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參數資料
| 型號： | ADUuC7027BSTZ62-RL |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Precision Analog Microcontroller 12-bit Analog I/O, ARM7TDMI MCU |
| 中文描述： | 精密模擬微控制器的12位模擬I / O，ARM7TDMI的微控制器 |
| 文件頁數： | 41/92頁 |
| 文件大?。?/td> | 850K |
| 代理商： | ADUUC7027BSTZ62-RL |
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ADuC7019/20/21/22/24/25/26/27
Rev. A | Page 41 of 92
0
CADAC
CADAC
CLOGIC
COMPARATOR
SW3
SW1
A
A
B
B
SW2
C
S
C
S
V
REF
AIN0
AIN11
MUX
CHANNEL+
CHANNEL–
Figure 43. ADC Conversion Phase
Pseudo Differential Mode
In pseudo differential mode, Channel is linked to the V
IN
pin
of the ADuC7019/7020/7021/7022/7024/7025/7026/7027. SW2
switches between A (Channel) and B (V
REF
). V
IN
pin must be
connected to ground or a low voltage. The input signal on V
IN+
can then vary from V
IN
to V
REF
+ V
IN
. Note that V
IN
must be
chosen so that V
REF
+ V
IN
do not exceed AV
DD
.
0
CADAC
CAPACITIVE
DAC
CLOGIC
COMPARATOR
SW3
SW1
A
A
B
B
SW2
C
S
C
S
V
REF
AIN0
AIN11
VIN–
MUX
CHANNEL+
CHANNEL–
Figure 44. ADC in Pseudo Differential Mode
Single-Ended Mode
In single-ended mode, SW2 is always connected internally to
ground. The V
IN
pin can be floating. The input signal range on
V
IN+
is 0 V to V
REF
.
0
CADAC
CAPACITIVE
DAC
CLOGIC
COMPARATOR
SW3
SW1
A
B
C
S
C
S
AIN0
AIN11
MUX
CHANNEL+
CHANNEL–
Figure 45. ADC in Single-Ended Mode
Analog Input Structure
Figure 46 shows the equivalent circuit of the analog input structure
of the ADC. The four diodes provide ESD protection for the analog
inputs. Care must be taken to ensure that the analog input
signals never exceed the supply rails by more than 300 mV; this
would cause these diodes to become forward biased and start
conducting into the substrate. These diodes can conduct up to
10 mA without causing irreversible damage to the part.
The capacitors, C1, in Figure 46 are typically 4 pF and can be
primarily attributed to pin capacitance. The resistors are
lumped components made up of the ON resistance of the
switches. The value of these resistors is typically about 100 Ω.
The capacitors, C2, are the ADC’s sampling capacitors and
typically have a capacitance of 16 pF.
AV
DD
C1
D
D
R1C2
AV
DD
C1
D
D
R1C2
0
Figure 46. Equivalent Analog Input Circuit Conversion Phase:
Switches Open; Track Phase: Switches Closed
For ac applications, removing high frequency components
from the analog input signal is recommended by using an RC
low-pass filter on the relevant analog input pins. In applications
where harmonic distortion and signal-to-noise ratio are critical,
the analog input should be driven from a low impedance
source. Large source impedances significantly affect the ac
performance of the ADC. This can necessitate the use of an
input buffer amplifier. The choice of the op amp is a function of
the particular application. Figure 47 and Figure 48 give an
example of ADC front end.
0
ADuC702x
ADC0
10
Ω
0.01
μ
F
Figure 47. Buffering Single-Ended/Pseudo Differential Input
0
ADuC702x
ADC0
V
REF
ADC1
Figure 48. Buffering Differential Inputs
When no amplifier is used to drive the analog input, the source
impedance should be limited to values lower than 1 kΩ. The
maximum source impedance depends on the amount of total
harmonic distortion (THD) that can be tolerated. The THD
increases as the source impedance increases and the
performance degrades.
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