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MAX874CPA Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX874CPA Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 8 page 10µA, Low-Dropout, Precision Voltage References Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. TEMP Output The TEMP output provides a voltage proportional to the MAX872/MAX874 junction temperature. Since the power dissipation of the MAX872/MAX874 is <100µW typ, the junction temperature is within 0.5°C of the ambient temperature. Although it goes unused in most applications, the ambient temperature information given by the TEMP output may be used to control LCD contrast, or to provide ADC gain compensation or ther- mal out-of-range indication. TEMP must be buffered or connected to a high-impedance input. Operating Temperature Window Comparator In Figure 3, a window comparator monitors the TEMP output and indicates if the temperature is out of the nominal operating range. For the resistor values shown, the circuit will indicate an out-of-range condition if the ambient temperature should rise above +85°C or dip below -40°C. Start-Up When the input voltage is below the factory-selected output voltage, the MAX872/MAX874 can draw exces- sive supply current (hundreds of microamps). If the source resistance is too high, the voltage drop across the source resistance can prevent the input voltage to the device from reaching the minimum dropout voltage. Therefore, when using the MAX872/MAX874 in low- dropout applications, ensure that the power supply has a low source resistance. GND 0.047 µF 4.7 µF COMP 150 Ω VIN VOUT MAX872 MAX874 3.0V (MAX872) 5.0V (MAX874) 100 µF Figure 2. Input Filter Reduces Input Ripple GND V+ VOUT 170k (MAX872) 330k (MAX874) 27k 54k VIN TEMP MAX872 MAX874 1/2 MAX922 +5V UNDER TEMP -40°C TO +85°C OPERATING RANGE OVER TEMP REF OUT 1/4 74HC86 TEMP OUT OF RANGE +5V 1/2 MAX922 Figure 3. Operating Temperature Range Window Comparator ___________________Chip Topography GND TEMP VIN *N.C. OUT TRIM 0.110" (2.794mm) 0.072" (1.829mm) *N.C. COMP *MAKE NO CONNECTIONS TO THESE PADS TRANSISTOR COUNT: 89 SUBSTRATE CONNECTED TO GND. MAX872/MAX874 |
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