參數(shù)資料
型號(hào)： OPA2381AIDGKR
元件分類(lèi)： 跨阻放大器
英文描述： Precision, Low Power, 18MHz Transimpedance Amplifier
中文描述： 精密，低功耗，18MHz的阻放大器
文件頁(yè)數(shù)： 8/19頁(yè)
文件大?。?/td> 489K
代理商： OPA2381AIDGKR
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SBOS313B AUGUST 2004 REVISED NOVEMBER 2004
APPLICATIONS INFORMATION
BASIC OPERATION
www.ti.com
8
The OPA381 is a high-precision transimpedance
amplifier with very low 1/f noise. Due to its unique
architecture, the OPA381 has excellent long-term input
voltage offset stability.
The OPA381 performance results from an internal
auto-zero amplifier combined with a high-speed
amplifier. The OPA381 has been designed with circuitry
to improve overload recovery and settling time over that
achieved by a traditional composite approach. It has
been specifically designed and characterized to
accommodate circuit options to allow 0V output
operation (see Figure 3).
The OPA381 is used in inverting configurations, with the
noninverting input used as a fixed biasing point.
Figure 1 shows the OPA381 in a typical configuration.
Power-supply pins should be bypassed with 1
μ
F
ceramic or tantalum capacitors. Electrolytic capacitors
are not recommended.
OPA381
V
OUT(1)
(0.5V to 4.4V)
V
BIAS
= 0.5V
+5V
1
μ
F
R
F
C
F
λ
NOTE: (1) V
OUT
= 0.5V in dark conditions.
Figure 1. OPA381 Typical Configuration
OPERATING VOLTAGE
OPA381 series op amps are fully specified from 2.7V to
5.5V over a temperature range of 40
°
C to +125
°
C.
Parameters that vary significantly with operating
voltages or temperature are shown in the Typical
Characteristics.
INTERNAL OFFSET CORRECTION
The OPA381 series op amps use an auto-zero topology
with a time-continuous 18MHz op amp in the signal
path. This amplifier is zero-corrected every 100
μ
s using
a proprietary technique. Upon power-up, the amplifier
requires approximately 400
μ
s to achieve specified V
OS
accuracy, which includes one full auto-zero cycle of
approximately 100
μ
s and the start-up time for the bias
circuitry. Prior to this time, the amplifier will function
properly but with unspecified offset voltage.
This design has virtually no aliasing and low noise. Zero
correction occurs at a 10kHz rate, but there is virtually
no fundamental noise energy present at that frequency
due to internal filtering. For all practical purposes, any
glitches have energy at 20MHz or higher and are easily
filtered, if necessary. Most applications are not sensitive
to such high-frequency noise, and no filtering is
required.
INPUT VOLTAGE
The input common-mode voltage range of the OPA381
series extends from V to (V+) –1.8V. With input signals
above this common-mode range, the amplifier will no
longer provide a valid output value, but it will not latch
or invert.
INPUT OVERVOLTAGE PROTECTION
Device inputs are protected by ESD diodes that will
conduct if the input voltages exceed the power supplies
by more than approximately 500mV. Momentary
voltages greater than 500mV beyond the power supply
can be tolerated if the current is limited to 10mA. The
OPA381 family features no phase inversion when the
inputs extend beyond supplies if the input is current
limited.
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參數(shù)描述
OPA2381AIDGKRG4 功能描述:運(yùn)算放大器 - 運(yùn)放 Precision Lo-Power Transimpedance RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
OPA2381AIDGKT 功能描述:運(yùn)算放大器 - 運(yùn)放 Precision Lo-Power Transimpedance RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
OPA2381AIDGKT 制造商:Texas Instruments 功能描述:IC OP-AMP TRANSIMPED 18MHZ 8MSOP
OPA2381AIDGKTG4 功能描述:運(yùn)算放大器 - 運(yùn)放 Precision Lo-Power Transimpedance RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
OPA2381AIDRBR 功能描述:運(yùn)算放大器 - 運(yùn)放 Precision Lo-Power Transimpedance RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
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