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參數資料
| 型號： | TLC2543-EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TLC2543 Evaluation Module(TLC2543評估板) |
| 中文描述： | 器TLC2543評估模塊（器TLC2543評估板） |
| 文件頁數： | 27/52頁 |
| 文件大小： | 231K |
| 代理商： | TLC2543-EVM |
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Grounding Considerations
2-13
Hardware Description and Operation
2.5
Grounding Considerations
This section explains the grounding techniques that should be considered
when designing or configuring systems using analog devices such as the
ADC.
2.5.1
Grounding Problems
When designing analog circuits that share a ground with digital and high
current power supplies, the voltage drop along the high current paths must be
taken into account. This voltage drop is a result of the current flowing through
the greater-than-zero resistance of the current path, and/or high frequency
current transients flowing through the greater-than-zero inductance of a
current path.
If the signal ground is connected to the power supply ground at a location
where excessive power currents may flow through the analog ground, the
voltage drop is injected into the signal ground and appears as part of the signal,
thus causing an error.
2.5.2
Using a Single Ground Point
For low frequency circuits, usually below 100 kHz, the solution is to establish
a single ground point on the PC board and connect all grounds individually to
that point (the EVM single ground point is at the GND terminal of the power
supply connector). By using this method, currents flowing along any one path
to ground do not inject error voltages in any other ground path.
2.5.3
A Practical Approach
As a practical implementation, however, it may not be reasonable to run a
separate ground trace for each component that connects to ground. There-
fore, the next best approach is to group the higher current grounds (such as
the power supply and digital grounds) together and run them to the central PC
board ground point, while still maintaining separate ground paths for the
analog grounds.
An analysis of current flow paths within the analog section gives an indication
of which grounded components could be grouped together into a common
ground path and which should be kept separate. For instance, on the EVM,
it would be reasonable to use a common path for the TLC2543 REF– terminal,
the TL1431 anode, and the grounded side of R23. This is because the only
significant current flow is through the TL1431 (approximately 1 mA) and is not
enough to cause a significant error. (A 1/2 LSB error at a reference voltage of
4.1 V would be approximately 0.5 mV, so the ground trace would have to be
in excess of 0.5
to cause such an error.)
If all of the input signals are low current, such as the optical sensor (approxi-
mately 2 mA), the temperature sensor (approximately 1 mA), and the poten-
tiometer (approximately 0.25 mA), it may be reasonable to use a common
ground trace. (As always, wider trace widths are desirable to keep the resis-
tance low.) Whenever high currents are associated with any input signal,
always use a separate PC board trace directly to the central ground point
location.
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相關代理商/技術參數 |
參數描述 |
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| TLC2543IDB | 功能描述:模數轉換器 - ADC 12Bit 66kSPS Ser Out Prog MSB/LSB First RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLC2543IDBG4 | 功能描述:模數轉換器 - ADC 12Bit 66kSPS Ser Out Prog MSB/LSB First RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLC2543IDBR | 功能描述:模數轉換器 - ADC 12Bit 66kSPS Ser Out Prog MSB/LSB First RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLC2543IDBRG4 | 功能描述:模數轉換器 - ADC 12Bit 66kSPS Ser Out Prog MSB/LSB First RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| TLC2543IDBRG4Q1 | 功能描述:模數轉換器 - ADC 12B 66kSPS ADC Ser. Out RoHS:否 制造商:Texas Instruments 通道數量:2 結構:Sigma-Delta 轉換速率: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 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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