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參數(shù)資料
| 型號(hào)： | ADS8380IRHPR |
| 英文描述： | 18-BIT, 600-kHz, PSEUDO-DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH SERIAL INTERFACE AND REFERENCE |
| 中文描述： | 18位，600千赫，偽差分輸入，微采樣模數(shù)位串行接口和參考轉(zhuǎn)爐 |
| 文件頁數(shù)： | 25/29頁 |
| 文件大?。?/td> | 1397K |
| 代理商： | ADS8380IRHPR |
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Full I
CC
SDO
BUSY
LSB
SAMPLE
NAP
CONVERT
SAMPLE
LSB+1
MSB
MSB1
HiZ
t
CONV
t
d16
t
d18
I
CC
NAP
Full I
CC
PD = 0
CONVST
CS
CONVST_QUAL
DEVICE
STATE
REFIN
(or REFOUT)
I
CC
LAYOUT
For optimum performance, care should be taken with the physical layout of the ADS8380 circuitry.
ADS8380
SLAS387A–NOVEMBER 2004–REVISED DECEMBER 2004
Figure 55. Device Nap Power Down/Resume
Since the ADS8380 offers single-supply operation, it is often used in close proximity with digital logic,
microcontrollers, microprocessors, and digital signal processors. The more the digital logic in the design and the
higher the switching speed, the greater the need for better layout and isolation of the critical analog signals from
these switching digital signals.
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 the end of sampling and just prior to the latching of the
analog comparator. Such glitches might originate from switching power supplies, nearby digital logic, or high
power devices. Noise during the end of sampling and the latter half of the conversion must be kept to a minimum
(the former half of the conversion is not very sensitive since the device uses a proprietary error correction
algorithm to correct for the transient errors made here).
The degree of error in the digital output depends on the reference voltage, layout, and the exact timing and
degree of the external event.
On average, the ADS8380 draws very little current from an external reference as the reference voltage is
internally buffered. If the reference voltage is external, it must be ensured that the reference source can drive the
bypass capacitor without oscillation. A 0.1-
μ
F bypass capacitor is recommended from pin 8 directly to pin 7
(REFM).
The AGND and BDGND pins should be connected to a clean ground point. In all cases, this should be the
analog
ground. Avoid connections that are too 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 ADS8380
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 3 for the placement of these capacitors. In addition, a 1-
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.
25
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| ADS8380IBRHPR | 18-BIT, 600-kHz, PSEUDO-DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH SERIAL INTERFACE AND REFERENCE |
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參數(shù)描述 |
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| ADS8380IRHPRG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 600KSPS Serial 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 |
| ADS8380IRHPT | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 600KSPS Serial 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 |
| ADS8380IRHPTG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 18-Bit 600KSPS Serial 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 |
| ADS8381 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:18-BIT, 580-kHz, UNIPOLAR INPUT, MICRO POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH PARALLEL INTERFACE |
| ADS8381EVM | 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 ADS8381 Eval Mod RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V |
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