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PDF AD8531 Data sheet ( Hoja de datos )
| Número de pieza | AD8531 | |
| Descripción | Low Cost/ 250 mA Output Single-Supply Amplifiers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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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 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
Low Cost, 250 mA Output,
Single-Supply Amplifiers
AD8531/AD8532/AD8534
PIN CONFIGURATIONS
AD8531
OUT A 1
5 V+
V– 2
+IN A 3
4 –IN A
Figure 1. 5-Lead SC70 and 5-Lead SOT-23
(KS and RJ Suffixes)
NC 1
–IN A 2
+IN A 3
V– 4
AD8531
8 NC
7 V+
6 OUT A
5 NC
NC = NO CONNECT
Figure 2. 8-Lead SOIC
(R Suffix)
OUT A 1
–IN A 2
+IN A 3
V– 4
8 V+
7 OUT B
6 –IN B
5 +IN B
AD8532
Figure 3. 8-Lead SOIC, 8-Lead TSSOP, and 8-Lead MSOP
(R, RU, and RM Suffixes)
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
AD8534
14 OUT D
13 –IN D
12 +IN D
11 V–
10 +IN C
9 –IN C
8 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.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Supply Voltage (VS)
Input Voltage
Differential Input Voltage1
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 sec)
Rating
7V
GND to VS
±6 V
−65°C to +150°C
−40°C to +85°C
−65°C to +150°C
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.
Table 4.
Package Type
5-Lead SC70 (KS)
5-Lead SOT-23 (RJ)
8-Lead SOIC (R)
8-Lead MSOP (RM)
8-Lead TSSOP (RU)
14-Lead SOIC (R)
14-Lead TSSOP (RU)
θJA θJC Unit
376 126 °C/W
230 146 °C/W
158 43 °C/W
210 45 °C/W
240 43 °C/W
120 36 °C/W
240 43 °C/W
AD8531/AD8532/AD8534
2.5
–VOL
2.0 +VOH
1.5
1.0
0.5
0
0 20 40 60 80 100 120 140 160 180
RLOAD (Ω)
Figure 5. Output Voltage vs. Load, VS = ±2.5 V,
RLOAD Is Connected to GND (0 V)
200
ESD CAUTION
Rev. F | Page 5 of 20
5 Page 
THEORY OF OPERATION
The AD8531/AD8532/AD8534 are all CMOS, high output
current drive, rail-to-rail input/output operational amplifiers.
Their high output current drive and stability with heavy capacitive
loads make the AD8531/AD8532/AD8534 excellent choices as
drive amplifiers for LCD panels.
Figure 36 illustrates a simplified equivalent circuit for the
AD8531/AD8532/AD8534. Like many rail-to-rail input amplifier
configurations, it comprises two differential pairs, one N-channel
(M1 to M2) and one P-channel (M3 to M4). These differential
pairs are biased by 50 μA current sources, each with a compliance
limit of approximately 0.5 V from either supply voltage rail. The
differential input voltage is then converted into a pair of
differential output currents. These differential output currents
are then combined in a compound folded-cascade second gain
stage (M5 to M9). The outputs of the second gain stage at M8
and M9 provide the gate voltage drive to the rail-to-rail output
stage. Additional signal current recombination for the output
stage is achieved using M11 to M14.
To achieve rail-to-rail output swings, the AD8531/AD8532/
AD8534 design employs a complementary, common source
output stage (M15 to M16). However, the output voltage swing
is directly dependent on the load current because the difference
between the output voltage and the supply is determined by
the AD8531/AD8532/AD8534’s output transistors on channel
resistance (see Figure 12 and Figure 13). The output stage also
exhibits voltage gain by virtue of the use of common source
amplifiers; as a result, the voltage gain of the output stage (thus,
the open-loop gain of the device) exhibits a strong dependence
on the total load resistance at the output of the AD8531/
AD8532/AD8534.
V+
50µA
100µA
M1 M3
IN–
IN+
VB2
M4 M2
M5
M6
VB3
50µA
M7
100µA
M11
M12
M8
20µA
M9 M14
20µA
M10
M13
M15
OUT
M16
V–
Figure 36. Simplified Equivalent Circuit
AD8531/AD8532/AD8534
SHORT-CIRCUIT PROTECTION
As a result of the design of the output stage for the maximum
load current capability, the AD8531/AD8532/AD8534 do not
have any internal short-circuit protection circuitry. Direct
connection of the output of the AD8531/AD8532/AD8534 to
the positive supply in single-supply applications destroys the
device. In applications where some protection is needed, but not
at the expense of reduced output voltage headroom, a low value
resistor in series with the output, as shown in Figure 37, can be
used. The resistor, connected within the feedback loop of the
amplifier, has very little effect on the performance of the amplifier
other than limiting the maximum available output voltage
swing. For single 5 V supply applications, resistors less than
20 Ω are not recommended.
5V
VIN
RX
20Ω
AD8532
VOUT
Figure 37. Output Short-Circuit Protection
POWER DISSIPATION
Although the AD8531/AD8532/AD8534 are capable of
providing load currents to 250 mA, the usable output load
current drive capability is limited to the maximum power
dissipation allowed by the device package used. In any
application, the absolute maximum junction temperature
for the AD8531/AD8532/AD8534 is 150°C. The maximum
junction temperature should never be exceeded because the
device could suffer premature failure. Accurately measuring
power dissipation of an integrated circuit is not always a
straightforward exercise; therefore, Figure 38 is provided
as a design aid for either setting a safe output current drive
level or selecting a heat sink for the package options available
on the AD8531/AD8532/AD8534.
1.5
TJ MAX = 150°C
FREE AIR
NO HEAT SINK
SOIC
1.0 θJA = 158°C/W
MSOP
θJA = 210°C/W
SOT-23
θJA = 230°C/W
0.5
SC70
θJA = 376°C/W
TSSOP
θJA = 240°C/W
0
0
25
50
75 85
100
TEMPERATURE (°C)
Figure 38. Maximum Power Dissipation vs. Ambient Temperature
Rev. F | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AD8531.PDF ] | |
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