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參數(shù)資料
| 型號： | ADUC831BSZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 16/76頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC MCU 62K FLASH ADC/DAC 52MQFP |
| 標(biāo)準(zhǔn)包裝： | 800 |
| 系列： | MicroConverter® ADuC8xx |
| 核心處理器： | 8052 |
| 芯體尺寸： | 8-位 |
| 速度： | 16MHz |
| 連通性： | EBI/EMI，I²C，SPI，UART/USART |
| 外圍設(shè)備： | PSM，溫度傳感器，WDT |
| 輸入/輸出數(shù)： | 34 |
| 程序存儲器容量： | 62KB（62K x 8） |
| 程序存儲器類型： | 閃存 |
| EEPROM 大?。?/td> | 4K x 8 |
| RAM 容量： | 2.25K x 8 |
| 電壓 - 電源 (Vcc/Vdd)： | 2.7 V ~ 5.5 V |
| 數(shù)據(jù)轉(zhuǎn)換器： | A/D 8x12b，D/A 2x12b |
| 振蕩器型： | 內(nèi)部 |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 52-QFP |
| 包裝： | 帶卷 (TR) |
| 配用： | EVAL-ADUC831QSZ-ND - KIT DEV FOR ADUC831 QUICK START |
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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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