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參數(shù)資料
| 型號(hào)： | ADS7817B |
| 英文描述： | 12-Bit Differential Input Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER |
| 中文描述： | 12位差分輸入微功耗采樣模擬到數(shù)字轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 13/15頁(yè) |
| 文件大?。?/td> | 172K |
| 代理商： | ADS7817B |
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13
ADS7817
APPLICATION CIRCUITS
Figures 9, 10 and 11 show some typical applications circuits
for the ADS7817. Figure 9 shows a low cost, low power
circuit for basic data acquisition. Total power dissipation in
the ADS7817 and reference circuitry is under 5mW over
temperature, power supply variations, and at a 200kHz sample
rate.
Figure 10 is a motor control application using three ISO130s
to isolate the motor from the sensing system (three ADS7817s
and a DSP56004). The ISO130 provides 10kV/
μ
s (minimum)
isolation-mode rejection, 85kHz large signal bandwidth, and
a fixed gain of 8. The ADS7817’s reference voltage is 1.2V
and is derived from a REF1004-1.2. This gives the converter
a full-scale input range of
±
1.2V. Because of the gain of 8 in
the ISO130, the current sense resistor should give a worst-
case output voltage of less than
±
150mV.
Figure 11 is a similar application that isolates the digital
outputs of the three ADS7817s instead of the analog signal
from the motor. Here, the reference voltage for the ADS7817
is 150mV, and the analog input of each ADS7817 is con-
nected directly to the current sense resistor. By removing the
ISO130 from the signal path, a greater signal-to-noise ratio is
achieved in the sensing system. However, nine optical isola-
tors are needed to isolate the A/D converters.
FIGURE 9. Low Cost, Low Power Data Acquisition System.
ADS7817
V
CC
CS
D
OUT
DCLOCK
V
REF
+In
–In
GND
+
+
5
to 10
22
24.9k
REF1004-2.5
1μF to
10μF
1μF to
10μF
0.1μF
4.7μF
+
Microcontroller
+5V
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADS7817C | 12-Bit Differential Input Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS7818 | 2SC5161 |
| ADS7818E | 2SC5161 |
| ADS7818EB | 2SC5161 |
| ADS7818P | CMOS Dual 4-Input NOR Gate 14-PDIP -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADS7817C | 制造商:BB 制造商全稱(chēng):BB 功能描述:12-Bit Differential Input Micro Power Sampling ANALOG-TO-DIGITAL CONVERTER |
| ADS7817E | 制造商:TI 制造商全稱(chēng):Texas Instruments 功能描述:12-Bit Differential Input Micro Power Sampling |
| ADS7817E/250 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit Differential In MicroPwr 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 |
| ADS7817E/250G4 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit Differential In MicroPwr 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 |
| ADS7817E/2K5 | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-Bit Differential In MicroPwr 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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