參數(shù)資料
型號(hào)： ADUC843BS62-5
廠(chǎng)商： ANALOG DEVICES INC
元件分類(lèi)： 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, 16.78 MHz, MICROCONTROLLER, PQFP52
封裝： PLASTIC, MO-112AC1, MQFP-52
文件頁(yè)數(shù)： 39/88頁(yè)
文件大小： 903K
代理商： ADUC843BS62-5
ADuC841/ADuC842/ADuC843
Using the DAC
The on-chip DAC architecture consists of a resistor string DAC
followed by an output buffer amplifier, the functional equivalent
of which is illustrated in Figure 42. Details of the actual DAC
architecture can be found in U.S. Patent Number 5969657
(www.uspto.gov). Features of this architecture include inherent
guaranteed monotonicity and excellent differential linearity.
Rev. 0 | Page 39 of 88
OUTPUT
BUFFER
HIGH Z
DISABLE
(FROM MCU)
DAC0
R
R
R
R
R
ADuC841/ADuC842
AV
DD
V
REF
0
Figure 42. Resistor String DAC Functional Equivalent
As shown in Figure 42, the reference source for each DAC is
user selectable in software. It can be either AV
DD
or V
REF
. In
0 V-to-AV
DD
mode, the DAC output transfer function spans
from 0 V to the voltage at the AV
DD
pin. In 0 V-to-V
REF
mode,
the DAC output transfer function spans from 0 V to the internal
V
REF
or, if an external reference is applied, the voltage at the C
REF
pin. The DAC output buffer amplifier features a true rail-to-rail
output stage implementation. This means that unloaded, each
output is capable of swinging to within less than 100 mV of
both AVDD and ground. Moreover, the DAC’s linearity specifica-
tion (when driving a 10 k resistive load to ground) is guaranteed
through the full transfer function except Codes 0 to 100, and, in
0 V-to-AVDD mode only, Codes 3995 to 4095. Linearity degrada-
tion near ground and V
DD
is caused by saturation of the output
amplifier, and a general representation of its effects (neglecting
offset and gain error) is illustrated in Figure 43. The dotted line
in Figure 43 indicates the ideal transfer function, and the solid
line represents what the transfer function might look like with
endpoint nonlinearities due to saturation of the output amplifier.
Note that Figure 43 represents a transfer function in 0 V-to-V
DD
mode only. In 0 V-to-V
REF
mode (with V
REF
< V
DD
), the lower
nonlinearity would be similar, but the upper portion of the
transfer function would follow the ideal line right to the end
(V
REF
in this case, not V
DD
), showing no signs of endpoint
linearity errors.
V
DD
V
DD
–50mV
V
DD
–100mV
100mV
50mV
0mV
000H
FFFH
0
Figure 43. Endpoint Nonlinearities Due to Amplifier Saturation
SOURCE/SINK CURRENT (mA)
5
0
5
10
15
O
4
3
2
1
0
DAC LOADED WITH 0000H
DAC LOADED WITH 0FFFH
0
Figure 44. Source and Sink Current Capability with V
REF
= V
DD
= 5 V
SOURCE/SINK CURRENT (mA)
4
0
5
10
15
O
3
1
0
DAC LOADED WITH 0000H
DAC LOADED WITH 0FFFH
0
Figure 45. Source and Sink Current Capability with V
REF
= V
DD
= 3 V
相關(guān)PDF資料
PDF描述
ADUC842 CON, RTANG 68 POS
ADUC842BCP 12- Bit ADCs and DACs with Embedded Hi-Speed 62KB FLASH MCU
ADUC842BS 12- Bit ADCs and DACs with Embedded Hi-Speed 62KB FLASH MCU
ADUC844BS62-5 MicroConverter, Dual 16-Bit/24-Bit ADCs with Embedded 62kB FLASH MCU
ADUC844BS62-3 MicroConverter, Dual 16-Bit/24-Bit ADCs with Embedded 62kB FLASH MCU
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADUC843BSZ62-3 功能描述:IC ADC 12BIT W/FLASH MCU 52-MQFP RoHS:是 類(lèi)別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標(biāo)準(zhǔn)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(shè)備:欠壓檢測(cè)/復(fù)位，POR，WDT 輸入/輸出數(shù):40 程序存儲(chǔ)器容量:96KB（96K x 8） 程序存儲(chǔ)器類(lèi)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(shù)據(jù)轉(zhuǎn)換器:A/D 8x10b 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 85°C 封裝/外殼:48-LQFP 包裝:托盤(pán) 其它名稱(chēng):568-9587
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ADUC844 制造商:AD 制造商全稱(chēng):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(chēng):Analog Devices 功能描述:MicroConverter, Dual 16-Bit/24-Bit ADCs with Embedded 62kB FLASH MCU
ADUC844BCP32-5 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:MicroConverter, Dual 16-Bit/24-Bit ADCs with Embedded 62kB FLASH MCU
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