參數(shù)資料
型號(hào)： DDC118
英文描述： Octal Current Input 20-Bit Analog-To-Digital Converter
中文描述： 八路電流輸入20位模擬數(shù)字轉(zhuǎn)換器
文件頁(yè)數(shù)： 27/30頁(yè)
文件大?。?/td> 384K
代理商： DDC118
""#
SBAS325A JUNE 2004 REVISED JUNE 2005
www.ti.com
27
Shielding Analog Signal Paths
As with any precision circuit, careful PCB layout ensures
the best performance. It is essential to make short, direct
interconnections
and
capacitance—particularly at the analog input pins. Digital
signals should be kept as far from the analog input signals
as possible on the PCB.
avoid
stray
wiring
Input shielding practices should be taken into
consideration when designing the circuit layout for the
DDC118. The inputs to the DDC118 are high impedance
and extremely sensitive to extraneous noise. Leakage
currents between the PCB traces can exceed the input
bias current of the DDC118 if shielding is not implemented.
Figure 29 illustrates an acceptable approach to this
problem. A PC ground plane is placed around the inputs
of the DDC118. This shield helps minimize coupled noise
into the input pins.
This approach reduces leakage effects by surrounding
these sensitive pins with a low impedance analog ground.
Leakage currents from other portions of the circuit will flow
harmlessly to the low impedance analog ground rather
than into the analog input stage of the DDC118.
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IN4
IN3
Digital I/O and Digital Power
Analog
Ground
Analog
Ground
Analog
Ground
IN2
IN1
37
24
DDC118
IN7
IN8
IN5
IN6
Analog Power
Figure 29. Recommended Shield for DDC118 Layout Design
相關(guān)PDF資料
PDF描述
DDC118IRTCR Octal Current Input 20-Bit Analog-To-Digital Converter
DDC118IRTCT Octal Current Input 20-Bit Analog-To-Digital Converter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DDC118IRTCR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Octal Current-Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
DDC118IRTCRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Octal Current-Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
DDC118IRTCT 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Octal Current-Input 20-Bit RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
DDC118IRTCT 制造商:Texas Instruments 功能描述:IC ADC 20BIT OCTAL 48-VQFN
DDC118IRTCT 制造商:Texas Instruments 功能描述:A/D CONVERTER (A-D) IC ((NW))
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