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Low Power, Precision Auto-Zero Op Amp AD8538
FEATURES
Low offset voltage: 13 V maximum Input offset drift: 0.03 V/C Single-supply operation: 2.7 V to 5.5 V High gain, CMRR, and PSRR Low input bias current: 25 pA Low supply current: 180 A
PIN CONFIGURATION DIAGRAMS
OUT V- +IN
1 5
V+
AD8538
2 3 4
-IN
Figure 1. 5-Lead TSOT-23 (UJ-5)
APPLICATIONS
Mobile communications Portable instrumentation Battery-powered devices Sensor interfaces Temperature measurement Electronic scales
NC
1 8
NC V+
-IN 2 +IN 3 V-
AD8538
7
NC = NO CONNECT
Figure 2. 8-Lead SOIC_N (R-8)
GENERAL DESCRIPTION
The AD8538 is a very high precision amplifier featuring extremely low offset voltage, low input bias current, and low power consumption. The supply current is less than 180 A at 5.0 V. Operation is fully specified from 2.7 V to 5.0 V single supply (1.35 V to 2.5 V dual supply). The AD8538 operates using very low power making this amplifier ideal for battery-powered devices and portable equipment. The AD8538 is specified over the extended industrial temperature range (-40C to +125C). The AD8538 amplifier is available in 5-lead TSOT-23, and 8-lead, narrow body SOIC packages.
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) 2005 Analog Devices, Inc. All rights reserved.
05624-001
6 OUT TOP VIEW 4 (Not to Scale) 5 NC
05624-002
TOP VIEW (Not to Scale)
AD8538 TABLE OF CONTENTS
Features .............................................................................................. 1 Applications....................................................................................... 1 Pin Configuration Diagrams........................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Electrical Specifications............................................................... 3 Absolute Maximum Ratings ............................................................5 Thermal Resistance .......................................................................5 ESD Caution...................................................................................5 Typical Performance Characteristics ..............................................6 Outline Dimensions ....................................................................... 12 Ordering Guide .......................................................................... 12
REVISION HISTORY
10/05--Revision 0: Initial Version
Rev. 0 | Page 2 of 12
AD8538 SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
@VS = 5.0 V, VCM = 2.5 V, VO = 2.5 V, TA = 25C, unless otherwise specified. Table 1.
Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol VOS -40C TA +125C IB -40C TA +85C -40C TA +125C Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High IOS -40C TA +125C CMRR AVO VOS/T VOH VCM = 0 V to 5 V -40C TA +125C; VCM = 0.2 V to 4.8 V RL = 10 k, VO = 0.1 V to 4.9 V -40C TA +125C -40C TA +125C RL = 100 k to ground -40C TA +125C RL = 10 k to ground -40C TA +125C RL = 100 k to V+ -40C TA +125C RL = 10 k to V+ -40C TA +125C 0 115 100 115 110 150 135 141 135 0.03 4.998 4.970 1.9 2.8 17 20 25 105 100 125 125 150 190 0.4 10 0.05 600 65 2.0 50 5 7 20 30 15 35 0.7 20 Conditions Min Typ 5 Max 13 30 25 100 1.0 50 150 5 Unit V V pA pA nA pA pA V dB dB dB dB V/C V V V V mV mV mV mV mA dB dB A A V/s s ms kHz Degrees V p-p nV/Hz
0.1
4.99 4.98 4.95 4.94
Output Voltage Low
VOL
Short-Circuit Limit POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time 0.01% Overload Recovery Time Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Voltage Noise Density
ISC PSRR ISY VS = 2.7 V to 5.0 V -40C TA +125C IO = 0 -40C TA +125C RL =10 k G = 1, 2 V step, CL = 20 pF, RL = 1 k
180 215
SR tS GBP OO en p-p en
RL = 10 k, RL = 100 k, CL = 20 pF f = 0.1 Hz to 10 Hz f = 1 kHz
Rev. 0 | Page 3 of 12
AD8538
@ VS = 2.7 V, VCM = 1.35 V, VO = 1.35 V, TA = 25C, unless otherwise specified. Table 2.
Parameter INPUT CHARACTERISTICS Offset Voltage Input Bias Current Symbol VOS -40C TA +125C IB -40C TA +85C -40C TA +125C Input Offset Current Input Voltage Range Common-Mode Rejection Ratio Large Signal Voltage Gain Offset Voltage Drift OUTPUT CHARACTERISTICS Output Voltage High IOS -40C TA +125C CMRR AVO VOS/T VOH VCM = 0 V to 2.5 V -40C TA +125C RL = 10 k, VO = 0.1 V to 1.7 V -40C TA +125C -40C TA +125C RL = 100 k to ground -40C TA +125C RL = 10 k to ground -40C TA +125C RL = 100 k to V+ -40C TA +125C RL = 10 k to V+ -40C TA +125C 0 110 100 110 105 140 135 140 135 0.03 2.698 2.68 1.7 2.4 14 20 8 105 100 125 125 150 190 0.4 5 0.05 600 65 2.0 50 5 5 20 25 15 35 0.7 20 Conditions Min Typ 5 Max 13 30 25 100 1.0 50 150 2.7 Unit V V pA pA nA pA pA V dB dB dB dB V/C V V V V mV mV mV mV mA dB dB A A V/s s ms kHz Degrees V p-p nV/Hz
0.1
2.68 2.68 2.67 2.66
Output Voltage Low
VOL
Short-Circuit Limit POWER SUPPLY Power Supply Rejection Ratio Supply Current/Amplifier DYNAMIC PERFORMANCE Slew Rate Settling Time 0.01% Overload Recovery Time Gain Bandwidth Product Phase Margin NOISE PERFORMANCE Voltage Noise Voltage Noise Density
ISC PSRR ISY VS = 2.7 V to 5.5 V -40C TA +125C IO = 0 -40C TA +125C RL = 10 k G = 1, 1 V step, CL = 20 pF, RL = 1 k
180 215
SR tS GBP OO en p-p en
RL = 10 k, RL = 100 k, CL = 20 pF f = 0.1 Hz to 10 Hz f = 1 kHz
Rev. 0 | Page 4 of 12
AD8538 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 Lead Temperature (Soldering, 60 sec) Operating Temperature Range Junction Temperature Range Rating +6 V VSS - 0.3 V to VDD + 0.3 V 6 V Observe derating curve -65C to +150C 300C -40C to +125C -65C to +150C
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.
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 5-Lead TSOT-23 (UJ-5) 8-Lead SOIC_N (R-8) JA 207 158 JC 61 43 Unit C/W C/W
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. 0 | Page 5 of 12
AD8538 TYPICAL PERFORMANCE CHARACTERISTICS
VSY = 5 V or 2.5 V, unless otherwise noted.
450 400 350 300 250 200 150 100
05624-003
VSY = 5V 0V < VCM < 5V TA = 25C INPUT BIAS CURRENT (pA)
700 600 500 400 300 200 100 0 25
VSY = 5V AND 2.7V
NUMBER OF AMPLIFIERS
0 -10.0 -8.4 -6.8 -5.2 -3.6 -2.0 -0.4 1.2 2.8 4.4 6.0 7.6 9.2 INPUT OFFSET VOLTAGE (V)
45
65
85
105
125
TEMPERATURE (C)
Figure 3. Input Offset Voltage Distribution
14 12 NUMBER OF AMPLIFIERS 10 8 6 4 2 0 SUPPLY CURRENT (A) VSY = 5V -40C < TA < +125C
160
Figure 6. Input Bias Current vs. Temperature
TA = 25C 140 120 100 80 60 40
05624-007
05624-004
20 0
0
0.012 0.024 0.036 0.048 0.060 0.072 0.084 TCVOS (V/C)
0.096
0
1
2
3
4
5
SUPPLY VOLTAGE (V)
Figure 4. Input Offset Voltage Drift Distribution
10 8 200
Figure 7. Supply Current vs. Supply Voltage
VSY = 5V TA = 25C
INPUT OFFSET VOLTAGE (V)
6 4 2 0 -2 -4 -6 -8 -10 0 1 2 3 4 5
05624-005
SUPPLY CURRENT (A)
150
VSY = 5V VSY = 2.7V
100
50
05624-008
0 -40
10
60 TEMPERATURE (C)
110
INPUT COMMON-MODE VOLTAGE (V)
Figure 5. Input Offset Voltage vs. Input Common-Mode Voltage
Figure 8. Supply Current vs. Temperature
Rev. 0 | Page 6 of 12
05624-006
50
AD8538
10000 VSY = 5V TA = 25C 70 60 50 135
OUTPUT SATURATION VOLTAGE (mV)
1000
100 VOL 10 SOURCE
OPEN-LOOP GAIN (dB)
VSY - VOH
40 30 20 M 10 0
90
45
1 SINK
05624-009
0 VSY = 2.5V AND 1.35V RL = 100k CL = 20pF 10k 100k
0.1
-10 -20 1k
0.01
0.1 LOAD CURRENT (mA)
1
10
FREQUENCY (Hz)
Figure 9. Output Saturation Voltage vs. Load Current
35 VSY = 5V RL = 10k VSY - VOH 25 20 VOL 15 10 5 0 -40
Figure 12. Open-Loop Gain and Phase vs. Frequency
120
OUTPUT SATURATION VOLTAGE (mV)
30
VSY = 5V AND 2.7V TA = 25C
100
80
CMRR (dB)
60
40
20
05624-010 05624-013
-25
-10
5
20
35
50
65
80
95
110
125
0 100
1k
10k FREQUENCY (Hz)
100k
1M
TEMPERATURE (C)
Figure 10. Output Saturation Voltage vs. Temperature
60
Figure 13. CMRR vs. Frequency
100
VSY = 5V AND 2.7V CL = 20pF RL = 2k AV = 100
VSY = 2.5V AND 1.35V TA = 25C
80 +PSRR
PSRR (dB)
CLOSED-LOOP GAIN (dB)
40
60 -PSRR 40
20
AV = 10
0
AV = 1
20
05624-014 05624-011
-20 1k
10k
100k
1M
0 100
1k
10k FREQUENCY (Hz)
100k
1M
FREQUENCY (Hz)
Figure 11. Closed-Loop Gain vs. Frequency
Figure 14. PSRR vs. Frequency
Rev. 0 | Page 7 of 12
05624-012
0.01 0.001
-45 1M
OPEN-LOOP PHASE SHIFT (Degrees)
AD8538
1000 VSY = 5V AND 2.7V AV = 100
VSY = 5V AV = 1 CL = 300pF RL = 10k
100
OUTPUT IMPEDANCE ()
10
AV = 10
1
AV = 1
0.1
05624-022
VOLTAGE (1V/DIV)
0.01 100
1k
10k FREQUENCY (Hz)
100k
1M
TIME (4s/DIV)
Figure 15. Closed-Loop Output Impedance vs. Frequency
60
Figure 18. Large Signal Transient Response
VSY = 5V AV = -50
SMALL SIGNAL OVERSHOOT (%)
50
40
VIN (mV)
VSY = 5V TA = 25C RL = 2k
100
0
30
OS+
0
VOUT (V)
20 OS-
05624-015
10
05624-017
-2.5 TIME (10s/DIV)
0
1
10
100
1000
LOAD CAPACITANCE (pF)
Figure 16. Small Signal Overshoot vs. Load Capacitance
VSY = 5V AND 2.7V AV = 1 CL = 300pF RL = 2k
Figure 19. Positive Overload Recovery
VSY = 5V AV = -50
0
VIN (mV)
VOLTAGE (50mV/DIV)
-100
2.5
VOUT (V)
05624-016
TIME (4s/DIV)
TIME (10s/DIV)
Figure 17. Small Signal Transient Response
Figure 20. Negative Overload Recovery
Rev. 0 | Page 8 of 12
05624-019
0
05624-018
AD8538
1000 VSY = 5V TA = 25C VIN
VOLTAGE NOISE DENSITY (nV/Hz)
VOLTAGE (1V/DIV)
VOUT
100
10 10
100
1k FREQUENCY (Hz)
10k
05624-021
TIME (200s/DIV)
Figure 21. Voltage Noise Density
VSY = 5V AND 2.7V
Figure 23. No Phase Reversal
VOLTAGE (500nV/DIV)
TIME (1s/DIV)
Figure 22. 0.1 Hz to 10 Hz Input Voltage Noise
05624-020
Rev. 0 | Page 9 of 12
05624-023
VSY = 5V AV = 1 VIN = 6V p-p RL = 10k
AD8538
VS = 2.7 V or 1.35 V.
180 VSY = 2.7V 0V < VCM < 2.7V 160 T = 25C A 140
NUMBER OF AMPLIFIERS
10000
OUTPUT SATURATION VOLTAGE (mV)
VSY = 2.7V TA = 25C
1000
120 100 80 60 40
05624-024
100
10 SOURCE 1 SINK
05624-027
20 0 -10.0 -8.4 -6.8 -5.2 -3.6 -2.0 -0.4 1.2 2.8 4.4 6.0 7.6 9.2 INPUT OFFSET VOLTAGE (V)
0.1 0.001
0.01
0.1
1
LOAD CURRENT (mA)
Figure 24. Input Offset Voltage Distribution
35 30 NUMBER OF AMPLIFIERS 25 20 15 10 5 0
Figure 27. Output Saturation Voltage vs. Load Current
30
OUTPUT SATURATION VOLTAGE (mV)
VSY = 2.7V -40C < TA < +125C
VSY = 2.7V RL = 10k
25 VSY = VOH 20
15 VOL 10
5
05624-028
05624-025
0
0.012 0.024 0.036 0.048 0.060 0.072 0.084 0.096 TCVOS (V/C)
0 -40
-25
-10
5
20
35
50
65
80
95
110
125
TEMPERATURE (C)
Figure 25. Input Offset Voltage Drift Distribution
10 80
Figure 28. Output Saturation Voltage vs. Temperature
VSY = 2.7V TA = 25C 70 RL = 2k
VSY = 2.7V 8 TA = 25C 6 4 2 0
SMALL SIGNAL OVERSHOOT (%)
INPUT OFFSET VOLTAGE (V)
60 50 40 30 20 10 0
OS+ OS-
05624-029
-2 -4 -6 -8 -10 0 0.5 1.0 1.5 2.0 2.5
05624-026
1
10
100
1000
INPUT COMMON-MODE VOLTAGE (V)
LOAD CAPACITANCE (pF)
Figure 26. Input Offset Voltage vs. Input Common-Mode Voltage
Figure 29. Small Signal Overshoot vs. Load Capacitance
Rev. 0 | Page 10 of 12
AD8538
VSY = 2.7V AV = 1 CL = 100pF RL = 10k
1000
VSY = 2.7V TA = 25C
VOLTAGE NOISE DENSITY (nV/Hz)
05624-030
VOLTAGE (500mV/DIV)
100
TIME (4s/DIV)
10 10
100
1k FREQUENCY (Hz)
10k
100k
Figure 30. Large Signal Transient Response
Figure 31. Voltage Noise Density
Rev. 0 | Page 11 of 12
05624-032
AD8538 OUTLINE DIMENSIONS
2.90 BSC
5.00 (0.1968) 4.80 (0.1890)
4
8 5
5
1.60 BSC
1 2 3
2.80 BSC
4.00 (0.1574) 3.80 (0.1497) 1
6.20 (0.2440)
4 5.80 (0.2284)
PIN 1 0.95 BSC *0.90 0.87 0.84 1.90 BSC
0.25 (0.0098) 0.10 (0.0040)
1.27 (0.0500) BSC
1.75 (0.0688) 1.35 (0.0532)
0.50 (0.0196) x 45 0.25 (0.0099)
*1.00 MAX
0.20 0.08 8 4 0 0.60 0.45 0.30
0.51 (0.0201) COPLANARITY SEATING 0.31 (0.0122) 0.10 PLANE
8 0.25 (0.0098) 0 1.27 (0.0500) 0.40 (0.0157) 0.17 (0.0067)
0.10 MAX
0.50 0.30
SEATING PLANE
COMPLIANT TO JEDEC STANDARDS MS-012-AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
*COMPLIANT TO JEDEC STANDARDS MO-193-AB WITH THE EXCEPTION OF PACKAGE HEIGHT AND THICKNESS.
Figure 32. 5-Lead Thin Small Outline Transistor Package [TSOT_23] (UJ-5) Dimensions shown in millimeters
Figure 33. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model AD8538AUJZ-R2 1 AD8538AUJZ-REEL1 AD8538AUJZ-REEL71 AD8538ARZ1 AD8538ARZ-REEL1 AD8538ARZ-REEL71
1
Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C
Package Description 5-Lead TSOT-23 5-Lead TSOT-23 5-Lead TSOT-23 8-Lead SOIC_N 8-Lead SOIC_N 8-Lead SOIC_N
Package Option UJ-5 UJ-5 UJ-5 R-8 R-8 R-8
Branding AOC AOC AOC
Z = Pb-free part.
(c) 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05624-0-10/05(0)
T T
Rev. 0 | Page 12 of 12

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