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OPA687N/3K PDF预览

OPA687N/3K

更新时间： 2024-09-16 23:24:27
品牌 Logo 应用领域
其他 - ETC 运算放大器光电二极管
页数 文件大小 规格书
17页 286K
描述
Voltage-Feedback Operational Amplifier

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OPA687N/3K 数据手册

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OPA687  
OPA687  
www.ti.com  
TM  
Wideband, Ultra-Low Noise,  
Voltage Feedback OPERATIONAL AMPLIFIER  
With Power Down  
APPLICATIONS  
● LOW DISTORTION ADC DRIVER  
● OC-3 FIBER OPTIC RECEIVER  
● LOW NOISE DIFFERENTIAL AMPLIFIERS  
● EQUALIZING RECEIVERS  
FEATURES  
● HIGH GAIN BANDWIDTH: 3.8GHz  
● LOW INPUT VOLTAGE NOISE: 0.95nV/√Hz  
● VERY LOW DISTORTION: –95dBc (5MHz)  
● LOW DISABLED POWER: 2mW  
● VERY HIGH SLEW RATE: 900V/µs  
● STABLE FOR G ≥ 12  
● ULTRASOUND CHANNEL AMPLIFIERS  
● IMPROVED REPLACEMENT FOR THE  
CLC425  
stages. As a voltage gain stage, the OPA687 is opti-  
mized for a flat frequency response at a gain of +20 and  
is guaranteed stable down to gains of +12. New external  
compensation techniques allows the OPA687 to be used  
at any inverting gain with excellent frequency response  
control. Using this compensation can give an extremely  
high dynamic range ADC driver to support > 40MSPS  
12- and 14-bit converters.  
DESCRIPTION  
The OPA687 combines a very high gain bandwidth and  
large signal performance with an ultra-low input noise  
voltage (0.95nV/√Hz) while dissipating only 18mA sup-  
ply current. Where power savings is paramount, the  
OPA687 also includes an optional power down pin that,  
when pulled low, will disable the amplifier and decrease  
the quiescent current to only 1% of its powered up value.  
This optional feature may be left disconnected to insure  
normal amplifier operation when no power-down is re-  
quired.  
OPA687 RELATED PRODUCTS  
INPUT NOISE  
VOLTAGE (nV/√Hz)  
GAIN BANDWIDTH  
PRODUCT (MHz)  
SINGLES  
DUAL  
The combination of low input voltage and current noise,  
along with a 3.8GHz gain bandwidth product, make the  
OPA687 an ideal amplifier for wideband transimpedance  
OPA642  
OPA643  
OPA686  
—
—
2.7  
2.3  
1.3  
210  
800  
OPA2686  
1600  
+5V  
+5V  
VCM  
20Ω  
–60  
OPA687  
100Ω  
1.7pF  
–65  
–70  
–75  
–80  
–85  
VIN  
+
4Vp-p  
–5V  
50Ω Source  
80pF  
39pF  
39pF  
850Ω  
1:2  
ADS852  
14-Bit  
65MSPS  
< 6dB  
Noise  
Figure  
850Ω  
2Vp-p  
+5V  
OPA687  
–5V  
VIN  
–
100Ω  
1.7pF  
80pF  
20Ω  
0
5
10  
15 20  
25  
30 35  
40  
45 50  
VCM  
Center Frequency (MHz)  
Ultra-High Dynamic Range  
Differential Input ADC Driver  
Measured 2-Tone, 3rd-Order Distortion for  
Differential ADC Driver.  
Copyright © 1998, Texas Instruments Incorporated  
SBOS065A  
Printed in U.S.A. January, 2001  
1234567...17

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