MAX1492 Datasheet, PDF (2/35 Pages) Maxim Integrated Products – 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
ABSOLUTE MAXIMUM RATINGS
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
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.
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
DC ACCURACY
Noise-Free Resolution
Integral Nonlinearity (Note 1)
SYMBOL
CONDITIONS
MAX1494
MAX1492
2.000V range
INL
200mV range
MIN TYP MAX UNITS
-19,999
-1999
+19,999
+1999 ^Count
±1
Count
±1
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
Output Noise
Offset Error (Zero Input Reading)
Offset V_IN = 0 (Note 2)
Gain Error
(Note 3)
Offset Drift (Zero-Reading Drift)
Gain Drift
V_IN = 0 (Note 4)
INPUT CONVERSION RATE
External Clock Frequency
External-Clock Duty Cycle
Conversion Rate
Internal clock
External clock, f_CLK = 4.915MHz
ANALOG INPUTS (AIN+, AIN-, bypass to GND with 0.1µF or greater capacitors)
AIN Input-Voltage Range
(Note 5)
RANGE bit = 0, ±2V
RANGE bit = 1, ±200mV
±1
Count
10
µV_P-P
-0
0 Reading
-0.5
+0.5 %FSR
0.1
µV/°C
±1
ppm/°C
4.915
40
60
5
5
MHz
%
Hz
-2.0
+2.0
V
-0.2
+0.2
AIN Absolute Input Voltage to
GND
-2.2
+2.2
V
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