ICL7135C_14 Datasheet, PDF (2/18 Pages) Texas Instruments – Zero Reading for 0-V Input Precision Null Detection With True Polarity at Zero

ICL7135C, TLC7135C
4 1/2ĆDIGIT PRECISION
ANALOGĆTOĆDIGITAL CONVERTERS
SLAS074D − DECEMBER 1986 − REVISED SEPTEMBER 2003
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
REF ²
INT
IN + ¹⁰
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
9
IN −
A/Z
DE(+) DE(−)
A/Z, DE( ±), Z/I
Input
Low
2
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