MAX1491/MAX1493/MAX1495
3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.)
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)
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)
V
NEG
to GND ...........................................-2.6V to (AV
DD
+ 0.3V)
Maximum Current into Any Pin ...........................................50mA
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
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
(V
AIN+
- V
AIN-
= 0.100V) on 200mV range /
(V
AIN+
- V
AIN-
= 0.100V) on 2.0V range
10:1 Ratio
Rollover Error
V
AIN+
- V
AIN-
= full scale,
V
AIN-
- V
AIN+
= full scale
±1.0 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 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 = DV
DD
-0.2 +0.2AIN 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%,
R
SOURCE
< 10kΩ
150 dB
Common-Mode Rejection CMR At DC 100 dB
Input Leakage Current T
A
= +25°C10nA
Input Capacitance 10 pF
Dynamic Input Current (Note 5) -20 +20 nA
(16 Seiten)
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