Low Cost, 250 mA Output,
O
O
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
APPLICATIONS
Multimedia audio
LCD drivers
ASIC input or output amplifiers
Headphone drivers
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 Anal og Devices for its use, nor for any infringements of patents or ot her
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.
Single-Supply Amplifiers
AD8531/AD8532/AD8534
PIN CONFIGURATIONS
AD8531
1
OUT A
V–
2
3
+IN A
Figure 1. 5-Lead SC70 and 5-Lead SOT-23
(KS and RJ Suffixes)
NC 1
–IN A 2
+IN A
AD8531
3
V– 4
NC = NO CONNECT
Figure 2. 8-Lead SOIC
(R Suffix)
1
OUT A
2
–IN A
3
+IN A
4
V–
AD8532
Figure 3. 8-Lead SOIC, 8-Lead TSSOP, and 8-Lead MSOP
(R, RU, and RM Suffixes)
1
UT A
2
–IN A
3
+IN A
4
V+
+IN B
–IN B
UT B
AD8534
5
6
7
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.
6
5
4
NC8
V+7
OUT A
NC5
8
7
6
5
14
13
12
11
10
9
8
V+
–IN A
V+
OUT B
–IN B
+IN B
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
01099-001
01099-002
01099-003
01099-004
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
Te mp e r at u re ................................................................................ 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
VS = 3.0 V, VCM = 1.5 V, TA = 25°C, unless otherwise noted.
Table 1.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
OS
−40°C ≤ TA ≤ +85°C 30 mV
Input Bias Current I
B
−40°C ≤ TA ≤ +85°C 60 pA
Input Offset Current I
OS
−40°C ≤ TA ≤ +85°C 30 pA
Input Voltage Range 0 3 V
Common-Mode Rejection Ratio CMRR VCM = 0 V to 3 V 38 45 dB
Large Signal Voltage Gain A
VO
Offset Voltage Drift ΔVOS/ΔT 20 μV/°C
Bias Current Drift ΔIB/ΔT 50 fA/°C
Offset Current Drift ΔIOS/ΔT 20 fA/°C
OUTPUT CHARACTERISTICS
Output Voltage High V
OH
−40°C ≤ TA ≤ +85°C 2.8 V
Output Voltage Low V
OL
−40°C ≤ TA ≤ +85°C 125 mV
Output Current I
Closed-Loop Output Impedance Z
OUT
OUT
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 3 V to 6 V 45 55 dB
Supply Current/Amplifier I
SY
−40°C ≤ TA ≤ +85°C 1.25 mA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ 3.5 V/μs
Settling Time t
S
Gain Bandwidth Product GBP 2.2 MHz
Phase Margin фo 70 Degrees
Channel Separation CS f = 1 kHz, RL = 2 kΩ 65 dB
NOISE PERFORMANCE
Voltage Noise Density e
n
f = 10 kHz 30 nV/√Hz
Current Noise Density i
n
25 mV
5 50 pA
1 25 pA
RL = 2 kΩ, VO = 0.5 V to 2.5 V 25 V/mV
IL = 10 mA 2.85 2.92 V
IL = 10 mA 60 100 mV
±250 mA
f = 1 MHz, AV = 1 60 Ω
VO = 0 V 0.70 1 mA
To 0.01% 1.6 μs
f = 1 kHz 45 nV/√Hz
f = 1 kHz 0.05 pA/√Hz
Rev. F | Page 3 of 20
AD8531/AD8532/AD8534
VS = 5.0 V, VCM = 2.5 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
INPUT CHARACTERISTICS
Offset Voltage V
OS
−40°C ≤ TA ≤ +85°C 30 mV
Input Bias Current I
B
−40°C ≤ TA ≤ +85°C 60 pA
Input Offset Current I
OS
−40°C ≤ TA ≤ +85°C 30 pA
Input Voltage Range 0 5 V
Common-Mode Rejection Ratio CMRR VCM = 0 V to 5 V 38 47 dB
Large Signal Voltage Gain A
VO
Offset Voltage Drift ΔVOS/ΔT −40°C ≤ TA ≤ +85°C 20 μV/°C
Bias Current Drift ΔIB/ΔT 50 fA/°C
Offset Current Drift ΔIOS/ΔT 20 fA/°C
OUTPUT CHARACTERISTICS
Output Voltage High V
OH
−40°C ≤ TA ≤ +85°C 4.85 V
Output Voltage Low V
OL
−40°C ≤ TA ≤ +85°C 125 mV
Output Current I
Closed-Loop Output Impedance Z
OUT
OUT
POWER SUPPLY
Power Supply Rejection Ratio PSRR VS = 3 V to 6 V 45 55 dB
Supply Current/Amplifier I
SY
−40°C ≤ TA ≤ +85°C 1.75 mA
DYNAMIC PERFORMANCE
Slew Rate SR RL = 2 kΩ 5 V/μs
Full-Power Bandwidth BW
Settling Time t
p
S
Gain Bandwidth Product GBP 3 MHz
Phase Margin фo 70 Degrees
Channel Separation CS f = 1 kHz, RL = 2 kΩ 65 dB
NOISE PERFORMANCE
Voltage Noise Density e
n
f = 10 kHz 30 nV/√Hz
Current Noise Density i
n
25 mV
5 50 pA
1 25 pA
RL = 2 kΩ, VO = 0.5 V to 4.5 V 15 80 V/mV
IL = 10 mA 4.9 4.94 V
IL = 10 mA 50 100 mV
±250 mA
f = 1 MHz, AV = 1 40 Ω
VO = 0 V 0.75 1.25 mA
1% distortion 350 kHz
To 0.01% 1.4 μs
f = 1 kHz 45 nV/√Hz
f = 1 kHz 0.05 pA/√Hz
Rev. F | Page 4 of 20
AD8531/AD8532/AD8534
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter Rating
Supply Voltage (VS) 7 V
Input Voltage GND to V
Differential Input Voltage
1
±6 V
S
Storage Temperature Range −65°C to +150°C
Operating Temperature Range −40°C to +85°C
Junction Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 60 sec) 300°C
1
For supplies less than 6 V, the differential input voltage is equal to ±VS.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; the functional operation of the device at these or
any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
2.5
–V
OL
2.0
1.5
OUT
±V
1.0
0.5
0
0 20 40 60 80 100 120 140 160 180 200
Figure 5. Output Voltage vs. Load, V
ESD CAUTION
+V
OH
R
LOAD
R
Is Connected to GND (0 V)
LOAD
(Ω)
= ±2.5 V,
S
01099-005
Table 4.
Package Type θ
JA
θ
JC
Unit
5-Lead SC70 (KS) 376 126 °C/W
5-Lead SOT-23 (RJ) 230 146 °C/W
8-Lead SOIC (R) 158 43 °C/W
8-Lead MSOP (RM) 210 45 °C/W
8-Lead TSSOP (RU) 240 43 °C/W
14-Lead SOIC (R) 120 36 °C/W
14-Lead TSSOP (RU) 240 43 °C/W
Rev. F | Page 5 of 20
AD8531/AD8532/AD8534
TYPICAL PERFORMANCE CHARACTERISTICS
VS= 2.7V
= 1.35V
V
CM
= 25°C
T
500
400
300
200
QUANTITY ( Amplifi ers)
100
–12 –10 –8 –6 –4 –2 0 2 4
INPUT OFFSET VOLTAGE (mV)
A
INPUT BIAS CURRENT (pA)
01099-006
Figure 6. Input Offset Voltage Distribution
VS= 5V
= 2.5V
V
CM
= 25°C
T
500
400
300
200
QUANTITY ( Amplifi ers)
100
A
INPUT BIAS CURRENT (pA)
VS= 5V, 3V
V
= VS/2
CM
8
7
6
5
4
3
2
–35 –15 5 25 45 65 85
TEMPERATURE (°C)
Figure 9. Input Bias Current vs. Temperature
VS= 5V
T
= 25°C
A
8
7
6
5
4
3
2
01099-009
–12 –10 –8 –6 –4 –2 0 2 4
INPUT OFFSET VOLTAGE (mV)
Figure 7. Input Offset Voltage Distribution
–2
–3
–4
–5
–6
–7
INPUT OFFSET VOLTAGE (mV)
–8
–35 –15 5 25 45 65 85
TEMPERATURE (°C)
Figure 8. Input Offset Voltage vs. Temperature
VS= 5V
V
= 2.5V
CM
01099-007
01 2 34 5
COMMON-MODE VOLTAGE (V)
01099-010
Figure 10. Input Bias Current vs. Common-Mode Voltage
6
VS= 5V, 3V
= VS/2
V
CM
5
4
3
2
1
0
INPUT OFFSET CURRENT (pA)
–1
01099-008
–2
–35 –15 5 25 45 65 85
TEMPERATURE (°C)
01099-011
Figure 11. Input Offset Current vs. Temperature
Rev. F | Page 6 of 20
AD8531/AD8532/AD8534
1000
VS= 2.7V
= 25°C
T
A
VS= 5V
= NO LOAD
R
L
= 25°C
T
A
100
10
1
ΔOUTPUT VOLTAGE (mV)
0.1
0.01
0.001 0.01 0.1 1 10 100
LOAD CURRENT (mA)
SOURCE
SINK
Figure 12. Output Voltage to Supply Rail vs. Load Current
1000
VS= 5V
= 25°C
T
A
100
10
1
ΔOUTPUT VOLTAGE (mV)
0.1
SOURCE
SINK
80
60
40
GAIN (dB)
20
0
01099-012
1k 10k 100k 1M 10M 100M
FREQUENCY ( Hz)
45
90
135
180
PHASE SHIFT (Degrees)
01099-015
Figure 15. Open-Loop Gain and Phase Shift vs. Frequency
5
VS= 2.7V
= 25°C
T
A
= 2kΩ
R
L
= 2.5V p-p
V
4
IN
3
2
OUTPUT SWING (V p-p)
1
0.01
0.001 0.01 0.1 1 10 100
LOAD CURRENT (mA)
Figure 13. Output Voltage to Supply Rail vs. Load Current
VS= 2.7V
= NO LOAD
R
L
= 25°C
T
A
80
60
40
GAIN (dB)
20
0
1k 10k 100k 1M 10M 100M
FREQUENCY ( Hz)
Figure 14. Open-Loop Gain and Phase Shift vs. Frequency
45
90
135
180
01099-013
0
1k 10k 100k 1M 10M
FREQUENCY ( Hz)
01099-016
Figure 16. Closed-Loop Output Swing vs. Frequency
5
4
3
2
PHASE SHIFT (Degrees)
01099-014
OUTPUT SWING (V p-p)
1
0
1k 10k 100k 1M 10M
FREQUENCY ( Hz)
VS= 5V
= 25°C
T
A
= 2kΩ
R
L
= 4.9V p-p
V
IN
01099-017
Figure 17. Closed-Loop Output Swing vs. Frequency
Rev. F | Page 7 of 20
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