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