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參數資料
| 型號： | ADUC843BS62-3 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| 中文描述： | 8-BIT, FLASH, 8.38 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | PLASTIC, MO-112AC1, MQFP-52 |
| 文件頁數： | 40/88頁 |
| 文件大小： | 903K |
| 代理商： | ADUC843BS62-3 |
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ADuC841/ADuC842/ADuC843
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-AV
DD
. In 0 V-to-V
REF
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 AV
DD
= 3 V and V
REF
= 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 (V
REF
), indicating
that at these higher currents the output is not capable of
reaching V
REF
.
Rev. 0 | Page 40 of 88
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 V
REF
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
0
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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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADUC843BS62-5 | 制造商:Analog Devices 功能描述:IC MICROCONTROLLER |
| ADUC843BSZ62-3 | 功能描述:IC ADC 12BIT W/FLASH MCU 52-MQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標準包裝:250 系列:LPC11Uxx 核心處理器:ARM? Cortex?-M0 芯體尺寸:32-位 速度:50MHz 連通性:I²C，Microwire，SPI，SSI，SSP，UART/USART，USB 外圍設備:欠壓檢測/復位，POR，WDT 輸入/輸出數:40 程序存儲器容量:96KB（96K x 8） 程序存儲器類型:閃存 EEPROM 大小:4K x 8 RAM 容量:10K x 8 電壓 - 電源 (Vcc/Vdd):1.8 V ~ 3.6 V 數據轉換器:A/D 8x10b 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-LQFP 包裝:托盤 其它名稱:568-9587 |
| ADUC843BSZ62-5 | 功能描述:IC ADC 12BIT W/FLASH MCU 52-MQFP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標準包裝:60 系列:PSOC® 3 CY8C38xx 核心處理器:8051 芯體尺寸:8-位 速度:67MHz 連通性:EBI/EMI，I²C，LIN，SPI，UART/USART 外圍設備:電容感應，DMA，LCD，POR，PWM，WDT 輸入/輸出數:25 程序存儲器容量:64KB（64K x 8） 程序存儲器類型:閃存 EEPROM 大小:2K x 8 RAM 容量:8K x 8 電壓 - 電源 (Vcc/Vdd):1.71 V ~ 5.5 V 數據轉換器:A/D 2x20b，D/A 4x8b 振蕩器型:內部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-VFQFN 裸露焊盤 包裝:托盤 |
| ADUC844 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter, Dual 16-Bit/24-Bit ADCs with Embedded 62kB FLASH MCU |
| ADUC844BCP32-3 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter, Dual 16-Bit/24-Bit ADCs with Embedded 62kB FLASH MCU |
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