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| 型号： | EVAL-ADUC831QSZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/76页 |
| 文件大小： | 0K |
| 描述： | KIT DEV FOR ADUC831 QUICK START |
| 产品培训模块： | Process Control |
| 标准包装： | 1 |
| 系列： | QuickStart™ 套件 |
| 类型： | MCU |
| 适用于相关产品： | ADuC831 |
| 所含物品： | 评估板、电源、缆线、软件和说明文档 |
| 产品目录页面： | 739 (CN2011-ZH PDF) |
| 相关产品： | ADUC831BCPZ-ND - IC MCU 62K FLASH ADC/DAC 56LFCSP ADUC831BCPZ-REEL-ND - IC MCU 62K FLASH ADC/DAC 56LFCSP ADUC831BSZ-REEL-ND - IC MCU 62K FLASH ADC/DAC 52MQFP ADUC831BSZ-ND - IC ADC/DAC 12BIT W/MCU 52-MQFP |
| 其它名称： | EVAL-ADUC831QS EVAL-ADUC831QS-ND |
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REV. 0
ADuC831
–23–
Keep in mind that the ADC’s transfer function is 0 to VREF, and
any signal range lost to amplifier saturation near ground will
impact dynamic range. Though the op amps in Table VI are
capable of delivering output signals very closely approaching
ground, no amplifier can deliver signals all the way to ground when
powered by a single supply. Therefore, if a negative supply is
available, you might consider using it to power the front end
amplifiers. If you do, however, be sure to include the Schottky
diodes shown in Figure 10 (or at least the lower of the two
diodes) to protect the analog input from undervoltage condi-
tions. To summarize this section, use the circuit of Figure 10 to
drive the analog input pins of the ADuC831.
Voltage Reference Connections
The on-chip 2.5 V band gap voltage reference can be used as the
reference source for the ADC and DACs. To ensure the accu-
racy of the voltage reference, you must decouple the VREF pin to
ground with a 0.1
F capacitor and the CREF pin to ground with
a 0.1
F capacitor as shown in Figure 11.
BUFFER
0.1 F
51
VREF
CREF
2.5V
BAND GAP
REFERENCE
ADuC831
Figure 11. Decoupling VREF and CREF
If the internal voltage reference is to be used as a reference for
external circuitry, the CREF output should be used. However, a
buffer must be used in this case to ensure that no current is
drawn from the CREF pin itself. The voltage on the CREF pin is
that of an internal node within the buffer block, and its voltage
is critical to ADC and DAC accuracy. On the ADuC812 VREF
was the recommended output for the external reference; this
can be used but it should be noted that there will be a gain error
between this reference and that of the ADC.
The ADuC831 powers up with its internal voltage reference in
the “on” state. This is available at the VREF pin, but as noted
before there will be a gain error between this and that of the
ADC. The CREF output becomes available when the ADC is
powered up.
If an external voltage reference is preferred, it should be
connected to the VREF and CREF pins as shown in Figure 12.
Bit 6 of the ADCCON1 SFR must be set to 1 to switch in the
external reference voltage.
To ensure accurate ADC operation, the voltage applied to VREF
must be between 1 V and AVDD. In situations where analog
input signals are proportional to the power supply (such as some
strain gage applications) it may be desirable to connect the CREF
and VREF pins directly to AVDD.
Operation of the ADC or DACs with a reference voltage below
1 V, however, may incur loss of accuracy eventually resulting in
missing codes or non-monotonicity. For that reason, do not use
a reference voltage less than 1 V.
BUFFER
0.1 F
51
VREF
CREF
"1" =
"0" = INTERNAL
EXTERNAL
0.1 F
2.5V
BAND GAP
REFERENCE
ADuC831
ADCCON1.6
VDD
EXTERNAL
VOLTAGE
REFERENCE
Figure 12. Using an External Voltage Reference
To maintain compatibility with the ADuC812, the external
reference can also be connected to the VREF pin as shown in
Figure 13, to overdrive the internal reference. Note this intro-
duces a gain error for the ADC that has to be calibrated out,
thus the previous method is the recommended one for most
users. For this method to work, ADCCON1.6 should be config-
ured to use the internal reference. The external reference will
then overdrive this.
BUFFER
0.1 F
51
VREF
CREF
2.5V
BAND GAP
REFERENCE
ADuC831
EXTERNAL
VOLTAGE
REFERENCE
VDD
Figure 13. Using an External Voltage Reference
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-ADUC832QS | 制造商:Analog Devices 功能描述:QUICK START DEVELOPMENT SYSTEM - Bulk 制造商:Analog Devices 功能描述:DEVELOPMENT KIT SYSTEM |
| EVAL-ADUC832QSZ | 功能描述:KIT DEV FOR ADUC832 QUICK START RoHS:是 类别:编程器，开发系统 >> 通用嵌入式开发板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ 套件 标准包装:1 系列:PICDEM™ 类型:MCU 适用于相关产品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，线缆，元件，CD，PICkit 编程器 产品目录页面:659 (CN2011-ZH PDF) |
| EVAL-ADUC834QS | 制造商:Analog Devices 功能描述:DATA ACQ SYS, MICROCNVRTR, DUAL 16BIT/24BIT - ADCS W/ EMBEDD - Bulk 制造商:Analog Devices 功能描述:8052 ADUC834 QUICKSTART DEV KIT |
| EVAL-ADUC834QSZ | 功能描述:KIT DEV QUICK START ADUC834 RoHS:是 类别:编程器，开发系统 >> 通用嵌入式开发板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ 套件 标准包装:1 系列:PICDEM™ 类型:MCU 适用于相关产品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，线缆，元件，CD，PICkit 编程器 产品目录页面:659 (CN2011-ZH PDF) |
| EVAL-ADUC836QS | 制造商:Analog Devices 功能描述:MCU 8BIT 8052 CISC 62KB+4KB FLASH 3.6V 48LQFP - Bulk 制造商:Analog Devices 功能描述:KIT- ADUC836 DEV SYSTEM |
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