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THS3115CD

更新时间： 2024-11-29 15:54:19
品牌 Logo 应用领域
德州仪器 - TI 放大器光电二极管商用集成电路
页数 文件大小 规格书
7页 215K
描述
Dual, Low-Noise, High Output Current, 110-MHz Amplifier with Shutdown 14-SOIC 0 to 70

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中文翻译

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THS3115CD 技术参数

是否Rohs认证： 符合生命周期：Obsolete
零件包装代码：SOIC包装说明：SOP,
针数：14Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.33.00.01
Factory Lead Time：1 week风险等级：5.58
其他特性：ALSO OPERATES WITH 10 TO 30V SINGLE SUPPLY标称带宽：110000 kHz
商用集成电路类型：VIDEO AMPLIFIERJESD-30 代码：R-PDSO-G14
JESD-609代码：e4长度：8.65 mm
湿度敏感等级：1信道数量：1
功能数量：2端子数量：14
最高工作温度：70 °C最低工作温度：
封装主体材料：PLASTIC/EPOXY封装代码：SOP
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：1.75 mm最大供电电压 (Vsup)：15 V
最小供电电压 (Vsup)：5 V表面贴装：YES
温度等级：COMMERCIAL端子面层：Nickel/Palladium/Gold (Ni/Pd/Au)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：3.9 mmBase Number Matches：1

THS3115CD 数据手册

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Amplifiers: Op Amps  
Texas Instruments Incorporated  
Expanding the usability of  
current-feedback amplifiers  
By Randy Stephens (Email: r-stephens@ti.com)  
Systems Specialist, Member Group Technical Staff  
Introduction  
Figure 1. VFB test circuit  
Although current-feedback (CFB) amplifiers have been  
around as long as the widely utilized voltage-feedback (VFB)  
amplifiers, their acceptance has been sporadic. One of the  
reasons for this is quite simple—they have a different  
name and therefore must be difficult and very hard to use.  
C
= 220 pF  
F
R
= 187 Ω  
R
= 750 Ω  
F
1, 2, 3  
G
This is simply not true. There are numerous papers  
comparing the differences between the two amplifier  
types that show they are more similar to each other than  
different. In fact, for numerous circuits, a CFB amplifier  
may actually yield better results due to its inherent slew-  
rate advantage, lack of a gain-bandwidth product, and  
reasonably low noise for the performance.  
+15 V  
V
OUT  
V
IN  
THS4012  
R
L
Almost every paper written about CFB amplifiers cautions  
readers that placing a capacitor directly in the feedback path,  
without any resistance in series, will cause the CFB ampli-  
fier to oscillate. This is true, as the compensation of the  
amplifier is tied directly to the feedback impedance. Since a  
capacitor has low impedance at high frequencies, this essen-  
tially places a short in the feedback path that inadvertently  
defeats amplifier compensation, resulting in instability.  
Because of this limitation, there are a handful of common  
circuits that are not recommended for use with a CFB  
amplifier. These include integrators, some types of filters,  
and special feedback-compensation techniques. But what  
if there was a way to make these circuits work? And what  
if the solution was as simple as adding a single component?  
This would make it feasible to implement a CFB amplifier  
for just about every application for which a VFB amplifier  
could be used, with the benefits of the CFB amplifier.  
100 Ω  
R
Term  
–15 V  
50 Ω  
Figure 2. CFB test circuit with simple  
modification  
C
= 220 pF  
F
R
= 187 Ω  
R
= 750 Ω  
F
G
+15 V  
Compensation  
Z
V
This article does not explain the compensation theory of  
VFB and CFB amplifiers, as there are many papers written  
on this topic. The only thing that is important is that  
there must be resistance, or impedance, in the feedback  
path at the open-loop intersection point to make the CFB  
amplifier stable.  
OUT  
V
IN  
THS3112  
R
L
100 Ω  
R
Term  
50 Ω  
–15 V  
Figure 1 shows a traditional VFB amplifier, a THS4012,  
configured in a noninverting gain of +5 with a simple low-  
pass gain filter set at approximately 1 MHz by the straight-  
forward 1/(2πR C ) formula.  
F
F
If a CFB amplifier like the THS3112 is simply dropped  
into this circuit, it will oscillate and the circuit will  
become useless. A method of compensating the CFB  
amplifier in this circuit is to insert a resistance, or imped-  
ance (Z), in the feedback path as shown in Figure 2.  
It can easily be seen that regardless of the impedance  
amplifier, can now be essentially any resistance desired.  
The reader should keep in mind that this is still a high-  
speed amplifier with speeds over 100 MHz; so the feedback  
resistance should always be kept less than a few kilohms  
to minimize the effects of parasitic capacitances on the  
overall circuit. Conversely, minimizing the resistance too  
much will place too much of a load on the amplifier,  
typically degrading performance.  
of the feedback path represented by R and C , the  
F
F
impedance Z is in the amplifier’s feedback loop dictating  
the compensation of the amplifier. The interesting thing  
about this configuration is that the feedback resistance  
One of the drawbacks of adding the impedance Z in this  
manner is that the summing node at the inverting terminal  
is now separated from the virtual summing node. This can  
(R ), which normally dictates the compensation of the  
F
23  
Analog Applications Journal  
3Q 2003  
www.ti.com/sc/analogapps  
Analog and Mixed-Signal Products  
1234567

中文翻译

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THS3115CD 替代型号

型号 品牌 替代类型 描述 数据表
THS3115ID TI

类似代替

 具有关断状态的双路低噪声高输出电流的 110MHz 放大器 | D | 14 | -40
THS3115CDRG4 TI

类似代替

 1 CHANNEL, VIDEO AMPLIFIER, PDSO14, GREEN, PLASITC, MS-012AB, SOIC-14
THS3115CDR TI

类似代替

 1 CHANNEL, VIDEO AMPLIFIER, PDSO14, GREEN, PLASITC, MS-012AB, SOIC-14

与THS3115CD相关器件

型号 品牌 获取价格 描述 数据表
THS3115CDG4 TI

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 		1 CHANNEL, VIDEO AMPLIFIER, PDSO14, GREEN, PLASITC, MS-012AB, SOIC-14
THS3115CDR TI

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 		1 CHANNEL, VIDEO AMPLIFIER, PDSO14, GREEN, PLASITC, MS-012AB, SOIC-14
THS3115CDRG4 TI

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 		1 CHANNEL, VIDEO AMPLIFIER, PDSO14, GREEN, PLASITC, MS-012AB, SOIC-14
THS3115CPWP TI

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 		具有关断状态的双路低噪声高输出电流的 110MHz 放大器 | PWP | 14 | 0
THS3115CPWPR TI

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 		具有关断状态的双路低噪声高输出电流的 110MHz 放大器 | PWP | 14 | 0
THS3115CPWPRG4 TI

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 		1 CHANNEL, VIDEO AMPLIFIER, PDSO14, GREEN, PLASTIC, HTSSOP-14
THS3115ID TI

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 		具有关断状态的双路低噪声高输出电流的 110MHz 放大器 | D | 14 | -40
THS3115IDG4 TI

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 		1 CHANNEL, VIDEO AMPLIFIER, PDSO14, GREEN, PLASITC, MS-012AB, SOIC-14
THS3115IPWP TI

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 		具有关断状态的双路低噪声高输出电流的 110MHz 放大器 | PWP | 14 | -4
THS3115IPWPR TI

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 		具有关断状态的双路低噪声高输出电流的 110MHz 放大器 | PWP | 14 | -4

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