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TC820 Datasheet(PDF) 14 Page - Microchip Technology

Part # TC820
Description  3-3/4 Digit A/D Converter with Frequency Counter and Logic Probe
PDF  28 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC820 Datasheet(HTML) 14 Page - Microchip Technology

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TC820
DS21476B-page 14
© 2002 Microchip Technology Inc.
FIGURE 3-7:
COMMON MODE VOLTAGE REMOVED IN BATTERY OPERATION WITH
VIN = ANALOG COMMON
FIGURE 3-8:
COMMON MODE VOLTAGE REDUCES AVAILABLE INTEGRATOR SWING
(VCOM ≠ VIN)
TC820
GND
GND
V+ V-
V+
V-
Measured
System
Power
Source
9V
VIN+
VDD
VSS
VREF+
VREF-
VIN-
VBUF
CAZ
BP1
VINT
BP3
BP2
OSC1
OSC2
OSC3 NC
Segment
Drive
LCD
Analog
Common
+
+
–
+
–
RI
CI
VI
VIN
Integrator
Input Buffer
+
–
TI = Integration Time =
CI = Integration Capacitor
RI = Integration Resistor
4000
FOSC
VCM
Where:
VI =
[
[
VCM – VIN
TI
RI CI



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