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參數(shù)資料
| 型號： | OP262GSZ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運算放大器 |
| 英文描述： | 15 MHz Rail-to-Rail Operational Amplifier, Dual; Package: SOIC; No of Pins: 8; Temperature Range: Industrial |
| 中文描述： | DUAL OP-AMP, 800 uV OFFSET-MAX, 15 MHz BAND WIDTH, PDSO8 |
| 封裝： | LEAD FREE, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 4/20頁 |
| 文件大?。?/td> | 949K |
| 代理商： | OP262GSZ-REEL7 |
OP162/OP262/OP462
Rev. F | Page 12 of 20
APPLICATIONS
FUNCTIONAL DESCRIPTION
The OPx62 family is fabricated using Analog Devices’ high
speed complementary bipolar process, also called XFCB. This
process trench isolates each transistor to lower parasitic capaci-
tances for high speed performance. This high speed process has
been implemented without sacrificing the excellent transistor
matching and overall dc performance characteristic of Analog
Devices’ complementary bipolar process. This makes the OPx62
family an excellent choice as an extremely fast and accurate low
voltage op amp.
Figure 33 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 lowers the transconductance of
the input stage improving the slew rate of the device. Lowering
the transconductance through cross connecting 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 1 V of the positive power supply.
VCC
VEE
+IN
–IN
VOUT
00288-033
Figure 33. Simplified Schematic
Two complementary transistors in a common-emitter
configuration 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 maximum voltage swing of the output decreases. This is due
to the collector-to-emitter saturation voltages of the output
transistors increasing. The gain of the output stage, and conse-
quently the open-loop gain of the amplifier, is dependent on the
load resistance connected at the output. 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 have an exceptionally low
typical offset voltage, adjustment to correct offset voltage may
not be needed. However, the OP162 has pinouts to attach a
nulling resistor. Figure 34 shows how the OP162 offset voltage
can be adjusted by connecting a potentiometer between Pin 1
and Pin 8, and connecting the wiper to VCC. It is important to
avoid accidentally connecting the wiper to VEE, as this can damage
the device. The recommended value for the potentiometer is
20 k.
–5V
20k
OP162
+5V
VOS
3
2
4
7
8
1
6
00288-034
Figure 34. Offset Adjustment Schematic
RAIL-TO-RAIL OUTPUT
The OP162/OP262/OP462 have 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 extends 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
1
=
S
V,min
V
A
where VS 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 are 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 ±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 35. The resistor is connected within the feed-
back loop of the amplifier so that if VOUT is shorted to ground
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| OP262HRU-REEL | 功能描述:IC OPAMP GP R-R 15MHZ LN 8TSSOP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
| OP262HRUZ | 功能描述:IC OPAMP GP R-R 15MHZ LN 8TSSOP RoHS:是 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(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
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