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1 A Micropower CMOS Operational Amplifiers AD8502/AD8504
FEATURES
Supply current: 1 A maximum/amplifier Offset voltage: 3 mV maximum Single-supply or dual-supply operation Rail-to-rail input and output No phase reversal Unity gain stable
PIN CONFIGURATIONS
OUT A 1 -IN A 2
8
V+
V- 4
5
+IN B
Figure 1. 8-Lead SOT-23
OUT A -IN A +IN A V+ +IN B -IN B OUT B
1 2 3 4 5 6 7
APPLICATIONS
Portable equipment Remote sensors Low power filters Threshold detectors Current sensing
14 13
OUT D -IN D +IN D V- +IN C -IN C OUT C
06323-038
AD8504
TOP VIEW (Not to Scale)
12 11 10 9 8
Figure 2. 14-Lead TSSOP (RU-14)
GENERAL DESCRIPTION
The AD8502/AD8504 are low power, precision CMOS operational amplifiers featuring a maximum supply current of 1 A. The AD8502/AD8504 have a maximum offset voltage of 3 mV and a typical input bias current of 1 pA operating rail-to-rail on both the input and output. The AD8502/AD8504 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 AD8502/AD8504 are ideally suited for a variety of battery-powered portable applications. Potential applications include bedside monitors, 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 use of the AD8502/AD8504 in systems with high gain without creating excessively large output offset errors. The AD8502 and AD8504 offer an additional benefit by providing high accuracy without the need for system calibration. The AD8502/AD8504 are fully specified over the industrial temperature range (-40C to +85C) and the extended industrial temperature range (-40C to +125C). The AD8502 is available in an 8-lead, SOT-23 surface-mount package. The AD8504 is available in a 14-lead TSSOP surface-mount package.
Rev. 0
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 (c)2007 Analog Devices, Inc. All rights reserved.
06323-001
OUT B TOP VIEW +IN A 3 (Not to Scale) 6 -IN B
7
AD8502
AD8502/AD8504 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 Pin Configurations ........................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Characteristics............................................................. 3 Absolute Maximum Ratings ............................................................6 Thermal Resistance .......................................................................6 ESD Caution...................................................................................6 Typical Performance Characteristics ..............................................7 Outline Dimensions ....................................................................... 14 Ordering Guide .......................................................................... 14
REVISION HISTORY
1/07--Revision 0: Initial Version
Rev. 0 | Page 2 of 16
AD8502/AD8504 SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
@ VS = 5 V, VCM = VS/2, TA = 25C, unless otherwise noted. Table 1.
Parameter INPUT CHARACTERISTICS Offset Voltage Symbol VOS Conditions 0 V < VCM < 5 V -40C < TA < +85C -40C < TA < +125C -40C < TA < +85C -40C < TA < +125C 0 V < VCM < 5 V -40C < TA < +85C -40C < TA < +125C 0 V < VCM < 5 V -40C < TA < +85C -40C < TA < +125C 0 V < VCM < 5 V -40C < TA < +85C -40C to +125C 0.1 V < VOUT < 4.9 V; RLOAD = 1 M 0.1 V < VOUT < 4.9 V; -40C < TA < +85C 0.1 V < VOUT < 4.9 V; -40C < TA < +125C 0 67 65 65 98 93 75 Min Typ 0.5 Max 3 5 5.5 Unit mV mV mV V/C V/C pA pA pA pA pA pA V dB dB dB dB dB dB pF pF V V V V V V mV mV mV mV mV mV mA dB dB dB A A A V/s kHz Degrees
Offset Voltage Drift Input Bias Current
VOS/T IB
7 5 1
Input Offset Current
IOS
0.5
Input Voltage Range Common-Mode Rejection Ratio
IVR CMRR
10 100 600 5 50 100 5.0
76
Large Signal Voltage Gain
AVO
120
Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High
CDIFF CCM VOH RLOAD = 100 k to GND -40C < TA < +85C -40C to +125C RLOAD = 10 k to GND -40C < TA < +85C -40C to +125C RLOAD = 100 k to VS -40C < TA < +85C -40C to +125C RLOAD = 10 k to VS -40C < TA < +85C -40C to +125C VOUT = GND 1.8 V < VS < 5 V -40C < TA < +85C -40C < TA < +125C VO = VS/2 -40C < TA < +85C -40C < TA < +125C RLOAD = 1 M 4.970 4.960 4.950 4.900 4.810 4.650
2 4.5 4.990
4.930
Output Voltage Low
VOL
1.6
15
5 7 7 20 37 40
Short-Circuit Current POWER SUPPLY Power Supply Rejection Ratio
ISC PSRR
5 85 66 66 105
Supply Current/Amplifier
ISY
0.75
1 1.5 2
DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin
SR GBP OO
0.004 7 60
Rev. 0 | Page 3 of 16
AD8502/AD8504
Parameter NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density Symbol Conditions 0.1 Hz to 10 Hz f = 1 kHz f = 1 kHz Min Typ 6 190 0.1 Max Unit V p-p nV/Hz pA/Hz
en in
@ VS = 1.8 V, VCM = VS/2, TA = 25C, unless otherwise noted. Table 2.
Parameter INPUT CHARACTERISTICS Offset Voltage Symbol VOS Conditions 0 V < VCM < 1.8 V -40C < TA < +85C -40C < TA < +125C -40C < TA < +85C -40C < TA < +125C 0 V < VCM < 1.8 V -40C < TA < +85C -40C < TA < +125C 0 V < VCM < 1.8 V -40C < TA < +85C -40C < TA < +125C 0 V < VCM < 1.8 V -40C < TA < +85C -40C < TA < +125C 0.1 V < VOUT < 1.7 V; RLOAD = 1 M 0.1 V < VOUT < 1.7 V; -40C < TA < +85C 0.1 V < VOUT < 1.7 V; -40C < TA < +125C 0 59 56 55 88 80 65 Min Typ 0.5 Max 3 5 5.5 Unit mV mV mV V/C V/C pA pA pA pA pA pA V dB dB dB dB dB dB pF pF V V V V V V 1.0 5 6 7 20 28 29 mV mV mV mV mV mV mA dB dB dB A A A
Offset Voltage Drift Input Bias Current
VOS/T IB
7 5 1
Input Offset Current
IOS
0.5
Input Voltage Range Common-Mode Rejection Ratio
IVR CMRR
10 100 600 5 50 100 1.8
75
Large Signal Voltage Gain
AVO
110
Input Capacitance OUTPUT CHARACTERISTICS Output Voltage High
CDIFF CCM VOH RLOAD = 100 k to GND -40C < TA < +85C -40C to +125C RLOAD = 10 k to GND -40C < TA < +85C -40C to +125C 1.79 1.78 1.77 1.75 1.70 1.65
2 4.5 1.795
1.764
Output Voltage Low
VOL
RLOAD = 100 k to VS -40C < TA < +85C -40C to +125C RLOAD = 10 k to VS -40C < TA < +85C -40C to +125C
10
Short-Circuit Current POWER SUPPLY Power Supply Rejection Ratio
ISC PSRR 1.8 V < VS < 5 V -40C < TA < +85C -40C < TA < +125C VO = VS/2 -40C < TA < +85C -40C < TA < +125C
Rev. 0 | Page 4 of 16
5 85 66 66 105
Supply Current/Amplifier
ISY
0.65
1 1.5 2
AD8502/AD8504
Parameter DYNAMIC PERFORMANCE Slew Rate Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Peak-to-Peak Noise Voltage Noise Density Current Noise Density Symbol SR GBP OO Conditions RLOAD = 1 M Min Typ 0.004 7 60 6 190 0.1 Max Unit V/s kHz Degrees V p-p nV/Hz pA/Hz
en in
0.1 Hz to 10 Hz f = 1 kHz f = 1 kHz
Rev. 0 | Page 5 of 16
AD8502/AD8504 ABSOLUTE MAXIMUM RATINGS
TA = 25C, 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 - 0.3 V to VDD + 0.3 V 6 V Indefinite -65C to +150C -40C to +125C -65C to +150C 300C
THERMAL RESISTANCE
JA 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 8-Lead SOT-23 (RJ-8) 14-Lead TSSOP (RU-14) JA 376 180 JC 126 35 Unit C/W C/W
ESD CAUTION
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 25C, unless otherwise noted.
Rev. 0 | Page 6 of 16
AD8502/AD8504 TYPICAL PERFORMANCE CHARACTERISTICS
160 140
1000
100
INPUT BIAS CURRENT (pA)
NUMBER OF AMPLIFIERS
120 100 80 60 40 20 0 -2400 -1800 -1200
10
1
0.1
0.01
-600
0 VOS (V)
600
1200
1800
2400
06323-002
-20
0
20
40
60
80
100
120
TEMPERATURE (C)
Figure 3. Input Offset Voltage Distribution (0 V < VC < 5.0 V), VS = 5 V
200
Figure 6. Input Bias Current vs. Temperature (VS = 1.8 V and 5.0 V)
1000
IB (+125C)
100
INPUT BIAS CURRENT (pA)
NUMBER OF AMPLIFIERS
150
IB (+85C) 10
100
1
IB (+25C)
0.1
50
0.01
IB (-40C)
06323-003
1
3
5
7
9
11 13 15 17 TCVOS (V/C)
19
21
23
25
0
0.5
1.0
1.5
2.0
2.5 VCM (V)
3.0
3.5
4.0
4.5
5.0
Figure 4. Input Offset Voltage Temperature Drift Distribution (-40C < TA < +85C), VS = 5 V
1000 800 600
Figure 7. Input Bias Current vs. Common-Mode Voltage, VS = 5 V
70 60
NUMBER OF AMPLIFIERS
400 VOS (V) 200 0 -200 -400 -600 -800 -1000 0 1 2 3 VCM (V) 4 5
06323-004
50 40 30 20 10 0 0.5
0.6
0.7
0.8
ISY (A)
0.9
1.0
Figure 5. Input Offset Voltage vs. Common-Mode Voltage, VS = 5 V
Figure 8. Supply Current Distribution, VS = 5 V
Rev. 0 | Page 7 of 16
06323-007
06323-006
0
0.001
06323-005
0.001 -40
AD8502/AD8504
1.0
1000
OUTPUT SATURATION VOLTAGE (mV)
0.9 0.8 0.7 0.6
100 SOURCE 10
ISY (A)
0.5 0.4 0.3 0.2 0.1 0 1 2 3 VS (V) 4 5 6
06323-008
1
SINK
0.1
0.01
0.1
1
LOAD CURRENT (mA)
Figure 9. Supply Current vs. Input Common-Mode Voltage
Figure 12. Output Saturation Voltage vs. Load Current, VS = 5 V
1.2
100
1.0
0.8
ISY @ 5.0V
OUTPUT SATURATION VOLTAGE (mV)
VOH @ 10k LOAD
10
VOL @ 10k LOAD VOH @ 100k LOAD
ISY (A)
0.6
ISY @ 1.8V
0.4
1
VOL @ 100k LOAD
0.2
06323-009
-25
-10
5
20
35
50
65
80
95
110
125
-15
10
35
60
85
TEMPERATURE (C)
TEMPERATURE (C)
Figure 10. Supply Current vs. Temperature
900
Figure 13. Output Saturation Voltage vs. Temperature, VS = 5 V
80 60 40 20 0 -20 -40 -60 -80 10 120 90
850
OPEN-LOOP GAIN (dB)
800
30 0 -30 -60 -90 -120 100k
750
700
650
0
0.5
1.0
1.5
2.0
2.5 VCM (V)
3.0
3.5
4.0
4.5
5.0
06323-010
100
1k FREQUENCY (Hz)
10k
Figure 11. Supply Current vs. Input Common-Mode Voltage, VS = 5 V
Figure 14. Open-Loop Gain and Phase vs. Frequency, VS = 5 V
Rev. 0 | Page 8 of 16
06323-013
600
PHASE MARGIN (Degrees)
60
ISY (nA)
06323-012
0 -40
0.1 -40
06323-011
0
0.01 0.001
AD8502/AD8504
120
0.20 0.15 0.10 0.05
VOUT (V)
110
100 90 80
CMRR (dB)
70 60 50 40 30
0 -0.05 -0.10 -0.15 -0.20 -0.5
20
10
06323-014
0.1 FREQUENCY (kHz)
1
10
0
0.5 TIME (ms)
1.0
1.5
Figure 15. CMRR vs. Frequency, VS = 5 V
100 90 80
Figure 18. Small Signal Transient Response (No Load), VS = 5 V
0.20 0.15 0.10
70
PSRR (dB)
VOUT (V)
60 50 40 30
0.05 0 -0.05 -0.10
20
10
06323-015
-0.15 -0.20 -0.5
0.1 FREQUENCY (kHz)
1
10
0
0.5 TIME (ms)
1.0
1.5
Figure 16. PSRR vs. Frequency, VS = 5 V
35 30 25
OVERSHOOT (%)
Figure 19. Small Signal Transient Response (100 pF Load Capacitance, VS = 5 V)
6
5
OS+
VOUT (V)
4
20 15 10 5 0 10
OS-
3
2
1
06323-016
100 LOAD CAPACITANCE (pF)
1000
-1
0
1
2
3 TIME (ms)
4
5
6
7
8
Figure 17. Small Signal Overshoot vs. Load Capacitance, VS = 5 V
Figure 20. Large Signal Transient Response No Load), VS = 5 V
Rev. 0 | Page 9 of 16
06323-019
0 -2
06323-018
0 0.01
06323-017
0 0.01
AD8502/AD8504
1000
VS
VOLTAGE NOISE DENSITY (nV/ Hz)
06323-020
100ms/DIV
100
VOUT
GAIN = +1 VIN = VS/2
TIME (s)
1
10
100 FREQUENCY (Hz)
1k
Figure 21. Turn-On Transient Response, VS = 5 V
4 3 2 1 0 -1 -2 -3 -4 -0.005 -0.003 VOUT VIN NUMBER OF AMPLIFIERS 160 140 120 100 80 60 40
Figure 24. Input Voltage Noise (VS = 5 V and 1.8 V)
OUTPUT VOLTAGE (V)
-0.001
0.001
0.003
0.005
0.007
0.009
06323-021
0 -2400
-1800
-1200
-600
TIME (s)
0 600 VOS (V)
1200
1800
2400
Figure 22. No Phase Reversal, VS = 5 V
Figure 25. Input Offset Voltage Distribution (0 V < VCM < 1.8 V), VS = 1.8 V
4 3
PEAK-TO-PEAK VOLTAGE (V)
NUMBER OF AMPLIFIERS
200
2 1 0 -1 -2 -3
06323-022
150
100
50
-4
-3
-2
-1
0 TIME (s)
1
2
3
4
5
1
3
5
7
9
11 13 15 17 TCVOS (V/C)
19
21
23
25
Figure 23. 0.1 Hz to 10 Hz Input Voltage Noise (VS = 5 V and 1.8 V)
Figure 26. Input Offset Voltage Temperature Drift Distribution (-40C < TA < +85C), VS = 1.8 V
Rev. 0 | Page 10 of 16
06323-025
-4 -5
0
06323-024
20
06323-023
10
AD8502/AD8504
1000 800 600
700
650
400
VOS (V)
ISY (nA)
06323-026
200 0 -200 -400
600
550
-600 -800 -1000 0 0.3 0.6 0.9 VCM (V) 1.2 1.5 1.8
0
0.3
0.6
0.9 VCM (V)
1.2
1.5
1.8
Figure 27. Input Offset Voltage vs. Input Common-Mode Voltage, VS = 1.8 V
1000
Figure 30. Supply Current vs. Input Common-Mode Voltage, VS = 1.8 V
1000
OUTPUT SATURATION VOLTAGE (mV)
IB (+125C)
100 IB (+85C)
100 SOURCE 10
10
IB (pA)
1
IB (+25C)
1
SINK
0.1
0.01 IB (-40C)
06323-027
0.1
0
0.3
0.6
0.9 VCM (V)
1.2
1.5
1.8
0.01
0.1
1
LOAD CURRENT (mA)
Figure 28. Input Bias Current vs. Input Common-Mode Voltage, VS = 1.8 V
Figure 31. Output Saturation Voltage vs. Load Current VS = 1.8 V
70 60
100
OUTPUT SATURATION VOLTAGE (mV)
NUMBER OF AMPLIFIERS
VOH @ 10k LOAD 10 VOL @ 10k LOAD VOH @ 100k LOAD 1 VOL @ 100k LOAD
50 40 30 20 10 0 0.4
06323-028
0.5
0.6
ISY (A)
0.7
0.8
0.9
-15
10
35
60
85
TEMPERATURE (C)
Figure 29. Supply Current Distribution, VS = 1.8 V
Figure 32. Output Saturation Voltage vs. Temperature, VS = 1.8 V
Rev. 0 | Page 11 of 16
06323-031
0.1 -40
06323-030
0.001
0.01 0.001
06323-029
500
AD8502/AD8504
80 60 40 20 0 -20 -40 -60 -80 10 120 90
35 30
PHASE MARGIN (Degrees)
OPEN-LOOP GAIN (dB)
60 30 0 -30 -60 -90 -120 100k
OS- 25
OVERSHOOT (%)
20 OS+ 15 10 5 0 10
100
1k FREQUENCY (Hz)
10k
06323-032
100 LOAD CAPACITANCE (pF)
1000
Figure 33. Open-Loop Gain and Phase vs. Frequency, VS = 1.8 V
100 90 80
Figure 35. Small Signal Overshoot vs. Load Capacitance, VS = 1.8 V
0.20 0.15 0.10
70
CMRR (dB)
50 40 30
VOUT (mV)
60
0.05 0 -0.05 -0.10
20 10 0 0.01 0.1 FREQUENCY (kHz) 1 10
06323-033
-0.15 -0.20 -0.5
0
0.5 TIME (ms)
1.0
1.5
Figure 34. CMRR vs. Frequency, VS = 1.8 V
Figure 36. Small Signal Transient Response (No Load), VS = 1.8 V
Rev. 0 | Page 12 of 16
06323-035
06323-034
AD8502/AD8504
0.20 0.15
CHANNEL SEPARATION (dB)
0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110
06323-036
1V p-p - + VIN 10k A
1M - 10k + 10k
0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 -0.5
VOUT (mV)
B, C, AND D
OUT C OUT B
OUT D
06323-039
0
0.5 TIME (ms)
1.0
1.5
-120
60
100
200
500
1k
2k
5k
10k
20k
FREQUENCY (Hz)
Figure 37. Small Signal Transient Response (100 pF Load Capacitance), VS = 1.8 V
2.0 1.8 1.6 1.4
VOUT (mV)
Figure 39. Channel Separation
1.2 1.0 0.8 0.6 0.4 0.2 -1 0 1 2 3 TIME (ms) 4 5 6 7 8
06323-037
0 -2
Figure 38. Large Signal Transient Response (No Load), VS = 1.8 V
Rev. 0 | Page 13 of 16
AD8502/AD8504 OUTLINE DIMENSIONS
2.90 BSC
5.10 5.00 4.90
5
8
7
6
1.60 BSC
1 2 3 4
2.80 BSC
14
8
PIN 1 INDICATOR 0.65 BSC 1.30 1.15 0.90 1.95 BSC
4.50 4.40 4.30
1 7
6.40 BSC
PIN 1 1.05 1.00 0.80 0.65 BSC 1.20 MAX 0.15 0.05 0.30 0.19
1.45 MAX 0.38 0.22
0.22 0.08 8 4 0
0.15 MAX
SEATING PLANE
0.60 0.45 0.30
0.20 0.09
SEATING COPLANARITY PLANE 0.10
8 0
0.75 0.60 0.45
COMPLIANT TO JEDEC STANDARDS MO-178-BA
COMPLIANT TO JEDEC STANDARDS MO-153-AB-1
Figure 40. 8-Lead Small Outline Transistor Package [SOT-23] (RJ-8) Dimensions shown in millimeters
Figure 41. 14-Lead Thin Shrink Small Outline Package [TSSOP] (RU-14) Dimensions shown in millimeters
ORDERING GUIDE
Model AD8502ARJZ-R2 1 AD8502ARJZ-REEL1 AD8502ARJZ-REEL71 AD8504ARUZ1 AD8504ARUZ-REEL1
1
Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package Description 8-Lead SOT-23 8-Lead SOT-23 8-Lead SOT-23 14-Lead TSSOP 14-Lead TSSOP
Package Option RJ-8 RJ-8 RJ-8 RU-14 RU-14
Branding A1D A1D A1D
Z = Pb-free part.
Rev. 0 | Page 14 of 16
AD8502/AD8504 NOTES
Rev. 0 | Page 15 of 16
AD8502/AD8504 NOTES
(c)2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06323-0-1/07(0)
Rev. 0 | Page 16 of 16

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