MAX1492 datasheet(4/35 Pages) MAXIM

Part #	MAX1492

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

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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4 / 35 page

3.5- and 4.5-Digit, Single-Chip ADCs

with LCD Drivers

4

_______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

(AVDD = DVDD = +2.7V to +5.25V, GND = 0, VREF+ - VREF- = 2.048V (external reference). Internal clock mode, unless otherwise noted.

All specifications are at TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

CHARGE PUMP (CNEG = 0.1µF)

Output Voltage

VNEG

-2.60

-2.42

-2.30

V

DIGITAL INPUTS (SCLK, DIN,

CS, CLK)

Input Current

IIN

VIN = 0 or DVDD

-10

+10

µA

Input Low Voltage

VINL

0.3 x

DVDD

V

Input High Voltage

VINH

0.7 x DVDD

V

Input Hysteresis

VHYST

DVDD = 3.0V

200

mV

DIGITAL OUTPUTS (DOUT,

EOC)

Output Low Voltage

VOL

ISINK = 1mA

0.4

V

Output High Voltage

VOH

ISOURCE = 200µA

0.8 x DVDD

V

Tri-State Leakage Current

IL

DOUT only

-10

+10

µA

Tri-State Output Capacitance

COUT

DOUT only

15

pF

POWER SUPPLY

AVDD Voltage

AVDD

2.70

5.25

V

DVDD Voltage

DVDD

2.70

5.25

V

Power-Supply Rejection AVDD

PSRRA

(Note 7)

80

dB

Power-Supply Rejection DVDD

PSRRD

(Note 7)

100

dB

AVDD = 5V

580

660

AVDD Current (Notes 8, 9)

IAVDD

Standby

240

380

µA

DVDD = 5V

260

320

DVDD = 3.3V

130

180

DVDD Current (Notes 8, 9)

IDVDD

Standby

10

20

µA

LCD DRIVER

MAX1492

1.92 x

DVDD

RMS Segment On Voltage

MAX1494

1.92 x

(DVDD - VDISP)

V

MAX1492

1/3 x

DVDD

RMS Segment Off Voltage

MAX1494

1/3 x

(DVDD - VDISP)

V

Display Voltage Setup Resistor

RDISP

MAX1494 only

157.5

k

Ω

Display Multiplex Rate

107

Hz

LCD Data-Update Rate

2.5

Hz

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