參數(shù)資料
型號： 20-101-0554
廠商： Rabbit Semiconductor
文件頁數(shù)： 26/94頁
文件大?。?/td> 0K
描述： COMPUTER SNGL BD BL2000 BOTT MNT
標(biāo)準(zhǔn)包裝： 1
系列： SBC
模塊/板類型： 單板計(jì)算機(jī)模塊
適用于相關(guān)產(chǎn)品： BL2000
28
Wildcat (BL2000)
3.6 D/A Converter Outputs
Figure 18 shows the analog voltage reference circuit.
Figure 18. Analog Reference Voltages
This circuit generates the 4.096 V reference voltage, which is used by the A/D converter
and optionally by the two D/A converters. This sets the operating range of the A/D con-
verter and the D/A converters (0–4.096 V). To use the full accuracy of the A/D converter
and the D/A converters, this voltage must be accurate to the same degree.
Under normal operation, the 453
resistor is not installed. The reference zener diode in
combination with the 100
resistor form a shunt regulator. The 4.096 V reference voltage
then feeds the A/D converter, the D/A converters, and the voltage divider composed of the
10 k
and the 14 k resistors. The voltage divider generates a second reference voltage of
1.707 V to feed the four op-amps for the buffered A/D converter inputs.
The reference voltage can be ratiometric rather than absolute. This is done by removing
the zener diode and installing the 453
resistor. With this arrangement, the reference
voltages follow changes in the power supply voltages Vcc and V+, which is a filtered ver-
sion of Vcc. This type of measurement circuit is preferred by some customers whose sen-
sors are powered from the Vcc supply and hence the outputs track Vcc.
A jumper on header JP3 allows the D/A converters to be powered either from the 4.096 V
reference (factory default) or from the analog supply +V. The D/A converters use their
power source also as the reference input, so normally powering the D/A converters from
the more accurate 4.096 V reference is best. However, should a customer desire more
dynamic range (0–5 V rather than 0–4.096 V), the jumper across JP3 can be set to power
the D/A converters from +V. When powered from the +V supply, the outputs of the D/A
converters will always be ratiometric, independent of whether the zener diode is installed.
10 kW
1.707_VREF
14 kW
100 nF
100 W
+V
453 W
4.096_VREF
1
3 2
JP3
DAC_PWR
+ V
4.096
V
ref
diode
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
20-101-0555 功能描述:單板計(jì)算機(jī) BL2000 Friction Lock RoHS:否 制造商:Ampro By ADLINK 外觀尺寸:EPIC 處理器類型:Intel Atom D510 頻率:1.66 GHz 存儲(chǔ)容量:2 GB (max) 存儲(chǔ)類型:DDR2, L2 Cache 接口類型:Ethernet, PS/2, SATA, Serial, USB 工作電源電壓:5 V, 12 V 功耗:13 W 最大工作溫度:+ 70 C 尺寸:165.1 mm x 114.3 mm
20-101-0556 功能描述:模塊化系統(tǒng) - SOM BL2000 W/IDCHEADERS RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in
20-101-0561 功能描述:模塊化系統(tǒng) - SOM RCM3400 Rabbit Core RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in
20-101-0562 功能描述:模塊化系統(tǒng) - SOM RCM3410 RABBITCORE RoHS:否 制造商:Digi International 外觀尺寸:ConnectCore 9P 處理器類型:ARM926EJ-S 頻率:150 MHz 存儲(chǔ)容量:8 MB, 16 MB 存儲(chǔ)類型:NOR Flash, SDRAM 接口類型:I2C, SPI, UART 工作電源電壓:3.3 V 最大工作溫度:+ 85 C 尺寸:1.97 in x 1.97 in x 6.1 in
20-101-0563 功能描述:模塊配件 RCM3400 PROTOTYPING BOARD RoHS:否 制造商:Lantronix 產(chǎn)品: 用于:
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