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參數(shù)資料
| 型號： | SC1200 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Precision Analog-to-Digital Converter (ADC) and Digital-to-Analog Converter (DAC) with 8051 Microcontroller and Flash Memory |
| 中文描述： | 精密模擬到數(shù)字轉(zhuǎn)換器（ADC）和數(shù)字到模擬轉(zhuǎn)換器（DAC）的8051微控制器和閃存 |
| 文件頁數(shù)： | 17/60頁 |
| 文件大小： | 802K |
| 代理商： | SC1200 |
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MSC1200
SBAS289E
17
www.ti.com
FIGURE 6. Input Multiplexer Configuration.
FIGURE 7. Analog Input Structure (without buffer).
INPUT MULTIPLEXER
The input multiplexer provides for any combination of differential
inputs to be selected as the input channel, as shown in Figure 6.
If AIN0 is selected as the positive differential input channel, any
other channel can be selected as the negative differential input
channel. With this method, it is possible to have up to eight fully
differential input channels. It is also possible to switch the polarity
of the differential input pair to negate any offset voltages.
In addition, current sources are supplied that will source or
sink current to detect open or short circuits on the pins.
TEMPERATURE SENSOR
On-chip diodes provide temperature sensing capability. When
the configuration register for the input MUX is set to all 1s,
the diodes are connected to the input of the ADC. All other
channels are open.
BURNOUT DETECT
When the Burnout Detect (BOD) bit is set in the ADC control
configuration register (ADCON0 DC
H
), two current sources are
enabled. The current source on the positive input channel sources
approximately 2
μ
A of current. The current source on the negative
input channel sinks approximately 2
μ
A. This allows for the
detection of an open circuit (full-scale reading) or short circuit
(small differential reading) on the selected input differential pair.
Enabling the buffer is recommended when BOD is enabled.
INPUT BUFFER
The analog input impedance is always high, regardless of
PGA setting (when the buffer is enabled). With the buffer
enabled, the input voltage range is reduced and the analog
power-supply current is higher. If the limitation of input
voltage range is acceptable, then the buffer is always pre-
ferred.
The input impedance of the MSC1200 without the buffer
is 7M
/PGA. The buffer is controlled by the state of the BUF
bit in the ADC control register (ADCON0 DC
H
).
ANALOG INPUT
When the buffer is not selected, the input impedance of the
analog input changes with ACLK clock frequency (ACLK
F6
H
) and gain (PGA). The relationship is:
A
pedance
MHz
ACLK Frequency
M
PGA
IN
Im
( )
1
7
where ACLK frequency (f
ACLK
) =
f
ACLK
64
f
ACLK
CLK
+
1
and f
MOD
=
.
Figure 7 shows the basic input structure of the MSC1200.
R
SWITCH
(3k
Sampling Frequency = f
SAMP
High Impedance
> 1G
C
S
AGND
A
IN
PGA
f
SAMP
f
MOD
2
×
f
MOD
4
×
f
MOD
8
×
f
MOD
16
×
f
MOD
1, 2, 4
8
16
32
64, 128
PGA
C
S
9pF
18pF
36pF
1
2
4 to 128
AIN3
AIN4
AIN5
AIN6
AIN0
AIN1
AIN2
AIN7
AINCOM
Burnout Detect (2
μ
A)
Burnout Detect (2
μ
A)
Temperature Sensor
AV
DD
AGND
Buffer
I
80
I
AV
DD
AV
DD
In+
In
–
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