TC820 TelCom Semiconductor, TC820 Datasheet - Page 7

• Manufacturer Part Number: TC820
• Description: 3-3/4 DIGIT A/D CONVERTER WITH FREQUENCY COUNTER AND LOGIC PROBE
• Manufacturer: TelCom Semiconductor

3-3/4 A/D CONVERTER WITH
FREQUENCY COUNTER
AND LOGIC PROBE
FUNCTIONAL BLOCK DIAGRAM
COMMON
TELCOM SEMICONDUCTOR, INC.
V
V
V DD
REF
REF
+
–
V SS
V
V
C
IN
IN
+
–
REF
+
C
REF V BUFF
–
DGND UR OR
DETECT
C AZ
BATT
LOW
A/D CONTROL
UNDERRANGE
OVERRANGE
RANGE/FREQ
V INT
HOLD
EOC/
RANGE
TO LCD
INPUT
OSC1
DEINT
EOC
OSC2
PEAK
HOLD
TC820
2
OSC3
ANNUNC
LOW BATT
B
A
SEL
FREQUENCY COUNTER INPUT
A/D COUNTER SELECT
LOGIC
LOW
V DISP
8
(3999 COUNTS)
RANGE
COMPARATOR
A > B
A/D COUNTER
BUZ IN
SEG0 • • • BP3
DISPLAY
DRIVERS
TRIPLEX
LATCH
LOGIC
LOW
15
TC820
BUZZER
DRIVER
RANGE/
FREQ
FREQ/
VOLTS
LOGIC
DP0/LO
DP1/HI
3-155
1
2
3
4
5
6
7
8