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OPA3684IDBQ PDF预览

OPA3684IDBQ

更新时间： 2024-11-26 04:35:43
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26页 466K
描述
Low-Power, Triple Current-Feedback OPERATIONAL AMPLIFIER With Disable

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OPA3684IDBQ 数据手册

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OPA3684  
O
P
A
3
6
8
4
SBOS241A – MAY 2002 – REVISED SEPTEMBER 2002  
Low-Power, Triple Current-Feedback  
OPERATIONAL AMPLIFIER With Disable  
FEATURES  
APPLICATIONS  
● MINIMAL BANDWIDTH CHANGE VERSUS GAIN  
● 170MHz BANDWIDTH: G = +2  
● RGB LINE DRIVERS  
● LOW-POWER BROADCAST VIDEO DRIVERS  
● EQUALIZING FILTERS  
● MULTICHANNEL SUMMING AMPLIFIERS  
● PROFESSIONAL CAMERAS  
● ADC INPUT DRIVERS  
● > 120MHz BANDWIDTH TO GAIN > +10  
● LOW DISTORTION: < –82dBc at 5MHz  
● HIGH OUTPUT CURRENT: 120mA  
● SINGLE +5V TO +12V SUPPLY OPERATION  
● DUAL ±2.5V TO ±6.0V SUPPLY OPERATION  
● LOW SUPPLY CURRENT: 1.7mA/ch  
● LOW SHUTDOWN CURRENT: 100µA/ch  
have greater bandwidth, and low-power line drivers to meet the  
demanding requirements of studio cameras and broadcast video.  
DESCRIPTION  
The OPA3684 provides a new level of performance in low-power,  
wideband, current-feedback (CFB) amplifiers. This CFBPLUS am-  
plifier among 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 solu-  
tions limited by inverting input linearity. Beyond simple high-gain  
applications, the OPA3684 CFBPLUS amplifier permits the gain  
setting element to be set with considerable freedom from amplifier  
bandwidth interaction. This allows frequency response peaking  
elements to be added, multiple input inverting summing circuits to  
The output capability of the OPA3684 also sets a new mark in  
performance for low-power current-feedback amplifiers. Delivering  
a full ±4Vp-p swing on ±5V supplies, the OPA3684 also has the  
output current to support > ±3Vp-p into 50Ω. This minimal output  
headroom requirement is complemented by a similar 1.2V input  
stage headroom giving exceptional capability for single +5V opera-  
tion.  
The OPA3684’s low 1.7mA/ch 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 OPA3684 supply  
current drops to less than 100µA/ch while the I/O pins go to a high  
impedance state.  
BW (MHz) vs GAIN  
1 of 3 Channels  
6
G = 1  
V+  
3
G = 2  
0
–3  
+
G = 5  
VO  
–6  
–9  
Z(S) IERR  
V–  
–12  
G = 10  
G = 20  
G = 50  
G = 100  
–15  
–18  
–21  
–24  
IERR  
RF  
RF = 800Ω  
10  
100  
200  
RG  
Low-Power  
Patent Pending  
Amplifier  
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, Texas Instruments Incorporated  
www.ti.com  
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