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参数资料
| 型号： | TC500IOE713 |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO16 |
| 封装： | 0.300 INCH, PLASTIC, MS-013, SOIC-16 |
| 文件页数： | 7/34页 |
| 文件大小： | 634K |
| 代理商： | TC500IOE713 |
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2006 Microchip Technology Inc.
DS21428D-page 15
TC500/A/510/514
9.0
DESIGN EXAMPLES
EQUATION 9-1:
Given:
Required Resolution: 16 bits (65,536
counts).
Maximum VIN: ±2V
Power Supply Voltage: +5V
60 Hz System
Step 1.
Pick integration time (tINT) as a multiple
of the line frequency:
1/60 Hz = 16.6 msec. Use 4x line
frequency.
= 66 msec
Step 2.
Calculate RINT:
RINT = VIN(MAX) /20 μA 2 /20 μA
= 100 k
Ω
Step 3.
Calculate CINT for maximum (4V)
integrator output swing.
CINT = (tINT) (20 x 10
–6) / (V
S - 0.9)
= (.066) (20 x 10 –6) / (4.1)
= 0.32
μF (use closest value: 0.33 μF)
Note:
Microchip recommended capacitor:
Evox Rifa p/n: 5MR5 334K50J03L4.
Step 4.
Choose CREF and CAZ based on
conversion rate.
Conversions/sec:
= 1/(TAZ + TINT + 2 TINT + 2 msec)
= 1/(66 msec +66 msec
+132 msec +2 msec)
= 3.7 conversions/sec
From which CAZ = CREF = 0.22 μF
(see Table 7-1)
Note:
Microchip recommended capacitor:
Evox Rifa p/n: 5MR5 224K50J02L4
Step 5.
Calculate VREF:
V
RE F
V
S
0.9
–
() C
INT
() R
INT
()
2T
INT
()
-----------------------------------------------------------
=
4.1
() 0.33 1
6
–
×
() 10
5
()
=
20.66
()
--------------------------------------------------------------
1.025
=
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