MAX1495 查看數據表（PDF） - Maxim Integrated
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MAX1495 Datasheet PDF : 25 Pages
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3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
Pin Description
PIN
MAX1491
MAX1493
MAX1495
1
30
2
31
3
32
4
1
5
2
6
3
NAME
INTREF
DVDD
GND
AVDD
AIN+
AIN-
FUNCTION
Internal Reference Logic Input. Connect to GND to select external reference mode. Connect
to DVDD to select the internal reference mode.
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.
Ground
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.
Positive Analog Input. Positive side of fully differential analog input. Bypass AIN+ to GND with
a 0.1µF or greater capacitor.
Negative Analog Input. Negative side of fully differential analog input. Bypass AIN- to GND
with a 0.1µF or greater capacitor.
Negative Reference Input. For internal reference operation, connect REF- to GND. For
7
4
REF- external reference operation, bypass REF- to GND with a 0.1µF capacitor and set VREF- from
-2.2V to +2.2V, provided VREF+ > VREF-.
Positive Reference Input. For internal reference operation, connect a 4.7µF capacitor from
8
5
REF+ 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.
Hold Logic Input. Connect to DVDD to hold the current ADC value on the LCD. Connect to
14
11
HOLD
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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