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| 型號： | AMC7820 |
| 英文描述： | Analog Monitoring and Control Circuitry |
| 中文描述： | 模擬監(jiān)測和控制電路 |
| 文件頁數(shù)： | 26/28頁 |
| 文件大小： | 468K |
| 代理商： | AMC7820 |
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AMC7820
SBAS231B
www.ti.com
26
LAYOUT
For optimum performance, care should be taken with the
physical layout of the AMC7820 circuitry. The basic SAR
architecture is sensitive to glitches or sudden changes on the
power supply, reference, ground connections, and digital
inputs that occur just prior to latching the output of the analog
comparator of the ADC. Therefore, during any single conver-
sion for an
‘
n-bit
’
SAR converter, there are n
‘
windows
’
in
which large external transient voltages can easily affect the
conversion result. Such glitches might originate from switch-
ing power supplies, nearby digital logic, and high-power
devices. The degree of error in the digital output depends on
the reference voltage, layout, and the exact timing of the
external event.
With this in mind, power to the AMC7820 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 AV
DD
and the power supply is high.
It is recommended to install a reference bypass capacitor
(1
μ
F) between the EXT_REF_IN pin and analog ground
when internal reference is used. If an external reference
voltage originates from an op amp, make sure that it can
drive any bypass capacitor that is used without oscillation.
The AMC7820 architecture offers no inherent rejection of
noise or voltage variation coming from an external reference
input. Any noise and ripple from the reference will appear
directly in the analog and digital results.
The AGND and DGND pins should be connected to a clean
ground point. In many cases, this will be the
“
analog
”
ground.
Avoid connections that 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 AMC7820 and
associated external analog circuitry.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AMC7820EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 AMC7820 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
| AMC7820Y | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ANALOG MONITORING AND CONTROL |
| AMC7820Y/250 | 功能描述:數(shù)據(jù)轉(zhuǎn)換系統(tǒng) Analog Monitoring & Control Circuitry RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率:0.001 MSPs 分辨率:24 bit 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| AMC7820Y/250G4 | 功能描述:數(shù)據(jù)轉(zhuǎn)換系統(tǒng) Analog Monitoring & Control Circuitry RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率:0.001 MSPs 分辨率:24 bit 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| AMC7820Y/2K | 功能描述:數(shù)據(jù)轉(zhuǎn)換系統(tǒng) Analog Monitoring & Control Circuitry RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率:0.001 MSPs 分辨率:24 bit 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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