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參數(shù)資料
| 型號： | ADUC841 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| 中文描述： | MicroConverter的12位ADC和嵌入式高速DAC的62 - kB的閃存微控制器 |
| 文件頁數(shù)： | 23/88頁 |
| 文件大小： | 903K |
| 代理商： | ADUC841 |
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ADuC841/ADuC842/ADuC843
ADC CIRCUIT INFORMATION
General Overview
The ADC conversion block incorporates a fast, 8-channel,
12-bit, single-supply ADC. This block provides the user with
multichannel mux, track-and-hold, on-chip reference, calibra-
tion features, and ADC. All components in this block are easily
configured via a 3-register SFR interface.
Rev. 0 | Page 23 of 88
The ADC converter consists of a conventional successive
approximation converter based around a capacitor DAC. The
converter accepts an analog input range of 0 V to V
REF
. A high
precision, 15 ppm, low drift, factory calibrated 2.5 V reference is
provided on-chip. An external reference can be connected as
described in the Voltage Reference Connections section. This
external reference can be in the range 1 V to AV
DD
.
Single-step or continuous conversion modes can be initiated in
software or alternatively by applying a convert signal to an
external pin. Timer 2 can also be configured to generate a
repetitive trigger for ADC conversions. The ADC may be
configured to operate in a DMA mode whereby the ADC block
continuously converts and captures samples to an external
RAM space without any interaction from the MCU core. This
automatic capture facility can extend through a 16 MByte
external data memory space.
The ADuC841/ADuC842/ADuC843 are shipped with factory
programmed calibration coefficients that are automatically
downloaded to the ADC on power-up, ensuring optimum ADC
performance. The ADC core contains internal offset and gain
calibration registers that can be hardware calibrated to
minimize system errors.
A voltage output from an on-chip band gap reference propor-
tional to absolute temperature can also be routed through the
front end ADC multiplexer (effectively a 9th ADC channel
input), facilitating a temperature sensor implementation.
ADC Transfer Function
The analog input range for the ADC is 0 V to V
REF
. For this
range, the designed code transitions occur midway between
successive integer LSB values, i.e., 0.5 LSB, 1.5 LSB, 2.5 LSB . . .
FS –1.5 LSB. The output coding is straight binary with 1 LSB =
FS/4096 or 2.5 V/4096 = 0.61 mV when V
REF
= 2.5 V. The ideal
input/output transfer characteristic for the 0 V to V
REF
range is
shown in Figure 28.
CODE
111...111
111...110
111...101
111...100
000...011
000...010
000...001
000...000
0V 1LSB
+FS
1LSB =4096
0
Figure 28. ADC Transfer Function
Typical Operation
Once configured via the ADCCON 1–3 SFRs, the ADC converts
the analog input and provides an ADC 12-bit result word in the
ADCDATAH/L SFRs. The top 4 bits of the ADCDATAH SFR
are written with the channel selection bits to identify the channel
result. The format of the ADC 12-bit result word is shown in
Figure 29.
CH–ID
TOP 4 BITS
HIGH 4 BITS OF
ADC RESULT WORD
LOW 8 BITS OF THE
ADCDATAH SFR
ADCDATAL SFR
0
Figure 29. ADC Result Word Format
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ADUC841BCP62-3 | MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| ADUC841BCP62-5 | Cable Gland (Clamp); Connector Shell Size:10SL, 12S; Thread Size:5/8-24; Approval Categories:MIL-C-5015; Series:97 RoHS Compliant: Yes |
| ADUC841BCP8-3 | 10-823955-004 |
| ADUC841BCP8-5 | Cable Gland (Clamp); Connector Shell Size:14, 14S; Thread Size:3/4-20; Body Material:Zinc Alloy |
| ADUC841BS62-3 | MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADUC841BCP32-5 | 制造商:Analog Devices 功能描述:MICROCONVERTER 1-CYCLE VERSION ADUC829 - Trays |
| ADUC841BCP62-3 | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 3V 56-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 20MHZ 3.3V 56LFCSP - Bulk |
| ADUC841BCP62-5 | 制造商:Analog Devices 功能描述:MCU 8-Bit ADuC8xx 8052 CISC 62KB Flash 5V 56-Pin LFCSP EP |
| ADUC841BCP8-3 | 制造商:Analog Devices 功能描述:MCU 8-bit ADuC8xx 8052 CISC 62KB Flash 3V 56-Pin LFCSP EP 制造商:Rochester Electronics LLC 功能描述:8BIT CISC 62KB FLASH 20MHZ 3.3V 56LFCSP - Bulk |
| ADUC841BCP8-5 | 制造商:AD 制造商全稱:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
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