参数资料
| 型号： | ADM1026EBZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 17/55页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADM1026 |
| 标准包装： | 1 |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADM1026 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADM1026EB EVAL-ADM1026EB-ND |
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ADM1026
A IN0 – A IN5
109.4k ?
4.6pF
R1 +
for A IN0 through A IN5 (eq. 2)
Voltage Measurement Inputs
The internal structure for all the analog inputs is shown in
Figure 26. Each input circuit consists of an input protection
diode, an attenuator, plus a capacitor to form a first-order
low-pass filter that gives each voltage measurement input
immunity to high frequency noise. The ? 12 V input also has
a resistor connected to the on-chip reference to offset the
negative voltage range so that it is always positive and can
be handled by the ADC. This allows most popular power
supply voltages to be monitored directly by the ADM1026
without requiring any additional resistor scaling.
21.9k ?
(0V – 3V)
However, when scaling A IN0 to A IN5 , it should be noted
that these inputs already have an on-chip attenuator, because
their primary function is to monitor SCSI termination
voltages. This attenuator loads any external attenuator. The
input resistance of the on-chip attenuator can be between
100 k W and 200 k W . For this tolerance not to affect the
accuracy, the output resistance of the external attenuator
should be very much lower than this, that is, 1 k W in order
to add not more than 1% to the total unadjusted error (TUE).
Alternatively, the input can be buffered using an op amp.
V f s * 3.0
R2 3.0
R1 +
for A IN6 through A IN9 (eq. 3)
A IN6 – A IN9
(0V – 2.5V)
52.5k ?
4.6pF
V f s * 2.5
R2 2.5
Negative and bipolar input ranges can be accommodated
by using a positive reference voltage to offset the input
+12V
113.5k ?
21k ?
V REF
9.3pF
voltage range so that it is always positive. To monitor a
negative input voltage, an attenuator can be used as shown
in Figure 28.
R2
–12V
114.3k ?
17.5k ?
MUX
V IN
R1
A IN(0–9)
9.3pF
+5V
83.5k ?
50k ?
4.6pF
Figure 28. Scaling and Offsetting A IN0 ? A IN9
for Negative Inputs
V BAT
49.5k ?
This offsets the negative voltage so that the ADC always
sees a positive voltage. R1 and R2 are chosen so that the
82.7k ?
* SEE TEXT
4.5pF
ADC input voltage is zero when the negative input voltage
is at its maximum (most negative) value, that is:
R1 +
+V CCP
21.9k
R2
V f s *
V OS
(eq. 4)
109.4k ?
18.5pF
This is a simple and low cost solution, but note the
following:
Figure 26. Voltage Measurement Inputs
Setting Other Input Ranges
A IN0 to A IN9 can easily be scaled to voltages other than
2.5 V or 3.0 V. If the input voltage range is zero to some
positive voltage, all that is required is an input attenuator, as
shown in Figure 27.
R1 A IN(0–9)
V IN
R2
Figure 27. Scaling A IN0 ? A IN9
? Because the input signal is offset but not inverted, the
input range is transposed. An increase in the magnitude
of the negative voltage (going more negative) causes the
input voltage to fall and give a lower output code from
the ADC. Conversely, a decrease in the magnitude of the
negative voltage causes the ADC code to increase. The
maximum negative voltage corresponds to zero output
from the ADC. This means that the upper and lower
limits are transposed.
? For the ADC output to be full scale when the negative
voltage is zero, V OS must be greater than the full ? scale
voltage of the ADC, because V OS is attenuated by R1 and
R2. If V OS is equal to or less than the full ? scale voltage
of the ADC, the input range is bipolar but not necessarily
symmetrical.
http://onsemi.com
17
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