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OPA657UB/2K5 PDF预览

OPA657UB/2K5

更新时间: 2024-10-26 22:17:39
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
20页 389K
描述
1.6GHz, Low-Noise, FET-Input OPERATIONAL AMPLIFIER

OPA657UB/2K5 数据手册

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OPA657  
OPA657  
SBOS197B – DECEMBER 2001 – REVISED MAY 2004  
1.6GHz, Low-Noise, FET-Input  
OPERATIONAL AMPLIFIER  
FEATURES  
DESCRIPTION  
The OPA657 combines a high gain bandwidth, low distor-tion,  
voltage-feedback op amp with a low voltage noise JFET-input  
stage to offer a very high dynamic range amplifier for high  
precision ADC (Analog-to-Digital Converter) driving or wideband  
transimpedance applications. Photodiode applications will see  
improved noise and bandwidth using this decompensated,  
high gain bandwidth amplifier.  
HIGH GAIN BANDWIDTH PRODUCT: 1.6GHz  
HIGH BANDWIDTH 275MHz (G = +10)  
LOW INPUT OFFSET VOLTAGE: ±0.25mV  
LOW INPUT BIAS CURRENT: 2pA  
LOW INPUT VOLTAGE NOISE: 4.8nV/ Hz  
HIGH OUTPUT CURRENT: 70mA  
Very low level signals can be significantly amplified in a single  
OPA657 gain stage with exceptional bandwidth and accuracy.  
Having a high 1.6GHz gain bandwidth product will give >  
10MHz signal bandwidths up to gains of 160V/V (44dB). The  
very low input bias current and capacitance will support this  
performance even for relatively high source impedances.  
FAST OVERDRIVE RECOVERY  
APPLICATIONS  
WIDEBAND PHOTODIODE AMPLIFIER  
WAFER SCANNING EQUIPMENT  
ADC INPUT AMPLIFIER  
Broadband photodetector applications will benefit from the low  
voltage noise JFET inputs for the OPA657. The JFET input  
contributes virtually no current noise while for broadband  
applications, a low voltage noise is also required. The low  
4.8nV/ Hz input voltage noise will provide exceptional input  
sensitivity for higher bandwidth applications. The example  
shown below will give a total equivalent input noise current of  
1.8pA/ Hz over a 10MHz bandwidth.  
TEST AND MEASUREMENT FRONT END  
HIGH GAIN PRECISION AMPLIFIER  
RELATED OPERATIONAL AMPLIFIER PRODUCTS  
200kTRANSIMPEDANCE BANDWIDTH  
116  
SLEW VOLTAGE  
10MHz Bandwidth  
VS BW RATE NOISE  
DEVICE (V) (MHz) (V/µS) (nV/HZ) AMPLIFIER DESCRIPTION  
106  
OPA355 +5 200  
OPA655 ±5 400  
OPA656 ±5 500  
OPA627 ±15 16  
THS4601 ±15 180  
300  
290  
170  
55  
5.80  
6
Unity-Gain Stable CMOS  
Unity-Gain Stable FET-Input  
Unity-Gain Stable FET-Input  
Unity-Gain Stable FET-Input  
Unity-Gain Stable FET-Input  
96  
86  
76  
66  
7
4.5  
5.4  
100  
0.1pF  
200kΩ  
100kHz  
1MHz  
Frequency  
10MHz  
50MHz  
λ
VO  
OPA657  
(12pF)  
Vb  
Wideband Photodiode Transimpedance 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.  
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 © 2001-2004, Texas Instruments Incorporated  
www.ti.com  

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