MAX1491CAI datasheet(2/25 Pages) MAXIM

Part #	MAX1491CAI

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

2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(AVDD = DVDD = +2.7V to +5.25V, GND = 0, VREF+ - VREF- = 2.048V (external reference), CNEG= 0.1µF. All specifications are TMIN

to TMAX, unless otherwise noted. Typical values are at +25°C, unless otherwise noted.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

AVDD to GND............................................................-0.3V to +6V

DVDD to GND ...........................................................-0.3V to +6V

AIN+, AIN- to GND ...............................VNEG to + (AVDD + 0.3V)

REF+, REF- to GND..............................VNEG to + (AVDD + 0.3V)

LOWBATT to GND ...................................-0.3V to (AVDD + 0.3V)

INTREF, RANGE, DPSET1, DPSET2, PEAK,

HOLD to GND ......................................-0.3V to (DVDD + 0.3V)

DPON to GND..........................................-0.3V to (DVDD + 0.3V)

VNEG to GND ...........................................-2.6V to (AVDD + 0.3V)

Maximum Current into Any Pin ...........................................50mA

Continuous Power Dissipation (TA = +70°C)

32-Pin TQFP (derate 20.7mW/°C above +70°C).....1652.9mW

28-Pin SSOP (derate 9.5mW/°C above +70°C) ...........762mW

28-Pin DIP (derate 14.3mW/°C above +70°C) ........1142.9mW

Operating Temperature Range...............................0°C to +70°C

Junction Temperature ......................................................+150°C

Storage Temperature Range .............................-60°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

DC ACCURACY

MAX1493/MAX1495

-19,999

+19,999

Noise-Free Resolution

MAX1491

-1999

+1999

Count

2.000V range

±1

Integral Nonlinearity (Note 1)

INL

200mV range

±1

Count

Range Change Accuracy

(VAIN+ - VAIN- = 0.100V) on 200mV range /

(VAIN+ - VAIN- = 0.100V) on 2.0V range

10:1

Ratio

Rollover Error

VAIN+ - VAIN- = full scale,

VAIN- - VAIN+ = full scale

±1.0

Count

Output Noise

10

µVP-P

Offset Error (Zero Input Reading)

Offset

VIN = 0 (Note 2)

-0

+0

Reading

Gain Error

(Note 3)

-0.5

+0.5

%FSR

Offset Drift (Zero Reading Drift)

VIN = 0

0.1

µV/

°C

Gain Drift

±1

ppm/

°C

INPUT CONVERSION RATE

Conversion Rate

5Hz

ANALOG INPUTS (AIN+, AIN-) (bypass to GND with 0.1µF or greater capacitors)

RANGE = GND

-2.0

+2.0

Differential (Note 4)

RANGE = DVDD

-0.2

+0.2

AIN Input Voltage Range

Absolute GND referenced

-2.2V

+2.2V

V

Normal Mode 50Hz and 60Hz

Rejection (Simultaneously)

50Hz and 60Hz ±2%

100

dB

Common-Mode 50Hz and 60Hz

Rejection (Simultaneously)

CMR

For 50Hz ±2% and 60Hz ±2%,

RSOURCE < 10k

Ω

150

dB

Common-Mode Rejection

CMR

At DC

100

dB

Input Leakage Current

TA = +25

°C10

nA

Input Capacitance

10

pF

Dynamic Input Current

(Note 5)

-20

+20

nA

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