AD AD8500AKSZ-R2 Micropower precision cmos operational amplifier Datasheet

Micropower Precision CMOS
Operational Amplifier
AD8500
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+
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.
Rev. A
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 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
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. A | Page 2 of 12
AD8500
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
@ VS = 5 V, VCM = VS/2, TA = 25°C, unless otherwise noted.
Table 1.
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. A | 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 2.
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. A | 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 3.
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 4. 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. A | Page 5 of 12
θJC
126
Unit
°C/W
AD8500
1200
1000
1000
100
INPUT BIAS CURRENT (pA)
800
600
400
10
1
0.1
0.01
200
–750
–500
–250
0
250
500
750
1000
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
(VS = 1.8 V and 5.0 V)
Figure 2. Input Offset Voltage Distribution
(0 V < VCM < 5.0 V)
12
1000
10
100
8
6
4
IB (+125°C)
IB (+85°C)
INPUT BIAS CURRENT (pA)
NUMBER OF AMPLIFIERS
–20
06005-005
NUMBER OF AMPLIFIERS
TYPICAL PERFORMANCE CHARACTERISTICS
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
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
(−40°C < TA < +85°C)
70
1000
800
60
NUMBER OF AMPLIFIERS
600
200
0
–200
–400
50
40
30
20
–600
–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. A | Page 6 of 12
1.0
06005-007
10
–800
06005-004
VOS (µV)
400
06005-006
IB (–40°C)
AD8500
1000
OUTPUT SATURATION VOLTAGE (mV)
0.9
0.8
0.6
0.5
0.4
0.3
0.2
0
1
2
3
4
5
6
VS (V)
0.1
0.01
0.001
1
100
0.6
ISY AT 1.8V
0.4
0
–40
–25
–10
5
20
35
50
65
80
95
110
125
TEMPERATURE (°C)
VOL @ 10kΩ LOAD
VOH @ 100kΩ LOAD
06005-009
0.2
10
1
VOL @ 100kΩ LOAD
0.1
–40
–15
10
35
60
85
TEMPERATURE (°C)
Figure 12. Output Saturation Voltage vs. Temperature
Figure 9. Supply Current vs. Temperature
900
OPEN-LOOP GAIN (dB)
850
800
750
700
650
80
135
60
90
40
45
20
0
0
–45
–20
–90
–40
–135
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
VCM (V)
5.0
06005-010
–60
0
06005-012
ISY AT 5.0V
0.8
VOH @ 10kΩ LOAD
OUTPUT SATURATION VOLTAGE (mV)
1.0
ISY (µA)
0.1
Figure 11. Output Saturation Voltage vs. Load Current
1.2
ISY (µA)
0.01
LOAD CURRENT (mA)
Figure 8. Supply Current vs. Supply Voltage
600
SINK
1
–80
10
100
1k
10k
–180
100k
FREQUENCY (Hz)
Figure 13. Open-Loop Gain and Phase vs. Frequency
Figure 10. Supply Current vs. Input Common-Mode Voltage
Rev. A | Page 7 of 12
PHASE MARGIN (Degrees)
0
06005-008
0.1
SOURCE
10
06005-013
ISY (µA)
0.7
100
06005-011
1.0
AD8500
120
0.20
110
0.15
100
90
0.10
0.05
70
VOUT (V)
60
50
–0.05
40
30
–0.10
20
1
10
100
FREQUENCY (kHz)
–0.20
–0.0005
06005-014
0.1
0
0.0005
0.0010
0.0015
06005-017
–0.15
10
0
0.01
0
0.0015
06005-018
CMRR (dB)
80
TIME (Seconds)
Figure 14. CMRR vs. Frequency
Figure 17. Small Signal Transient Response
(No Load)
100
0.20
90
0.15
80
0.10
0.05
60
VOUT (V)
PSRR (dB)
70
50
40
0
–0.05
30
–0.10
20
–0.15
10
1
10
100
FREQUENCY (kHz)
–0.20
–0.0005
0.0010
Figure 18. Small Signal Transient Response
(100 pF Load Capacitance)
35
6
30
5
25
OS+
4
VOUT (V)
20
OS–
15
3
2
10
1
5
100
LOAD CAPACITANCE (pF)
1000
06005-016
OVERSHOOT (%)
0.0005
TIME (Seconds)
Figure 15. PSRR vs. Frequency
0
10
0
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
(No Load)
Figure 16. Small Signal Overshoot vs. Load Capacitance
Rev. A | Page 8 of 12
0.007
0.008
06005-019
0.1
06005-015
0
0.01
AD8500
1000
VOUT
06005-020
GAIN = +1
VIN = VS/2
TIME (µs)
100
10
1
10
1k
10k
Figure 23. Voltage Noise Density
(VS = 1.8 V and 5.0 V)
Figure 20. Turn-On Transient Response
500
4
VOUT
VIN
400
NUMBER OF AMPLIFIERS
3
OUTPUT VOLTAGE (V)
100
FREQUENCY (Hz)
06005-023
VOLTS (V)
VOLTAGE NOISE DENSITY (nV/ Hz)
VS
2
1
0
–1
–2
300
200
100
–0.001
0.001
0.003
0.005
0.007
0.009
TIME (µs)
0
–1000
06005-021
–4
–0.005 –0.003
–750
–500
-250
0
250
500
750
1000
VOS (µV)
Figure 21. No Phase Reversal
06005-024
–3
Figure 24. Input Offset Voltage Distribution
(0 V < VCM < 1.8 V)
12
4
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
(VS = 5 V and 1.8 V)
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
(−40°C < TA < +85°C)
Rev. A | Page 9 of 12
06005-025
–3
06005-022
PEAK-TO-PEAK VOLTAGE (µV)
3
AD8500
700
1000
800
600
650
200
ISY (µA)
VOS (µV)
400
0
600
–200
–400
550
–600
0.6
0.9
1.2
1.5
1.8
VCM (V)
500
0
OUTPUT SATURATION VOLTAGE (mV)
IB (+85°C)
0.1
0.01
IB (–40°C)
0.6
0.9
1.2
1.5
1.8
VCM (V)
SOURCE
10
0.1
0.01
0.1
1
LOAD CURRENT (mA)
Figure 30. Output Saturation Voltage vs. Load Current
100
OUTPUT SATURATION VOLTAGE (mV)
70
60
50
40
30
20
10
0.5
0.6
0.7
0.8
SUPPLY CURRENT (µA)
0.9
06005-028
NUMBER OF AMPLIFIERS
SINK
1
Figure 27. Input Bias Current vs. Input Common-Mode Voltage
0
0.4
1.8
100
0.01
0.001
06005-027
0.3
1.5
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
Figure 28. Supply Current Distribution
Rev. A | Page 10 of 12
85
06005-031
IB (pA)
IB (+25°C)
0
1.2
1000
IB (+125°C)
10
0.001
0.9
Figure 29. Supply Current vs. Input Common-Mode Voltage
100
1
0.6
VCM (V)
Figure 26. Input Offset Voltage vs. Input Common-Mode Voltage
1000
0.3
06005-030
0.3
06005-026
0
06005-029
–800
–1000
AD8500
45
20
0
0
–45
–20
–90
–40
0.10
–80
10
100
1k
10k
0
–0.10
–135
–60
0.05
–0.05
–0.15
–180
100k
–0.20
–0.0005
06005-032
OPEN-LOOP GAIN (dB)
40
0.15
FREQUENCY (Hz)
0
0.0005
0.0010
0.0015
06005-035
90
0.0015
06005-036
60
0.20
VOUT (mV)
135
PHASE MARGIN (Degrees)
80
TIME (Seconds)
Figure 35. Small Signal Transient Response
(No Load)
Figure 32. Open-Loop Gain and Phase vs. Frequency
0.20
100
90
0.15
80
0.10
60
VOUT (mV)
CMRR (dB)
70
50
40
0.05
0
–0.05
30
–0.10
20
–0.15
10
0.1
1
10
100
FREQUENCY (kHz)
–0.20
–0.0005
06005-033
0
0.01
0.0005
0.0010
TIME (Seconds)
Figure 36. Small Signal Transient Response
(100 pF Load Capacitance)
Figure 33. CMRR vs. Frequency
35
2.0
1.8
30
1.6
OS–
25
VOUT (mV)
1.4
20
OS+
15
1.2
1.0
0.8
0.6
10
0.4
5
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
(No Load)
Rev. A | Page 11 of 12
0.007
0.008
06005-037
0
10
0.2
06005-034
OVERSHOOT (%)
0
AD8500
OUTLINE DIMENSIONS
2.20
2.00
1.80
1.35
1.25
1.15
5
4
1
2
3
PIN 1
2.40
2.10
1.80
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 = Pb-free part.
©2006 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06005-0-8/06(A)
Rev. A | Page 12 of 12
Package Option
KS-5
KS-5
KS-5
Branding
A0F
A0F
A0F
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