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General-Purpose CMOS
Rail-to-Rail Amplifiers
AD8541/AD8542/AD8544
FEATURES
Single-supply operation: 2.7 V to 5.5 V
Low supply current: 45 μA/amplifier
Wide bandwidth: 1 MHz
No phase reversal
Low input currents: 4 pA
Unity gain stable
Rail-to-rail input and output
PIN CONFIGURATIONS
AD8541
OUT A 1
V– 2
+IN A 3
5 V+
4 –IN A
Figure 1. 5-Lead SC70 and 5-Lead SOT-23
(KS and RJ Suffixes)
APPLICATIONS
ASIC input or output amplifiers
Sensor interfaces
Piezoelectric transducer amplifiers
Medical instrumentation
Mobile communications
Audio outputs
Portable systems
NC 1
–IN A
2
AD8541
8
7
6
5
NC
V+
OUT A
00935-002
+IN A 3
V–
4
NC
NC = NO CONNECT
Figure 2. 8-Lead SOIC
(R Suffix)
GENERAL DESCRIPTION
The AD8541/AD8542/AD8544 are single, dual, and quad rail-
to-rail input and output, single-supply amplifiers featuring very
low supply current and 1 MHz bandwidth. All are guaranteed to
operate from a 2.7 V single supply as well as a 5 V supply. These
parts provide 1 MHz bandwidth at a low current consumption
of 45 μA per amplifier.
Very low input bias currents enable the AD8541/AD8542/AD8544
to be used for integrators, photodiode amplifiers, piezoelectric
sensors, and other applications with high source impedance.
The supply current is only 45 μA per amplifier, ideal for battery
operation.
Rail-to-rail inputs and outputs are useful to designers buffering
ASICs in single-supply systems. The AD8541/AD8542/AD8544
are optimized to maintain high gains at lower supply voltages,
making them useful for active filters and gain stages.
The AD8541/AD8542/AD8544 are specified over the extended
industrial temperature range (–40°C to +125°C). The AD8541
is available in 5-lead SOT-23, 5-lead SC70, and 8-lead SOIC
packages. The AD8542 is available in 8-lead SOIC, 8-lead MSOP,
and 8-lead TSSOP surface-mount packages. The AD8544 is
available in 14-lead narrow SOIC and 14-lead TSSOP surface-
mount packages. All MSOP, SC70, and SOT versions are available
in tape and reel only.
OUT A
–IN A
+IN A
V–
1
2
3
4
AD8542
8
7
6
5
V+
OUT B
–IN B
+IN B
00935-003
00935-004
Figure 3. 8-Lead SOIC, 8-Lead MSOP, and 8-Lead TSSOP
(R, RM, and RU Suffixes)
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
1
2
3
4
5
6
7
14 OUT D
13 –IN D
12 +IN D
AD8544
11 V–
10 +IN C
9
8
–IN C
OUT C
Figure 4. 14-Lead SOIC and 14-Lead TSSOP
(R and RU Suffixes)
Rev. F
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
©2008 Analog Devices, Inc. All rights reserved.
00935-001
AD8541/AD8542/AD8544
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics............................................................. 3
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution.................................................................................. 6
Typical Performance Characteristics ..............................................7
Theory of Operation ...................................................................... 13
Notes on the AD854x Amplifiers............................................. 13
Applications..................................................................................... 14
Notch Filter ................................................................................. 14
Comparator Function ................................................................ 14
Photodiode Application ............................................................ 15
Outline Dimensions ....................................................................... 16
Ordering Guide .......................................................................... 18
REVISION HISTORY
1/08—Rev. E to Rev. F
Inserted Figure 21; Renumbered Sequentially.............................. 9
Changes to Figure 22 Caption......................................................... 9
Changes to Notch Filter Section, Figure 35, Figure 36, and
Figure 37 .......................................................................................... 13
Updated Outline Dimensions ....................................................... 16
1/07—Rev. D to Rev. E
Updated Format..................................................................Universal
Changes to Photodiode Application Section .............................. 14
Changes to Ordering Guide .......................................................... 17
8/04—Rev. C to Rev. D
Changes to Ordering Guide .............................................................5
Changes to Figure 3........................................................................ 10
Updated Outline Dimensions....................................................... 12
1/03—Rev. B to Rev. C
Updated Format..................................................................Universal
Changes to General Description .....................................................1
Changes to Ordering Guide .............................................................5
Changes to Outline Dimensions .................................................. 12
Rev. F | Page 2 of 20
AD8541/AD8542/AD8544
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
V
S
= 2.7 V, V
CM
= 1.35 V, T
A
= 25°C, unless otherwise noted.
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
Symbol
V
OS
−40°C ≤ T
A
≤ +125°C
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
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
CMRR
A
VO
V
CM
= 0 V to 2.7 V
−40°C ≤ T
A
≤ +125°C
R
L
= 100 kΩ, V
O
= 0.5 V to 2.2 V
−40°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
I
L
= 1 mA
−40°C ≤ T
A
≤ +125°C
I
L
= 1 mA
−40°C ≤ T
A
≤ +125°C
V
OUT
= V
S
− 1 V
f = 200 kHz, A
V
= 1
V
S
= 2.5 V to 6 V
−40°C ≤ T
A
≤ +125°C
V
O
= 0 V
−40°C ≤ T
A
≤ +125°C
R
L
= 100 kΩ
To 0.1% (1 V step)
65
60
0
40
38
100
50
2
45
500
0.1
4
Conditions
Min
Typ
1
Max
6
7
60
100
1000
30
50
500
2.7
Unit
mV
mV
pA
pA
pA
pA
pA
pA
V
dB
dB
V/mV
V/mV
V/mV
μV/°C
fA/°C
fA/°C
fA/°C
V
V
mV
mV
mA
mA
Ω
dB
dB
μA
μA
V/μs
μs
kHz
Degrees
Offset Voltage Drift
Bias Current Drift
Offset Current Drift
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
ΔV
OS
/ΔT
ΔI
B
/ΔT
ΔI
OS
/ΔT
V
OH
V
OL
I
OUT
I
SC
Z
OUT
PSRR
I
SY
4
100
2000
25
2.575
2.550
2.65
35
15
±20
50
76
38
55
75
100
125
SR
t
S
GBP
Φ
M
e
n
e
n
i
n
0.4
0.75
5
980
63
f = 1 kHz
f = 10 kHz
40
38
<0.1
nV/√Hz
nV/√Hz
pA/√Hz
Rev. F | Page 3 of 20
AD8541/AD8542/AD8544
V
S
= 3.0 V, V
CM
= 1.5 V, T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
Symbol
V
OS
−40°C ≤ T
A
≤ +125°C
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
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
CMRR
A
VO
V
CM
= 0 V to 3 V
−40°C ≤ T
A
≤ +125°C
R
L
= 100 kΩ, V
O
= 0.5 V to 2.2 V
−40°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +85°C
−40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C
I
L
= 1 mA
−40°C ≤ T
A
≤ +125°C
I
L
= 1 mA
−40°C ≤ T
A
≤ +125°C
V
OUT
= V
S
− 1 V
f = 200 kHz, A
V
= 1
V
S
= 2.5 V to 6 V
−40°C ≤ T
A
≤ +125°C
V
O
= 0 V
−40°C ≤ T
A
≤ +125°C
R
L
= 100 kΩ
To 0.01% (1 V step)
65
60
0
40
38
100
50
2
45
500
0.1
4
Conditions
Min
Typ
1
Max
6
7
60
100
1000
30
50
500
3
Unit
mV
mV
pA
pA
pA
pA
pA
pA
V
dB
dB
V/mV
V/mV
V/mV
μV/°C
fA/°C
fA/°C
fA/°C
V
V
mV
mV
mA
mA
Ω
dB
dB
μA
μA
V/μs
μs
kHz
Degrees
nV/√Hz
nV/√Hz
pA/√Hz
Offset Voltage Drift
Bias Current Drift
Offset Current Drift
OUTPUT CHARACTERISTICS
Output Voltage High
Output Voltage Low
Output Current
Closed-Loop Output Impedance
POWER SUPPLY
Power Supply Rejection Ratio
Supply Current/Amplifier
DYNAMIC PERFORMANCE
Slew Rate
Settling Time
Gain Bandwidth Product
Phase Margin
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
ΔV
OS
/ΔT
ΔI
B
/ΔT
ΔI
OS
/ΔT
V
OH
V
OL
I
OUT
I
SC
Z
OUT
PSRR
I
SY
4
100
2000
25
2.875
2.850
2.955
32
18
±25
50
76
40
60
75
100
125
SR
t
S
GBP
Φ
M
e
n
e
n
i
n
0.4
0.8
5
980
64
42
38
<0.1
f = 1 kHz
f = 10 kHz
Rev. F | Page 4 of 20
