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3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
Pin Description
PIN
MAX1491
1
2
3
4
5
6
MAX1493
MAX1495
30
31
32
1
2
3
NAME
INTREF
DV DD
GND
AV DD
AIN+
AIN-
FUNCTION
Internal Reference Logic Input. Connect to GND to select external reference mode. Connect
to DV DD to select the internal reference mode.
Digital Power Input. Connect DV DD to a 2.7V to 5.25V power supply. Bypass DV DD to GND
with a 0.1μF and a 4.7μF capacitor.
Ground
Analog Power Input. Connect AV DD to a 2.7V to 5.25V power supply. Bypass AV DD to GND
with a 0.1μF and a 4.7μF capacitor.
Positive Analog Input. Positive side of fully differential analog input. Bypass A IN+ to GND with
a 0.1μF or greater capacitor.
Negative Analog Input. Negative side of fully differential analog input. Bypass A IN- 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 V REF- from
-2.2V to +2.2V, provided V REF+ > V REF- .
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 V REF+ from -2.2V to +2.2V, provided V REF+ > V REF- .
9
6
LOWBATT Low Battery Input. When V LOWBATT < 2.048V (typ), the LOWBATT symbol on the LCD turns on.
10
11
12
13
7
8
9
10
RANGE
DPSET1
DPSET2
PEAK
Range Logic Input. RANGE controls the fully differential analog input range. Connect to GND
for the ±2V input range. Connect to DV DD for the ±200mV input range.
Decimal Point Logic Input 1. Controls the decimal point of the LCD. See the Decimal Point
Control section.
Decimal Point Logic Input 2. Controls the decimal point of the LCD. See the Decimal Point
Control section.
Peak Logic Input. Connect to DV DD to display the highest ADC value on the LCD. Connect to
GND to disable the peak function.
Hold Logic Input. Connect to DV DD 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
16
17
18
19
20
12
13
14
15
16
17
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
LCD Segment 1 Driver
LCD Segment 2 Driver
LCD Segment 3 Driver
LCD Segment 4 Driver
LCD Segment 5 Driver
LCD Segment 6 Driver
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