參數(shù)資料
型號: TC500COE
廠商: Microchip Technology
文件頁數(shù): 11/38頁
文件大?。?/td> 0K
描述: IC ANALOG FRONT END 16BIT 16SOIC
標(biāo)準(zhǔn)包裝: 47
位數(shù): 16
通道數(shù): 1
功率(瓦特): 10mW
電壓 - 電源,模擬: 5V
電壓 - 電源,數(shù)字: 4.5 V ~ 7.5 V
封裝/外殼: 16-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC
包裝: 管件
產(chǎn)品目錄頁面: 673 (CN2011-ZH PDF)
2008 Microchip Technology Inc.
DS21428E-page 19
TC500/A/510/514
9.0
DESIGN EXAMPLES
Refer to Figures 9-1 to 9-4.
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 ms. Use 4x line
frequency.
= 66 ms
Step 2.
Calculate RINT:
RINT = VIN(MAX) /20 μA 2 /20 μA
= 100 k
Step 3.
Calculate CINT for maximum (4V)
integrator output swing.
CINT = (tINT) (20 x 10 –6) / (VS - 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 ms)
= 1/(66 ms +66 ms +132 ms +2 ms)
= 3.7 conversions/sec
From which CAZ = CREF = 0.22 μF
Note:
Microchip recommended capacitor:
Evox Rifa p/n: 5MR5 224K50J02L4
Step 5.
Calculate VREF:
V
REF
V
S
0.9
() C
INT
() R
INT
()
2T
INT
()
-----------------------------------------------------------
=
4.1
() 0.33 10
6
×
() 100 10
3
×
()
2 66
10
3
×
()
--------------------------------------------------------------------------
=
1.025 V
()
=
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