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ADA4937-2YCPZ-R7 PDF预览

ADA4937-2YCPZ-R7

更新时间： 2024-01-09 11:05:27
品牌 Logo 应用领域
亚德诺 - ADI 驱动接口集成电路驱动器
页数 文件大小 规格书
28页 629K
描述
Ultralow Distortion Differential ADC Driver (Dual)

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ADA4937-2YCPZ-R7 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Active零件包装代码：QFN
包装说明：4 X 4 MM, ROHS COMPLIANT, MO-220VGGD-2, LFCSP-24针数：24
Reach Compliance Code：unknown风险等级：5.5
差分输出：YES驱动器位数：2
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
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：3.3 V
表面贴装：YES技术：BIPOLAR
温度等级：INDUSTRIAL端子面层：MATTE TIN
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：4 mmBase Number Matches：1

ADA4937-2YCPZ-R7 数据手册

 浏览型号ADA4937-2YCPZ-R7的Datasheet PDF文件第21页浏览型号ADA4937-2YCPZ-R7的Datasheet PDF文件第22页浏览型号ADA4937-2YCPZ-R7的Datasheet PDF文件第23页浏览型号ADA4937-2YCPZ-R7的Datasheet PDF文件第25页浏览型号ADA4937-2YCPZ-R7的Datasheet PDF文件第26页浏览型号ADA4937-2YCPZ-R7的Datasheet PDF文件第27页 
ADA4937-1/ADA4937-2  
Data Sheet  
The circuit in Figure 66 shows a simplified front-end connection  
for an ADA4937-1 driving an AD9246, 14-bit, 125 MSPS ADC.  
The AD9246 achieves optimum performance when driven  
differentially. The ADA4937-1/ADA4937-2 perform the single-  
ended-to-differential conversion, eliminating the need for a  
transformer to drive the ADC.  
The AD9246 is set for a 2 V p-p full-scale input by connecting  
the SENSE pin to AGND. The inputs of the AD9246 are biased  
at 1 V by connecting the CML output, as shown in Figure 66.  
The circuit was tested with a −1 dBFS signal at various frequencies.  
Figure 65 shows a plot of the second- and third-order harmonic  
distortion (HD2/HD3) vs. frequency.  
The ADA4937-1/ADA4937-2 are configured with a single 5 V  
supply and a gain of ~2 V/V for a single-ended input to  
differential output. The 76.8 ꢀ termination resistor, in parallel  
with the single-ended input impedance of 137 ꢀ, provides a 50 ꢀ  
ac termination for the source. The additional 30 ꢀ (120 ꢀ total) at  
the inverting input balances the parallel ac impedance of the  
50 ꢀ source and the termination resistor driving the  
noninverting input.  
–75  
G = +2  
–80  
HD3  
–85  
HD2  
–90  
The signal generator has a symmetric, ground-referenced bipolar  
output. The VOCM pin of the ADA4937-1/ADA4937-2 remains  
unconnected; therefore, the internal pull-ups set the output  
common-mode voltage to midsupply. A portion of this is fed back  
to the summing nodes, biasing −IN and +IN at 0.55 V. For a  
common-mode voltage of 2.5 V, each ADA4937-1/ADA4937-2  
output swings between 2.0 V and 3.0 V, providing a 2 V p-p  
differential output.  
–95  
–100  
0
20  
40  
60  
80  
100  
120  
FREQUENCY (MHz)  
Figure 65. HD2/HD3 for Combination of ADA4937-1/ADA4937-2 and  
AD9246 ADC  
The output is ac-coupled to a single-pole, low-pass filter. This  
reduces the noise bandwidth of the amplifier and provides some  
level of isolation from the switched capacitor inputs of the ADC.  
200Ω  
1.8V  
5V  
76.8Ω  
10µF  
10µF  
50Ω  
33Ω  
10pF  
90Ω  
AVDD DRVDD  
VIN–  
+
200Ω  
200Ω  
D13 TO  
V
IN  
AD9246  
D0  
ADA4937-1  
10µF  
90Ω  
VIN+  
AGND SENSE CML  
33Ω  
10µF  
50Ω  
76.8Ω  
200Ω  
Figure 66. Driving an AD9246, 14-Bit, 125 MSPS ADC  
Rev. F | Page 24 of 28  
 
 
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