Datasheet > OPA381AIDRBT

OPA381AIDRBT

更新时间： 2024-11-25 22:50:51

品牌	Logo	应用领域
BB		放大器
页数	文件大小	规格书
19页	487K
描述
Precision, Low Power, 18MHz Transimpedance Amplifier

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OPA381AIDRBT 数据手册

OPA381

OPA2381

SBOS313B − AUGUST 2004 − REVISED NOVEMBER 2004

Precision, Low Power, 18MHz

Transimpedance Amplifier

F_DEATURES

DESCRIPTION

OVER 250kHz TRANSIMPEDANCE

BANDWIDTH

The OPA381 family of transimpedance amplifiers provides

18MHz of Gain Bandwidth (GBW), with extremely high

precision, excellent long-term stability, and very low 1/f noise.

The OPA381 features an offset voltage of 25µV (max), offset

drift of 0.1µV/°C (max), and bias current of 3pA. The OPA381

far exceeds the offset, drift, and noise performance that

conventional JFET op amps provide.

DYNAMIC RANGE: 5 Decades

EXCELLENT LONG-TERM STABILITY

LOW VOLTAGE NOISE: 10nV/√Hz

BIAS CURRENT: 3pA

OFFSET VOLTAGE: 25µV (max)

OFFSET DRIFT: 0.1µV/°C (max)

GAIN BANDWIDTH: 18MHz

QUIESCENT CURRENT: 800µA

FAST OVERLOAD RECOVERY

SUPPLY RANGE: 2.7V to 5.5V

SINGLE AND DUAL VERSIONS

MicroPACKAGE: DFN-8, MSOP-8

The signal bandwidth of a transimpedance amplifier depends

largely on the GBW of the amplifier and the parasitic

capacitance of the photodiode, as well as the feedback

resistor. The 18MHz GBW of the OPA381 enables a trans-

impedance bandwidth of > 250kHz in most configurations.

The OPA381 is ideally suited for fast control loops for power

level measurement on an optical fiber.

As a result of the high precision and low-noise characteristics

of the OPA381, a dynamic range of 5 decades can be

achieved. This capability allows the measurement of signal

currents on the order of 10nA, and up to 1mA in a single I/V

conversion stage. In contrast to logarithmic amplifiers, the

OPA381 provides very wide bandwidth throughout the full

dynamic range. By using an external pulldown resistor to

–5V, the output voltage range can be extended to include 0V.

A_DPPLICATIONS

PRECISION I/V CONVERSION

PHOTODIODE MONITORING

OPTICAL AMPLIFIERS

CAT-SCANNER FRONT-END

PHOTO LAB EQUIPMENT

The OPA381 and OPA2381 are both available in MSOP-8

and DFN-8 (3mm x 3mm) packages. They are specified

from –40°C to +125°C.

R_F

+5V

OPA381 RELATED DEVICES

OPA381

PRODUCT

FEATURES

OUT

(0V to 4.4V)

90MHz GBW, 2.7V to 5.5V Supply

Transimpedance Amplifier

OPA380

C_DIODE

R_P

OPA132

OPA300

OPA335

OPA350

OPA354

OPA355

OPA656/7

16MHz GBW, Precision FET Op Amp 15V

150MHz GBW, Low-Noise, 2.7V to 5.5V Supply

Photodiode

(Optional

Pulldown

Resistor)

65pF

Ω

10µV V , Zero-Drift, 2.5V to 5V Supply

−

500µV V , 38MHz, 2.5V to 5V Supply

Ω

100k

100MHz GBW CMOS, RRIO, 2.5V to 5V Supply

200MHz GBW CMOS, 2.5V to 5V Supply

230MHz, Precision FET, 5V

75pF

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

ꢀꢁ ꢂ ꢃꢄ ꢅ ꢆꢇ ꢂꢈ ꢃ ꢉꢆꢉ ꢊꢋ ꢌꢍ ꢎ ꢏꢐ ꢑꢊꢍꢋ ꢊꢒ ꢓꢔ ꢎ ꢎ ꢕꢋꢑ ꢐꢒ ꢍꢌ ꢖꢔꢗ ꢘꢊꢓ ꢐꢑꢊ ꢍꢋ ꢙꢐ ꢑꢕꢚ ꢀꢎ ꢍꢙꢔ ꢓꢑꢒ

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