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VFC320CM PDF预览

VFC320CM

更新时间: 2024-02-28 05:16:53
品牌 Logo 应用领域
德州仪器 - TI 转换器模拟特殊功能转换器
页数 文件大小 规格书
12页 234K
描述
Voltage-to-Frequency and Frequency-to-Voltage CONVERTER

VFC320CM 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:METAL CAN, TO-100, 10 PINReach Compliance Code:unknown
风险等级:5.73Is Samacsys:N
转换器类型:VOLTAGE TO FREQUENCY CONVERTERJESD-30 代码:O-MBCY-W10
JESD-609代码:e0最大线性误差 (EL):0.03%
最大负电源电压:-20 V最小负电源电压:-13 V
标称负供电电压:-15 V功能数量:1
端子数量:10最大工作频率:1 MHz
最高工作温度:125 °C最低工作温度:-55 °C
封装主体材料:METAL封装等效代码:CAN10,.23
封装形状:ROUND封装形式:CYLINDRICAL
电源:+-15 V认证状态:Not Qualified
子类别:Analog Special Function Converters最大压摆率:7.5 mA
最大供电电压:20 V最小供电电压:13 V
标称供电电压:15 V表面贴装:NO
技术:BIPOLAR温度等级:MILITARY
端子面层:Tin/Lead (Sn/Pb)端子形式:WIRE
端子位置:BOTTOMBase Number Matches:1

VFC320CM 数据手册

 浏览型号VFC320CM的Datasheet PDF文件第2页浏览型号VFC320CM的Datasheet PDF文件第3页浏览型号VFC320CM的Datasheet PDF文件第4页浏览型号VFC320CM的Datasheet PDF文件第6页浏览型号VFC320CM的Datasheet PDF文件第7页浏览型号VFC320CM的Datasheet PDF文件第8页 
C2  
+VPULL-UP (VPU  
(5V to 15V Typically)  
)
+VCC  
12  
Integrating  
Capacitor  
VOUT  
fIN  
Input Resistor  
R1  
13  
10  
1
Pull-up  
R2  
Input  
Amp  
Resitor  
A
IIN  
14  
e1  
7
Flip-  
flop  
IB  
Comparators  
B
fOUT  
7.5V  
Ref  
Q1  
Constant  
Current Sinks  
(1mA)  
IA  
VIN  
e2  
fOUT  
=
7.5 R1 C1  
Switch  
One-shot  
4
5
11  
Common  
C1  
One-shot  
Capacitor  
VCC  
VIN:  
For Postive Input Voltages use e1, short e2.  
For Negative Input Voltages use e2, short e1.  
For Differental Input Voltages use e1 and e2.  
FIGURE 4. Functional Block Diagram of the VFC320.  
begins to ramp down again before the input amplifier has a  
chance to saturate. In effect the comparators and flip-flop  
form a one-shot whose period is determined by the internal  
reference and a 1mA current sink plus the external capacitor,  
C1. After the one-shot resets, fOUT changes back to logic 0  
and the cycle begins again.  
In the time t1 + t2 the integrator capacitor C2 charges and  
discharges but the net voltage change is zero.  
Thus Q = 0 = IIN t1 + (IIN – IA) t2  
(2)  
(3)  
So that IIN (t1 + t2) = IA t2  
VIN  
1
fOUT  
But since t1 + t2 =  
and IIN  
=
(4), (5)  
(6)  
R1  
The transfer function for the VFC320 is derived for the  
circuit shown in Figure 4. Detailed waveforms are shown in  
Figure 5.  
VIN  
fOUT  
=
IA R2 R2  
1
fOUT  
=
(1)  
In the time t1, IB charges the one-shot capacitor C1 until its  
voltage reaches –7.5V and trips comparator B.  
t1 + t2  
CIN 7.5  
Thus t2 =  
(7)  
(8)  
0V  
IB  
VIN  
IB  
Using (7) in (6) yield fOUT  
=
7.5R1C1 IA  
7.5V  
Since IA = IB the result is  
VIN  
(9)  
fOUT  
=
7.5 R1 C1  
VOUT  
Since the integrating capacitor, C2, affects both the rising  
and falling segments of the ramp voltage, its tolerance and  
temperature coefficient do not affect the output frequency. It  
should, however, have a leakage current that is small com-  
pared to IIN, since this parameter will add directly to the gain  
error of the VFC. C1, which controls the one-shot period,  
should be very precise since its tolerance and temperature  
coefficient add directly to the errors in the transfer function.  
t1  
t2  
FIGURE 5. Integrator and VFC Output Timing.  
VFC320  
SBVS017A  
5

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