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| 型號(hào)： | ADUC834 |
| 廠(chǎng)商： | Analog Devices, Inc. |
| 英文描述： | MicroConverter, Dual 16-/24- Bit ADCs with Embedded 62KB FLASH MCU |
| 中文描述： | MicroConverter的，雙與嵌入62KB閃存MCU 16-/24-位ADC |
| 文件頁(yè)數(shù)： | 35/72頁(yè) |
| 文件大?。?/td> | 1451K |
| 代理商： | ADUC834 |
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REV.
P
rC (12 March 2002)
ADuC834
–
35
–
PRELIMINARY TECHNICAL DATA
digital data that represents the analog input voltage is con-
tained in the duty cycle of the pulse train appearing at the
output of the comparator. T his duty cycle data can be recov-
ered as a data word using a subsequent digital filter stage.
T he sampling frequency of the modulator loop is many
times higher than the bandwidth of the input signal. T he
integrator in the modulator shapes the quantization noise
(which results from the analog-to-digital conversion) so that
the noise is pushed toward one-half of the modulator fre-
quency.
Digital F ilter
T he output of the sigma-delta modulator feeds directly into the
digital filter. T he digital filter then band-limits the response to
a frequency significantly lower than one-half of the modu-
lator frequency. In this manner, the 1-bit output of the
comparator is translated into a band-limited, low noise
output from the ADuC834 ADCs.
T he ADuC834 filter is a low-pass, Sinc
3
or (sinx/x)
3
filter
whose primary function is to remove the quantization noise
introduced at the modulator. T he cutoff frequency and deci-
mated output data rate of the filter are programmable via the
SF (Sinc Filter) SFR as described in T able VIII.
F igure 21 shows the frequency response of the AD C
channel at the default SF word of 69 dec or 45 hex, yielding
an overall output update rate of just under 20 Hz.
It should be noted that this frequency response allows fre-
quency components higher than the ADC Nyquist frequency
to pass through the ADC, in some cases without significant
attenuation. T hese components may, therefore, be aliased and
appear in-band after the sampling process.
It should also be noted that rejection of mains-related fre-
quency components, i.e., 50 Hz and 60 Hz, is seen to be at
level of >65 dB at 50 Hz and >100 dB at 60 Hz. T his con-
firms the data sheet specifications for 50 Hz/60 Hz Normal
Mode Rejection (NMR) at a 20 Hz update rate.
0
20
30
50
70
80
90
100
110
FREQUENCY
Hz
G
0
20
40
70
80
90
100
110
120
10
40
60
10
30
60
50
Figure 21. Filter Response, SF = 69 dec
T he response of the filter, however, will change with SF word
as can be seen in Figure 22, which shows >90 dB NMR at
50 Hz and >70 dB NMR at 60 Hz when SF = 255 dec.
0
20
30
50
70
80
90
110
FREQUENCY
Hz
G
0
20
40
70
80
90
100
110
120
10
40
60
10
30
60
50
Figure 22. Filter Response, SF = 255 dec
Figures 23 and 24 show the NMR for 50 Hz and 60 Hz across
the full range of SF word, i.e., SF = 13 dec to SF = 255 dec.
10
50
70
110
150
170 190
210
SF
Decimal
G
0
20
40
70
80
90
100
110
120
30
90
130
10
30
60
50
230
250
Figure 23. 50 Hz Normal Mode Rejection vs. SF
10
50
70
110
SF
Decimal
150
170
190
210
G
0
20
40
70
80
90
100
110
120
30
90
130
10
30
60
50
230
250
Figure 24. 60 Hz Normal Mode Rejection vs. SF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADUC834_02 | 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 62 kB Flash MCU |
| ADUC834BCP | 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 12.58MHZ 3.3/5V 56LFCSP - Bulk 制造商:Analog Devices 功能描述: |
| ADUC834BCPZ | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP 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 |
| ADUC834BCPZ-REEL | 功能描述:IC MCU 62K FLASH ADC/DAC 56LFCSP 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: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(cè)/復(fù)位，LED，POR，PWM，WDT 輸入/輸出數(shù):16 程序存儲(chǔ)器容量:4KB（4K x 8） 程序存儲(chǔ)器類(lèi)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(chēng):269-4116Z8F0413SH005EG-ND |
| ADUC834BS | 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 12.58MHZ 3.3/5V 52MQFP - Bulk 制造商:Analog Devices 功能描述:8BIT MCU +24/16BIT ADC SMD MQFP52 |
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