|
|
PDF AD8591 Data sheet ( Hoja de datos )
| Número de pieza | AD8591 | |
| Descripción | Rail-to-Rail Input/Output Operational Amplifiers | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AD8591 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
CMOS Single-Supply, Rail-to-Rail Input/Output
Operational Amplifiers with Shutdown
AD8591/AD8592/AD8594
FEATURES
Single-supply operation: 2.5 V to 6 V
High output current: ±250 mA
Extremely low shutdown supply current: 100 nA
Low supply current: 750 μA/Amp
Wide bandwidth: 3 MHz
Slew rate: 5 V/μs
No phase reversal
Very low input bias current
High impedance outputs when in shutdown mode
Unity-gain stable
APPLICATIONS
Mobile communication handset audio
PC audio
PCMCIA/modem line driving
Battery-powered instrumentation
Data acquisition
ASIC input or output amplifiers
LCD display reference level drivers
GENERAL DESCRIPTION
The AD8591, AD8592, and AD8594 are single, dual, and quad
rail-to-rail, input and output single-supply amplifiers featuring
250 mA output drive current and a power saving shutdown mode.
The AD8592 includes an independent shutdown function for
each amplifier. When both amplifiers are in shutdown mode,
the total supply current is reduced to less than 1 μA. The AD8591
and AD8594 include a single master shutdown function that
reduces the total supply current to less than 1 μA. All amplifier
outputs are in a high impedance state when in shutdown mode.
These amplifiers have very low input bias currents, making them
suitable for integrators and diode amplification. Outputs are stable
with virtually any capacitive load. Supply current is less than
750 μA per amplifier in active mode.
Applications for these amplifiers include audio amplification for
portable computers, portable phone headsets, sound ports, sound
cards, and set-top boxes. The AD859x family is capable of driving
heavy capacitive loads, such as LCD panel reference levels.
The ability to swing rail to rail at both the input and output enables
designers to buffer CMOS DACs, ASICs, and other wide output
swing devices in single-supply systems.
PIN CONFIGURATIONS
OUT A 1
6 V+
AD8591
V– 2 TOP VIEW 5 SD
(Not to Scale)
+IN A 3
4 –IN A
Figure 1. 6-Lead SOT-23 (RJ Suffix)
OUT A 1
–IN A 2
+IN A 3
V– 4
SDA 5
10 V+
AD8592
TOP VIEW
(Not to Scale)
9 OUT B
8 –IN B
7 +IN B
6 SDB
Figure 2. 10-Lead MSOP (RM Suffix)
OUT A 1
16 OUT D
–IN A 2
15 –IN D
+IN A 3 AD8594 14 +IN D
V+ 4 TOP VIEW 13 V–
+IN B 5 (Not to Scale) 12 +IN C
–IN B 6
11 –IN C
OUT B 7
10 OUT C
NC 8
9 SD
NC = NO CONNECT
Figure 3. 16-Lead Narrow SOIC (R Suffix)
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
NC 8
16 OUT D
15 –IN D
AD8594
TOP VIEW
(Not to Scale)
14 +IN D
13 V–
12 +IN C
11 –IN C
10 OUT C
9 SD
NC = NO CONNECT
Figure 4. 16-Lead TSSOP (RU Suffix)
The AD8591, AD8592, and AD8594 are specified over the
industrial temperature range (−40°C to +85°C). The AD8591,
single, is available in the tiny 6-lead SOT-23 package. The AD8592,
dual, is available in the 10-lead surface-mount MSOP package. The
AD8594, quad, is available in 16-lead narrow SOIC and 16-lead
TSSOP packages.
Rev. B
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.
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
©2009 Analog Devices, Inc. All rights reserved.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 3.
Parameter
Supply Voltage
Input Voltage
Differential Input Voltage
Output Short-Circuit Duration to GND1
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 sec)
Rating
6V
GND to VS
±6 V
Observe Derating Curves
−65°C to +150°C
−40°C to +85°C
−65°C to +150°C
300°C
1 For supplies less than ±5 V, the differential input voltage is limited to the
supplies.
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 listed in the operational sections
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
AD8591/AD8592/AD8594
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
6-Lead SOT-23 (RJ)
10-Lead MSOP (RM)
16-Lead SOIC (R)
16-Lead TSSOP (RU)
θJA θJC Unit
230 92 °C/W
200 44 °C/W
120 36 °C/W
180 35 °C/W
ESD CAUTION
Rev. B | Page 5 of 16
5 Page 
AD8591/AD8592/AD8594
THEORY OF OPERATION
The AD859x amplifiers are CMOS, high output drive, rail-to-
rail input and output single-supply amplifiers designed for low
cost and high output current drive. The parts include a power
saving shutdown function that makes the AD8591/AD8592/
AD8594 op amps ideal for portable multimedia and
telecommunications applications.
Figure 33 shows the simplified schematic for the AD8591/AD8592/
AD8594 amplifiers. Two input differential pairs, consisting of
an n-channel pair (M1, M2) and a p-channel pair (M3, M4),
provide a rail-to-rail input common-mode range. The outputs of
the input differential pairs are combined in a compound folded-
cascode stage that drives the input to a second differential pair
gain stage. The outputs of the second gain stage provide the gate
voltage drive to the rail-to-rail output stage.
The rail-to-rail output stage consists of M15 and M16, which
are configured in a complementary common source configuration.
As with any rail-to-rail output amplifier, the gain of the output
stage, and thus the open-loop gain of the amplifier, is dependent
on the load resistance. In addition, the maximum output voltage
swing is directly proportional to the load current. The difference
between the maximum output voltage to the supply rails, known as
the dropout voltage, is determined by the on-channel resistance
of the AD8591/AD8592/AD8594 output transistors. The output
dropout voltage is given in Figure 5 and Figure 6.
100µA
V+
50µA
INV
SD
M1
IN–
M3
IN+
INV
*
* *100µA
*
20µA
M11
M337
M5
M12 M30
M8
VB2
M4 M15
M2
M6
VB3
M9 M14
20µA *
OUT
M16
*50µA M340
M7
M10 M13
M31
V–
*ALL CURRENT SOURCES GO TO 0µA IN SHUTDOWN MODE.
Figure 33. Simplified Schematic
INPUT VOLTAGE PROTECTION
Although not shown in the simplified schematic, ESD protection
diodes are connected from each input to each power supply rail.
These diodes are normally reverse-biased, but turn on if either
input voltage exceeds either supply rail by more than 0.6 V. If this
condition occurs, limit the input current to less than ±5 mA.
This is done by placing a resistor in series with the input(s).
The minimum resistor value should be
RIN
≥
VIN ,MAX
5 mA
(1)
OUTPUT PHASE REVERSAL
The AD8591/AD8592/AD8594 are immune to output voltage
phase reversal with an input voltage within the supply voltages
of the device. However, if either of the inputs of the device exceeds
0.6 V outside of the supply rails, the output could exhibit phase
reversal. This is due to the ESD protection diodes becoming
forward-biased, thus causing the polarity of the input terminals
of the device to switch.
The technique recommended in the Input Voltage Protection
section should be applied in applications where the possibility
of input voltages exceeding the supply voltages exists.
OUTPUT SHORT-CIRCUIT PROTECTION
To achieve high output current drive and rail-to-rail performance,
the outputs of the AD859x family do not have internal short-
circuit protection circuitry. Although these amplifiers are
designed to sink or source as much as 250 mA of output current,
shorting the output directly to the positive supply could damage or
destroy the device. To protect the output stage, limit the maximum
output current to ±250 mA.
By placing a resistor in series with the output of the amplifier,
as shown in Figure 34, the output current can be limited. The
minimum value for RX is
RX
≥
VSY
250 mA
(2)
For a 5 V single-supply application, RX should be at least 20 Ω.
Because RX is inside the feedback loop, VOUT is not affected. The
trade-off in using RX is a slight reduction in output voltage
swing under heavy output current loads. RX also increases the
effective output impedance of the amplifier to RO + RX, where RO
is the output impedance of the device.
+5V
VIN
RX
20Ω
AD8592
VOUT
Figure 34. Output Short-Circuit Protection
POWER DISSIPATION
Although the AD859x amplifiers are able to provide load
currents of up to 250 mA, proper attention should be given to
not exceeding the maximum junction temperature for the device.
The junction temperature equation is
TJ = PDISS × θJA + TA
(3)
where:
TJ is the AD859x junction temperature.
PDISS is the AD859x power dissipation.
θJA is the AD859x junction-to-ambient thermal resistance of the
package.
TA is the ambient temperature of the circuit.
Rev. B | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AD8591.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AD8591 | Rail-to-Rail Input/Output Operational Amplifiers | Analog Devices |
| AD8592 | Rail-to-Rail Input/Output Operational Amplifiers | Analog Devices |
| AD8594 | Rail-to-Rail Input/Output Operational Amplifiers | Analog Devices |
| AD8597 | Ultralow Noise Op Amp | Analog Devices |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |