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ADA4939-2YCPZ-R2 PDF预览

ADA4939-2YCPZ-R2

更新时间： 2024-02-02 02:26:09
品牌 Logo 应用领域
亚德诺 - ADI 驱动器
页数 文件大小 规格书
24页 518K
描述
Ultralow Distortion Differential ADC Driver

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中文翻译

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ADA4939-2YCPZ-R2 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：QFN
包装说明：HVQCCN,针数：24
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.4
差分输出：YES驱动器位数：1
输入特性：DIFFERENTIAL接口集成电路类型：LINE DRIVER
接口标准：GENERAL PURPOSEJESD-30 代码：S-XQCC-N24
JESD-609代码：e3长度：4 mm
湿度敏感等级：3功能数量：2
端子数量：24最高工作温度：105 °C
最低工作温度：-40 °C封装主体材料：UNSPECIFIED
封装代码：HVQCCN封装形状：SQUARE
封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：260
认证状态：Not Qualified最大接收延迟：
座面最大高度：1 mm最大供电电压：5.25 V
最小供电电压：3 V标称供电电压：5 V
表面贴装：YES技术：BIPOLAR
温度等级：INDUSTRIAL端子面层：Matte Tin (Sn)
端子形式：NO LEAD端子节距：0.5 mm
端子位置：QUAD处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：4 mmBase Number Matches：1

ADA4939-2YCPZ-R2 数据手册

 浏览型号ADA4939-2YCPZ-R2的Datasheet PDF文件第17页浏览型号ADA4939-2YCPZ-R2的Datasheet PDF文件第18页浏览型号ADA4939-2YCPZ-R2的Datasheet PDF文件第19页浏览型号ADA4939-2YCPZ-R2的Datasheet PDF文件第21页浏览型号ADA4939-2YCPZ-R2的Datasheet PDF文件第22页浏览型号ADA4939-2YCPZ-R2的Datasheet PDF文件第23页 
ADA4939-1/ADA4939-2  
2. In order to match the 50 Ω source resistance, the termi-  
nation resistor, RT, is calculated using RT||300 Ω = 50 Ω.  
The closest standard 1% value for RT is 60.4 Ω.  
It is useful to point out two effects that occur with a  
terminated input. The first is that the value of RG is increased  
in both loops, lowering the overall closed-loop gain. The  
second is that VTH is a little larger than 1 V p-p, as it would  
be if RT = 50 Ω. These two effects have opposite impacts on  
the output voltage, and for large resistor values in the feedback  
loops (~1 kΩ), the effects essentially cancel each other out.  
For small RF and RG, however, the diminished closed-loop  
gain is not canceled completely by the increased VTH. This  
can be seen by evaluating Figure 49.  
R
F
400Ω  
+V  
R
50Ω  
IN  
S
R
R
S
G
50Ω  
200Ω  
R
60.4Ω  
T
V
S
V
OCM  
ADA4939  
R
V
OUT, dm  
2V p-p  
L
R
G
200Ω  
The desired differential output in this example is 2 V p-p  
because the terminated input signal was 1 V p-p and the  
closed-loop gain = 2. The actual differential output voltage,  
however, is equal to (1.09 V p-p)(400/227.4) = 1.92 V p-p.  
To obtain the desired output voltage of 2 V p-p, a final gain  
adjustment can be made by increasing RF without modifying  
any of the input circuitry. This is discussed in Step 4.  
–V  
S
R
F
400Ω  
Figure 47. Adding Termination Resistor RT  
3. It can be seen from Figure 47 that the effective RG in the  
upper feedback loop is now greater than the RG in the  
lower loop due to the addition of the termination resistors.  
To compensate for the imbalance of the gain resistors,  
a correction resistor (RTS) is added in series with RG in the  
lower loop. RTS is equal to the Thevenin equivalent of the  
source resistance RS and the termination resistance RT and  
is equal to RS||RT.  
4. The feedback resistor value is modified as a final gain  
adjustment to obtain the desired output voltage.  
To make the output voltage VOUT = 2 V p-p, RF must be  
calculated using the following formula:  
RF =  
R
(
Desired VOUT,dm  
(
) RG + RTS  
)
2VP−P )(227.4Ω  
( )  
= = 417Ω  
R
S
TH  
50Ω  
R
60.4Ω  
27.4Ω  
T
VTH  
1.09VP−P  
V
V
S
TH  
2V p-p  
1.09V p-p  
The closest standard 1 % values to 417 Ω are 412 Ω and  
422 Ω. Choosing 422 Ω gives a differential output voltage  
of 2.02 V p-p.  
Figure 48. Calculating the Thevenin Equivalent  
RTS = RTH = RS||RT = 27.4 Ω. Note that VTH is greater than  
1 V p-p, which was obtained with RT = 50 Ω. The modified  
circuit with the Thevenin equivalent of the terminated source  
and RTS in the lower feedback loop is shown in Figure 49.  
The final circuit is shown in Figure 50.  
R
F
422Ω  
+V  
1V p-p  
S
R
F
R
R
S
G
400Ω  
+V  
50Ω  
200Ω  
R
60.4Ω  
T
V
S
S
V
OUT, dm  
V
OCM  
ADA4939  
R
2V p-p  
L
2.02V p-p  
R
R
TH  
G
R
G
27.4Ω  
200Ω  
200Ω  
R
27.4Ω  
V
TS  
TH  
V
OCM  
V
OUT, dm  
ADA4939  
R
1.09V p-p  
L
–V  
S
R
G
R
F
200Ω  
R
27.4Ω  
TS  
422Ω  
–V  
S
Figure 50. Terminated Single-Ended-to-Differential System with G = 2  
R
F
400Ω  
Figure 49. Thevenin Equivalent and Matched Gain Resistors  
Figure 49 presents a tractable circuit with matched  
feedback loops that can be easily evaluated.  
Rev. 0 | Page 20 of 24  
 
 
 
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中文翻译

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ADA4939-2YCPZ-R2 替代型号

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完全替代

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