ICL7116 Intersil, ICL7116 Datasheet - Page 4

• Manufacturer Part Number: ICL7116
• Description: 31/2 Digit/ LCD/LED Display/ A/D Converter with Display Hold
• Manufacturer: Intersil

Design Information Summary Sheet
• OSCILLATOR FREQUENCY
• OSCILLATOR PERIOD
• INTEGRATION CLOCK FREQUENCY
• 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)
f
C
f
t
f
t
t
I
V
(V- + 1.0V) < V
R
C
V
OSC
OSC
OSC
CLOCK
INT
INT
INT
lNFS
INT
OSC
INT
INT
INT
/t
= 1000 x (4/f
= 4 A
MAXIMUM SWING:
60Hz
= 0.45/RC
(Typ) = 48kHz
= RC/0.45
=
=
=
> 50pF; R
(Typ) = 200mV or 2V
V
---------------- -
------------------------------- -
------------------------------- -
= f
t
I
t
INFS
INT
INT
INT
OSC
or t
C
V
INT
INT
lNT
I
I
INT
INT
INT
/4
OSC
OSC
/t
AUTO ZERO PHASE
< (V+ - 0.5V), V
50Hz
2999 - 1000
> 50k
(COUNTS)
)
= Integer
INT
TOTAL CONVERSION TIME = 4000 x t
(Typ) = 2V
SIGNAL INTEGRATE
1000 COUNTS
PHASE FIXED
ICL7116, ICL7117
4
• DISPLAY COUNT
• CONVERSION CYCLE
• COMMON MODE INPUT VOLTAGE
• AUTO-ZERO CAPACITOR
• REFERENCE CAPACITOR
• V
• V
• ICL7116 POWER SUPPLY: SINGLE 9V
• ICL7116 DISPLAY: LCD
• ICL7117 POWER SUPPLY: DUAL 5.0V
• ICL7117 DISPLAY: LED
t
t
when f
(V- + 1V) < V
0.01 F < C
0.1 F < C
Biased between V+ and V-.
Regulation lost when V+ to V- < 6.8V.
If V
the V
V+ - V- = 9V
Digital supply is generated internally
V
Type: Direct drive with digital logic supply amplitude.
V+ = +5V to GND
V- = -5V to GND
Digital Logic and LED driver supply V+ to GND
Type: Non-Multiplexed Common Anode
COUNT
CYC
CYC
COM
COM
TEST
CLOCK
COM
COM
= t
= t
OSC
CL0CK
OSC
=
DE-INTEGRATE PHASE
= 16,000 x t
V+ - 2.8V
is externally pulled down to (V + to V -)/2,
V+ - 4.5V
REF
1000
circuit will turn off.
0 - 1999 COUNTS
AZ
= 48KHz; t
lN
x 16,000
< 1 F
< 1 F
x 4000
< (V+ - 0.5V)
-------------- -
V
OSC
V
REF
IN
CYC
= 333ms