MAX1491 datasheet(7/25 Pages) MAXIM

Part #	MAX1491

Description	3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

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Manufacturer	MAXIM [Maxim Integrated Products]

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3.5- and 4.5-Digit, Single-Chip

ADCs with LCD Drivers

_______________________________________________________________________________________

7

Pin Description

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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