參數(shù)資料
型號(hào)： ADS8517IDWR
廠商： TEXAS INSTRUMENTS INC
元件分類： ADC
英文描述： 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PDSO28
封裝： GREEN, PLASTIC, SOIC-28
文件頁(yè)數(shù)： 10/38頁(yè)
文件大?。?/td> 948K
代理商： ADS8517IDWR
External Data Clock
SLAS527A – SEPTEMBER 2008 – REVISED JUNE 2009 ................................................................................................................................................. www.ti.com
To use an external data clock, tie EXT/INT (pin 8) high. The external data clock is not and cannot be
synchronized with the internal conversion clock; care must be taken to avoid corrupting the data. To enable the
output mode of the ADS8517, CS (pin 23) must be low and R/C (pin 22) must be high. DATACLK must be high
for 20% to 70% of the total data clock period; the clock rate can be between dc and 10 MHz. Serial data from
conversion N can be output on SDATA (pin 19) after conversion N completes or during conversion N+1.
An obvious way to simplify control of the converter is to tie CS low and use R/C to initiate conversions.
While this configuration is perfectly acceptable, there is a possible problem when using an external data clock. At
an indeterminate point from 12
s after the start of conversion N until BUSY rises, the internal logic shifts the
results of conversion N into the output register. If CS is low, R/C high, and the external clock is high at this point,
data are lost. Consequently, with CS low, either R/C and/or DATACLK must be low during this period to avoid
losing valid data.
External Data Clock (After a Conversion)
After conversion N is completed and the output registers have been updated, BUSY (pin 24) goes high. With CS
low and R/C high, valid data from conversion N are output on SDATA (pin 19) synchronized to the external data
clock input on DATACLK (pin 18). The MSB is valid on the first falling edge and the second rising edge of the
external data clock. The LSB is valid on the 16th falling edge and 17th rising edge of the data clock. TAG (pin
20) inputs a bit of data for every external clock pulse. The first bit input on TAG is valid on SDATA on the 17th
falling edge and the 18th rising edge of DATACLK; the second input bit is valid on the 18th falling edge and the
19th rising edge, etc. With a continuous data clock, TAG data is output on SDATA until the internal output
registers are updated with the results from the next conversion. Refer to Table 6 and Figure 35 for more
information.
External Data Clock (During a Conversion)
After conversion N has been initiated, valid data from conversion N–1 can be read and are valid up to 2.2
s
after the start of conversion N. Do not attempt to clock out data from 2.2
s after the start of conversion N until
BUSY (pin 24) rises; doing so results in data loss.
NOTE:
For the best possible performance when using an external data clock, data should not
be clocked out during a conversion.
The switching noise of the asynchronous data clock can cause digital feedthrough, degrading converter
performance. Refer to Table 6 and Figure 36 for more information.
18
Copyright 2008–2009, Texas Instruments Incorporated
Product Folder Link(s): ADS8517
相關(guān)PDF資料
PDF描述
ADS8517IDW 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PDSO28
ADS8517IPWR 1-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL/PARALLEL ACCESS, PDSO28
ADS8519IRHBR 3-CH 16-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PQCC32
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ADS8517IDWRG4 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 16B,5V,125KSPS,ADC 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
ADS8517IPW 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Lo Pwr 16B 200kSPS +/-10V Bip InSAR ADC 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
ADS8517IPWR 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Lo Pwr 16B 200kSPS +/-10V Bip InSAR ADC 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
ADS8517W 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-Bit, 200-kSPS, Low-Power, Sampling ANALOG-TO-DIGITAL CONVERTER with Internal Reference and Parallel/Serial Interface
ADS8519 制造商:TI 制造商全稱:Texas Instruments 功能描述:16-BIT 250-KSPS SERIAL CMOS SAMPLING ANALOG-TO-DIGITAL CONVERTER
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