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參數(shù)資料
| 型號： | ADS1251 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | "ResolutionPlus 24-Bit |
| 中文描述： | ResolutionPlus 24 位 20kHz 低功耗模數(shù)轉換器 |
| 文件頁數(shù)： | 6/17頁 |
| 文件大?。?/td> | 323K |
| 代理商： | ADS1251 |
ADS1251
14
SBAS184A
www.ti.com
ISOLATION
The serial interface of the ADS1251 provides for simple
isolation methods. The CLK signal can be local to the
ADS1251, which then only requires two signals (SCLK, and
DOUT/DRDY) to be used for isolated data acquisition.
LAYOUT
POWER SUPPLY
The power supply must be well-regulated and low-noise. For
designs requiring very high resolution from the ADS1251,
power supply rejection will be a concern. Avoid running
digital lines under the device as they may couple noise onto
the die. High-frequency noise can capacitively couple into
the analog portion of the device and will alias back into the
passband of the digital filter, affecting the conversion result.
This clock noise will cause an offset error.
GROUNDING
The analog and digital sections of the system design should
be carefully and cleanly partitioned. Each section should
have its own ground plane with no overlap between them.
GND should be connected to the analog ground plane, as
well as all other analog grounds. Do not join the analog and
digital ground planes on the board, but instead connect the
two with a moderate signal trace. For multiple converters,
connect the two ground planes at one location as central to
all of the converters as possible. In some cases, experimen-
tation may be required to find the best point to connect the
two planes together. The printed circuit board can be de-
signed to provide different analog/digital ground connections
via short jumpers. The initial prototype can be used to
establish which connection works best.
DECOUPLING
Good decoupling practices should be used for the ADS1251
and for all components in the design. All decoupling capaci-
tors, and specifically the 0.1
F ceramic capacitors, should be
placed as close as possible to the pin being decoupled. A
1
F to 10F capacitor, in parallel with a 0.1F ceramic
capacitor, should be used to decouple VDD to GND.
SYSTEM CONSIDERATIONS
The recommendations for power supplies and grounding will
change depending on the requirements and specific design
of the overall system. Achieving 24 bits of noise performance
is a great deal more difficult than achieving 12 bits of noise
performance. In general, a system can be broken up into four
different stages:
Analog Processing
Analog Portion of the ADS1251
Digital Portion of the ADS1251
Digital Processing
For the simplest system consisting of minimal analog signal
processing (basic filtering and gain), a microcontroller, and
one clock source, one can achieve high resolution by power-
ing all components from a common power supply. In addi-
tion, all components could share a common ground plane.
Thus, there would be no distinctions between analog power
and ground,
and digital power and ground. The layout
should still include a power plane, a ground plane, and
careful decoupling. In a more extreme case, the design could
include:
Multiple ADS1251s
Extensive Analog Signal Processing
One or More Microcontrollers, Digital Signal Processors,
or Microprocessors
Many Different Clock Sources
Interconnections to Various Other Systems
High resolution will be very difficult to achieve for this design.
The approach would be to break the system into as many
different parts as possible. For example, each ADS1251 may
have its own analog processing front end.
DEFINITION OF TERMS
An attempt has been made to use consistent terminology in
this data sheet. In that regard, the definition of each term is
provided here:
Analog-Input Differential Voltage—for an analog signal
that is fully differential, the voltage range can be compared to
that of an instrumentation amplifier. For example, if both
analog inputs of the ADS1251 are at 2.048V, the differential
voltage is 0V. If one analog input is at 0V and the other
相關PDF資料 |
PDF描述 |
|---|---|
| ADS5102IPFBR | 1.8-V ANALOG SUPPLY, 10-BIT, 65/40 MSPS ANALOG-TO-DIGITAL CONVERTERS WITH INTERNAL REFERENCE |
| ADS5103 | "10 Bit |
| ADS5103CPFB | 1.8-V ANALOG SUPPLY, 10-BIT, 65/40 MSPS ANALOG-TO-DIGITAL CONVERTERS WITH INTERNAL REFERENCE |
| ADS5103CPFBR | 1.8-V ANALOG SUPPLY, 10-BIT, 65/40 MSPS ANALOG-TO-DIGITAL CONVERTERS WITH INTERNAL REFERENCE |
| ADS5103EVM | 1.8-V ANALOG SUPPLY, 10-BIT, 65/40 MSPS ANALOG-TO-DIGITAL CONVERTERS WITH INTERNAL REFERENCE |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| ADS1251EVM | 功能描述:數(shù)據(jù)轉換 IC 開發(fā)工具 ADS1251 ADC Eval Mod RoHS:否 制造商:Texas Instruments 產品: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 |
| ADS1251U | 功能描述:模數(shù)轉換器 - ADC ResolutionPlus 24Bit 20kHz Lo-Power RoHS:否 制造商:Texas Instruments 通道數(shù)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 |
| ADS1251U | 制造商:Texas Instruments 功能描述:IC 24BIT ADC SMD 1251 SOIC8 |
| ADS1251U | 制造商:Texas Instruments 功能描述:IC ADC 24BIT 20KSPS SOIC-8 |
| ADS1251U/2K5 | 功能描述:模數(shù)轉換器 - ADC ResolutionPlus 24Bit 20kHz Lo-Power RoHS:否 制造商:Texas Instruments 通道數(shù)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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