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參數資料
| 型號： | AD8591 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | CMOS Single Supply Rail-to-Rail Input/Output Operational Amplifiers with Shutdown |
| 中文描述： | CMOS單電源軌到軌輸入/輸出運算放大器，帶有關斷 |
| 文件頁數： | 9/15頁 |
| 文件大小： | 227K |
| 代理商： | AD8591 |
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:
×
(
P
I
V
V
ISS
D
SY
OUT
LOAD
=
)
–
(4)
Where
I
LOAD
= AD859x output load current
V
SY
= AD859x supply voltage; and
V
OUT
= 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
B
1
10
2
1.5
1
0.5
3
2.5
V
S
=
6
2.5V
R
L
= 1k
V
T
A
= +25
8
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
R
S
5
V
C
S
1
m
F
V
OUT
V
IN
100mV p-p
AD8592
C
47nF
Figure 32. Configuration for Snubber Network to
Compensate for Capacitive Loads
10
0%
10
m
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
(C
L
)
0.47 nF
4.7 nF
47 nF
Snubber Network
(R
S
, C
S
)
300
, 0.1
μ
F
30
, 1
μ
F
5
, 1
μ
F
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.
+5V
U1-A
R2
2k
V
4
C1
100
m
F
+5V
1
10
2
3
5
V
DD
V
DD
LEFT
OUT
AD1881
(AC97)
RIGHT
OUT
V
SS
R4
20
V
+5V
R1
100k
V
7
8
6
9
R5
20
V
C2
100
m
F
NOTE: ADDITIONAL PINS
OMITTED FOR CLARITY
U1-B
U1 = AD8592
R3
2k
V
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.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8591ART | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS Single Supply Rail-to-Rail Input/Output Operational Amplifiers with Shutdown |
| AD8591ART-REEL | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 6V 6-Pin SOT-23 T/R 制造商:Rochester Electronics LLC 功能描述:SINGLE, CMOS RAIL-RAIL OP AMP W/SHUTDOWN - Tape and Reel |
| AD8591ART-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Single GP R-R I/O 6V 6-Pin SOT-23 T/R 制造商:Rochester Electronics LLC 功能描述:SINGLE, CMOS RAIL-RAIL OP AMP W/SHUTDOWN - Tape and Reel |
| AD8591ARTZ-REEL | 功能描述:IC OPAMP GP R-R CMOS SOT23-6 RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:160 系列:- 放大器類型:通用 電路數:4 輸出類型:滿擺幅 轉換速率:10 V/µs 增益帶寬積:9MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:250µV 電流 - 電源:730µA 電流 - 輸出 / 通道:28mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC N 包裝:管件 |
| AD8591ARTZ-REEL7 | 功能描述:IC OPAMP GP R-R CMOS SOT23-6 RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 特色產品:CMOS Operational Amplifier 標準包裝:2,500 系列:- 放大器類型:通用 電路數:2 輸出類型:滿擺幅 轉換速率:1 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:1000µV 電流 - 電源:900µA 電流 - 輸出 / 通道:1mA 電壓 - 電源，單路/雙路(±):5 V ~ 14.5 V，±2.5 V ~ 7.25 V 工作溫度:-40°C ~ 105°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.173"，4.40mm 寬） 供應商設備封裝:8-SOP 包裝:帶卷 (TR) 產品目錄頁面:1372 (CN2011-ZH PDF) 其它名稱:BD7562SF-E2TR |
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