ICL7126_14 Datasheet, PDF (9/15 Pages) Intersil Corporation – 3 1/2 Digit, Low Power, Single Chip A/D Converter

ICL7126
a
a
f
b
g
b
e
c
d
BACKPLANE
21
LCD PHASE DRIVER
TYPICAL SEGMENT OUTPUT
V+
0.5mA
2mA
SEGMENT
OUTPUT
INTERNAL DIGITAL GROUND
7
SEGMENT
DECODE
7
SEGMENT
DECODE
7
SEGMENT
DECODE
LATCH
1000’s
100’s
10’s
1’s
COUNTER COUNTER COUNTER COUNTER
TO SWITCH DRIVERS
FROM COMPARATOR OUTPUT
† THREE INVERTERS.
ONE INVERTER SHOWN FOR CLARITY.
CLOCK
†
÷4
LOGIC CONTROL
INTERNAL
DIGITAL
GROUND
V_TH = 1V
40
OSC 1
39
OSC 2
38
OSC 3
1
HLDR
÷200
35
V+
6.2V
500Ω
TEST
37
26
V-
FIGURE 8. DIGITAL SECTION
INTERNAL TO PART
INTERNAL TO PART
÷4
CLOCK
÷4
40
39
38
TEST ICL7126
FIGURE 9A. EXTERNAL SIGNAL
40
39
38
R
C
FIGURE 9B. RC OSCILLATOR
FIGURE 9. CLOCK CIRCUITS
CLOCK
9
FN3084.5