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AD8591 bảng dữ liệu(PDF) 9 Page - Analog Devices

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AD8591/AD8592/AD8594
–9–
REV. A
In any application, the absolute maximum junction temperature
must be limited to +150
°C. If this junction temperature is ex-
ceeded, the device could suffer premature failure. If the output
voltage and output current are in phase, for example, with a
purely resistive load, the power dissipated by the AD859x can
be found as:
PI
V
V
ISS
SY
OUT
D
LOAD
()
(4)
Where
ILOAD = AD859x output load current
VSY = AD859x supply voltage; and
VOUT = The output voltage
By calculating the power dissipation of the device and using the
thermal resistance value for a given package type, the maximum
allowable ambient temperature for an application can be found
using Equation 3.
Capacitive Loading
The AD859x exhibits excellent capacitive load driving capabilities
and can drive up to 10 nF directly. Although the device is stable
with large capacitive loads, there is a decrease in amplifier band-
width as the capacitive load increases. Figure 31 shows a graph of
the AD8592 unity gain bandwidth under various capacitive loads.
CAPACITIVE LOAD – nF
4
3.5
0
0.01
100
0.1
110
2
1.5
1
0.5
3
2.5
VS = 2.5V
RL = 1k
TA = +25 C
Figure 31. Unity Gain Bandwidth vs. Capacitive Load
When driving heavy capacitive loads directly from the AD859x
output, a snubber network can be used to improve transient
response. This network consists of a series R-C connected from
the amplifier’s output to ground, placing it in parallel with the
capacitive load. The configuration is shown in Figure 32. Al-
though this network will not increase the bandwidth of the am-
plifier, it will significantly reduce the amount of overshoot, as
shown in Figure 33.
+5V
RS
5
VOUT
VIN
100mV p-p
AD8592
CL
47nF
CS
1 F
Figure 32. Configuration for Snubber Network to
Compensate for Capacitive Loads
10
0%
10 s
50mV
100
90
50mV
47nF LOAD
ONLY
SNUBBER
IN CIRCUIT
Figure 33. Snubber Network Reduces Overshoot and
Ringing Caused from Driving Heavy Capacitive Loads
The optimum values for the snubber network should be determined
empirically based on the size of the capacitive load. Table I shows a
few sample snubber network values for a given load capacitance.
Table I. Snubber Networks for Large Capacitive Loads
Load Capacitance
Snubber Network
(CL)(RS, CS)
0.47 nF
300
Ω, 0.1 µF
4.7 nF
30
Ω, 1 µF
47 nF
5
Ω, 1 µF
A PC-98 Compliant Headphone/Speaker Amplifier
Because of its high output current performance and shutdown
feature, the AD8592 makes an excellent amplifier for driving an
audio output jack in a computer application. Figure 34 shows
how the AD8592 can be interfaced with an AC97 codec to drive
headphones or speakers.
U1-A
R2
2k
4
C1
100 F
+5V
1
10
2
3
5
+5V
VDD
VDD
LEFTOUT
AD1881
(AC97)
RIGHTOUT
VSS
R4
20
+5V
R1
100k
7
8
6
9
R5
20
C2
100 F
NOTE: ADDITIONAL PINS
OMITTED FOR CLARITY
U1-B
U1 = AD8592
R3
2k
NC
28
35
36
Figure 34. A PC-98 Compliant Headphone/Line Out Amplifier
When headphones are plugged into the jack, the normalizing con-
tacts disconnect from the audio contacts. This allows the voltage to
the AD8592 shutdown pins to be pulled up to +5 V, activating the
amplifiers. With no plug in the output jack, the shutdown voltage is
pulled to 100 mV through the R1 and R3 + R5 voltage divider.
This powers the AD8592 down when it is not needed, saving
current from the power supply or battery.


Số phần tương tự - AD8591

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Analog Devices
AD8591 AD-AD8591 Datasheet
408Kb / 16P
   CMOS Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers with Shutdown
REV. B
AD8591 AD-AD8591 Datasheet
706Kb / 20P
   Low Power, 3.6 MHz, Low Noise, Rail-to - Rail Output, Operational Amplifiers
REV. D
AD8591 AD-AD8591 Datasheet
804Kb / 19P
   Low Power, 3.6 MHz, Low Noise, Rail-to-Rail Output, Operational Amplifiers
Rev. E
AD8591ART-REEL AD-AD8591ART-REEL Datasheet
408Kb / 16P
   CMOS Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers with Shutdown
REV. B
AD8591ARTZ AD-AD8591ARTZ Datasheet
408Kb / 16P
   CMOS Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers with Shutdown
Rev. B
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Mô tả tương tự - AD8591

nhà sản xuấttên linh kiệnbảng dữ liệuGiải thích chi tiết về linh kiện
logo
Analog Devices
AD8592 AD-AD8592_15 Datasheet
408Kb / 16P
   CMOS Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers with Shutdown
Rev. B
AD8592ARMZ-REEL AD-AD8592ARMZ-REEL Datasheet
408Kb / 16P
   CMOS Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers with Shutdown
REV. B
AD8594 AD-AD8594_15 Datasheet
408Kb / 16P
   CMOS Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers with Shutdown
Rev. B
AD8594 AD-AD8594 Datasheet
408Kb / 16P
   CMOS Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers with Shutdown
REV. B
AD8591 AD-AD8591_15 Datasheet
408Kb / 16P
   CMOS Single-Supply, Rail-to-Rail Input/Output Operational Amplifiers with Shutdown
Rev. B
OP250 AD-OP250 Datasheet
209Kb / 16P
   CMOS Single-Supply Rail-to-Rail Input/Output Operational Amplifiers
REV. 0
logo
National Semiconductor ...
LMV341 NSC-LMV341_14 Datasheet
1Mb / 35P
   RAIL-TO-RAIL OUTPUT CMOS OPERATIONAL AMPLIFIERS WITH SHUTDOWN
logo
Texas Instruments
LMV341 TI-LMV341 Datasheet
871Kb / 27P
[Old version datasheet]   RAIL-TO-RAIL OUTPUT CMOS OPERATIONAL AMPLIFIERS WITH SHUTDOWN
logo
Analog Devices
AD8602ARZ AD-AD8602ARZ Datasheet
350Kb / 24P
   Precision CMOS, Single-Supply, Rail-to-Rail, Input/Output Wideband Operational Amplifiers
Rev. G
AD8601 AD-AD8601_11 Datasheet
356Kb / 24P
   Precision CMOS, Single-Supply, Rail-to-Rail, Input/Output Wideband Operational Amplifiers
Rev. G
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