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OPA684ID

更新时间： 2024-09-16 22:23:59
品牌 Logo 应用领域
德州仪器 - TI 运算放大器
页数 文件大小 规格书
25页 402K
描述
Low-Power, Current Feedback OPERATIONAL AMPLIFIER With Disable

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OPA684ID 数据手册

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OPA684  
OPA684  
OPA684  
SBOS219A – MARCH 2002  
Low-Power, Current Feedback  
OPERATIONAL AMPLIFIER With Disable  
FEATURES  
APPLICATIONS  
● MINIMAL BANDWIDTH CHANGE VERSUS GAIN  
● > 120MHz BANDWIDTH TO GAIN > +10  
● LOW DISTORTION: < –78dBc at 5MHz  
● HIGH OUTPUT CURRENT: 120mA  
● LOW-POWER BROADCAST VIDEO DRIVERS  
● EQUALIZING FILTERS  
● SAW FILTER HIGH GAIN POST AMPLIFIERS  
● MULTICHANNEL SUMMING AMPLIFIERS  
● PROFESSIONAL CAMERAS  
● SINGLE +5V TO +12V SUPPLY OPERATION  
● DUAL ±2.5 TO ±6.0V SUPPLY OPERATION  
● LOW SUPPLY CURRENT: 1.7mA  
● ADC INPUT DRIVERS  
● LOW SHUTDOWN CURRENT: 100µA  
power line drivers to meet the demanding requirements of studio  
cameras and broadcast video.  
DESCRIPTION  
The OPA684 provides a new level of performance in low-power,  
wideband, current-feedback (CFB) amplifiers. This CFBplus ampli-  
fier is the first to use an internally closed-loop input buffer stage that  
enhances performance significantly over earlier low-power CFB  
amplifiers. While retaining the benefits of very low power operation,  
this new architecture provides many of the benefits of a more ideal  
CFB amplifier. 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  
retains exceptional bandwidth to much higher gains and improves  
harmonic distortion over earlier solutions limited by inverting input  
linearity. Beyond simple high-gain applications, the OPA684 CFBplus  
amplifier permits the gain setting element to be set with consider-  
able freedom from amplifier bandwidth interaction. This allows  
frequency response peaking elements to be added, multiple input  
inverting summing circuits to have greater bandwidth, and low-  
The output capability of the OPA684 also sets a new mark in  
performance for low-power current feedback amplifiers. Delivering  
a full ±4Vp-p swing on ±5V supplies, the OPA684 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 OPA684’s low 1.7mA 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. System power may be further reduced by using the  
optional disable control pin. Leaving this disable pin open, or holding  
it HIGH, gives normal operation. If pulled LOW, the OPA684 supply  
current drops to less than 100µA while the I/O pins go to a high  
impedance state.  
BW (MHz) vs GAIN  
V+  
G = 2  
G = 5  
3
0
+
–3  
–6  
–9  
VO  
Z(S) IERR  
V–  
–12  
G = 10  
–15  
IERR  
G = 20  
–18  
RF  
G = 50  
–21  
RF = 1kΩ  
10  
G = 100  
100  
200  
RG  
Low-Power  
Patent Pending  
Amplifier  
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 © 2001, Texas Instruments Incorporated  
www.ti.com  
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OPA684ID 替代型号

型号 品牌 替代类型 描述 数据表
OPA684IDG4 TI

类似代替

 Low-Power, Current Feedback Operational Amplifier With Disable 8-SOIC -40 to 85
OPA684IDR TI

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 Low-Power, Current Feedback OPERATIONAL AMPLIFIER With Disable

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OPA684IDG4 TI

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