ICL7135CPI Intersil, ICL7135CPI Datasheet - Page 13

• Manufacturer Part Number: ICL7135CPI
• Description: IC CONV A/D 4 1/2 DIGIT 28-DIP
• Manufacturer: Intersil

Specifications of ICL7135CPI

• Rohs Status: RoHS non-compliant
• Other names: ICL7135CPIIS; NT5015

Design Information Summary Sheet
• CLOCK INPUT
• CLOCK PERIOD
• INTEGRATION PERIOD
• 60/50Hz REJECTION CRITERION
• OPTIMUM INTEGRATION CURRENT
• FULL-SCALE ANALOG INPUT VOLTAGE
• INTEGRATE RESISTOR
• INTEGRATE CAPACITOR
• INTEGRATOR OUTPUT VOLTAGE SWING
• V
Typical Integrator Amplifier Output Waveform (INT Pin)
The ICL7135 does not have an internal oscillator. It
requires an external clock.
f
t
t
t
I
V
R
C
V
(V- + 0.5) < V
V
CLOCK
CLOCK
INT
INT
INT
INT
lNFS
INT
INT
INT
INT
/t
= 10,000 x t
= 20μA
MAXIMUM SWING:
Typically = 2.7V
60Hz
=
=
=
(Typ) = 200mV or 2V
(
------------------------------- -
V
---------------- -
(
------------------------------- -
(Typ) = 120kHz
= 1/f
t
t
I
INT
INFS
INT
INT
C
or t
V
INT
) I
INT
) I
CLOCK
(
(
INT
INT
INT
INT
CLOCK
< (V+ - 0.5V)
/t
)
)
50Hz
AUTO ZERO PHASE
30001 - 10001
= Integer
(COUNTS)
13
TOTAL CONVERSION TIME = 40002 x t
10000 COUNTS
PHASE FIXED
INTEGRATE
ICL7135
• DISPLAY COUNT
• CONVERSION CYCLE
• COMMON MODE INPUT VOLTAGE
• AUTO-ZERO CAPACITOR
• REFERENCE CAPACITOR
• POWER SUPPLY: DUAL ±5V
• OUTPUT TYPE
COUNT
t
when f
(V- + 1V) < V
0.01μF < C
0.1μF < C
V+ = +5V to GND
V- = -5V to GND
4 BCD Nibbles with Polarity and Overrange Bits
There is no internal reference available on the ICL7135. An
external reference is required due to the ICL7135’s 4
digit resolution.
CYC
= t
CLOCK
CLOCK
=
CL0CK
DE-INTEGRATE PHASE
REF
10 000
1 - 20001 COUNTS
AZ
,
lN
= 120kHz, t
< 1μF
< 1μF
x 40002
< (V+ - 0.5V)
×
---------------- -
V REF
V IN
CYC
= 333ms
FN3093.4
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