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OPA847

更新时间： 2024-11-04 12:34:59
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德州仪器 - TI 运算放大器
页数 文件大小 规格书
30页 884K
描述
Wideband, Ultra-Low Noise, Voltage-Feedback OPERATIONAL AMPLIFIER with Shutdown

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OPA847 数据手册

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OPA847  
O
P
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www.ti.com  
SBOS251E – JULY 2002 – REVISED DECEMBER 2008  
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 saving is critical, the OPA847 also includes an op-  
tional 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.  
● HIGH GAIN BANDWIDTH: 3.9GHz  
● LOW INPUT VOLTAGE NOISE: 0.85nV/  
√Hz  
● VERY LOW DISTORTION: –105dBc (5MHz)  
● HIGH SLEW RATE: 950V/µs  
● HIGH DC ACCURACY: VIO < ±100µV  
● LOW SUPPLY CURRENT: 18.1mA  
● LOW SHUTDOWN POWER: 2mW  
● 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  
● HIGH DYNAMIC RANGE ADC PREAMPS  
● LOW NOISE, WIDEBAND, TRANSIMPEDANCE  
AMPLIFIERS  
● WIDEBAND, HIGH GAIN AMPLIFIERS  
● LOW NOISE DIFFERENTIAL RECEIVERS  
● ULTRASOUND CHANNEL AMPLIFIERS  
● 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  
+5V  
+5V  
0.001µF  
20Ω  
1750  
OPA847  
100Ω  
1.7pF  
DIFFERENTIAL OPA847 DRIVER DISTORTION  
2VPP, at converter input.  
INP  
–5V  
2kΩ  
–70  
–75  
50Ω Source  
100pF  
VCM  
39pF  
39pF  
850Ω  
1:2  
ADS5500  
14-Bit  
125MSPS  
< 5.1dB  
Noise  
850Ω  
–80  
0.1µF  
Figure  
–85  
2kΩ  
+5V  
OPA847  
–5V  
INN  
100Ω  
1.7pF  
100pF  
–90  
0.001µF  
20Ω  
2nd-Harmonic  
–95  
3rd-Harmonic  
–100  
–105  
–110  
24.6dB Gain  
Ultra-High Dynamic Range  
Differential ADC Driver  
10  
20  
30  
40  
50  
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.  
All trademarks are the property of their respective owners.  
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.  
Copyright © 2002-2008, Texas Instruments Incorporated  
www.ti.com  
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OPA847 替代型号

型号 品牌 替代类型 描述 数据表
OPA843 TI

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