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參數(shù)資料
| 型號： | ADS7843 |
| 元件分類： | 通用總線功能 |
| 英文描述： | CMOS 8-Stage Presettable 2-Decade BCD Synchronous Down Counter 16-TSSOP -55 to 125 |
| 中文描述： | 觸摸屏控制器 |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 163K |
| 代理商： | ADS7843 |
12
ADS7843
large external transient voltages can easily affect the conver-
sion result. Such glitches might originate from switching
power supplies, nearby digital logic, and high power de-
vices. The degree of error in the digital output depends on
the reference voltage, layout, and the exact timing of the
external event. The error can change if the external event
changes in time with respect to the DCLK input.
With this in mind, power to the ADS7843 should be clean
and well bypassed. A 0.1
μ
F ceramic bypass capacitor should
be placed as close to the device as possible. A 1
μ
F to 10
μ
F
capacitor may also be needed if the impedance of the
connection between +V
CC
and the power supply is high.
The reference should be similarly bypassed with a 0.1
μ
F
capacitor. If the reference voltage originates from an op
amp, make sure that it can drive the bypass capacitor without
oscillation. The ADS7843 draws very little current from the
reference on average, but it does place larger demands on the
reference circuitry over short periods of time (on each rising
edge of DCLK during a conversion).
The ADS7843 architecture offers no inherent rejection of
noise or voltage variation in regards to the reference input.
This is of particular concern when the reference input is tied
to the power supply. Any noise and ripple from the supply
will appear directly in the digital results. While high fre-
quency noise can be filtered out, voltage variation due to line
frequency (50Hz or 60Hz) can be difficult to remove.
The GND pin should be connected to a clean ground point.
In many cases, this will be the “analog” ground. Avoid
connections which are too near the grounding point of a
microcontroller or digital signal processor. If needed, run a
ground trace directly from the converter to the power supply
entry or battery connection point. The ideal layout will
include an analog ground plane dedicated to the converter
and associated analog circuitry.
In the specific case of use with a resistive touch screen, care
should be taken with the connection between the converter
and the touch screen. Since resistive touch screens have
fairly low resistance, the interconnection should be as short
and robust as possible. Longer connections will be a source
of error, much like the on-resistance of the internal switches.
Likewise, loose connections can be a source of error when
the contact resistance changes with flexing or vibrations.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS7843E | CMOS 8-Stage Presettable 8-Bit Binary Synchronous Down Counter 16-PDIP -55 to 125 |
| ADS7844 | 12-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS7844E | CMOS 8-Stage Presettable 8-Bit Binary Synchronous Down Counter 16-SO -55 to 125 |
| ADS7844EB | CMOS 8-Stage Presettable 8-Bit Binary Synchronous Down Counter 16-SO -55 to 125 |
| ADS7844N | 12-Bit, 8-Channel Serial Output Sampling ANALOG-TO-DIGITAL CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7843E | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Touch Scrn Ctrlr RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| ADS7843E | 制造商:Texas Instruments 功能描述:IC's |
| ADS7843E/2K5 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 4-wire Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| ADS7843E/2K5G4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 4-wire Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| ADS7843EG4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 4-wire Touch Screen Controller RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
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