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參數(shù)資料
| 型號： | ADS8401 |
| 英文描述： | 16-BIT, 1.25 MSPS, UNIPOLAR INPUT, MICRO POWER SAMPLING ANALOG-TODIGITAL CONVERTER WITH PARALLEL INTERFACE AND REFERENCE |
| 中文描述： | 16位，1.25 MSPS的，單極輸入，并行接口和參考微功率取樣類比，TODIGITAL轉(zhuǎn)爐 |
| 文件頁數(shù)： | 23/25頁 |
| 文件大小： | 238K |
| 代理商： | ADS8401 |
ADS8401
SLAS376B
–
DECEMBER 2002
–
REVISED APRIL 2003
www.ti.com
23
LAYOUT
For optimum performance, care should be taken with the physical layout of the ADS8401 circuitry.
As the ADS8401 offers single-supply operation, it is often used in close proximity with digital logic, microcontrollers,
microprocessors, and digital signal processors. The more digital logic present in the design and the higher the
switching speed, the more difficult it is to achieve good performance from the converter.
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. Thus, driving any
single conversion for an n-bit SAR converter, there are at least n
windows
in which large external transient voltages
can affect the conversion result. Such glitches might originate from switching power supplies, nearby digital logic,
or 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.
On average, the ADS8401 draws very little current from an external reference, as the reference voltage is internally
buffered. If the reference voltage is external and originates from an op amp, make sure that it can drive the bypass
capacitor or capacitors without oscillation. A 0.1-
μ
F bypass capacitor and a 1-
μ
F storage capacitor are recommended
from pin 1 (REFIN) directly to pin 48 (REFM). REFM and AGND should be shorted on the same ground plane under
the device.
The AGND and BDGND pins should be connected to a clean ground point. In all cases, this should be the analog
ground. Avoid connections which are close to the grounding point of a microcontroller or digital signal processor. If
required, run a ground trace directly from the converter to the power supply entry point. The ideal layout consists of
an analog ground plane dedicated to the converter and associated analog circuitry.
As with the AGND connections, +VA
should be connected to a 5-V power supply plane or trace that is separate from
the connection for digital logic until they are connected at the power entry point. Power to the ADS8401 should be
clean and well bypassed. A 0.1-
μ
F ceramic bypass capacitor should be placed as close to the device as possible.
See Table 2 for the placement of the capacitor. In addition, a 1-
μ
F to 10-
μ
F capacitor is recommended. In some
situations, additional bypassing may be required, such as a 100-
μ
F electrolytic capacitor or even a Pi filter made up
of inductors and capacitors
—
all designed to essentially low-pass filter the 5-V supply, removing the high frequency
noise.
Table 2. Power Supply Decoupling Capacitor Placement
POWER SUPPLY PLANE
SUPPLY PINS
CONVERTER ANALOG SIDE
CONVERTER DIGITAL SIDE
Pin pairs that require shortest path to decoupling capacitors
(4,5), (8,9), (10,11), (13,15),
(43,44), (45,46)
(24,25), (34, 35)
Pins that require no decoupling
12, 14
37
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參數(shù)描述 |
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| ADS8401EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS8401 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 |
| ADS8401IBPFBR | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 Bit 1.25MSPS Parallel W Ref 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 |
| ADS8401IBPFBRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 Bit 1.25MSPS Parallel W Ref 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 |
| ADS8401IBPFBT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 Bit 1.25MSPS Parallel W Ref 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 |
| ADS8401IBPFBTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16 Bit 1.25MSPS Parallel W Ref 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 |
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