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TC9400E/PD PDF预览

TC9400E/PD

更新时间： 2024-02-04 12:53:26
品牌 Logo 应用领域
美国微芯 - MICROCHIP 转换器
页数 文件大小 规格书
20页 504K
描述
IC,VOLTAGE-TO-FREQUENCY CONVERTER,CMOS,DIP,14PIN

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TC9400E/PD 技术参数

生命周期：Obsolete零件包装代码：DIP
包装说明：SDIP, SDIP24,.3针数：24
Reach Compliance Code：unknown风险等级：5.73
转换器类型：D/A CONVERTER输入位码：BINARY
输入格式：SERIALJESD-30 代码：R-PDIP-T24
长度：22 mm位数：1
功能数量：1端子数量：24
最高工作温度：85 °C最低工作温度：-35 °C
封装主体材料：PLASTIC/EPOXY封装代码：SDIP
封装等效代码：SDIP24,.3封装形状：RECTANGULAR
封装形式：IN-LINE, SHRINK PITCH电源：5 V
认证状态：Not Qualified座面最大高度：4.5 mm
子类别：Other Converters最大压摆率：40 mA
标称供电电压：5 V表面贴装：NO
技术：CMOS温度等级：OTHER
端子形式：THROUGH-HOLE端子节距：1.778 mm
端子位置：DUAL宽度：7.62 mm
Base Number Matches：1

TC9400E/PD 数据手册

 浏览型号TC9400E/PD的Datasheet PDF文件第4页浏览型号TC9400E/PD的Datasheet PDF文件第5页浏览型号TC9400E/PD的Datasheet PDF文件第6页浏览型号TC9400E/PD的Datasheet PDF文件第8页浏览型号TC9400E/PD的Datasheet PDF文件第9页浏览型号TC9400E/PD的Datasheet PDF文件第10页 
TC9400/9401/9402  
input is balanced out by fixed charges from the refer-  
ence voltage. As the input voltage is increased, the  
number of reference pulses required to maintain bal-  
ance increases, which causes the output frequency to  
also increase. Since each charge increment is fixed, the  
increase in frequency with voltage is linear. In addition,  
the accuracy of the output pulse width does not directly  
affect the linearity of the V/F. The pulse must simply be  
long enough for full charge transfer to take place.  
3.0  
3.1  
DETAILED DESCRIPTION  
Voltage-to-Frequency (V/F) Circuit  
Description  
The TC9400 V/F converter operates on the principal of  
charge balancing. The operation of the TC9400 is eas-  
ily understood by referring to Figure 3-1. The input volt-  
age (V ) is converted to a current (I ) by the input  
IN  
IN  
resistor. This current is then converted to a charge on  
the integrating capacitor and shows up as a linearly  
decreasing voltage at the output of the Op Amp. The  
lower limit of the output swing is set by the threshold  
detector, which causes the reference voltage to be  
applied to the reference capacitor for a time period long  
enough to charge the capacitor to the reference volt-  
age. This action reduces the charge on the integrating  
The TC9400 contains a "self-start" circuit to ensure the  
V/F converter always operates properly when power is  
first applied. In the event that, during power-on, the Op  
Amp output is below the threshold and C  
is already  
REF  
charged, a positive voltage step will not occur. The Op  
Amp output will continue to decrease until it crosses the  
-3.0V threshold of the "self-start" comparator. When  
this happens, an internal resistor is connected to the  
Op Amp input, which forces the output to go positive  
until the TC9400 is in its Normal Operating mode.  
capacitor by a fixed amount (q = C  
x V  
), causing  
REF  
REF  
the Op Amp output to step up a finite amount.  
At the end of the charging period, C is shorted out.  
REF  
The TC9400 utilizes low power CMOS processing for  
low input bias and offset currents, with very low power  
dissipation. The open drain N-channel output FETs  
provide high voltage and high current sink capability.  
This dissipates the charge stored on the reference  
capacitor, so that when the output again crosses zero,  
the system is ready to recycle. In this manner, the con-  
tinued discharging of the integrating capacitor by the  
FIGURE 3-1:  
10Hz TO 10kHz V/F CONVERTER  
+5V  
+
5V  
14  
V
R
10kΩ  
L
DD  
F
Threshold  
OUT  
8
11  
Detect  
3µsec  
Delay  
+
5V  
Threshold  
Detector  
R
10kΩ  
L
F
/2  
OUT  
10  
9
Self-  
Start  
÷2  
-3V  
12 AMP OUT  
Output  
Common  
V
OUT  
REF  
5
20kΩ  
C
INT  
820pF  
TC9400  
TC9401  
TC9402  
C
180pF  
REF  
12pF  
R
IN  
1MΩ  
INPUT  
60pF  
I
IN  
3
V
IN  
–
+5V  
Op Amp  
+
Zero Adjust  
0V –10V  
50kΩ  
510kΩ  
2
V
V
7
I
GND  
6
SS  
REF  
BIAS  
-5V  
Offset  
1
4
10kΩ  
R
Adjust  
BIAS  
100kΩ  
Reference Voltage  
(Typically -5V)  
-5V  
2002 Microchip Technology Inc.  
DS21483B-page 7  
1...45678910...20

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