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MAX1491 Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX1491 Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 25 page 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers _______________________________________________________________________________________ 7 Pin Description PIN MAX1491 MAX1493 MAX1495 NAME FUNCTION 1 30 INTREF Internal Reference Logic Input. Connect to GND to select external reference mode. Connect to DVDD to select the internal reference mode. 231 DVDD Digital Power Input. Connect DVDD to a 2.7V to 5.25V power supply. Bypass DVDD to GND with a 0.1µF and a 4.7µF capacitor. 3 32 GND Ground 41 AVDD Analog Power Input. Connect AVDD to a 2.7V to 5.25V power supply. Bypass AVDD to GND with a 0.1µF and a 4.7µF capacitor. 5 2 AIN+ Positive Analog Input. Positive side of fully differential analog input. Bypass AIN+ to GND with a 0.1µF or greater capacitor. 6 3 AIN- Negative Analog Input. Negative side of fully differential analog input. Bypass AIN- to GND with a 0.1µF or greater capacitor. 7 4 REF- Negative Reference Input. For internal reference operation, connect REF- to GND. For external reference operation, bypass REF- to GND with a 0.1µF capacitor and set VREF- from -2.2V to +2.2V, provided VREF+ > VREF-. 8 5 REF+ Positive Reference Input. For internal reference operation, connect a 4.7µF capacitor from REF+ to GND. For external reference operation, bypass REF+ to GND with a 0.1µF capacitor and set VREF+ from -2.2V to +2.2V, provided VREF+ > VREF-. 9 6 LOWBATT Low Battery Input. When VLOWBATT < 2.048V (typ), the LOWBATT symbol on the LCD turns on. 10 7 RANGE Range Logic Input. RANGE controls the fully differential analog input range. Connect to GND for the ±2V input range. Connect to DVDD for the ±200mV input range. 11 8 DPSET1 Decimal Point Logic Input 1. Controls the decimal point of the LCD. See the Decimal Point Control section. 12 9 DPSET2 Decimal Point Logic Input 2. Controls the decimal point of the LCD. See the Decimal Point Control section. 13 10 PEAK Peak Logic Input. Connect to DVDD to display the highest ADC value on the LCD. Connect to GND to disable the peak function. 14 11 HOLD Hold Logic Input. Connect to DVDD to hold the current ADC value on the LCD. Connect to GND to update the LCD at a rate of 2.5Hz and disable the hold function. For the MAX1495, placing the device into hold mode initiates an enhanced offset calibration. Assert HOLD high for a minimum of 2s to ensure the completion of enhanced offset calibration. 15 12 SEG1 LCD Segment 1 Driver 16 13 SEG2 LCD Segment 2 Driver 17 14 SEG3 LCD Segment 3 Driver 18 15 SEG4 LCD Segment 4 Driver 19 16 SEG5 LCD Segment 5 Driver 20 17 SEG6 LCD Segment 6 Driver |
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