Datasheet ICL7106, ICL7107, ICL7107S (Intersil) - 5

ICL7106, ICL7107, ICL7107S Design Information Summary Sheet • OSCILLATOR FREQUENCY • DISPLAY COUNT fOSC = 0.45/RC V COUNT = 1000 IN  C -------- OSC > 50pF; ROSC > 50kΩ VREF fOSC (Typ) = 48kHz • CONVERSION CYCLE • OSCILLATOR PERIOD tCYC = tCL0CK x 4000 tOSC = RC/0.45 tCYC = tOSC x 16,000 when f • INTEGRATION CLOCK FREQUENCY OSC = 48kHz; tCYC = 333ms f • COMMON MODE INPUT VOLTAGE CLOCK = fOSC/4 (V- + 1V) < V • INTEGRATION PERIOD lN < (V+ - 0.5V) t • AUTO-ZERO CAPACITOR INT = 1000 x (4/fOSC) 0.01µF < C • 60/50Hz REJECTION CRITERION AZ < 1µF t • REFERENCE CAPACITOR INT/t60Hz or tlNT/t60Hz = Integer 0.1µF < C • OPTIMUM INTEGRATION CURRENT REF < 1µF I • V INT = 4µA COM Biased between Vi and V-. • FULL SCALE ANALOG INPUT VOLTAGE V • V lNFS (Typ) = 200mV or 2V COM  V+ - 2.8V Regulation lost when V+ to V- < 6.8V • INTEGRATE RESISTOR If VCOM is externally pulled down to (V+ to V-)/2, V R INFS = --------- the VCOM circuit will turn off. INT IINT • ICL7106 POWER SUPPLY: SINGLE 9V • INTEGRATE CAPACITOR V+ - V- = 9V t   INT IINT Digital supply is generated internally CINT = ---------------- VINT VGND  V+ - 4.5V • INTEGRATOR OUTPUT VOLTAGE SWING • ICL7106 DISPLAY: LCD t   INT IINT Type: Direct drive with digital logic supply amplitude. VINT = ---------------- CINT • ICL7107 POWER SUPPLY: DUAL ±5.0V • VINT MAXIMUM SWING: V+ = +5V to GND (V- + 0.5V) < VINT < (V+ - 0.5V), VINT (Typ) = 2V V- = -5V to GND Digital Logic and LED driver supply V+ to GND • ICL7107 DISPLAY: LED Type: Nonmultiplexed Common Anode Typical Integrator Amplifier Output Waveform (INT Pin)
AUTO ZERO PHASE SIGNAL INTEGRATE DEINTEGRATE PHASE (COUNTS) PHASE FIXED 0 - 1999 COUNTS 2999 - 1000 1000 COUNTS TOTAL CONVERSION TIME = 4000 x tCLOCK = 16,000 x tOSC
FN3082 Rev 9.00 Page 5 of 17 October 24, 2014