ICL7135CPIZ Intersil, ICL7135CPIZ Datasheet - Page 9

• Manufacturer Part Number: ICL7135CPIZ
• Description: IC ADC 4.5DIGIT MUXED BCD 28DIP
• Manufacturer: Intersil

Specifications of ICL7135CPIZ

• Display Type: LED, LCD
• Configuration: 7 Segment
• Interface: BCD
• Digits Or Characters: A/D 4.5 Digits
• Current - Supply: 1.1mA
• Voltage - Supply: 4 V ~ 6 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 28-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Power Supplies
The ICL7135 is designed to work from ±5V supplies.
However, in selected applications no negative supply is
required. The conditions to use a single +5V supply are:
See “differential input” for a discussion of the effects this will
have on the integrator swing without loss of linearity.
Typical Applications
The circuits which follow show some of the wide variety of
possibilities and serve to illustrate the exceptional versatility
of this A/D converter.
Figure 7 shows the complete circuit for a 4
full scale) A/D with LED readout using the ICL8069 as a
1.2V temperature compensated voltage reference. It uses
the band-gap principal to achieve excellent stability and low
noise at reverse currents down to 50μA. The circuit also
shows a typical R-C input filter. Depending on the
application, the time-constant of this filter can be made
faster, slower, or the filter deleted completely. The
LED is driven from the 7 segment decoder, with a zero
reading blanked by connecting a D5 signal to RBl input of
1. The input signal can be referenced to the center of the
2. The signal is less than ±1.5V.
NOTE:
1. For finer resolution on scale factor adjust, use a 10 turn pot or a small pot in series with
ANALOG
common mode range of the converter.
ICL8069
SIGNAL
INPUT
a fixed resistor.
6.8kΩ
GND
100kΩ
+5V
1
2
0.1μF
100K
(NOTE 1)
FIGURE 7. 4
V
1.000V
REF
27Ω
0.47μF
100kΩ
1μF
+5V
1μF
=
10kΩ
-5V
9
1
10
11
12
13
14
/
1
2
3
4
5
6
7
8
9
2
DIGIT A/D CONVERTER WITH A MULTIPLEXED COMMON ANODE LED DISPLAY
V-
REF
ANALOG
COMMON
INT OUT
AZ
BUF OUT
RC1
RC2
INPUT LO
INPUT HI
V+
D5
B1
B2
IN
ICL7135
1
/
2
digit (±2.000V)
DIG. GND
STROBE
CLOCK
BUSY
POL
R/H
1
UR
OR
D1
D2
D3
D4
B8
B4
/
2
digit
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ICL7135
4.7K
150Ω
150Ω
the decoder. The 2-gate clock circuit should use CMOS
gates to maintain good power supply rejection.
A suitable circuit for driving a plasma-type display is shown
in Figure 8. The high voltage anode driver buffer is made by
Dionics. The 3 AND gates and caps driving “BI” are needed
for interdigit blanking of multiple-digit display elements, and
can be omitted if not needed. The 2.5kΩ and 3kΩ resistors
set the current levels in the display. A similar arrangement
can be used with Nixie
The popular LCD displays can be interfaced to the outputs of
the ICL7135 with suitable display drivers, such as the
ICM7211A as shown in Figure 9. A standard CMOS 4030
QUAD XOR gate is used for displaying the
polarity, and an “overrange” flag. A similar circuit can be
used with the ICL7212A LED driver and the ICM7235A
vacuum fluorescent driver with appropriate arrangements
made for the “extra” outputs. Of course, another full driver
circuit could be ganged to the one shown if required. This
would be useful if additional annunciators were needed. The
Figure shows the complete circuit for a 4
A/D.
Figure 10 shows a more complicated circuit for driving LCD
displays. Here the data is latched into the ICM7211 by the
STROBE signal and “Overrange” is indicated by blanking the
4 full digits.
5
4
3
2
1
®
tubes.
C
150Ω
47K
RC NETWORK
R
A
B
C
D
E
G
F
7447
RBI
1
+5V
/
ƒ
2
1
OSC
digit (±2.000V)
B1
B2
B4
B8
/
2
digit, the
= 0.45/RC
FN3093.4