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MAX874CPA Datasheet(PDF) 8 Page - Maxim Integrated Products

Part # MAX874CPA
Description  10關A, Low-Dropout, Precision Voltage References
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX874CPA Datasheet(HTML) 8 Page - Maxim Integrated Products

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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
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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