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參數(shù)資料
| 型號(hào)： | ADS7813PB |
| 英文描述： | Low-Power, Serial 16-Bit Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 低功耗，串行16位采樣模擬到數(shù)字轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 17/17頁(yè) |
| 文件大?。?/td> | 376K |
| 代理商： | ADS7813PB |
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ADS7813
Figure 16 shows a QSPI-equipped microcontroller interfac-
ing to three ADS7813s. There are many possible variations
to this interface scheme. As shown, the QSPI port produces
a common CONV signal which initiates a conversion on all
three converters. After the conversions are finished, each
result is transferred in turn. The QSPI port is completely
programmable to handle the timing and transfers without
processor intervention. If the CONV signal is generated in
this way, it should be possible to make both AC and DC
measurements with the ADS7813, as the CONV signal will
have low jitter. Note that if the CONV signal is generated via
software commands, it will have a good deal of jitter and
only low frequency (DC) measurements can be made.
SPI INTERFACING
The serial peripheral interface (SPI) is directly related to the
QSPI and both Figures 15 and 16 can be used as a guide for
connecting the ADS7813 to SPI-equipped microcontrollers.
For most microcontrollers, the SPI port is capable of 8-bit
transfers only. In the case of Figure 15, be aware that the
microcontroller may have to be capable of fetching the 8
most significant bits before they are overwritten by the 8
least significant bits.
DSP56002 INTERFACING
The DSP56002 serial interface has an SPI compatibility
mode with some enhancements. Figure 17 shows an inter-
face between the ADS7813 and the DSP56002. As with the
QSPI interface of Figure 15, the DSP56002 must be pro-
grammed to enable the serial interface when a LOW to
HIGH transition on SCI occurs.
The DSP56002 can also provide the CONV signal, as shown
in Figure 18. The receive and transmit sections of the
interface are decoupled (asynchronous mode) and the trans-
mit section is set to generate a word length frame sync every
other transmit frame (frame rate divider set to 2). The
prescale modulus should be set to produce a transmit frame
at twice the desired conversion rate.
FIGURE 18. DSP56002 Interface to the ADS7813. Processor Initiates Conversions.
CONV
BUSY
DATACLK
DATA
CS
EXT/INT
ADS7813
DSP56002
SC2
SC0
SRD
SYN = 0 (Asychronous)
GCK = 1 (Gated clock)
SCD2 = 1 (SC2 is an output)
SHFD = 0 (Shift MSB first)
WL1 = 1 WL0 = 0 (Word length = 16 bits)
FIGURE 16. QSPI Interface to Three ADS7813s.
FIGURE 17. DSP56002 Interface to the ADS7813.
CONV
BUSY
DATA
DATACLK
CS
EXT/INT
ADS7813
SC1
SRD
SCO
DSP56002
SYN = 0 (Asychronous)
GCK = 1 (Gated clock)
SCD1 = 0 (SC1 is an input)
SHFD = 0 (Shift MSB first)
WL1 = 1 WL0 = 0 (Word length = 16 bits)
Convert Pulse
CONV
CS
DATACLK
DATA
EXT/INT
ADS7813
PCS0
PCS1
PCS2
PCS3
SCK
MIS0
QSPI
CONV
CS
DATACLK
DATA
EXT/INT
ADS7813
CONV
CS
DATACLK
DATA
EXT/INT
ADS7813
+5V
+5V
+5V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7813PB | 制造商:Texas Instruments 功能描述:A/D CONVERTER (A-D) IC |
| ADS7813PBG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power Serial 16-Bit Sampling 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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 |
| ADS7813PG4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power Serial 16-Bit Sampling 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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 |
| ADS7813U | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power Serial 16-Bit Sampling 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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 |
| ADS7813U/1K | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC Low-Power Serial 16-Bit Sampling 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(lèi)型:Differential 信噪比:107 dB 接口類(lèi)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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