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TC500ACOG713 View Datasheet(PDF) - Microchip Technology

Part NameDescriptionManufacturer
TC500ACOG713 Precision Analog Front Ends with Dual Slope ADC Microchip
Microchip Technology Microchip
TC500ACOG713 Datasheet PDF : 38 Pages
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9.0 DESIGN EXAMPLES
Refer to Figures 9-1 to 9-4.
Given:
Step 1.
Step 2.
Step 3.
Note:
Step 4.
Note:
Step 5.
Required Resolution: 16 bits (65,536
counts).
Maximum VIN: ±2V
Power Supply Voltage: +5V
60 Hz System
Pick integration time (tINT) as a multiple
of the line frequency:
1/60 Hz = 16.6 ms. Use 4x line
frequency.
= 66 ms
Calculate RINT:
RINT = VIN(MAX) /20 μA 2 /20 μA
= 100 k
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)
Microchip recommended capacitor:
Evox Rifa p/n: 5MR5 334K50J03L4.
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
(see Table 7-1)
Microchip recommended capacitor:
Evox Rifa p/n: 5MR5 224K50J02L4
Calculate VREF:
EQUATION 9-1:
VREF
=
-(--V----S--------0---.--9---)--(---C----I--N----T---)--(--R----I--N----T---)
2(TINT)
= (---4---.-1----)--(---0---.-3---3-----×----1---0------6---)--(---1---0---0----×-----1---0---3---)
2(66 × 103)
= 1.025 (V)
TC500/A/510/514
© 2008 Microchip Technology Inc.
DS21428E-page 19
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