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參數資料
| 型號： | AD8594ARU |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | CMOS Single Supply Rail-to-Rail Input/Output Operational Amplifiers with Shutdown |
| 中文描述： | QUAD OP-AMP, 30000 uV OFFSET-MAX, 2.2 MHz BAND WIDTH, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數： | 8/15頁 |
| 文件大小： | 227K |
| 代理商： | AD8594ARU |
AD8591/AD8592/AD8594
–8–
REV. A
AD8591/AD8592/AD8594 APPLICATION SECTION
Theory of Operation
The AD859x family of amplifiers are all 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 making the AD8591/AD8592/AD8594
op amps ideal for portable multimedia and telecom applications.
Figure 29 shows the simplified schematic for an AD8591/AD8592/
AD8594 amplifier. 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, which drives the input to a second differential pair gain
stage. The outputs of the second gain stage provide the gate volt-
age 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. Also, the maximum output voltage swing
is directly proportional to the load current. The difference be-
tween the maximum output voltage to the supply rails, known as
the dropout voltage, is determined by the AD8591/AD8592/
AD8594 output transistors’ on-channel resistance. The output
dropout voltage is given in Figure 1 and Figure 2.
50
m
A
100
m
A
100
m
A
20
m
A
V
B2
M5
M8
M12
M15
M16
M11
OUT
M3
M4
M1
IN–
IN+
V
B3
M6
M7
M10
20
m
A
M13
50
m
A
V+
V–
M9
M14
M2
*
*
*
*
M337
SD
INV
*
*
M340
*NOTE: ALL CURRENT SOURCES GO
TO 0
m
A IN SHUTDOWN MODE
INV
M31
M30
Figure 29. AD8591/AD8592/AD8594 Simplified Schematic
Input Voltage Protection
Although not shown on the simplified schematic, ESD protec-
tion diodes are connected from each input to each power supply
rail. These diodes are normally reverse biased, but will turn on
if either input voltage exceeds either supply rail by more than
+0.6 V. Should this condition occur, the input current should
be limited to less than
±
5 mA. This can be done by placing a
resistor in series with the input(s). The minimum resistor value
should be:
R
V
mA
IN
IN MAX
,
5
≥
(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 device’s inputs exceeds
+0.6V outside of the supply rails, the output could exhibit
phase reversal. This is due to the ESD protection diodes be-
coming forward biased, thus causing the polarity of the input
terminals of the device to switch.
The technique recommended in the Input Overvoltage 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 cir-
cuit protection circuitry. Although these amplifiers are designed to
sink or source as much as 250mA of output current, shorting the
output directly to the positive supply could damage or destroy the
device. To protect the output stage, the maximum output current
should be limited to
±
250mA.
By placing a resistor in series with the output of the amplifier as
shown in Figure 30, the output current can be limited. The
minimum value for R
X
can be found from Equation 2.
R
V
mA
X
SY
≥
250
(2)
For a +5 V single supply application,
R
X
should be at least 20
.
Because R
X
is inside the feedback loop, V
OUT
is not affected. The
tradeoff in using R
X
is a slight reduction in output voltage swing
under heavy output current loads. R
X
will also increase the effec-
tive output impedance of the amplifier to R
O
+ R
X
, where R
O
is
the output impedance of the device.
+5V
R
X
20
V
V
OUT
V
IN
AD8592
Figure 30. Output Short Circuit Protection
Power Dissipation
Although the AD859x family of amplifiers are able to provide
load currents of up to 250mA, proper attention should be
given to not exceeding the maximum junction temperature for
the device. The equation for finding the junction temperature is
given as:
T
P
T
DISS
A
A
J
J
=
×
+
θ
(3)
Where
T
J
= AD859x junction temperature
P
DISS
= AD859x power dissipation
θ
J
A
= AD859x junction-to-ambient thermal resistance
of the package; and
T
A
= The ambient temperature of the circuit
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