Datasheet > OPA847IDR

OPA847IDR

更新时间： 2024-11-03 22:15:31

品牌	Logo	应用领域
BB		放大器光电二极管
页数	文件大小	规格书
23页	525K
描述
Wideband, Ultra-Low Noise, Voltage-Feedback

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OPA847IDR 数据手册

OPA847

SBOS251C – JULY 2002 – REVISED OCTOBER 2003

Wideband, Ultra-Low Noise, Voltage-Feedback

OPERATIONAL AMPLIFIER with Shutdown

DESCRIPTION

FEATURES

The OPA847 combines very high gain bandwidth and large

signal performance with an ultra-low input noise voltage

(0.85nV/√Hz) while using only 18mA supply current. Where

power savings is critical, the OPA847 also includes an

optional power shutdown pin that, when pulled low, disables

the amplifier and decreases the supply current to < 1% of the

powered-up value. This optional feature may be left discon-

nected to ensure normal amplifier operation when no power-

down is required.

z HIGH GAIN BANDWIDTH: 3.9GHz

z LOW INPUT VOLTAGE NOISE: 0.85nV/

√Hz

z VERY LOW DISTORTION: –105dBc (5MHz)

z HIGH SLEW RATE: 950V/µs

z HIGH DC ACCURACY: V_IO< ±100µV

z LOW SUPPLY CURRENT: 18.1mA

z LOW SHUTDOWN POWER: 2mW

z STABLE FOR GAINS ≥ 12

The combination of very low input voltage and current noise,

along with a 3.9GHz gain bandwidth product, make the

OPA847 an ideal amplifier for wideband transimpedance

applications. As a voltage gain stage, the OPA847 is opti-

mized for a flat frequency response at a gain of +20V/V and

is stable down to gains as low as +12V/V. New external

compensation techniques allow the OPA847 to be used at

any inverting gain with excellent frequency response control.

Using this technique in a differential Analog-to-Digital Con-

verter (ADC) interface application, shown below, can deliver

one of the highest dynamic-range interfaces available.

APPLICATIONS

z HIGH DYNAMIC RANGE ADC PREAMPS

z LOW NOISE, WIDEBAND, TRANSIMPEDANCE

AMPLIFIERS

z WIDEBAND, HIGH GAIN AMPLIFIERS

z LOW NOISE DIFFERENTIAL RECEIVERS

z ULTRASOUND CHANNEL AMPLIFIERS

z IMPROVED UPGRADE FOR THE OPA687,

CLC425, AND LMH6624

OPA847 RELATED PRODUCTS

INPUT NOISE

VOLTAGE (nV/√Hz)

GAIN BANDWIDTH

PRODUCT (MHz)

SINGLES

OPA842

OPA843

OPA846

2.6

2.0

1.2

200

800

1750

+5V

0.001µF

20Ω

OPA847

100Ω

DIFFERENTIAL OPA847 DRIVER DISTORTION

2V_PP, at converter input.

–70

1.7pF

V_IN

–5V

2kΩ

50Ω Source

100pF

V_CM

–75

–80

39pF

850Ω

1:2

ADS5421

14-Bit

40MSPS

< 5.1dB

Noise

Figure

850Ω

0.1µF

–85

2kΩ

+5V

OPA847

–5V

–90

V_IN–

100Ω

1.7pF

2nd-Harmonic

100pF

0.001µF

20Ω

–95

3rd-Harmonic

–100

–105

–110

24.6dB Gain

Ultra-High Dynamic Range

Differential ADC Driver

Frequency (MHz)

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.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

www.ti.com

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