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| 型号： | ADA4084-2ARMZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/29页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP RRIO 10MHZ DL 8MSOP |
| 标准包装： | 3,000 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 4.6 V/µs |
| 增益带宽积： | 15.9MHz |
| -3db带宽： | 13.9MHz |
| 电流 - 输入偏压： | 140nA |
| 电压 - 输入偏移： | 130µV |
| 电流 - 电源： | 625µA |
| 电流 - 输出 / 通道： | 30mA |
| 电压 - 电源，单路/双路(±)： | 4 V ~ 36 V，±2 V ~ 18 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
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Data Sheet
ADA4084-2
Rev. C | Page 23 of 28
STARTUP CHARACTERISTICS
The ADA4084-2 is specified to operate from 3 V to 30 V (±1.5 V to
±15 V) under nominal power supplies. During power up as the
supply voltage increases from 0 V to the nominal power supply
voltage, the supply current (ISY) increases as well to the point at
which it stabilizes and the amplifier is ready to operate. The
stabilization varies with temperature, as shown in Figure 80,
below such that at 40°C it takes a higher voltage and stabilizes
at a lower supply current than at hot temperatures where it takes a
lower voltage but stabilizes at a higher current. In all cases, the
ADA4084-2 is specified to start up and operate at a minimum of
3 V under all temperature conditions.
1000
0
36
I SY
/A
M
P
LIFIE
R
(
A
)
VSY (V)
100
200
300
400
500
600
700
800
900
4
8
12
16
20
24
28
32
ADA4084-2
TA = 25°C
RL = ∞
+125°C
+25°C
–40°C
+85°C
08237-
072
Figure 80. Supply Current vs. Supply Voltage
INPUT PROTECTION
As with any semiconductor device, if conditions exist where the
applied input voltages to the device exceed either supply voltage,
the input overvoltage I-to-V characteristic of the device must be
considered. When an overvoltage occurs, the amplifier may be
damaged, depending on the magnitude of the applied voltage
and the magnitude of the fault current.
The D1, D2, D4, and D5 diodes conduct when the input common-
mode voltage exceeds either supply pin by a diode drop. This
varies with temperature and is in the range of 0.3 V to 0.8 V. As
illustrated in the simplified equivalent circuit shown in Figure 78,
the ADA4084-2 does not have any internal current limiting resis-
tors; thus, fault currents can quickly rise to damaging levels.
This input current is not inherently damaging to the device,
provided that it is limited to 5 mA or less. If a fault condition
causes more than 5 mA to flow, an external series resistor should
be added at the expense of additional thermal noise. Figure 81
illustrates a typical noninverting configuration for an overvoltage-
protected amplifier where the series resistance, RS, is chosen,
such that
(
)
mA
5
SUPPLY
MAX
IN
S
V
R
=
For example, a 1 kΩ resistor protects the ADA4084-2 against
input signals up to 5 V above and below the supplies. Note that
the thermal noise of a 1 k resistor at room temperature is
4 nV/√Hz, which exceeds the voltage noise of the ADA4084-2.
For other configurations where both inputs are used, each input
should be protected against abuse with a series resistor. Again,
to ensure optimum dc and ac performance, it is recommended
that source impedance levels be balanced.
R1
R2
VIN
VOUT
1/2
ADA4084-2
08237-
075
Figure 81. Resistance in Series with Input
Limits Overvoltage Currents to Safe Values
To protect Q1-Q2 and Q3-Q4 from large differential voltages
that may result in Zener breakdown of the emitter-base junction,
D100 and D101 are connected between the two inputs. This
precludes operation as a comparator. For a more complete
description, see the MT-035 Tutorial, Op Amp Inputs, Outputs,
Single-Supply, and Rail-to-Rail Issues; the MT-083 Tutorial,
Comparators, the MT-084 Tutorial, Using Op Amps As
Comparators; and the AN-849 Application Note, Using Op
Amps as Comparators, at www.analog.com.
OUTPUT PHASE REVERSAL
Some operational amplifiers designed for single-supply operation
exhibit an output voltage phase reversal when their inputs are
driven beyond their useful common-mode range. Typically, for
single-supply bipolar op amps, the negative supply determines
the lower limit of their common-mode range. With these devices,
external clamping diodes, with the anode connected to ground
and the cathode to the inputs, prevent input signal excursions
from exceeding the negative supply of the device (that is, GND),
preventing a condition that causes the output voltage to change
phase. JFET input amplifiers can also exhibit phase reversal, and, if
so, a series input resistor is usually required to prevent it.
The ADA4084-2 is free from reasonable input voltage range
restrictions, provided that input voltages no greater than the supply
Although device output does not change phase, large currents can
flow through the input protection diodes. Therefore, the technique
recommended in the Input Protection section should be applied to
those applications where the likelihood of input voltages
exceeding the supply voltages is high.
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