參數(shù)資料
型號: VCT3801A
廠商: MICRONAS SEMICONDUCTOR HOLDING AG
英文描述: Video/Controller/Teletext IC Family
中文描述: 視頻/控制/圖文電視IC系列
文件頁數(shù): 124/172頁
文件大?。?/td> 2243K
代理商: VCT3801A
VCT 38xxA
ADVANCE INFORMATION
124
Micronas
5.17.3.Measurement Errors
The result of the conversion mirrors the voltage poten-
tial of the sampling capacitance (typically 15 pF) at the
end of the sampling time. This capacitance has to be
charged by the source through the source impedance
within the sampling time period. To avoid measure-
ment errors, system design has to make sure that at
the end of the sampling period, the potential error on
the sampling capacitance is less than
±
0.1 LSB.
Measurement errors may occur, when the voltage of
high-impedance sources has to be measured:
– To reduce these errors, the sampling time may be
increased by programming the field TSAMP in regis-
ter AD1.
– In cases where high-impedance sources are only
rarely sampled, a 100-nF capacitor from the input to
GNDS is a sufficient measure to ensure that the
potential on the sampling capacitance reaches the
full source potential, even with the shortest sampling
time.
– In some high-impedance applications a charge
pumping effect may influence the measurement
result when two sources are measured alternatingly.
5.17.4.Comparator
In addition to the A/D converter the module contains a
comparator. The level at the A/D converter input is
compared to VSUPS/2. The state of the comparator
output can be read at flag CMPO in register AD0.
The interrupt source output of this module is routed to
the Interrupt Controller logic. The CMPO interrupt
source is gated with an internal clock. This is the rea-
son why interrupts are generated as long as the level
at the comparator is lower than the internal reference.
相關(guān)PDF資料
PDF描述
VCU2133 High-Speed coder/decoder IC
VCX2150A Surface mount 15.88 mm SQ (.625 SQ)
VCX2154A Surface mount 15.88 mm SQ (.625 SQ)
VCXO-105N VCXO
VCXO-199 VCXO
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
VCT3802A 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family
VCT3803A 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family
VCT3804A 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family
VCT3811A 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family
VCT3831A 制造商:MICRONAS 制造商全稱:MICRONAS 功能描述:Video/Controller/Teletext IC Family