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| 型号： | ADUC845BCPZ8-3 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, FLASH, 12.58 MHz, MICROCONTROLLER, QCC56 |
| 封装： | 8 X 8 MM, LEAD FREE, MO-220-VLLD-2, LFCSP-56 |
| 文件页数： | 29/108页 |
| 文件大小： | 1940K |
| 代理商： | ADUC845BCPZ8-3 |
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ADuC845/ADuC847/ADuC848
Rev. B | Page 27 of 108
Signal Chain Overview (Chop Enabled, CHOP = 0)
With the CHOP bit = 0 (see the ADCMODE SFR bit designa-
tions in Table 24), the chopping scheme is enabled. This is the
default condition and gives optimum performance in terms of
offset errors and drift performance. With chop enabled, the
available output rates vary from 5.35 Hz to 105 Hz (SF = 255
and 13, respectively). A typical block diagram of the ADC input
channel with chop enabled is shown in Figure 12.
The sampling frequency of the modulator loop is many times
higher than the bandwidth of the input signal. The integrator in
the modulator shapes the quantization n
from the analog-to-digital conversion) so that the noise is pushe
toward one-half of the modulator frequency. The output of the
Σ-Δ modulator feeds directly into the digital filter. The digital
filter then band-limits the response to a frequency significantly
lower than one-half of the modulator frequency. In this manner,
the 1-bit output of the comparator is translated into a band
limited, low noise output from the ADCs.
The ADC filter is a low-pass Sinc3 or (sinx/x)3 filter whose
primary function is to remove the quantization noise introduced
at the modulator. The cutoff frequency and decimated output
data rate of the filter are programmable via the Sinc filter word
loaded into the filter (SF) register (see Table 28). The complete
signal chain is chopped, resulting in excellent dc offset and
offset drift specifications and is extremely beneficial in applica-
tions where drift, noise rejection, and optimum EMI rejection
are important.
With
deci
have
resu
word
filter
to th
factor is restricted to an 8-bit register called SF (see Table 28),
e actual decimation factor is the register value times 8.
Therefore, the decimated output rate from the Sinc3 filter (and
the ADC conversion rate) is
oise (which results
d
chop enabled, the ADC repeatedly reverses its inputs. The
mated digital output words from the Sinc3 filter, therefore,
a positive offset and a negative offset term included. As a
lt, a final summing stage is included so that each output
from the filter is summed and averaged with the previous
output to produce a new valid output result to be written
e ADC data register. Programming the Sinc3 decimation
th
MOD
ADC
f
SF
f
×
=
8
1
3
1
where:
fADC is the ADC conversion rate.
SF is the decimal equivalent of the word loaded to the filter
register.
fMOD is the modulator sampling rate of 32.768 kHz.
The chop rate of the channel is half the output data rate:
ADC
CHOP
f
×
=
2
1
outputs alternately contain +VOS and VOS, where VOS is the
respective channel offset.
SINC3 FILTER
PGA
3
× (8 × SF)
Σ-
MOD
FADC
DIGITAL
OUTPUT
ANALOG
INPUT
MUX
BUF
AIN + VOS
AIN – VOS
FMOD
XOR
2
FCHOP
FIN
04741-013
Σ-
t Channel with Chop Enabled
Figure 12. Block Diagram of the ADC Inpu
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相关代理商/技术参数 |
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|---|---|
| ADUC845BCPZ8-5 | 功能描述:IC MCU FLASH 24BIT ADC 56LFCSP RoHS:是 类别:集成电路 (IC) >> 嵌入式 - 微控制器， 系列:MicroConverter® ADuC8xx 标准包装:38 系列:Encore!® XP® 核心处理器:eZ8 芯体尺寸:8-位 速度:5MHz 连通性:IrDA，UART/USART 外围设备:欠压检测/复位，LED，POR，PWM，WDT 输入/输出数:16 程序存储器容量:4KB（4K x 8） 程序存储器类型:闪存 EEPROM 大小:- RAM 容量:1K x 8 电压 - 电源 (Vcc/Vdd):2.7 V ~ 3.6 V 数据转换器:- 振荡器型:内部 工作温度:-40°C ~ 105°C 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 包装:管件 其它名称:269-4116Z8F0413SH005EG-ND |
| ADUC845BS62-3 | 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 12.85MHZ 3.3V 52MQFP - Bulk |
| ADUC845BS62-5 | 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 12.85MHZ 5V 52MQFP - Bulk 制造商:Analog Devices 功能描述:IC MICROCONTROLLER |
| ADUC845BS8-3 | 制造商:Analog Devices 功能描述: |
| ADUC845BS8-5 | 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 12.85MHZ 5V 52MQFP - Bulk |
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