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ICL7109MDL883B Datasheet(PDF) 6 Page - Intersil Corporation |
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ICL7109MDL883B Datasheet(HTML) 6 Page - Intersil Corporation |
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6 / 25 page  6 Design Information Summary Sheet • OSCILLATOR FREQUENCY fOSC = 0.45/RC COSC > 50pF; ROSC > 50kΩ fOSC (Typ) = 60kHz or fOSC (Typ) = 3.58MHz Crystal • OSCILLATOR PERIOD tOSC = RC/0.45 tOSC = 1/3.58MHz (Crystal) • INTEGRATION CLOCK FREQUENCY fCLOCK = fOSC (RC Mode) fCLOCK = fOSC/58 (Crystal) tCLOCK = 1/fCLOCK • INTEGRATION PERIOD tINT = 2048 x tCLOCK • 60/50Hz REJECTION CRITERION tINT/t60Hz or tlNT/t50Hz = Integer • OPTIMUM INTEGRATION CURRENT IINT = 20µA • FULL-SCALE ANALOG INPUT VOLTAGE VlNFS Typically = 200mV or 2V • INTEGRATE RESISTOR • INTEGRATE CAPACITOR • INTEGRATOR OUTPUT VOLTAGE SWING •VINT MAXIMUM SWING (V- + 0.5V) < VINT < (V+ - 0.5V) VINT (Typ) = 2V • DISPLAY COUNT • CONVERSION CYCLE tCYC = tCL0CK x 8192 (In Free Run Mode, Run/HOLD = 1) when fCLOCK = 60kHz, tCYC = 133ms • COMMON MODE INPUT VOLTAGE (V- + 2.0V) < VlN < (V+ - 2V) • AUTO-ZERO CAPACITOR 0.01 µF < CAZ < 1µF • REFERENCE CAPACITOR 0.1 µF < CREF < 1µF •VREF Biased between V+ and V- VREF ≅ V+ - 2.8V Regulation lost when V+ to V- ≤ 6.4V. If VREF is not used, float output pin. • POWER SUPPLY: DUAL ±5.0V V+ = +5V to GND V- = -5V to GND • OUTPUT TYPE Binary Amplitude with Polarity and Overrange Bits Tips: Always tie TEST pin HIGH. Don’t leave any inputs floating. RINT VINFS IINT ----------------- = CINT tINT () IINT () VINT -------------------------------- = VINT tINT () IINT () CINT -------------------------------- = COUNT 2048 VIN VREF ----------------- × = ICL7109 |
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