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參數(shù)資料
| 型號(hào)： | OP462DS |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 15 MHz Rail-to-Rail Operational Amplifiers |
| 中文描述： | QUAD OP-AMP, 5000 uV OFFSET-MAX, 15 MHz BAND WIDTH, PDSO14 |
| 封裝： | MS-012AB, SOIC-14 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 1235K |
| 代理商： | OP462DS |
–9–
REV. D
OP162/OP262/OP462
V
CC
. It is important to avoid accidentally connecting the wiper
to V
EE
, as this will damage the device. The recommended value
for the potentiometer is 20 k
W
.
6
7
4
1
2
3
8
–5V
20k
OP162
+5V
V
OS
Figure 28. Schematic Showing Offset Adjustment
Rail-to-Rail Output
The OP162/OP262/OP462 has a wide output voltage range that
extends to within 60 mV of each supply rail with a load current
of 5 mA. Decreasing the load current will extend the output
voltage range even closer to the supply rails. The common-
mode input range extends from ground to within 1 V of the
positive supply. It is recommended that there be some minimal
amount of gain when a rail-to-rail output swing is desired. The
minimum gain required is based on the supply voltage and can
be found as:
A
V
,min
=
V
S
V
S
–1
where
V
S
is the positive supply voltage. With a single supply
voltage of +5 V, the minimum gain to achieve rail-to-rail output
should be 1.25.
Output Short-Circuit Protection
To achieve a wide bandwidth and high slew rate, the output of
the OP162/OP262/OP462 is not short-circuit protected. Short-
ing the output directly to ground or to a supply rail may destroy
the device. The typical maximum safe output current is
±
30 mA.
Steps should be taken to ensure the output of the device will not
be forced to source or sink more than 30 mA.
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 29. The resistor is connected within the feed-
back loop of the amplifier so that if V
OUT
is shorted to ground
and V
IN
swings up to +5 V, the output current will not exceed
30 mA.
For single +5 V supply applications, resistors less than 169
W
are not recommended.
OPx62
V
IN
169
V
OUT
+5V
Figure 29. Output Short-Circuit Protection
APPLICATIONS SECTION
Functional Description
The OPx62 family is fabricated using Analog Devices’ high
speed complementary bipolar process, also called XFCB. The
process includes trench isolating each transistor to lower para-
sitic capacitances thereby allowing high speed performance.
This high speed process has been implemented without trading
off the excellent transistor matching and overall dc performance
characteristic of Analog Devices’ complementary bipolar pro-
cess. This makes the OPx62 family an excellent choice as an
extremely fast and accurate low voltage op amp.
Figure 27 shows a simplified equivalent schematic for the OP162.
A PNP differential pair is used at the input of the device. The
cross connecting of the emitters is used to lower the transcon-
ductance of the input stage, which improves the slew rate of the
device. Lowering the transconductance through cross connect-
ing the emitters has another advantage in that it provides a
lower noise factor than if emitter degeneration resistors were
used. The input stage can function with the base voltages taken
all the way to the negative power supply, or up to within 1V of
the positive power supply.
V
CC
V
EE
+IN
–IN
V
OUT
Figure 27. Simplified Schematic
Two complementary transistors in a common-emitter configura-
tion are used for the output stage. This allows the output of the
device to swing to within 50 mV of either supply rail at load
currents less than 1 mA. As load current increases, the maxi-
mum voltage swing of the output will decrease. This is due to
the collector-to-emitter saturation voltages of the output transis-
tors increasing. The gain of the output stage, and consequently
the open-loop gain of the amplifier, is dependent on the load
resistance connected at the output. And because the dominant
pole frequency is inversely proportional to the open-loop gain,
the unity-gain bandwidth of the device is not affected by the
load resistance. This is typically the case in rail-to-rail output
devices.
Offset Adjustment
Because the OP162/OP262/OP462 has such an exceptionally
low typical offset voltage, adjustment to correct offset voltage
may not be needed. However, the OP162 does have pinouts
where a nulling resistor can be attached. Figure 28 shows how
the OP162 offset voltage can be adjusted by connecting a poten-
tiometer between Pins 1 and 8, and connecting the wiper to
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| OP462GP | 15 MHz Rail-to-Rail Operational Amplifiers |
| OP462GS | 15 MHz Rail-to-Rail Operational Amplifiers |
| OP262 | 15 MHz Rail-to-Rail Operational Amplifiers |
| OP162 | 15 MHz Rail-to-Rail Operational Amplifiers |
| OP162GP | 15 MHz Rail-to-Rail Operational Amplifiers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OP462DS-REEL | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R O/P ±6V/12V 14-Pin SOIC N T/R |
| OP462DS-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R O/P 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R O/P ±6V/12V 14-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:LOW COST/POWER 15MHZ RAIL-RAIL OP AMP - Tape and Reel |
| OP462DSZ | 制造商:Analog Devices 功能描述:OP Amp Quad GP R-R O/P ±6V/12V 14-Pin SOIC N |
| OP462DSZ-REEL | 制造商:AD 制造商全稱:Analog Devices 功能描述:15 MHz Rail-to-Rail Operational Amplifiers |
| OP462DSZ-REEL7 | 制造商:AD 制造商全稱:Analog Devices 功能描述:15 MHz Rail-to-Rail Operational Amplifiers |
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