ICL7135C Datasheet, PDF (2/11 Pages) Texas Instruments – 4 1/2-DIGIT PRECISION ANALOG-TO-DIGITAL CONVERTERS

ICL7135C, TLC7135C
4 1/2-DIGIT PRECISION
ANALOG-TO-DIGITAL CONVERTERS
SLAS074B – DECEMBER 1986 – REVISED MAY 1999
functional block diagram
23
POLARITY
From Analog
Section
Polarity
Flip-Flop
DIGITAL SECTION
Latch
22
CLK
25
RUN/HOLD ₂₇
OVER RANGE
28
UNDER RANGE
26
STROBE
21
BUSY
24
DGTL GND
Zero
Cross
Detect
Control
Logic
Counters
Latch
Latch
Latch
Latch
20
D1 (LSD)
19
D2
18
D3
17 _D4
12 _{D5 (MSD)}
Digit
Drive
Output
Multiplexer
13
B1 (LSB)
14 _B2
15
B4
16
B8 (MSB)
Binary
Coded
Decimal
Output
A/Z
2
REF
INT
10
IN +
ANALOG SECTION
Cref
8 ^Cref +
Cref _{– 7}
BUFF
OUT ₆
RINT
5
CAZ
AUTO
ZERO
CINT
4 INT OUT
Buffer
Input
High
DE(–) _DE(+)
Z/I
Integrator
A/Z
Comparator
+
–
To
Digital
Section
A/Z
ANLG
3
COMMON
INT
IN – ⁹
A/Z
DE(+) DE(–)
A/Z, DE( ±), Z/I
Input
Low
2
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265