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AFS090 датащи(PDF) 107 Page - Microsemi Corporation

номер детали AFS090
подробное описание детали  Fusion Family of Mixed Signal FPGAs
PDF  334 Pages
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производитель  MICROSEMI [Microsemi Corporation]
домашняя страница  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

AFS090 датащи(HTML) 107 Page - Microsemi Corporation

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Fusion Family of Mixed Signal FPGAs
R e visio n 2
2 - 91
Terminology
Accuracy
The accuracy of Fusion Current Monitor is ±2 mV minimum plus 5% of the differential voltage at the
input. The input accuracy can be translated to error at the ADC output by using EQ 4. The 10 V/V gain is
the gain of the Current Monitor Circuit, as described in the "Current Monitor" section on page 2-88. For 8-
bit mode, N = 8, V
AREF= 2.56 V, zero differential voltage between AV and AC, the Error (EADC) is equal to
2 LSBs.
EQ 4
where
N
is the number of bits
VAREF is the Reference voltage
VAV is the voltage at AV pad
VAC is the voltage at AC pad
Table 2-37 • Recommended Resistor for Different Current Range Measurement
Current Range
Recommended Minimum Resistor Value (Ohms)
> 5 mA – 10 mA
10 – 20
> 10 mA – 20 mA
5 – 10
> 20 mA – 50 mA
2.5 – 5
> 50 mA – 100 mA
1 – 2
> 100 mA – 200 mA
0.5 – 1
> 200 mA – 500 mA
0.3 – 0.5
> 500 mA – 1 A
0.1 – 0.2
> 1 A – 2 A
0.05 – 0.1
> 2 A – 4 A
0.025 – 0.05
> 4 A – 8 A
0.0125 – 0.025
> 8 A – 12 A
0.00625 – 0.02
Figure 2-71 • Negative Current Monitor
I
RSENSE
0 to
–10.5 V
AVx
ACx
CMSTBx
10 X
VADC
Current Monitor
to Analog MUX
(see Table 2-36
for MUXchannel
number)
E
ADC
2mV 0.05 V
AV
V
AC
–
+
()
10V
() V
⁄
×
2
N
V
AREF
-----------------
×
=



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