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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)
INTREF, RANGE, DPSET1, DPSET2, PEAK,
HOLD to GND ......................................-0.3V to (DV DD + 0.3V)
DPON to GND..........................................-0.3V to (DV DD + 0.3V)
Continuous Power Dissipation (T A = +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
V NEG to GND ...........................................-2.6V to (AV DD + 0.3V)
Maximum Current into Any Pin ...........................................50mA
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), C NEG = 0.1μF. All specifications are T MIN
to T MAX , unless otherwise noted. Typical values are at +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC ACCURACY
Noise-Free Resolution
MAX1493/MAX1495
MAX1491
-19,999
-1999
+19,999
+1999
Count
Integral Nonlinearity (Note 1)
Range Change Accuracy
Rollover Error
Output Noise
INL
2.000V range
200mV range
(V AIN+ - V AIN- = 0.100V) on 200mV range /
(V AIN+ - V AIN- = 0.100V) on 2.0V range
V AIN+ - V AIN- = full scale,
V AIN- - V AIN+ = full scale
±1
±1
10:1
±1.0
10
Count
Ratio
Count
μV P-P
Offset Error (Zero Input Reading)
Gain Error
Offset Drift (Zero Reading Drift)
Offset
V IN = 0 (Note 2)
(Note 3)
V IN = 0
-0
-0.5
0.1
+0
+0.5
Reading
%FSR
μV/ ° C
Gain Drift
INPUT CONVERSION RATE
Conversion Rate
ANALOG INPUTS (AIN+, AIN-) (bypass to GND with 0.1μF or greater capacitors)
±1
5
ppm/ ° C
Hz
AIN Input Voltage Range
Differential (Note 4)
RANGE = GND
RANGE = DV DD
-2.0
-0.2
+2.0
+0.2
V
Absolute GND referenced
-2.2V
+2.2V
Normal Mode 50Hz and 60Hz
Rejection (Simultaneously)
50Hz and 60Hz ±2%
100
dB
Common-Mode 50Hz and 60Hz
Rejection (Simultaneously)
Common-Mode Rejection
Input Leakage Current
Input Capacitance
CMR
CMR
For 50Hz ±2% and 60Hz ±2%,
R SOURCE < 10k ?
At DC
T A = +25 ° C
150
100
10
10
dB
dB
nA
pF
Dynamic Input Current
(Note 5)
-20
+20
nA
2
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