Rainbow Electronics MAX1494 - Manual (Page 2)

MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
AV DD to GND............................................................-0.3V to +6V
DV DD to GND ...........................................................-0.3V to +6V
AIN+, AIN- to GND ................................V NEG to +(AV DD + 0.3V)
REF+, REF- to GND...............................V NEG to +(AV DD + 0.3V)
LOWBATT to GND ...................................-0.3V to (AV DD + 0.3V)
CLK, EOC, CS, DIN, SCLK, DOUT to
GND .....................................................-0.3V to (DV DD + 0.3V)
SEG_ and BP_ to GND ............................-0.3V to (DV DD + 0.3V)
V NEG to GND ...........................................-2.6V to (AV DD + 0.3V)
V DISP to GND ...........................................-0.3V to (DV DD + 0.3V)
Maximum Current into Any Pin ...........................................50mA
Continuous Power Dissipation (T A = +70°C)
28-Pin SSOP (derate 9.5mW/°C above +70°C) ...........762mW
28-Pin PDIP (derate 14.3mW/°C above +70°C)......1142.9mW
32-Pin TQFP (derate 20.7mW/°C above +70°C).....1652.9mW
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
ELECTRICAL CHARACTERISTICS
(AV
DD
= DV
DD
= +2.7V to +5.25V, GND = 0, V
REF+
- V
REF-
= 2.048V (external reference). Internal clock mode, unless otherwise noted.
All specifications are at T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC ACCURACY
MAX1494 -19,999 +19,999
Noise-Free Resolution
MAX1492 -1999 +1999
Count
2.000V range ±1
Integral Nonlinearity (Note 1) INL
200mV range ±1
Count
Range Change Accuracy
(V AIN+ - V AIN- = 0.100V) on 200mV range /
(V AIN+ - V AIN- = 0.100V) on 2.0V range
10:1 Ratio
Rollover Error (See the Definitions
Section) V AIN+ - V AIN- = full scale,
V AIN- - V AIN+ = full scale
±1 Count
Output Noise 10 µV P-P
Offset Error (Zero Input Reading) Offset V IN = 0 (Note 2) -0 0 Reading
Gain Error (Note 3) -0.5 +0.5 %FSR
Offset Drift (Zero-Reading Drift) V IN = 0 (Note 4) 0.1 µV/ °C
Gain Drift ±1 ppm/ °C
INPUT CONVERSION RATE
External Clock Frequency 4.915 MHz
External-Clock Duty Cycle 40 60 %
Internal clock 5
Conversion Rate
External clock, f CLK = 4.915MHz 5
Hz
ANALOG INPUTS (AIN+, AIN-, bypass to GND with 0.1µF or greater capacitors)
RANGE bit = 0, ±2V -2.0 +2.0 AIN Input-Voltage Range
(Note 5)
RANGE bit = 1, ±200mV -0.2 +0.2
V
AIN Absolute Input Voltage to
GND
-2.2 +2.2 V