Micropower Precision CMOS
Operational Amplifier
AD8500
FEATURES
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
PIN CONFIGURATION
OUT A
1
V–
2
+IN
3
5
V+
06005-001
AD8500
TOP VIEW
(Not to Scale)
4
–IN
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.
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 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.
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
ADA4505-2
ADA4505-4
20 μA
AD8506
AD8508
Rev. B
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Fax: 781.461.3113 ©2006–2009 Analog Devices, Inc. All rights reserved.
AD8500* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
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REFERENCE MATERIALS
Technical Articles
•
Low Power, Low Cost, Wireless ECG Holter Monitor
EVALUATION KITS
•
Arduino Compatible Electrochemical Gas Detection
Circuit (CN0357)
•
EVAL-OPAMP-1 Evaluation Board
DESIGN RESOURCES
•
AD8500 Material Declaration
•
PCN-PDN Information
•
Quality And Reliability
•
Symbols and Footprints
DOCUMENTATION
Data Sheet
•
AD8500: Micropower Precision CMOS Operational
Amplifier Data Sheet
DISCUSSIONS
View all AD8500 EngineerZone Discussions.
TOOLS AND SIMULATIONS
•
Analog Filter Wizard
•
Analog Photodiode Wizard
•
AD8500 SPICE Macro Model
SAMPLE AND BUY
Visit the product page to see pricing options.
TECHNICAL SUPPORT
Submit a technical question or find your regional support
number.
REFERENCE DESIGNS
•
CN0357
•
CN0397
DOCUMENT FEEDBACK
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AD8500
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Pin Configuration ............................................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics ............................................................. 3
Absolute Maximum Ratings ............................................................5
Thermal Resistance .......................................................................5
ESD Caution...................................................................................5
Typical Performance Characteristics ..............................................6
Outline Dimensions ....................................................................... 12
Ordering Guide .......................................................................... 12
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
@ V
S
= 5 V, V
CM
= V
S
/2, T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Offset Voltage Drift
Input Voltage Range
Input Bias Current
Symbol
V
OS
∆V
OS
/∆T
I
B
−40°C < T
A
< +85°C
−40°C < T
A
< +125°C
Input Offset Current
I
OS
−40°C < T
A
< +85°C
−40°C < T
A
< +125°C
0 V < V
CM
< 5 V
−40°C < T
A
< +85°C
0.1 V < V
OUT
< 4.9 V
0.1 V < V
OUT
< 4.9 V; −40°C < T
A
< +85°C
0.5
Conditions
0 V < V
CM
< 5 V
−40°C < T
A
< +85°C
−0.3
1
Min
Typ
0.235
3
Max
1
10
+5.3
10
100
600
5
50
100
Unit
mV
μV/°C
V
pA
pA
pA
pA
pA
pA
dB
dB
dB
dB
pF
pF
V
V
mV
mV
mA
dB
dB
μA
μA
μA
V/μs
kHz
Degrees
μV p-p
nV/√Hz
pA/√Hz
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Short-Circuit Current
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
CMRR
A
VO
C
DIFF
C
CM
V
OH
V
OL
I
SC
PSRR
I
SY
75
70
98
80
90
90
120
2
4.5
R
LOAD
= 100 kΩ to GND
R
LOAD
= 10 kΩ to GND
R
LOAD
= 100 kΩ to V
S
R
LOAD
= 10 kΩ to V
S
V
OUT
= GND
1.8 V < V
S
< 5 V
−40°C < T
A
< +85°C
V
O
= V
S
/2
−40°C < T
A
< +85°C
−40°C < T
A
< +125°C
4.970
4.900
4.995
4.960
0.85
6.5
±5
110
0.75
5
15
90
80
1
1.5
2
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Peak-to-Peak Noise
Voltage Noise Density
Current Noise Density
SR
GBP
Ø
O
0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
0.004
7
60
6
190
0.1
e
n
i
n
Rev. B | Page 3 of 12
AD8500
@ V
S
= 1.8 V, V
CM
= V
S
/2, T
A
= 25°C, unless otherwise noted.
Table 3.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Offset Voltage Drift
Input Voltage Range
Input Bias Current
Symbol
V
OS
∆V
OS
/∆T
I
B
−40°C < T
A
< +85°C
−40°C < T
A
< +125°C
Input Offset Current
I
OS
−40°C < T
A
< +85°C
−40°C < T
A
< +125°C
0 V < V
CM
< 1.8 V
−40°C < T
A
< +85°C
0.1 V < V
OUT
< 1.7 V
0.1 V < V
OUT
< 1.7 V; −40°C < T
A
< +85°C
0.5
Conditions
0 V < V
CM
< 1.8 V
−40°C < T
A
< +85°C
−0.3
1
Min
Typ
0.235
3.5
Max
1
12
+2.1
10
100
600
5
50
100
Unit
mV
μV/°C
V
pA
pA
pA
pA
pA
pA
dB
dB
dB
dB
pF
pF
V
V
5
15
mV
mV
mA
dB
dB
μA
μA
μA
V/μs
kHz
Degrees
μV p-p
nV/√Hz
pA/√Hz
Common-Mode Rejection Ratio
Large Signal Voltage Gain
Input Capacitance
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Short-Circuit Current
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
CMRR
A
VO
C
DIFF
C
CM
V
OH
V
OL
I
SC
PSRR
I
SY
65
60
88
70
85
83
115
2
4.5
R
LOAD
= 100 kΩ to GND
R
LOAD
= 10 kΩ to GND
R
LOAD
= 100 kΩ to V
S
R
LOAD
= 10 kΩ to V
S
1.790
1.760
1.798
1.783
0.70
5
±2
1.8 V < V
S
< 5 V
−40°C < T
A
< +85°C
V
O
= V
S
/2
−40°C < T
A
< +85°C
−40°C < T
A
< +125°C
90
80
110
0.65
1
1.5
2
DYNAMIC PERFORMANCE
Slew Rate
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Peak-to-Peak Noise
Voltage Noise Density
Current Noise Density
SR
GBP
Ø
O
0.1 Hz to 10 Hz
f = 1 kHz
f = 1 kHz
0.004
7
60
6
190
0.1
e
n
i
n
Rev. B | Page 4 of 12
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