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OPA4684ID

更新时间： 2024-11-15 22:23:59
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26页 456K
描述
Quad, Low-Power, Current-Feedback OPERATIONAL AMPLIFIER

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OPA4684ID 数据手册

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O
OPA4684  
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SBOS240B – JUNE 2002 – REVISED AUGUST 2002  
Quad, Low-Power, Current-Feedback  
OPERATIONAL AMPLIFIER  
FEATURES  
APPLICATIONS  
● MINIMAL BANDWIDTH CHANGE VERSUS GAIN  
● 170MHz BANDWIDTH AT G = +2  
● LOW-POWER BROADCAST VIDEO DRIVERS  
● EQUALIZING FILTERS  
● > 120MHz BANDWIDTH TO GAIN > +10  
● LOW DISTORTION: < –78dBc at 5MHz  
● HIGH OUTPUT CURRENT: 120mA  
● SINGLE +5V TO +12V SUPPLY OPERATION  
● DUAL ±2.5 TO ±6.0V SUPPLY OPERATION  
● LOW SUPPLY CURRENT: 6.8mA Total  
● SAW FILTER HIGH-GAIN POST AMPLIFIERS  
● MULTICHANNEL SUMMING AMPLIFIERS  
● WIDEBAND DIFFERENTIAL CHANNELS  
● ANALOG-TO-DIGITAL CONVERTERS (ADC)  
INPUT DRIVERS  
● MULTIPLE POLE ACTIVE FILTERS  
● OPA4658 LOW-POWER UPGRADE  
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-power line drivers to meet the demanding require-  
ments of studio cameras and broadcast video.  
DESCRIPTION  
The OPA4684 provides a new level of performance in low-  
power, wideband, current-feedback (CFB) amplifiers. This  
CFBPLUS amplifier is 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  
solutions limited by inverting input linearity. Beyond simple  
high-gain applications, the OPA4684 CFBPLUS amplifier per-  
mits the gain setting element to be set with considerable  
The output capability of the OPA4684 also sets a new mark  
in performance for low-power current-feedback amplifiers.  
Delivering a full ±4Vp-p swing on ±5V supplies, the OPA4684  
also has the output current to support > ±3V swing into 50Ω.  
This minimal output headroom requirement is complemented  
by a similar 1.2V input stage headroom giving exceptional  
capability for single +5V operation.  
The OPA4684’s low 6.8mA 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.  
BW (MHz) vs GAIN  
6
V+  
G = 1  
1 of 4 Channels  
3
G = 2  
0
+
VO  
–3  
G = 5  
–6  
Z(S) IERR  
–9  
V–  
–12  
IERR  
G = 10  
–15  
G = 20  
RF  
–18  
G = 50  
–21  
RF = 800Ω  
RG  
G = 100  
–24  
Low-Power  
Amplifier  
10  
100  
200  
MHz  
Patent Pending  
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.  
Copyright © 2002, Texas Instruments Incorporated  
Products conform to specifications per the terms of Texas Instruments  
standard warranty. Production processing does not necessarily include  
testing of all parameters.  
www.ti.com  
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