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Low Cost, 250 mA Output,
Single-Supply Amplifiers
AD8531/AD8532/AD8534
FEATURES
Single-supply operation: 2.7 V to 6 V
High output current: ±250 mA
Low supply current: 750 μA/amplifier
Wide bandwidth: 3 MHz
Slew rate: 5 V/μs
No phase reversal
Low input currents
Unity gain stable
Rail-to-rail input and output
PIN CONFIGURATIONS
OUT A
1
V–
2
+IN A
3
4
AD8531
5
V+
–IN A
Figure 1. 5-Lead SC70 and 5-Lead SOT-23
(KS and RJ Suffixes)
NC
1
AD8531
8
7
6
5
NC
V+
OUT A
01099-002
01099-004
APPLICATIONS
Multimedia audio
LCD drivers
ASIC input or output amplifiers
Headphone drivers
–IN A
2
+IN A
3
V–
4
NC
NC = NO CONNECT
Figure 2. 8-Lead SOIC
(R Suffix)
GENERAL DESCRIPTION
The AD8531, AD8532, and AD8534 are single, dual, and quad
rail-to-rail input/output single-supply amplifiers featuring
250 mA output drive current. This high output current makes
these amplifiers excellent for driving either resistive or capacitive
loads. AC performance is very good with 3 MHz bandwidth,
5 V/μs slew rate, and low distortion. All are guaranteed to operate
from a 3 V single supply as well as a 5 V supply.
The very low input bias currents enable the AD853x to be used for
integrators, diode amplification, and other applications requiring
low input bias current. Supply current is only 750 μA per
amplifier at 5 V, allowing low current applications to control
high current loads.
Applications include audio amplification for computers, sound
ports, sound cards, and set-top boxes. The AD853x family is
very stable, and it is capable of driving heavy capacitive loads
such as those found in LCDs.
The ability to swing rail-to-rail at the inputs and outputs enables
designers to buffer CMOS DACs, ASICs, or other wide output
swing devices in single-supply systems.
The AD8531/AD8532/AD8534 are specified over the extended
industrial temperature range (−40°C to +85°C). The AD8531 is
available in 8-lead SOIC, 5-lead SC70, and 5-lead SOT-23 packages.
The AD8532 is available in 8-lead SOIC, 8-lead MSOP, and 8-lead
TSSOP surface-mount packages. The AD8534 is available in
narrow 14-lead SOIC and 14-lead TSSOP surface-mount
packages.
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.
OUT A
1
–IN A
+IN A
V–
2
3
4
8
7
6
5
V+
OUT B
–IN B
+IN B
01099-003
AD8532
Figure 3. 8-Lead SOIC, 8-Lead TSSOP, and 8-Lead MSOP
(R, RU, and RM Suffixes)
OUT A
1
–IN A
+IN A
V+
2
3
4
14
OUT D
13
–IN D
12
+IN D
AD8534
11
V–
10
+IN C
9
8
+IN B
5
–IN B
OUT B
6
7
–IN C
OUT C
Figure 4. 14-Lead SOIC and 14-Lead TSSOP
(R and RU Suffixes)
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 ©1996–2008 Analog Devices, Inc. All rights reserved.
01099-001
AD8531/AD8532/AD8534
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics............................................................. 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ...................................................................... 11
Short-Circuit Protection............................................................ 11
Power Dissipation....................................................................... 11
Power Calculations for Varying or Unknown Loads............. 12
Calculating Power by Measuring Ambient and Case
Temperature ................................................................................ 12
Calculating Power by Measuring Supply Current ................. 12
Input Overvoltage Protection ................................................... 12
Output Phase Reversal............................................................... 13
Capacitive Load Drive ............................................................... 13
Applications Information .............................................................. 14
High Output Current, Buffered Reference/Regulator........... 14
Single-Supply, Balanced Line Driver ....................................... 14
Single-Supply Headphone Amplifier....................................... 15
Single-Supply, 2-Way Loudspeaker Crossover Network....... 15
Direct Access Arrangement for Telephone Line Interface ... 16
Outline Dimensions ....................................................................... 17
Ordering Guide .......................................................................... 20
REVISION HISTORY
1/08—Rev. E to Rev. F
Changes to Layout ............................................................................ 5
Changes to Figure 12 and Figure 13............................................... 7
Changes to Figure 38...................................................................... 11
Changes to Input Overvoltage Protection Section..................... 12
Changes to Figure 43...................................................................... 14
Updated Outline Dimensions ....................................................... 17
Changes to Ordering Guide .......................................................... 20
4/05—Rev. D to Rev. E
Updated Format..................................................................Universal
Changes to Pin Configurations....................................................... 1
Changes to Table 4............................................................................ 5
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 19
10/02—Rev. C to Rev. D
Deleted 8-Lead PDIP (N-8) .............................................. Universal
Deleted 14-Lead PDIP (N-14) .......................................... Universal
Edits to Figure 34...............................................................................9
Updated Outline Dimensions ........................................................15
8/96—Revision 0: Initial Version
Rev. F | Page 2 of 20
AD8531/AD8532/AD8534
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
V
S
= 3.0 V, V
CM
= 1.5 V, T
A
= 25°C, unless otherwise noted.
Table 1.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
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
Channel Separation
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
Symbol
V
OS
−40°C ≤ T
A
≤ +85°C
I
B
−40°C ≤ T
A
≤ +85°C
I
OS
−40°C ≤ T
A
≤ +85°C
CMRR
A
VO
ΔV
OS
/ΔT
ΔI
B
/ΔT
ΔI
OS
/ΔT
V
OH
V
OL
I
OUT
Z
OUT
PSRR
I
SY
V
CM
= 0 V to 3 V
R
L
= 2 kΩ, V
O
= 0.5 V to 2.5 V
0
38
45
25
20
50
20
2.92
60
±250
60
45
55
0.70
100
125
1
5
Conditions
Min
Typ
Max
25
30
50
60
25
30
3
Unit
mV
mV
pA
pA
pA
pA
V
dB
V/mV
μV/°C
fA/°C
fA/°C
V
V
mV
mV
mA
Ω
dB
mA
mA
V/μs
μs
MHz
Degrees
dB
nV/√Hz
nV/√Hz
pA/√Hz
I
L
= 10 mA
−40°C ≤ T
A
≤ +85°C
I
L
= 10 mA
−40°C ≤ T
A
≤ +85°C
f = 1 MHz, A
V
= 1
V
S
= 3 V to 6 V
V
O
= 0 V
−40°C ≤ T
A
≤ +85°C
R
L
= 2 kΩ
To 0.01%
2.85
2.8
1
1.25
SR
t
S
GBP
фo
CS
e
n
i
n
f = 1 kHz, R
L
= 2 kΩ
f = 1 kHz
f = 10 kHz
f = 1 kHz
3.5
1.6
2.2
70
65
45
30
0.05
Rev. F | Page 3 of 20
AD8531/AD8532/AD8534
V
S
= 5.0 V, V
CM
= 2.5 V, T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
INPUT CHARACTERISTICS
Offset Voltage
Input Bias Current
Input Offset Current
Input Voltage Range
Common-Mode Rejection Ratio
Large Signal Voltage Gain
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
Full-Power Bandwidth
Settling Time
Gain Bandwidth Product
Phase Margin
Channel Separation
NOISE PERFORMANCE
Voltage Noise Density
Current Noise Density
Symbol
V
OS
−40°C ≤ T
A
≤ +85°C
I
B
−40°C ≤ T
A
≤ +85°C
I
OS
−40°C ≤ T
A
≤ +85°C
CMRR
A
VO
ΔV
OS
/ΔT
ΔI
B
/ΔT
ΔI
OS
/ΔT
V
OH
V
OL
I
OUT
Z
OUT
PSRR
I
SY
V
CM
= 0 V to 5 V
R
L
= 2 kΩ, V
O
= 0.5 V to 4.5 V
−40°C ≤ T
A
≤ +85°C
0
38
15
47
80
20
50
20
4.94
50
±250
40
45
55
0.75
100
125
1
5
Conditions
Min
Typ
Max
25
30
50
60
25
30
5
Unit
mV
mV
pA
pA
pA
pA
V
dB
V/mV
μV/°C
fA/°C
fA/°C
V
V
mV
mV
mA
Ω
dB
mA
mA
V/μs
kHz
μs
MHz
Degrees
dB
nV/√Hz
nV/√Hz
pA/√Hz
I
L
= 10 mA
−40°C ≤ T
A
≤ +85°C
I
L
= 10 mA
−40°C ≤ T
A
≤ +85°C
f = 1 MHz, A
V
= 1
V
S
= 3 V to 6 V
V
O
= 0 V
−40°C ≤ T
A
≤ +85°C
R
L
= 2 kΩ
1% distortion
To 0.01%
4.9
4.85
1.25
1.75
SR
BW
p
t
S
GBP
фo
CS
e
n
i
n
f = 1 kHz, R
L
= 2 kΩ
f = 1 kHz
f = 10 kHz
f = 1 kHz
5
350
1.4
3
70
65
45
30
0.05
Rev. F | Page 4 of 20
Programming Basics
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