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ADA4927-1 PDF预览

ADA4927-1

更新时间： 2024-01-20 12:45:35
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 840K
描述
Ultralow Distortion Current Feedback Differential ADC Driver

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ADA4927-1 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Active零件包装代码：QFN
包装说明：HVQCCN,针数：16
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.41
Is Samacsys：N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 PURPOSE
JESD-30 代码：S-XQCC-N16JESD-609代码：e3
长度：3 mm湿度敏感等级：3
功能数量：1端子数量：16
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：11 V最小供电电压：4.5 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：40
宽度：3 mmBase Number Matches：1

ADA4927-1 数据手册

 浏览型号ADA4927-1的Datasheet PDF文件第16页浏览型号ADA4927-1的Datasheet PDF文件第17页浏览型号ADA4927-1的Datasheet PDF文件第18页浏览型号ADA4927-1的Datasheet PDF文件第20页浏览型号ADA4927-1的Datasheet PDF文件第21页浏览型号ADA4927-1的Datasheet PDF文件第22页 
ADA4927-1/ADA4927-2  
R
F
For an unbalanced, single-ended input signal (see Figure 49),  
the input impedance is  
348Ω  
+V  
R
IN  
464Ω  
S
⎛
⎜
⎞
⎟
R
R
S
G
RG  
RF  
RG + RF  
50Ω  
348Ω  
⎜
⎜
⎟
⎟
RIN, SE  
=
V
S
V
OCM  
ADA4927  
R
V
OUT, dm  
2V p-p  
L
1−  
⎜
⎟
2×  
(
)
R
G
⎝
⎠
348Ω  
R
F
–V  
S
+V  
R
S
IN, SE  
R
F
R
348Ω  
G
Figure 50. Calculating Single-Ended Input Impedance RIN  
V
OCM  
ADA4927  
R
V
OUT, dm  
L
2. To match the 50 ꢁ source resistance, the termination  
resistor, RT, is calculated using RT||464 ꢁ = 50 ꢁ. The  
closest standard 1% value for RT is 56.2 ꢁ.  
R
G
–V  
S
R
F
R
F
348Ω  
+V  
R
IN  
50Ω  
Figure 49. The ADA4927 with Unbalanced (Single-Ended) Input  
S
R
R
S
G
The input impedance of the circuit is effectively higher than it  
would be for a conventional op amp connected as an inverter  
because a fraction of the differential output voltage appears at  
the inputs as a common-mode signal, partially bootstrapping  
the voltage across the input resistor RG. The common-mode  
voltage at the amplifier input terminals can be easily determined  
by noting that the voltage at the inverting input is equal to the  
noninverting output voltage divided down by the voltage divider  
formed by RF and RG in the lower loop. This voltage is present at  
both input terminals due to negative voltage feedback and is in  
phase with the input signal, thus reducing the effective voltage  
across RG in the upper loop and partially bootstrapping RG.  
50Ω  
348Ω  
R
56.2Ω  
T
V
S
V
OCM  
ADA4927  
R
V
OUT, dm  
2V p-p  
L
R
G
348Ω  
–V  
S
R
F
348Ω  
Figure 51. Adding Termination Resistor RT  
3.  
It can be seen from Figure 51 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.  
Terminating a Single-Ended Input  
This section deals with how to properly terminate a single-  
ended input to the ADA4927 with a gain of 1, RF = 348 ꢁ, and  
RG = 348 ꢁ. An example using an input source with a terminated  
output voltage of 1 V p-p and a source resistance of 50 ꢁ illustrates  
the four simple steps that must be followed. Note that, because  
the terminated output voltage of the source is 1 V p-p, the open  
circuit output voltage of the source is 2 V p-p. The source shown  
in Figure 50 indicates this open-circuit voltage.  
R
R
S
TH  
50Ω  
R
56.2Ω  
26.5Ω  
T
V
V
S
TH  
1.06V p-p  
2V p-p  
Figure 52. Calculating the Thevenin Equivalent  
1. The input impedance must be calculated using the following  
formula:  
⎛
⎜
⎞
⎟
⎛
⎜
⎞
⎟
RG  
RF  
2×(RG + RF )  
348  
348  
2×( 348 + 348)  
⎜
⎜
⎟
⎟
⎜
⎜
⎟
⎟
RIN =  
=
= 464Ω  
1−  
1−  
⎜
⎟
⎜
⎟
⎝
⎠
⎝
⎠
Rev. 0 | Page 19 of 24  
 
 
 
 
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