參數(shù)資料
型號(hào)： ADUC831BS
廠商： ANALOG DEVICES INC
元件分類： 微控制器/微處理器
英文描述： MicroConverter, 12-Bit ADCs and DACs with Embedded 62 kBytes Flash MCU
中文描述： 8-BIT, FLASH, 16.78 MHz, MICROCONTROLLER, PQFP52
封裝： PLASTIC, MQFP-52
文件頁(yè)數(shù)： 23/76頁(yè)
文件大?。?/td> 1211K
代理商： ADUC831BS
REV. 0
ADuC831
–23–
Keep in mind that the ADC’s transfer function is 0 to V
REF
, 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 V
REF
pin to
ground with a 0.1
μ
F capacitor and the C
REF
pin to ground with
a 0.1
μ
F capacitor as shown in Figure 11.
BUFFER
BUFFER
0.1 F
0.1 F
51
V
REF
C
REF
2.5V
BAND GAP
REFERENCE
ADuC831
Figure 11. Decoupling V
REF
and C
REF
If the internal voltage reference is to be used as a reference for
external circuitry, the C
REF
output should be used. However, a
buffer must be used in this case to ensure that no current is
drawn from the C
REF
pin itself. The voltage on the C
REF
pin is
that of an internal node within the buffer block, and its voltage
is critical to ADC and DAC accuracy. On the ADuC812 V
REF
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 V
REF
pin, but as noted
before there will be a gain error between this and that of the
ADC. The C
REF
output becomes available when the ADC is
powered up.
If an external voltage reference is preferred, it should be
connected to the V
REF
and C
REF
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 V
REF
must be between 1 V and AV
DD
. 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 C
REF
and V
REF
pins directly to AV
DD
.
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
V
REF
C
REF
"1" =
"0" = INTERNAL
EXTERNAL
0.1 F
2.5V
BAND GAP
REFERENCE
ADuC831
ADCCON1.6
V
DD
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 V
REF
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
0.1 F
51
V
REF
C
REF
2.5V
BAND GAP
REFERENCE
ADuC831
EXTERNAL
VOLTAGE
REFERENCE
V
DD
Figure 13. Using an External Voltage Reference
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