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| 型號： | EVAL-ADUC841QSZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 35/88頁 |
| 文件大小： | 0K |
| 描述： | KIT DEV FOR ADUC841 QUICK START |
| 產(chǎn)品培訓模塊： | Process Control |
| 標準包裝： | 1 |
| 系列： | QuickStart™ 套件 |
| 類型： | MCU |
| 適用于相關產(chǎn)品： | ADuC841 |
| 所含物品： | 評估板、電源、纜線、軟件和說明文檔 |
| 產(chǎn)品目錄頁面： | 739 (CN2011-ZH PDF) |
| 相關產(chǎn)品： | ADUC841BCPZ62-3-ND - IC MCU 62K FLASH ADC/DAC 56LFCSP ADUC841BCPZ62-5-ND - IC MCU 62K FLASH ADC/DAC 56LFCSP ADUC841BCPZ8-3-ND - IC MCU 8KB FLASH ADC/DAC 56LFCSP ADUC841BCPZ8-5-ND - IC MCU 8KB FLASH ADC/DAC 56LFCSP ADUC841BSZ62-5-ND - IC ADC/DAC 12BIT W/MCU 52-MQFP ADUC841BSZ62-3-ND - IC ADC/DAC 12BIT W/MCU 52-MQFP |
| 其它名稱： | EVAL-ADUC841QS EVAL-ADUC841QS-ND |
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ADuC841/ADuC842/ADuC843
Rev. 0 | Page 40 of 88
The endpoint nonlinearities illustrated in Figure 43 become
worse as a function of output loading. Most of the part’s
specifications assume a 10 k resistive load to ground at the
DAC output. As the output is forced to source or sink more
current, the nonlinear regions at the top or bottom (respectively)
of Figure 43 become larger. Larger current demands can sig-
nificantly limit output voltage swing. Figure 44 and Figure 45
illustrate this behavior. Note that the upper trace in each of
these figures is valid only for an output range selection of
0 V-to-AVDD. In 0 V-to-VREF mode, DAC loading does not cause
high-side voltage drops as long as the reference voltage remains
below the upper trace in the corresponding figure. For example,
if AVDD = 3 V and VREF = 2.5 V, the high-side voltage is not be
affected by loads less than 5 mA. But somewhere around 7 mA,
the upper curve in Figure 45 drops below 2.5 V (VREF), indicating
that at these higher currents the output is not capable of
reaching VREF.
To reduce the effects of the saturation of the output amplifier at
values close to ground and to give reduced offset and gain errors,
the internal buffer can be bypassed. This is done by setting the
DBUF bit in the CFG841/CFG842 register. This allows a full
rail-to-rail output from the DAC, which should then be buffered
externally using a dual-supply op amp in order to get a rail-to-
rail output. This external buffer should be located as close as
physically possible to the DAC output pin on the PCB. Note that
the unbuffered mode works only in the 0 V to VREF range.
To drive significant loads with the DAC outputs, external
buffering may be required (even with the internal buffer
enabled), as illustrated in Figure 46. Table 11 lists some
recommended op amps.
ADuC841/
ADuC842
DAC0
DAC1
03260-0-045
Figure 46. Buffering the DAC Outputs
The DAC output buffer also features a high impedance disable
function. In the chip’s default power-on state, both DACs are
disabled, and their outputs are in a high impedance state (or
three-state) where they remain inactive until enabled in
software. This means that if a zero output is desired during
power-up or power-down transient conditions, then a pull-
down resistor must be added to each DAC output. Assuming
this resistor is in place, the DAC outputs remain at ground
potential whenever the DAC is disabled.
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| EVAL-ADUC842QS | 功能描述:KIT DEV FOR ADUC842 QUICK START RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ 套件 產(chǎn)品培訓模塊:Blackfin® Processor Core Architecture Overview Blackfin® Device Drivers Blackfin® Optimizations for Performance and Power Consumption Blackfin® System Services 特色產(chǎn)品:Blackfin? BF50x Series Processors 標準包裝:1 系列:Blackfin® 類型:DSP 適用于相關產(chǎn)品:ADSP-BF548 所含物品:板，軟件，4x4 鍵盤，光學撥輪，QVGA 觸摸屏 LCD 和 40G 硬盤 配用:ADZS-BFBLUET-EZEXT-ND - EZ-EXTENDER DAUGHTERBOARDADZS-BFLLCD-EZEXT-ND - BOARD EXT LANDSCAP LCD INTERFACE 相關產(chǎn)品:ADSP-BF542BBCZ-4A-ND - IC DSP 16BIT 400MHZ 400CSBGAADSP-BF544MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF542KBCZ-6A-ND - IC DSP 16BIT 600MHZ 400CSBGAADSP-BF547MBBCZ-5M-ND - IC DSP 16BIT 533MHZ MDDR 400CBGAADSP-BF548BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF547BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF544BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGAADSP-BF542BBCZ-5A-ND - IC DSP 16BIT 533MHZ 400CSBGA |
| EVAL-ADUC842QS1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| EVAL-ADUC842QSP1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| EVAL-ADUC842QSP2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| EVAL-ADUC842QSPZ | 功能描述:KIT DEV QUICK START ADUC842 RoHS:是 類別:編程器，開發(fā)系統(tǒng) >> 通用嵌入式開發(fā)板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ PLUS 套件 標準包裝:1 系列:PICDEM™ 類型:MCU 適用于相關產(chǎn)品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，線纜，元件，CD，PICkit 編程器 產(chǎn)品目錄頁面:659 (CN2011-ZH PDF) |
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