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參數資料
| 型號： | AD8614 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Single and Quad +18 V Operational Amplifiers |
| 中文描述： | 單路和四路運算放大器18 V |
| 文件頁數： | 5/8頁 |
| 文件大小： | 303K |
| 代理商： | AD8614 |
AD8614/AD8644
–5–
REV. 0
SUPPLY VOLTAGE – V
0
2
20
4
6
8
10
12
14 16
18
S
m
s
9
8
0
4
3
2
1
7
5
6
A
V
= 1
R
L
= 2k
V
C
L
= 200pF
T
A
= 25
8
C
SR+
SR
2
Figure 19. Slew Rate vs. Supply
Voltage
V
FREQUENCY – Hz
100
10
110
100
10k
1k
V
S
= 5V
T
A
= 25
8
C
Figure 20. Voltage Noise Density
vs. Frequency
V
FREQUENCY – Hz
100
10
110
100
10k
1k
V
S
= 18V
T
A
= 25
8
C
Figure 21. Voltage Noise Density vs.
Frequency
APPLICATIONS SECTION
Theory of Operation
The AD8614/AD8644 are processed using Analog Devices’ high
voltage, high speed, complementary bipolar process—HV XFCB.
This process includes trench isolated transistors that lower parasitic
capacitance.
Figure 22 shows a simplified schematic of the AD8614/AD8644.
The input stage is rail-to-rail, consisting of two complementary
differential pairs, one NPN pair and one PNP pair. The input stage
is protected against avalanche breakdown by two back-to-back
diodes. Each input has a 1.5 k
resistor that limits input current
during over-voltage events and furnishes phase reversal protection
if the inputs are exceeded. The two differential pairs are connected
to a double-folded cascode. This is the stage in the amplifier with
the most gain. The double folded cascode differentially feeds the
output stage circuitry. Two complementary common emitter tran-
sistors are used as the output stage. This allows the output to swing
to within 125 mV from each rail with a 10 mA load. The gain of the
output stage, and thus the open loop gain of the op amp, depends on
the load resistance.
V
CC
2
+
1.5k
V
V
EE
V
CC
V
OUT
1.5k
V
V
CC
Figure 22. Simplified Schematic
The AD8614/AD8644 have no built-in short circuit protection.
The short circuit limit is a function of high current roll-off of the
output stage transistors and the voltage drop over the resistor
shown on the schematic at the output stage. The voltage over this
resistor is clamped to one diode during short circuit voltage events.
Output Short-Circuit Protection
To achieve a wide bandwidth and high slew rate, the output of
the AD8614/AD8644 is not short-circuit protected. Shorting
the output directly to ground or to a supply rail may destroy the
device. The typical maximum safe output current is 70mA.
In applications where some output current protection is needed,
but not at the expense of reduced output voltage headroom, a low
value resistor in series with the output can be used. This is shown
in Figure 23. The resistor is connected within the feedback loop
of the amplifier so that if V
OUT
is shorted to ground and V
IN
swings up to 18 V, the output current will not exceed 70 mA.
For 18 V single supply applications, resistors less than 261
are
not recommended.
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| AD8644AR2 | Single and Quad +18 V Operational Amplifiers |
| AD8644ARU | Single and Quad +18 V Operational Amplifiers |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD8614_07 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Single and Quad 18 V Operational Amplifiers |
| AD8614ART | 制造商:AD 制造商全稱:Analog Devices 功能描述:Single and Quad +18 V Operational Amplifiers |
| AD8614ART-R2 | 功能描述:IC OPAMP GP R-R 5.5MHZ SOT23-5 RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:1 系列:- 放大器類型:電流檢測 電路數:1 輸出類型:- 轉換速率:- 增益帶寬積:125kHz -3db帶寬:- 電流 - 輸入偏壓:- 電壓 - 輸入偏移:100µV 電流 - 電源:1.1µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:4-WFBGA，CSPBGA 供應商設備封裝:4-UCSP（2x2） 包裝:剪切帶 (CT) 其它名稱:MAX9634WERS+TCT |
| AD8614ART-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:Single and Quad 18 V Operational Amplifiers |
| AD8614ART-REEL7 | 功能描述:IC OPAMP GP R-R 5.5MHZ SOT23-5 RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:- 放大器類型:通用 電路數:1 輸出類型:滿擺幅 轉換速率:0.11 V/µs 增益帶寬積:350kHz -3db帶寬:- 電流 - 輸入偏壓:4nA 電壓 - 輸入偏移:20µV 電流 - 電源:260µA 電流 - 輸出 / 通道:20mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:8-SO 包裝:帶卷 (TR) |
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