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參數(shù)資料
| 型號： | ADUC832BCP |
| 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 62 kBytes Flash MCU |
| 中文描述： | 8-BIT, FLASH, 16.78 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | MO-112AC-1, MQFP-52 |
| 文件頁數(shù)： | 33/80頁 |
| 文件大?。?/td> | 1311K |
| 代理商： | ADUC832BCP |
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REV. 0
ADuC832
–33–
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 21. 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.
OUTPUT
BUFFER
HIGH Z
DISABLE
(FROM MCU)
DAC0
R
R
R
R
R
ADuC832
AV
DD
V
REF
Figure 21. Resistor String DAC Functional Equivalent
As illustrated in Figure 21, the reference source for each DAC
is user selectable in software. It can be either AV
DD
or V
REF.
In
0-to-AV
DD
mode, the DAC output transfer function spans from
0 V to the voltage at the AV
DD
pin. In 0-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 V
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 AV
DD
and ground. Moreover, the DAC
’
s linearity specification (when
driving a 10 k
resistive load to ground) is guaranteed through
the full transfer function
except
codes 0 to 100, and, in 0-to-AV
DD
mode only, codes 3995 to 4095. Linearity degradation 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 22. The dotted line in Figure 22
indicates the
ideal
transfer function, and the solid line represents
what the transfer function might look like with endpoint nonlinear-
ities due to saturation of the output amplifier. Note that Figure 22
represents a transfer function in 0-to-V
DD
mode only. In 0-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
Figure 22. Endpoint Nonlinearities Due to Amplifier
Saturation
The endpoint nonlinearities conceptually illustrated in Figure 22
get worse as a function of output loading. Most of the ADuC832
’
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 22 become larger. With larger current demands, this
can significantly limit output voltage swing. Figures 23 and 24
illustrate this behavior. It should be noted that the upper trace in
each of these figures is only valid for an output range selection
of 0-to-AV
DD
. In 0-to-V
REF
mode, DAC loading will not cause
highside 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 will not be
affected by loads less than 5 mA. But somewhere around 7 mA,
the upper curve in Figure 24 drops below 2.5 V (V
REF
), indicating
that at these higher currents the output will not be capable of
reaching V
REF
.
SOURCE/SINK CURRENT – mA
5
0
5
10
15
O
4
3
2
1
0
DAC LOADED WITH 0000H
DAC LOADED WITH 0FFFH
Figure 23. Source and Sink Current Capability with
V
REF
= V
DD
= 5 V
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADUC832BCP-REEL | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3V/5V 56-Pin LFCSP EP T/R |
| ADUC832BCPZ | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP RoHS:是 類別: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/復(fù)位，POR，WDT 輸入/輸出數(shù):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(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 其它名稱:568-9587 |
| ADUC832BCPZ-REEL | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP RoHS:是 類別:集成電路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 標(biāo)準(zhǔn)包裝:38 系列:Encore!® XP® 核心處理器:eZ8 芯體尺寸:8-位 速度:5MHz 連通性:IrDA，UART/USART 外圍設(shè)備:欠壓檢測/復(fù)位，LED，POR，PWM，WDT 輸入/輸出數(shù):16 程序存儲器容量:4KB（4K x 8） 程序存儲器類型:閃存 EEPROM 大小:- RAM 容量:1K x 8 電壓 - 電源 (Vcc/Vdd):2.7 V ~ 3.6 V 數(shù)據(jù)轉(zhuǎn)換器:- 振蕩器型:內(nèi)部 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SOIC（0.295"，7.50mm 寬） 包裝:管件 其它名稱:269-4116Z8F0413SH005EG-ND |
| ADUC832BS | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3.3V/5V 52-Pin MQFP 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 16.78MHZ 3.3/5V 52MQFP - Bulk 制造商:Analog Devices 功能描述:8BIT MCU +12BIT ADC LQFP52 832 |
| ADUC832BS-REEL | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3.3V/5V 52-Pin MQFP T/R |
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