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OPA847

更新时间： 2024-11-03 22:50:47
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Wideband, Ultra-Low Noise, Voltage-Feedback

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OPA847 数据手册

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OPA847  
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: VIO < ±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  
+5V  
0.001µF  
20Ω  
OPA847  
100Ω  
DIFFERENTIAL OPA847 DRIVER DISTORTION  
2VPP, at converter input.  
–70  
1.7pF  
VIN  
+
–5V  
2kΩ  
50Ω Source  
100pF  
VCM  
–75  
–80  
39pF  
39pF  
850Ω  
1:2  
ADS5421  
14-Bit  
40MSPS  
< 5.1dB  
Noise  
Figure  
850Ω  
0.1µF  
–85  
2kΩ  
+5V  
OPA847  
–5V  
–90  
VIN–  
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  
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.  
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 © 2002-2003, Texas Instruments Incorporated  
www.ti.com  
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