5.0V
0.8
ISY (µA)
SINK
1
0.01
0.001
06005-008
0.1
SOURCE
10
0.6
ISY AT 1.8V
0.4
0
–40
–25
–10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
10
VOL @ 10kΩ LOAD
VOH @ 100kΩ LOAD
06005-009
0.2
VOH @ 10kΩ LOAD
1
VOL @ 100kΩ LOAD
0.1
–40
–15
10
35
60
85
TEMPERATURE (°C)
06005-012
ISY (µA)
0.7
100
06005-011
OUTPUT SATURATION VOLTAGE (mV)
0.9
Figure 12. Output Saturation Voltage vs. Temperature
Figure 9. Supply Current vs. Temperature
80
900
120
VS = 5V
VS = 5V
PHASE
60
90
40
60
700
650
600
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
VCM (V)
5.0
GAIN
20
30
0
0
–20
–30
–40
–60
–60
–90
–80
10
100
1k
10k
FREQUENCY (Hz)
Figure 13. Open-Loop Gain and Phase vs. Frequency
Figure 10. Supply Current vs. Input Common-Mode Voltage
Rev. B | Page 7 of 12
–120
100k
PHASE MARGIN (Degrees)
750
06005-010
ISY (nA)
800
06005-013
OPEN-LOOP GAIN (dB)
850
AD8500
120
0.20
VS = 5V
110
VS = 5V
NO LOAD
0.15
100
90
0.10
VOLTAGE (V)
CMRR (dB)
80
70
60
50
0.05
0
–0.05
40
30
–0.10
20
–0.15
0.1
1
10
100
FREQUENCY (kHz)
–0.20
–0.0005
06005-014
0
0.01
0
0.0005
0.0010
0.0015
TIME (Seconds)
Figure 14. CMRR vs. Frequency
06005-017
10
Figure 17. Small Signal Transient Response
0.20
100
VS = 5V
90
VS = 5V
CL = 100pF
0.15
80
0.10
VOLTAGE (V)
PSRR (dB)
70
60
50
40
0.05
0
–0.05
30
–0.10
20
0.1
1
10
100
FREQUENCY (kHz)
–0.20
–0.0005
06005-015
0
0.01
0
0.0005
0.0010
Figure 18. Small Signal Transient Response
Figure 15. PSRR vs. Frequency
6
35
VS = 5V
NO LOAD
VS = 5V
30
5
25
OS+
VOLTAGE (V)
4
20
OS–
15
3
2
10
0
10
100
LOAD CAPACITANCE (pF)
1000
0
–0.002 –0.001
0
0.001
0.002
0.003
0.004
0.005
0.006
TIME (Seconds)
Figure 19. Large Signal Transient Response
Figure 16. Small Signal Overshoot vs. Load Capacitance
Rev. B | Page 8 of 12
0.007
0.008
06005-019
1
5
06005-016
OVERSHOOT (%)
0.0015
TIME (Seconds)
06005-018
–0.15
10
AD8500
1000
VS = 5V AND 1.8V
VOUT
06005-020
GAIN = +1
VIN = VS/2
TIME (40µs/DIV)
100
10
1
10
100
1k
Figure 23. Voltage Noise Density
Figure 20. Turn-On Transient Response
500
4
VS = 1.8V
0V < VCM < 1.8V
VS = 5V
VOUT
VIN
400
NUMBER OF AMPLIFIERS
3
2
VOLTAGE (V)
10k
FREQUENCY (Hz)
06005-023
VOLTAGE NOISE DENSITY (nV/ Hz)
VOLTAGE (2V/DIV)
VS
1
0
–1
–2
300
200
100
–0.001
0.001
0.003
0.005
0.007
0.009
TIME (s)
0
–1000
06005-021
–4
–0.005 –0.003
–750
–500
–250
0
250
Figure 21. No Phase Reversal
750
1000
Figure 24. Input Offset Voltage Distribution
4
12
VS = 1.8V
–40°C < TA < +85°C
VS = 5V AND 1.8V
3
10
NUMBER OF AMPLIFIERS
2
1
0
–1
–2
8
6
4
2
–4
–5
–4
–3
–2
–1
0
1
2
3
TIME (Seconds)
4
5
Figure 22. 0.1 Hz to 10 Hz Input Voltage Noise
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5
TCVOS (µV/°C)
Figure 25. Input Offset Voltage Drift Distribution
Rev. B | Page 9 of 12
06005-025
–3
06005-022
PEAK-TO-PEAK VOLTAGE (µV)
500
VOS (µV)
06005-024
–3
AD8500
700
1000
VS = 1.8V
VS = 1.8V
800
600
650
200
ISY (nA)
VOS (µV)
400
0
600
–200
–400
550
–600
0.3
0.6
0.9
1.2
1.5
1.8
VCM (V)
500
06005-026
0
0
1.2
1.5
1.8
1000
OUTPUT SATURATION VOLTAGE (mV)
VS = 1.8V
VS = 1.8V
IB (+85°C)
10
IB (pA)
0.9
Figure 29. Supply Current vs. Input Common-Mode Voltage
IB (+125°C)
100
1
0.6
VCM (V)
Figure 26. Input Offset Voltage vs. Input Common-Mode Voltage
1000
0.3
06005-029
–800
–1000
IB (+25°C)
0.1
0.01
100
SOURCE
10
SINK
1
0.1
0.3
0.6
0.9
1.2
1.5
1.8
VCM (V)
0.01
0.001
06005-027
0.01
0.1
1
LOAD CURRENT (mA)
Figure 27. Input Bias Current vs. Input Common-Mode Voltage
Figure 30. Output Saturation Voltage vs. Load Current
100
70
VS = 1.8V
OUTPUT SATURATION VOLTAGE (mV)
VS = 1.8V
50
40
30
20
10
0
0.4
0.5
0.6
0.7
0.8
SUPPLY CURRENT (µA)
0.9
06005-028
NUMBER OF AMPLIFIERS
60
Figure 28. Supply Current Distribution
VOH @ 10kΩ LOAD
10
VOL @ 10kΩ LOAD
VOH @ 100kΩ LOAD
1
VOL @ 100kΩ LOAD
0.1
–40
–15
10
35
60
TEMPERATURE (°C)
Figure 31. Output Saturation Voltage vs. Temperature
Rev. B | Page 10 of 12
85
06005-031
0
06005-030
IB (–40°C)
0.001
AD8500
120
0.20
60
90
0.15
40
60
0.10
0
0
–20
–30
–40
–60
–60
–90
–80
10
100
1k
0.05
0
–0.05
–0.10
–0.15
–120
100k
10k
VOLTAGE (V)
PHASE MARGIN (Degrees)
30
GAIN
–0.20
–0.0005
06005-032
OPEN-LOOP GAIN (dB)
20
VS = 1.8V
NO LOAD
VS = 1.8V
PHASE
FREQUENCY (Hz)
0
0.0005
0.0010
0.0015
TIME (Seconds)
06005-035
80
Figure 35. Small Signal Transient Response
Figure 32. Open-Loop Gain and Phase vs. Frequency
0.20
100
VS = 1.8V
90
VS = 1.8V
CL = 100pF
0.15
80
0.10
VOLTAGE (V)
CMRR (dB)
70
60
50
40
0.05
0
–0.05
30
–0.10
20
0.1
1
10
100
FREQUENCY (kHz)
–0.20
–0.0005
06005-033
0
0.01
0
0.0005
0.0010
Figure 36. Small Signal Transient Response
Figure 33. CMRR vs. Frequency
35
2.0
VS = 1.8V
VS = 1.8V
NO LOAD
1.8
30
1.6
OS–
25
VOLTAGE (V)
1.4
20
OS+
15
1.2
1.0
0.8
0.6
10
0.4
5
0
10
100
LOAD CAPACITANCE (pF)
1000
Figure 34. Small Signal Overshoot vs. Load Capacitance
0
–0.002 –0.001
0
0.001
0.002
0.003
0.004
0.005
0.006
TIME (Seconds)
Figure 37. Large Signal Transient Response
Rev. B | Page 11 of 12
0.007
0.008
06005-037
0.2
06005-034
OVERSHOOT (%)
0.0015
TIME (Seconds)
06005-036
–0.15
10
AD8500
OUTLINE DIMENSIONS
2.20
2.00
1.80
1.35
1.25
1.15
5
4
1
2
3
2.40
2.10
1.80
PIN 1
0.65 BSC
1.00
0.90
0.70
1.10
0.80
0.10 MAX
0.30
0.15
0.40
0.10
SEATING
PLANE
0.46
0.36
0.26
0.22
0.08
0.10 COPLANARITY
COMPLIANT TO JEDEC STANDARDS MO-203-AA
Figure 38. 5-Lead Thin Shrink Small Outline Transistor Package [SC70]
(KS-5)
Dimensions shown in millimeters
ORDERING GUIDE
Model
AD8500AKSZ-R2 1
AD8500AKSZ-REEL1
AD8500AKSZ-REEL71
1
Temperature Range
−40°C to +125°C
−40°C to +125°C
−40°C to +125°C
Package Description
5-Lead SC70
5-Lead SC70
5-Lead SC70
Z = RoHS Compliant Part.
©2006–2009 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06005-0-2/09(B)
Rev. B | Page 12 of 12
Package Option
KS-5
KS-5
KS-5
Branding
A0F
A0F
A0F