WITH TC7106A/7017A Dave Gillooly TC7106A/7106 digit analog-t

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WITH TC7106A/7017A Dave Gillooly TC7106A/7106 digit analog-t

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POWER SUPPLY OPERATION
WITH TC7106A/7017A
Dave Gillooly
TC7106A/7106 digit analog-to-digital (ADC) converters with liquid crystal display drive powered from power supplies easily. cost voltage regulators such LM7805 (+5V) LM7905 (-5V) power TC7106A/7016 Figure Analog common, internally referenced below positive supply potential, used supply converter reference. only available cost TC7660 DC-to-DC converter easily generates supply Figure TC7107A/7107 display converter also powered TC7660. external voltage reference replaces internal reference Figure Chip temperature variations caused changing display drive current cause full-scale drift internal reference does have temperature coefficient. Input signal magnitude corresponding seven segment display code determine many segment drivers active. TC7107A features improved temperature drift internal voltage reference. TC7107A directly compatible with first generation ICL7107 device lowers temperature induced full-scale drift. (See TC7107A Data Sheet.)
APPLICATION NOTE
+15V LM7805 POSITIVE VOLTAGE REGULATOR
REGULATOR
ANALOG INPUT
+INPUT
VREF+
-INPUT
TC7106/7106A
VREF-
VREF 100mV
ANALOG COMMON
TC7107 ONLY
REGULATOR
NEGATIVE REGULATOR LM7905
-15V
Figure TC7106/7106A Operates from Power Supplies
AN12-1
POWER SUPPLY OPERATION
WITH TC7106A/5C7107A
AN-12
UNREGULATED SUPPLY INPUT SYSTEM POWER LM7805 VOLTAGE REGULATOR
ANALOG INPUT
+INPUT
VREF+
-INPUT
TC7107A/7107 TC7106A/7106
TC7107A ONLY -15V)
VREF-
VREF 100mV
ANALOG COMMON
CONVERTER
VREF ---------
TC7660
Figure TC7106/7106A Operates from Power Supplies
UNREGULATED SUPPLY INPUT SYSTEM POWER
VOLTAGE REGULATOR
ANALOG INPUT
+INPUT
VREF+
VREF 100mV
TC9491 1.2V
TC7107
-INPUT ANALOG COMMON VREF- -15V
TC7107A ONLY
VREF (---------
TC7660
Figure TC7106/7106A Operates from Power Supplies
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TelCom Semiconductor 1300 Terra Bella Avenue P.O. 7267 Mountain View, 94039-7267 TEL: 650-968-9241 FAX: 650-967-1590 E-Mail: liter@c2smtp.telcom-semi.com TelCom Semiconductor Austin Product Center 9101 Burnet Suite Austin, 78758 TEL: 512-873-7100 FAX: 512-873-8236 TelCom Semiconductor H.K. Ltd. Chuk Street, Ground Floor Kong, Kowloon Hong Kong TEL: 852-2324-0122 FAX: 852-2354-9957
Printed U.S.A. 9/5/95

WITH TC7106A/7017A Dave Gillooly TC7106A/7106 digit analog-t

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