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AD7741BR

更新时间： 2024-01-15 23:03:04
品牌 Logo 应用领域
亚德诺 - ADI 转换器模拟特殊功能转换器光电二极管
页数 文件大小 规格书
12页 134K
描述
Single and Multichannel, Synchronous Voltage-to-Frequency Converters

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AD7741BR 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：SOIC
包装说明：SOP,针数：8
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.29
转换器类型：VOLTAGE TO FREQUENCY CONVERTERJESD-30 代码：R-PDSO-G8
JESD-609代码：e3长度：4.9 mm
最大线性误差 (EL)：0.024%湿度敏感等级：1
功能数量：1端子数量：8
最大工作频率：6.144 MHz最高工作温度：105 °C
最低工作温度：-40 °C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
最大正输入电压：2.5 V认证状态：Not Qualified
座面最大高度：2.59 mm最大供电电压：5.25 V
最小供电电压：4.75 V标称供电电压：5 V
表面贴装：YES技术：CMOS
温度等级：INDUSTRIAL端子面层：Matte Tin (Sn)
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：30
宽度：3.9 mmBase Number Matches：1

AD7741BR 数据手册

 浏览型号AD7741BR的Datasheet PDF文件第5页浏览型号AD7741BR的Datasheet PDF文件第6页浏览型号AD7741BR的Datasheet PDF文件第7页浏览型号AD7741BR的Datasheet PDF文件第9页浏览型号AD7741BR的Datasheet PDF文件第10页浏览型号AD7741BR的Datasheet PDF文件第11页 
AD7741/AD7742  
Table II. AD7741/AD7742 Input Range Selection  
VIN(Min)  
VIN(Max)  
fOUT = 0.45 fCLKIN  
UNI/BIP  
GAIN  
Gain, G  
fOUT = 0.05 fCLKIN  
Part  
N/A  
0
0
1
1
N/A  
0
1
0
1
X1  
X1  
X2  
X1  
X2  
0
+VREF  
+VREF  
+VREF/2  
+VREF  
AD7741  
AD7742  
AD7742  
AD7742  
AD7742  
–VREF  
–VREF/2  
0
0
+VREF/2  
OUTPUT  
FREQUENCY  
As can be seen from Table II, the AD7741 has one input range  
configuration whereas the AD7742 has unipolar/bipolar as  
well as gain options depending on the status of the GAIN  
and UNI/BIP pins.  
f
OUT  
f
MAX  
OUT  
(0.45 f  
)
CLKIN  
The transfer function for the AD7741 is shown in Figure 3.  
Figure 4 shows the AD7742 transfer function for unipolar input  
range configuration while the AD7742 transfer function for  
bipolar input range configuration is shown in Figure 5.  
f
MIN  
OUT  
OUTPUT  
FREQUENCY  
(0.05 f  
)
CLKIN  
f
OUT  
V
V
REF  
REF  
DIFFERENTIAL  
INPUT VOLTAGE  
–
+
GAIN  
GAIN  
f
MAX  
OUT  
(0.45 f  
)
CLKIN  
Figure 5. AD7742 Transfer Characteristic for Bipolar  
Differential Input Range: –VREF/Gain to +VREF/Gain; the  
common-mode range must be between +0.5 V and  
VDD – 1.75 V. UNI/BIP pin tied to GND.  
VFC Modulator  
f
MIN  
OUT  
The analog input signal to the AD7741/AD7742 is continu-  
ously sampled by a switched capacitor modulator whose sam-  
pling rate is set by a master clock input that may be supplied  
externally or by a crystal-controlled on-chip clock oscillator.  
However, the input signal is buffered on-chip before being ap-  
plied to the sampling capacitor of the modulator. This isolates  
the sampling capacitor charging currents from the analog input  
pins.  
(0.05 f  
)
CLKIN  
0
REFIN  
INPUT  
VOLTAGE V  
IN  
Figure 3. AD7741 Transfer Characteristic for Input Range  
from 0 to VREF  
OUTPUT  
FREQUENCY  
f
OUT  
This system is a negative feedback loop that tries to keep the net  
charge on the integrator capacitor at zero, by balancing charge  
f
MAX  
OUT  
injected by the input voltage with charge injected by the VREF  
.
(0.45 f  
)
CLKIN  
The output of the comparator provides the digital input for the  
1-bit DAC, so that the system functions as a negative feedback  
loop that tries to minimize the difference signal (see Figure 6).  
CLK  
f
MIN  
INTEGRATOR  
OUT  
(0.05 f  
)
CLKIN  
COMPARATOR  
+
0
1-BIT  
STREAM  
V
REF  
DIFFERENTIAL  
INPUT VOLTAGE  
INPUT  
+
–
⌺
–
+
GAIN  
Figure 4. AD7742 Transfer Characteristic for Unipolar  
Differential Input Range: 0 V to VREF/Gain; the input  
common-mode range must be between +0.5 V and  
+V  
–V  
REF  
REF  
VDD – 1.75 V. UNI/BIP pin tied to VDD  
.
Figure 6. AD7741/AD7742 Modulator Loop  
–8–  
REV. 0  
1...56789101112

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