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VFC110AP

更新时间： 2024-02-02 20:36:08
品牌 Logo 应用领域
德州仪器 - TI 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 200K
描述
High-Frequency VOLTAGE-TO-FREQUENCY CONVERTER

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VFC110AP 技术参数

是否Rohs认证： 不符合生命周期：Transferred
包装说明：CERAMIC, DIP-14Reach Compliance Code：unknown
风险等级：5.82转换器类型：VOLTAGE TO FREQUENCY CONVERTER
JESD-30 代码：R-CDIP-T14JESD-609代码：e0
最大线性误差 (EL)：0.1%最大负电源电压：-18 V
最小负电源电压：-8 V标称负供电电压：-15 V
功能数量：1端子数量：14
最大工作频率：4 MHz最高工作温度：125 °C
最低工作温度：-55 °C封装主体材料：CERAMIC, METAL-SEALED COFIRED
封装代码：DIP封装等效代码：DIP14,.3
封装形状：RECTANGULAR封装形式：IN-LINE
最大正输入电压：10 V电源：+-15 V
认证状态：Not Qualified子类别：Analog Special Function Converters
最大压摆率：16 mA最大供电电压：18 V
最小供电电压：8 V标称供电电压：15 V
表面贴装：NO温度等级：MILITARY
端子面层：Tin/Lead (Sn/Pb)端子形式：THROUGH-HOLE
端子节距：2.54 mm端子位置：DUAL
Base Number Matches：1

VFC110AP 数据手册

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ꢠ ꢡ ꢅ ꢢꢢ ꢣ  
www.ti.com  
SBVS021A − OCTOBER 1988 − REVISED APRIL 2007  
connected to logic ground. The one-shot connection  
(pin 6) is not short-circuit protected. Short-circuits to  
ground may damage the device.  
OPERATION  
Figure 1 shows the connections required for operation at  
a full-scale output frequency of 4MHz. Only power supply  
bypass capacitors and an output pull-up resistor, RPU, are  
required for this mode of operation. A 0V to 10V input  
voltage produces a 0Hz to 4MHz output frequency. The  
internal input resistor, one-shot and integrator capacitors  
set the full-scale output frequency. The input is applied to  
the summing junction of the integrator amplifier through  
the 25kΩ internal input resistor. Pin 14 (the noninverting  
amplifier input) should be referred directly to the negative  
side of VIN. The common-mode range of the integrating  
amplifier is limited to approximately −1V to +1V referred to  
analog ground. This allows the noninverting input to  
Kelvin-sense the common connection of VIN, easily  
accommodating any ground-drop errors. The input  
impedance loading VIN is equal to the input  
resistor—approximately 25kΩ.  
The integrator capacitor’s value does not directly affect the  
output frequency, but determines the magnitude of the  
voltage swing on the integrator’s output. Using a CINT  
equal to COS provides an integrator output swing from 0V  
to approximately 1.5V.  
COMPONENT SELECTION  
Selection of the external resistor and capacitor type is  
important. Temperature drift of an external input resistor  
and one-shot capacitor will affect temperature stability of  
the output frequency. NPO ceramic capacitors will  
normally produce the best results. Silver-mica types will  
result in slightly higher drift, but may be adequate in many  
applications. A low temperature coefficient film resistor  
should be used for RIN.  
The integrator capacitor serves as a charge bucket, where  
charge is accumulated from the input, VIN, and that charge  
is drained during the one-shot period. While the size of the  
bucket (capacitor value) is not critical, it must not leak.  
Capacitor leakage or dielectric absorption can affect the  
linearity and offset of the transfer function. High-quality  
ceramic capacitors can be used for values less than  
0.01µF. Use caution with higher value ceramic capacitors.  
High-k ceramic capacitors may have voltage  
nonlinearities which can degrade overall linearity.  
Polystyrene, polycarbonate, or mylar film capacitors are  
superior for high values.  
OPERATION AT LOWER FREQUENCIES  
The VFC110 can be operated at lower frequencies simply  
by limiting the input voltage to less than the nominal 10V  
full-scale input. To maintain a 10V FS input and highest  
accuracy, however, external components are required  
(see Table 1). Small adjustments may be required in the  
nominal values indicated. Integrator and one-shot  
capacitors are added in parallel to internal capacitors.  
Figure 2 illustrates the connections required for 100kHz  
full-scale output. The one-shot capacitor, COS, should be  
+VS  
+15V  
VL  
+5V  
RPU  
NC  
10  
1
12  
11  
Ω
680  
8
fOUT  
50pF(1)  
0MHz to 4MHz  
(1)  
Ω
25k  
2
One−Shot  
14  
0V to  
+10V  
VIN  
Logic Ground  
NC  
7
5
VREF  
4
13  
3
6
NC  
NC  
−
15V  
−
VS  
Analog Ground  
NOTE: (1) Nominal values ( 20%).  
Figure 1. 4MHz Full-Scale Operation  
6
1...3456789...12

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