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OPA2683

更新时间： 2024-11-29 11:56:07
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德州仪器 - TI 运算放大器
页数 文件大小 规格书
33页 907K
描述
Very Low-Power, Dual, Current-Feedback Operational Amplifier

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OPA2683  
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www.ti.com  
SBOS244H – MAY 2002 – REVISED JULY 2009  
Very Low-Power, Dual, Current-Feedback  
Operational Amplifier  
APPLICATIONS  
FEATURES  
● LOW-POWER BROADCAST VIDEO DRIVERS  
● µPOWER ACTIVE FILTERS  
● REDUCED BANDWIDTH CHANGE VERSUS GAIN  
● 150MHz BANDWIDTH G = +2  
● SHORT-LOOP ADSL CO DRIVERS  
● MULTICHANNEL SUMMING AMPLIFIERS  
● PROFESSIONAL CAMERAS  
● > 80MHz BANDWIDTH TO GAIN > +10  
● LOW DISTORTION: < –65dBc at 5MHz  
● HIGH OUTPUT CURRENT: 110mA  
● DIFFERENTIAL ADC INPUT DRIVERS  
● SINGLE-SUPPLY OPERATION: +5V to +12V  
● DUAL-SUPPLY OPERATION: ±2.5V to ±6V  
● LOW SUPPLY CURRENT: 1.9mA Total  
● POWER SHUTDOWN VERSION: MSOP-10  
flexibility allows frequency response peaking elements to be  
added, multiple input inverting summing circuits to have greater  
bandwidth, and low-power differential line drivers to meet the  
demanding requirements of DSL.  
DESCRIPTION  
The OPA2683 provides a new level of performance for dual, very  
low-power, wideband, current-feedback amplifiers. This CFBPLUS  
amplifier is among the first to use an internally closed-loop input  
buffer stage that significantly enhances performance over earlier  
low-power, current-feedback (CFB) amplifiers. This new archi-  
tecture provides many of the advantages of a more ideal CFB  
amplifier while retaining the benefits of very low-power operation.  
The closed-loop input stage buffer gives a very low and linearized  
impedance path at the inverting input to sense the feedback error  
current. This improved inverting input impedance gives excep-  
tional bandwidth retention to much higher gains and improved  
harmonic distortion over earlier solutions limited by inverting input  
linearity. Beyond simple high gain applications, the OPA2683  
CFBPLUS amplifier can allow the gain setting element to be set with  
considerable freedom from amplifier bandwidth interaction. This  
The output capability for the OPA2683 also sets a new mark in  
performance for very low-power, current-feedback amplifiers. De-  
livering a full ±4VPP swing on ±5V supplies, the OPA2683 also has  
the output current to support this swing into a 100Ω load. This  
minimal output headroom requirement is complemented by a  
similar 1.2V input stage headroom, giving exceptional capability for  
single +5V operation.  
The OPA2683’s low 1.9mA total supply current is precisely trimmed  
at +25°C. This trim, along with low shift over temperature and supply  
voltage, gives a very robust design over a wide range of operating  
conditions. Further system power reduction is possible using  
the shutdown feature of the MSOP-10 package.  
NONINVERTING SMALL-SIGNAL  
FREQUENCY RESPONSE  
6
V+  
G = 10 G = 1  
3
0
G = 2  
+
VO  
–3  
G = 50  
Z(S) IERR  
V–  
–6  
G = 10  
–9  
IERR  
G = 50  
RF  
–12  
–15  
G = 100  
RG  
RF = 953Ω  
–18  
Low-Power  
Amplifier  
1
10  
Frequency (Hz)  
100  
200  
U.S. Patent No. 6,724,260  
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 © 2002-2009, Texas Instruments Incorporated  
www.ti.com  
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