Low Power, Precision, Auto-Zero Op Amps
AD8538/AD8539
Rev. A
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FEATURES
Low offset voltage: 13 μV maximum
Input offset drift: 0.03 μV/°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 μA
APPLICATIONS
Mobile communications
Portable instrumentation
Battery-powered devices
Sensor interfaces
Temperature measurement
Electronic scales
GENERAL DESCRIPTION
The AD8538/AD8539 are very high precision amplifiers featuring
extremely low offset voltage, low input bias current, and low power
consumption. The supply current is less than 215 μA maximujm
per amplifier 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/AD8539 operate at very low power making these
amplifiers ideal for battery-powered devices and portable
equipment.
The AD8538/AD8539 are specified over the extended industrial
temperature range (−40°C to +125°C). The AD8538 amplifier is
available in 5-lead TSOT-23, and 8-lead, narrow body SOIC
packages, and the AD8539 amplifier is available in 8-lead, narrow
body SOIC and 8-lead MSOP.
PIN CONFIGURATIONS
OUT
1
V–
2
+IN
3
V+
5
–IN
4
AD8538
TOP VIEW
(Not to Scale)
06741-002
Figure 1. 5-Lead TSOT-23 (UJ-5)
NC
1
−IN
2
+IN
3
V−
4
NC
8
V+
7
OUT
6
NC
5
NC = NO CONNECT
AD8538
TOP VIEW
(Not to Scale)
06741-001
Figure 2. 8-Lead SOIC_N (R-8)
OUT A
1
–IN A
2
+IN A
3
V–
4
V+
8
OUT B
7
–IN B
6
+IN B
5
AD8539
TOP VIEW
(Not to Scale)
06741-033
Figure 3. 8-Lead SOIC_N (R-8)
OUT A
1
–IN A
2
+IN A
3
V–
4
V+
8
OUT B
7
–IN B
6
+IN B
5
AD8539
TOP VIEW
(Not to Scale)
06741-034
Figure 4. 8-Lead MSOP (RM-8)
AD8538/AD8539
Rev. A | Page 2 of 24
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
AD8538 Electrical Specifications ............................................... 3
AD8539 Electrical Specifications ............................................... 5
Absolute Maximum Ratings ............................................................7
Thermal Resistance.......................................................................7
ESD Caution...................................................................................7
Typical Performance Characteristics ..............................................8
AD8538 Characteristics................................................................8
AD8539 Characteristics............................................................. 14
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 21
REVISION HISTORY
5/07—Rev. 0 to Rev. A
Added AD8539 ...................................................................Universal
Changes to Specifications Section.................................................. 3
Added Table 3, Renumbered Tables Sequentially ........................ 5
Added Table 4, Renumbered Tables Sequentially ........................ 6
Changes to Thermal Resistance Section........................................ 7
Added Figure 32 and Figure 33..................................................... 13
Added AD8539 Characteristics Section, Renumbered Figures
Sequentially ..................................................................................... 14
Updated Outline Dimensions....................................................... 20
Changes to Ordering Guide.......................................................... 21
10/05—Revision 0: Initial Version
AD8538/AD8539
Rev. A | Page 3 of 24
SPECIFICATIONS
AD8538 ELECTRICAL SPECIFICATIONS
@ VS = 5.0 V, VCM = 2.5 V, VO = 2.5 V, TA = 25°C, unless otherwise specified.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS 5 13 µV
−40°C ≤ TA ≤ +125°C 30 µV
Input Bias Current IB 15 25 pA
−40°C ≤ TA ≤ +85°C 35 100 pA
−40°C ≤ TA ≤ +125°C 0.7 1.0 nA
Input Offset Current IOS 20 50 pA
−40°C ≤ TA ≤ +125°C 150 pA
Input Voltage Range 0 5 V
Common-Mode Rejection Ratio CMRR VCM = 0 V to 5 V 115 150 dB
−40°C ≤ TA ≤ +125°C, VCM = 0.2 V to 4.8 V 100 135 dB
Large Signal Voltage Gain AVO RL = 10 kΩ, VO = 0.1 V to 4.9 V 115 141 dB
−40°C ≤ TA ≤ +125°C 110 135 dB
Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.03 0.1 µV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH RL = 100 kΩ to ground 4.99 4.998 V
−40°C ≤ TA ≤ +125°C, RL = 100 kΩ to ground 4.98 V
R
L = 10 kΩ to ground 4.95 4.970 V
−40°C ≤ TA ≤ +125°C, RL = 10 kΩ to ground 4.94 V
Output Voltage Low VOL RL = 100 kΩ to V+ 1.9 5 mV
−40°C ≤ TA ≤ +125°C, RL = 100 kΩ to V+ 2.8 7 mV
R
L = 10 kΩ to V+ 17 20 mV
−40°C ≤ TA ≤ +125°C, RL = 10 kΩ to V+ 20 30 mV
Short-Circuit Limit ISC ±25 mA
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.0 V 105 125 dB
−40°C ≤ TA ≤ +125°C 100 125 dB
Supply Current/Amplifier ISY IO = 0 150 180 µA
−40°C ≤ TA ≤ +125°C 190 215 µA
DYNAMIC PERFORMANCE
Slew Rate SR RL =10 kΩ 0.4 V/µs
Settling Time 0.01% tSG = ±1, 2 V step, CL = 20 pF, RL = 1 kΩ 10 s
Overload Recovery Time 0.05 ms
Gain Bandwidth Product GBP 430 kHz
Phase Margin ØMRL = 10 kΩ, RL = 100 kΩ, CL = 20 pF 65 Degrees
NOISE PERFORMANCE
Voltage Noise en p-p f = 0.1 Hz to 10 Hz 2.0 µV p-p
Voltage Noise Density enf = 1 kHz 50 nV/√Hz
AD8538/AD8539
Rev. A | Page 4 of 24
@ VS = 2.7 V, VCM = 1.35 V, VO = 1.35 V, TA = 25°C, unless otherwise specified.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS 5 13 µV
−40°C ≤ TA ≤ +125°C 30 µV
Input Bias Current IB 15 25 pA
−40°C ≤ TA ≤ +85°C 35 100 pA
−40°C ≤ TA ≤ +125°C 0.7 1.0 nA
Input Offset Current IOS 20 50 pA
−40°C ≤ TA ≤ +125°C 150 pA
Input Voltage Range 0 2.7 V
Common-Mode Rejection Ratio CMRR VCM = 0 V to 2.5 V 110 140 dB
−40°C ≤ TA ≤ +125°C 100 135 dB
Large Signal Voltage Gain AVO RL = 10 kΩ, VO = 0.1 V to 1.7 V 110 140 dB
−40°C ≤ TA ≤ +125°C 105 135 dB
Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.03 0.1 µV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH RL = 100 kΩ to ground 2.68 2.698 V
−40°C ≤ TA ≤ +125°C, RL = 100 kΩ to ground 2.68 V
R
L = 10 kΩ to ground 2.67 2.68 V
−40°C ≤ TA ≤ +125°C, RL = 10 kΩ to ground 2.66 V
Output Voltage Low VOL RL = 100 kΩ to V+ 1.7 5 mV
−40°C ≤ TA ≤ +125°C, RL = 100 kΩ to V+ 2.4 5 mV
R
L = 10 kΩ to V+ 14 20 mV
−40°C ≤ TA ≤ +125°C, RL = 10 kΩ to V+ 20 25 mV
Short-Circuit Limit ISC ±8 mA
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 105 125 dB
−40°C ≤ TA ≤ +125°C 100 125 dB
Supply Current/Amplifier ISY IO = 0 150 180 µA
−40°C ≤ TA ≤ +125°C 190 215 µA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 10 kΩ 0.35 V/µs
Settling Time 0.01% tSG = ±1, 1 V step, CL = 20 pF, RL = 1 kΩ 5 s
Overload Recovery Time 0.05 ms
Gain Bandwidth Product GBP 430 kHz
Phase Margin ØMRL = 10 kΩ, RL = 100 kΩ, CL = 20 pF 65 Degrees
NOISE PERFORMANCE
Voltage Noise en p-p f = 0.1 Hz to 10 Hz 2.0 µV p-p
Voltage Noise Density enf = 1 kHz 50 nV/√Hz
AD8538/AD8539
Rev. A | Page 5 of 24
AD8539 ELECTRICAL SPECIFICATIONS
@ VS = 5.0 V, VCM = 2.5 V, VO = 2.5 V, TA = 25°C, unless otherwise specified.
Table 3.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS 5 15 µV
−40°C ≤ TA ≤ +125°C 30 µV
Input Bias Current IB 15 60 pA
−40°C ≤ TA ≤ +85°C 35 125 pA
−40°C ≤ TA ≤ +125°C 0.7 1.0 nA
Input Offset Current IOS 20 70 pA
−40°C ≤ TA ≤ +125°C 400 pA
Input Voltage Range 0 5 V
−40°C ≤ TA ≤ +125°C 0.2 4.8 V
Common-Mode Rejection Ratio CMRR VCM = 0 V to 5 V 115 135 dB
−40°C ≤ TA ≤ +125°C, VCM = 0.2 V to 4.8 V 100 130 dB
Large Signal Voltage Gain AVO RL = 10 kΩ, VO = 0.1 V to 4.9 V 110 130 dB
−40°C ≤ TA ≤ +125°C 110 125 dB
Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.03 0.1 µV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH RL = 100 kΩ to ground 4.99 4.994 V
−40°C ≤ TA ≤ +125°C, RL = 100 kΩ to ground 4.98 V
R
L = 10 kΩ to ground 4.95 4.97 V
−40°C ≤ TA ≤ +125°C, RL = 10 kΩ to ground 4.94 V
Output Voltage Low VOL RL = 100 kΩ to V+ 5 7 mV
−40°C ≤ TA ≤ +125°C, RL = 100 kΩ to V+ 6 8 mV
R
L = 10 kΩ to V+ 20 25 mV
−40°C ≤ TA ≤ +125°C, RL = 10 kΩ to V+ 24 30 mV
Short-Circuit Limit ISC ±25 mA
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.0 V 105 125 dB
−40°C ≤ TA ≤ +125°C 100 125 dB
Supply Current/Amplifier ISY IO = 0 170 210 µA
−40°C ≤ TA ≤ +125°C 225 µA
DYNAMIC PERFORMANCE
Slew Rate SR RL =10 kΩ 0.4 V/µs
Settling Time 0.01% tSG = ±1, 2 V step, CL = 20 pF, RL = 1 kΩ 10 s
Overload Recovery Time 0.05 ms
Gain Bandwidth Product GBP 430 kHz
Phase Margin ØMRL = 10 kΩ, RL = 100 kΩ, CL = 20 pF 65 Degrees
NOISE PERFORMANCE
Voltage Noise en p-p f = 0.1 Hz to 10 Hz 1.2 µV p-p
Voltage Noise Density enf = 1 kHz 52 nV/√Hz
AD8538/AD8539
Rev. A | Page 6 of 24
@ VS = 2.7 V, VCM = 1.35 V, VO = 1.35 V, TA = 25°C, unless otherwise specified.
Table 4.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage VOS 5 16 µV
−40°C ≤ TA ≤ +125°C 30 µV
Input Bias Current IB 15 25 pA
−40°C ≤ TA ≤ +85°C 35 125 pA
−40°C ≤ TA ≤ +125°C 0.7 1.0 nA
Input Offset Current IOS 20 50 pA
−40°C ≤ TA ≤ +125°C 300 pA
Input Voltage Range 0 2.7 V
−40°C ≤ TA ≤ +125°C 0.2 2.5
Common-Mode Rejection Ratio CMRR VCM = 0 V to 2.7 V 110 130 dB
−40°C ≤ TA ≤ +125°C, VCM = 0.2 V to 2.5 V 100 125 dB
Large Signal Voltage Gain AVO RL = 10 kΩ, VO = 0.1 V to 2.6 V 110 130 dB
−40°C ≤ TA ≤ +125°C 105 125 dB
Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +125°C 0.03 0.1 µV/°C
OUTPUT CHARACTERISTICS
Output Voltage High VOH RL = 100 kΩ to ground 2.68 2.693 V
−40°C ≤ TA ≤ +125°C, RL = 100 kΩ to ground 2.68 V
R
L = 10 kΩ to ground 2.67 2.68 V
−40°C ≤ TA ≤ +125°C, RL = 10 kΩ to ground 2.66 V
Output Voltage Low VOL RL = 100 kΩ to V+ 5 7 mV
−40°C ≤ TA ≤ +125°C, RL = 100 kΩ to V+ 6 8 mV
R
L = 10 kΩ to V+ 14 20 mV
−40°C ≤ TA ≤ +125°C, RL = 10 kΩ to V+ 20 25 mV
Short-Circuit Limit ISC ±8 mA
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 2.7 V to 5.5 V 105 125 dB
−40°C ≤ TA ≤ +125°C 100 125 dB
Supply Current/Amplifier ISY IO = 0 210 µA
−40°C ≤ TA ≤ +125°C 225 µA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 10 kΩ 0.35 V/µs
Settling Time 0.01% tSG = ±1, 1 V step, CL = 20 pF, RL = ∞ 8 s
Overload Recovery Time 0.05 ms
Gain Bandwidth Product GBP 430 kHz
Phase Margin ØMRL = 10 kΩ, RL = 100 kΩ, CL = 20 pF 65 Degrees
NOISE PERFORMANCE
Voltage Noise en p-p f = 0.1 Hz to 10 Hz 2.0 µV p-p
Voltage Noise Density enf = 1 kHz 55 nV/√Hz
AD8538/AD8539
Rev. A | Page 7 of 24
ABSOLUTE MAXIMUM RATINGS
T = 25°C, unless otherwise noted. THERMAL RESISTANCE
A
Table 5. θJA
Parameter Rating
is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Supply Voltage +6 V Table 6. Thermal Characteristics
Input Voltage V − 0.3 V to V + 0.3 V
SS DD Package Type θ θUnit
Differential Input Voltage ±6 V JA JC
5-Lead TSOT-23 (UJ-5) 207 61 °C/W
Output Short-Circuit Duration to GND Observe derating curve
Storage Temperature Range –65°C to +150°C
Lead Temperature (Soldering, 60 sec) 300°C
Operating Temperature Range –40°C to +125°C
Junction Temperature Range −65°C to +150°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.
8-Lead SOIC_N (R-8) 125 43 °C/W
8-Lead MSOP (RM-8) 145 45 °C/W
ESD CAUTION
AD8538/AD8539
Rev. A | Page 8 of 24
TYPICAL PERFORMANCE CHARACTERISTICS
AD8538 CHARACTERISTICS
AD8538 only, V = 5 V or ±2.5 V, unless otherwise noted.
SY
700
0
100
200
300
400
500
600
25 45 65 85 105 125
06741-006
TEMPERATURE (°C)
INPUT BIAS CURRENT (pA)
VSY = 5V AND 2.7V
450
0
–10.0
06741-003
INPUT OFFSET VOLTAGE (µV)
NUMBER OF AMPLIFIERS
50
100
150
200
250
300
350
400
V
SY
= 5V
0V < V
CM
< 5V
T
A
= 25°C
–8.4 –6.8 –5.2 –3.6 –2.0 –0.4 1.2 2.8 4.4 6.0 7.6 9.2
Figure 5. AD8538 Input Offset Voltage Distribution Figure 8. AD8538 Input Bias Current vs. Temperature
14
0
0 0.096
06741-004
TCVOS (µV/°C)
NUMBER OF AMPLIFIERS
2
4
6
8
10
12
0.012 0.024 0.036 0.048 0.060 0.072 0.084
VSY = 5V
–40°C < TA < +125°C
160
0
05
06741-007
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
20
40
60
80
100
120
140
1234
T
A
= 25°C
Figure 9. AD8538 Supply Current vs. Supply Voltage
Figure 6. AD8538 Input Offset Voltage Drift Distribution
10
–10
05
06741-005
INPUT COMMON-MODE VOLTAGE (V)
INPUT OFFSET VOLTAGE (µV)
–8
–6
–4
–2
0
2
4
6
8
1234
VSY = 5V
TA = 25°C
200
0
50
100
150
–40 10 60 110
06741-008
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
V
SY
= 5V
V
SY
= 2.7V
Figure 7. AD8538 Input Offset Voltage vs. Input Common-Mode Voltage Figure 10. AD8538 Supply Current vs. Temperature
AD8538/AD8539
Rev. A | Page 9 of 24
70
–20
–10
0
10
30
40
50
60
20
–45
0
45
90
1k 10k 100k 1M
06741-012
FREQUENCY (Hz)
OPEN-LOOP GAIN (dB)
OPEN-LOOP PHASE SHIFT (Degrees)
V
SY
= ±2.5V AND ±1.35V
R
L
= 100kΩ
C
L
= 20pF
135
ФM
10000
0.01
0.1
1
10
100
1000
0.001 1010.10.01
06741-009
LOAD CURRENT (mA)
OUTPUT SATURATION VOLTAGE (mV)
V
SY
– V
OH
V
SY
= 5V
T
A
= 25°C
SOURCE
SINK
V
OL
Figure 11. AD8538 Output Saturation Voltage vs. Load Current Figure 14. AD8538 Open-Loop Gain and Phase vs. Frequency
120
0
100 1M
06741-013
FREQUENCY (Hz)
CMRR (dB)
20
40
60
80
100
1k 10k 100k
V
SY
= 5V AND 2.7V
T
A
= 25°C
35
0
5
10
15
20
25
30
–40 –25 –10 5 20 35 50 65 80 95 110 125
06741-010
TEMPERATURE (°C)
OUTPUT SATURATION VOLTAGE (mV)
V
SY
– V
OH
V
SY
= 5V
R
L
= 10kΩ
V
OL
Figure 12. AD8538 Output Saturation Voltage vs. Temperature Figure 15. AD8538 CMRR vs. Frequency
100
0
100 1M
06741-014
FREQUENCY (Hz)
PSRR (dB)
20
40
60
80
1k 10k 100k
V
SY
= ±2.5V AND ±1.35V
T
A
= 25°C
+PSRR
–PSRR
60
–20
1k 10k 100k 1M
06741-011
FREQUENCY (Hz)
CLOSED-LOOP GAIN (dB)
0
20
40
V
SY
= 5V AND 2.7V
C
L
= 20pF
R
L
= 2kΩ
A
V
= 10
A
V
= 100
A
V
= 1
Figure 16. AD8538 PSRR vs. Frequency
Figure 13. AD8538 Closed-Loop Gain vs. Frequency
AD8538/AD8539
Rev. A | Page 10 of 24
TIME (4µs/DIV)
VOLTAGE (1V/DIV)
06741-017
V
SY
= 5V
A
V
= 1
C
L
= 300pF
R
L
= 10kΩ
1000
0.01
1
0.1
10
100
100 1k 10k 100k 1M
06741-022
FREQUENCY (Hz)
OUTPUT IMPEDANCE (Ω)
V
SY
= 5V AND 2.7V
A
V
= 1
A
V
= 10
A
V
= 100
Figure 20. AD8538 Large Signal Transient Response
Figure 17. AD8538 Closed-Loop Output Impedance vs. Frequency
TIME (10µs/DIV)
06741-018
V
SY
= 5V
A
V
=–50
V
OUT
(V) V
IN
(mV)
100
0
0
–2.5
60
0
1 1000
06741-015
LOAD CAPACITANCE (pF)
SMALL SIGNAL OVERSHOOT (%)
10
20
30
40
50
10 100
V
SY
= 5V
T
A
= 25°C
R
L
= 2kΩ
OS+
OS–
Figure 21. AD8538 Positive Overload Recovery
Figure 18. AD8538 Small Signal Overshoot vs. Load Capacitance
TIME (10µs/DIV)
VOUT (V) VIN (mV)
06741-019
VSY = 5V
AV =–50
0
–100
2.5
0
TIME (4µs/DIV)
VOLTAGE (50mV/DIV)
06741-016
V
SY
= 5V AND 2.7V
A
V
= 1
C
L
= 300pF
R
L
= 2kΩ
Figure 22. AD8538 Negative Overload Recovery
Figure 19. AD8538 Small Signal Transient Response
AD8538/AD8539
Rev. A | Page 11 of 24
TIME (200µs/DIV)
VOLTAGE (1V/DIV)
06741-023
V
SY
= 5V
A
V
= 1
V
IN
= 6V p-p
R
L
= 10kΩ
V
OUT
V
IN
1000
10
100
10 100 1k 10k
06741-021
FREQUENCY (Hz)
VOLTAGE NOISE DENSITY (nV/√Hz)
V
SY
= 5V
T
A
= 25°C
Figure 25. AD8538 No Phase Reversal
Figure 23. AD8538 Voltage Noise Density
TIME (1s/DIV)
VOLTAGE (500nV/DIV)
06741-020
V
SY
= 5V AND 2.7V
Figure 24. AD8538 0.1 Hz to 10 Hz Input Voltage Noise
AD8538/AD8539
Rev. A | Page 12 of 24
V = 2.7 V or ±1.35 V, AD8538 only, unless otherwise noted.
SY
10000
0.1
0.001 1
06741-027
LOAD CURRENT (mA)
OUTPUT SATURATION VOLTAGE (mV)
1
10
100
1000
0.01 0.1
SINK
SOURCE
V
SY
= 2.7V
T
A
= 25°C
180
0
06741-024
INPUT OFFSET VOLTAGE (µV)
NUMBER OF AMPLIFIERS
20
40
60
80
100
120
140
160
–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
V
SY
= 2.7V
0V < V
CM
< 2.7V
T
A
= 25°C
Figure 26. AD8538 Input Offset Voltage Distribution Figure 29. AD8538 Output Saturation Voltage vs. Load Current
35
0
06741-025
TCV
OS
(µV/°C)
NUMBER OF AMPLIFIERS
5
10
15
20
25
30
0 0.012 0.024 0.036 0.048 0.060 0.072 0.084 0.096
V
SY
= 2.7V
–40°C < T
A
< +125°C
30
0
–40 125
06741-028
TEMPERATURE (°C)
OUTPUT SATURATION VOLTAGE (mV)
5
10
15
20
25
–25–105 203550658095110
V
SY
= 2.7V
R
L
= 10kΩ
V
SY
= VOH
VOL
Figure 30. AD8538 Output Saturation Voltage vs. Temperature
Figure 27. AD8538 Input Offset Voltage Drift Distribution
10
–10
02
06741-026
INPUT COMMON-MODE VOLTAGE (V)
INPUT OFFSET VOLTAGE (µV)
.5
–8
–6
–4
–2
0
2
4
6
8
0.5 1.0 1.5 2.0
V
SY
= 2.7V
T
A
= 25°C
80
0
1 1000
06741-029
LOAD CAPACITANCE (pF)
SMALL SIGNAL OVERSHOOT (%)
10
20
30
40
50
60
70
10 100
OS+
OS–
V
SY
= 2.7V
T
A
= 25°C
R
L
= 2kΩ
Figure 31. AD8538 Small Signal Overshoot vs. Load Capacitance
Figure 28. AD8538 Input Offset Voltage vs. Input Common-Mode Voltage
AD8538/AD8539
Rev. A | Page 13 of 24
TIME (4µs/DIV)
VOLTAGE (500mV/DIV)
06741-030
V
SY
= 2.7V
A
V
= 1
C
L
= 100pF
R
L
= 10kΩ
1000
10
100
10 100 1k 10k 100k
06741-032
FREQUENCY (Hz)
VOLTAGE NOISE DENSITY (nV/√Hz)
V
SY
= 2.7V
T
A
= 25°C
Figure 32. AD8538 Large Signal Transient Response Figure 33. AD8538 Voltage Noise Density
AD8538/AD8539
Rev. A | Page 14 of 24
AD8539 CHARACTERISTICS
AD8539 only, VS = 5 V or ±2.5 V, unless otherwise noted.
06741-035
–10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10
V
OS
(µV)
800
700
600
500
400
300
200
100
0
NUMBER OF AMPLIFIERS
AD8539
V
SY
= 5V
0 < V
CM
< 5V
T
A
= 25°C
5 25 45 65 85 105 125
TEMPERATURE (°C)
1000.0
100.0
10.0
1.0
0.1
0.01
INPUT BIAS CURRENT (pA)
06741-038
AD8539
V
SY
= 5V
Figure 34. AD8539 Input Offset Voltage Distribution Figure 37. AD8539 Input Bias Current vs. Temperature
0 0.016 0.032 0.048 0.064 0.080 0.096
TCV
OS
(µV)
60
50
40
30
20
10
0
NUMBER OF AMPLIFIERS
AD8539
V
SY
= ±2.5V
–40°C < V
CM
< 125°C
06741-036
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
VSY (V)
400
350
300
250
200
150
100
50
0
ISY (µA)
AD8539
VSY = 0V TO 5V
–40°C < TA < +125°C
06741-039
+125°C
–40°C
+85°C
+25°C
Figure 35. AD8539 Input Offset Voltage Drift Distribution Figure 38. AD8539 Supply Current vs. Supply Voltage
20
10
0
–10
–20
V
OS
(µV)
012345
V
CM
(V)
06741-037
AD8539
V
SY
= 5V
0V < V
CM
< 5V
T
A
= 25°C
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
400
375
350
325
300
275
250
225
200
I
SY
(µA)
AD8539
V
SY
= ±2.5V
V
SY
= ±1.35V
06741-040
Figure 39. AD8539 Supply Current vs. Temperature
Figure 36. AD8539 Input Offset Voltage vs. Input Common-Mode Voltage
AD8538/AD8539
Rev. A | Page 15 of 24
06741-044
120
100
80
60
40
20
0
–20
–40
–60
–80
–100
–120
GAIN (Degrees)
120
100
80
60
40
20
0
–20
–40
–60
–80
–100
–120
PHASE (Degrees)
1k 10k 100k 1M 10M
FREQUENCY (Hz)
AD8539
V
SY
= ±2.5V
R
L
= 2kΩ
C
L
= 20pF
06741-041
AD8539
10000
1000
100
10
1
0.1
OUTPUT SATURATION VOLTAGE (mV)
0.001 0.01 0.1 1 10 100
ILOAD (mA)
SINK, VS = ± 1.35V
SOURCE, VS = ± 2.5V
SOURCE, VS = ± 1.35V
SINK, VS = ± 2.5V
Figure 40. AD8539 Output Saturation Voltage vs. Load Current Figure 43. AD8539 Open-Loop Gain and Phase vs. Frequency
06741-045
140
120
100
80
60
40
20
0
CMRR (dB)
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
CHANNEL B
CHANNEL A
AD8539
V
SY
= ±2.5V
35
30
25
20
15
10
5
0
OUTPUT SATURATION VOLTAGE (mV)
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
06741-042
AD8539
V
S
= 5V
V
DD
- V
OH
, I
L
= 250µA, R
L
= 10kΩ
V
DD
- V
OH
, I
L
= 25µA, R
L
= 100kΩ
V
OL
, I
L
= 250µA, R
L
= 10kΩ
V
OL
, I
L
= 25µA, R
L
= 100kΩ
Figure 44. AD8539 CMRR vs. Frequency
Figure 41. AD8539 Output Saturation Voltage vs. Temperature
06741-043
60
40
20
0
–20
–40
CLOSED-LOOP GAIN (dB)
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
A
V
= 100
A
V
= 10
A
V
= 1
AD8539
V
SY
= ±2.5V
R
L
= 2kΩ
C
L
= 20pF
06741-046
120
100
80
60
40
20
0
–20
PSRR (dB)
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
PSRR–
AD8539
V
SY
= ±2.5V
PSRR+
Figure 45. AD8539 PSRR vs. Frequency
Figure 42. AD8539 Closed-Loop Gain vs. Frequency
AD8538/AD8539
Rev. A | Page 16 of 24
06741-050
TIME (4µs/DIV)
VOLTAGE (1V/DIV)
AD8539
V
SY
= 5V
A
V
= 1
C
L
= 300pF
R
L
= 10kΩ
06741-047
1000
900
800
700
600
500
400
300
200
100
0.01
Z
OUT
(Ω)
100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
AD8539
V
SY
= ±2.5V
A
V
= 100 A
V
= 10 A
V
= 1
Figure 46. AD8539 Closed-Loop Output Impedance vs. Frequency Figure 49. AD8539 Large Signal Transient Response
06741-048
60
50
40
30
20
10
0
OVERSHOOT (%)
1 10 100 1k
CAPACITANCE (pF)
OS–
OS+
AD8539
V
SY
= ±2.5V
R
L
= 2kΩ
06741-051
INPUT VOLTAGE
OUTPUT VOLTAGE
AD8539
V
SY
= ±2.5V
A
V
= –50
0.15
0.10
0.05
0
–0.05
–0.10
–0.15
–0.20
–0.25
INPUT VOLTAGE (50mV/DIV)
5
4
3
2
1
0
–1
–2
–3
OUTPUT VOLTAGE (1V/DIV)
TIME (20µs/DIV)
Figure 50. AD8539 Positive Overload Recovery
Figure 47. AD8539 Small Signal Overshoot vs. Load Capacitance
06741-049
TIME (2µs/DIV)
VOLTAGE (50mV/DIV)
AD8539
V
SY
= 5V
A
V
= 1
C
L
= 300pF
R
L
= 2kΩ
06741-052
INPUT VOLTAGE
OUTPUT VOLTAGE
AD8539
V
SY
= ±2.5V
A
V
= –50
0.05
0
–0.05
–0.10
–0.15
–0.20
–0.25
–0.30
–0.35
INPUT VOLTAGE (50mV/DIV)
7.5
6.5
5.5
4.5
3.5
2.5
1.5
0.5
–0.5
OUTPUT VOLTAGE (5V/DIV)
TIME (20µs/DIV)
Figure 48. AD8539 Small Signal Transient Response Figure 51. AD8539 Negative Overload Recovery
AD8538/AD8539
Rev. A | Page 17 of 24
06741-055
INPUT VOLTAGE
OUTPUT
VOLTAGE
AD8539
V
SY
= ±2.5V
A
V
= 1
R
L
= 10kΩ
VOLTAGE (2V/DIV)
TIME (200µs/DIV)
06741-053
1k
100
10
100 1k 10k 100k
FREQUENCY (Hz)
AD8539
V
SY
= ±2.5V
VOLTAGE NOISE DENSITY (nV Hz)
Figure 52. AD8539 Voltage Noise Density Figure 54. AD8539 No Phase Reversal
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
VOLTAGE (200mV/DIV)
–5 –4 –3 –2 –1 0 1 2 3 4 5
TIME (1s/DIV)
AD8539
VSY = 5V
AV = 1M
06741-054
06741-056
0
–20
–40
100 1k 10k 100k
FREQUENCY (Hz)
CHANNEL SEPARATION (dB)
–60
–80
–100
–120
–140
–160
AD8539
V
SY
= ±2.5V
Figure 55. AD8539 Channel Separation vs. Frequency
Figure 53. AD8539 0.1 Hz to 10 Hz Input Voltage Noise
AD8538/AD8539
Rev. A | Page 18 of 24
V = 2.7 V or ±1.35 V, T = 25°C, AD8539 only, unless otherwise noted.
S A
06741-057
–10 –9 –8 –7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7 8 9 10
V
OS
350
300
250
200
150
100
50
0
NUMBER OF AMPLIFIERS
AD8539
V
SY
= 2.7V
0V < V
CM
< 2.7V
T
A
= 25°C
06741-060
–40 –25 –10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
35
30
25
20
15
10
5
0
OUTPUT SATURATION VOLTAGE (mV)
AD8539
V
SY
= 2.7V
V
DD
– V
OH
, R
L
= 10kΩ
V
DD
– V
OH
, R
L
= 100kΩ
V
OL
, R
L
= 10kΩ
V
OL
, R
L
= 100kΩ
Figure 56. AD8539 Input Offset Voltage Distribution Figure 59. AD8539 Output Saturation Voltage vs. Temperature
0 0.016 0.032 0.048 0.064 0.080 0.096
TCV
OS
(µV)
45
40
35
30
25
20
15
10
5
0
NUMBER OF AMPLIFIERS
06741-058
AD8539
V
SY
= ±1.35V
–40°C < T
A
< +125°C
06741-061
60
70
80
50
40
30
20
10
0
OVERSHOOT (%)
1 10 100 1k
CAPACITANCE (pF)
OS+
AD8539
V
SY
= ±1.35V
R
L
= 2kΩ
OS–
Figure 57. AD8539 Input Offset Voltage Drift Distribution Figure 60. AD8539 Small Signal Overshoot vs. Load Capacitance
06741-062
TIME (4µs/DIV)
VOLTAGE (500mV/DIV)
AD8539
V
SY
= ±1.35V
A
V
= 1
C
L
= 300pF
R
L
= 10kΩ
20
15
10
5
0
–5
–10
–15
–20
V
OS
(µV)
0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7
V
CM
(V)
AD8539
V
SY
= 2.7V
0V < V
CM
< 2.7V
T
A
= 25°C
06741-059
Figure 61. AD8539 Large Signal Transient Response
Figure 58. AD8539 Input Offset Voltage vs. Input Common-Mode Voltage
AD8538/AD8539
Rev. A | Page 19 of 24
06741-063
1k
100
10
100 1k 10k 100k
FREQUENCY (Hz)
AD8539
V
SY
= ±1.35V
VOLTAGE NOISE DENSITY (nV/ Hz)
06741-064
0
–20
–40
100 1k 10k 100k
FREQUENCY (Hz)
CHANNEL SEPARATION (dB)
–60
–80
–100
–120
–140
–160
AD8539
V
SY
= ±1.35V
Figure 62. AD8539 Voltage Noise Density Figure 63. AD8539 Channel Separation vs. Frequency
AD8538/AD8539
Rev. A | Page 20 of 24
OUTLINE DIMENSIONS
*COMPLIANT TO JEDEC STANDARDS MO-193-AB WITH
THE EXCEPTION OF PACKAGE HEIGHT AND THICKNESS.
PIN 1
1.60 BSC 2.80 BSC
1.90
BSC
0.95 BSC
0.20
0.08
0.60
0.45
0.30
8°
4°
0°
0.50
0.30
0.10 MAX SEATING
PLANE
*1.00 MAX
*0.90
0.87
0.84
2.90 BSC
54
123
Figure 64. 5-Lead Thin Small Outline Transistor Package [TSOT-23]
(UJ-5)
Dimensions shown in millimeters
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 MS-012-A A
012407-A
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
0.50 (0.0196)
0.25 (0.0099) 45°
8°
0°
1.75 (0.0688)
1.35 (0.0532)
SEATING
PLANE
0.25 (0.0098)
0.10 (0.0040)
4
1
85
5.00 (0.1968)
4.80 (0.1890)
4.00 (0.1574)
3.80 (0.1497)
1.27 (0.0500)
BSC
6.20 (0.2441)
5.80 (0.2284)
0.51 (0.0201)
0.31 (0.0122)
COPLANARITY
0.10
Figure 65. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
AD8538/AD8539
Rev. A | Page 21 of 24
COMPLIANT TO JEDEC STANDARDS MO-187-AA
0.80
0.60
0.40
8°
0°
4
8
1
5
PIN 1
0.65 BSC
SEATING
PLANE
0.38
0.22
1.10 MAX
3.20
3.00
2.80
COPLANARITY
0.10
0.23
0.08
3.20
3.00
2.80
5.15
4.90
4.65
0.15
0.00
0.95
0.85
0.75
Figure 66. 8-Lead Mini Small Outline Package [MSOP]
(RM-8)
Dimensions shown in millimeters
ORDERING GUIDE
Model Temperature Range Package Description Package Option Branding
AD8538AUJZ-R2 −40°C to +125°C 5-Lead TSOT-23 UJ-5 A0C
1
AD8538AUJZ-REEL −40°C to +125°C 5-Lead TSOT-23 UJ-5 A0C
1
AD8538AUJZ-REEL7 −40°C to +125°C 5-Lead TSOT-23 UJ-5 A0C
1
AD8538ARZ −40°C to +125°C 8-Lead SOIC_N R-8
1
AD8538ARZ-REEL −40°C to +125°C 8-Lead SOIC_N R-8
1
AD8538ARZ-REEL7 −40°C to +125°C 8-Lead SOIC_N R-8
1
AD8539ARMZ-R2 −40°C to +125°C 8-Lead MSOP RM-8 A1S
1
AD8539ARMZ-REEL −40°C to +125°C 8-Lead MSOP RM-8 A1S
1
AD8539ARZ −40°C to +125°C 8-Lead SOIC_N R-8
1
AD8539ARZ-REEL −40°C to +125°C 8-Lead SOIC_N R-8
1
AD8539ARZ-REEL7 −40°C to +125°C 8-Lead SOIC_N R-8
1
1 Z = RoHS Compliant Part.
AD8538/AD8539
Rev. A | Page 22 of 24
NOTES
AD8538/AD8539
Rev. A | Page 23 of 24
NOTES
AD8538/AD8539
Rev. A | Page 24 of 24
NOTES
©2005–2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06741-0-5/07(A)
