Rainbow Electronics MAX1499 - Manual (Page 3)

MAX1497/MAX1499
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and µC Interface
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PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ANALOG INPUTS (AIN+, AIN-) (bypass to GND with 0.1µF or greater capacitors)
RANGE bit = 0 -2.0 +2.0
AIN Input Voltage Range (Note 5)
RANGE bit = 1 -0.2 +0.2
AIN Absolute Input Voltage
Range to GND
-2.2 +2.2
V
Internal clock mode, 50Hz and 60Hz ±2% 100
Normal-Mode 50Hz and 60Hz
Rejection (Simultaneously)
External clock mode, 50Hz and 60Hz ±2%,
f
CLK = 4.9152MHz
120
dB
Common-Mode 50Hz and 60Hz
Rejection (Simultaneously)
CMR For 50Hz and 60Hz ±2%, R SOURCE < 10kΩ 150 dB
Common-Mode Rejection CMR At DC 100 dB
Input Leakage Current 10 nA
Input Capacitance 10 pF
Average Dynamic Input Current (Note 6) -20 +20 nA
LOW-BATTERY VOLTAGE MONITOR (LOWBATT) (MAX1499 only)
LOWBATT TripThreshold 2.048 V
LOWBATT Leakage Current 10 pA
Hysteresis 20 mV
INTERNAL REFERENCE (REF- = GND, INTREF bit = 1) (bypass REF+ to GND with a 4.7µF capacitor)
REF Output Voltage V REF AV DD = V DD = 5V 2.007 2.048 2.089 V
REF Output Short-Circuit Current 1 mA
REF Output Temperature
Coefficient
TC VREF AV DD = V DD = 5V 40 ppm/°C
Load Regulation I SOURCE = 0 to 300µA, I SINK = 0 to 30µA 6 mV/µA
Line Regulation 50 µV/V
0.1Hz to 10Hz 25
Noise Voltage
10Hz to 10kHz 400
µV P-P
EXTERNAL REFERENCE (INTREF bit = 0) (bypass REF+ and REF- to GND with 0.1µF or greater capacitors)
REF Input Voltage Differential (V REF+ - V REF- ) 2.048
Absolute REF+, REF- Input
Voltage to GND
-2.2 +2.2
V
Internal clock mode, 50Hz and 60Hz ±2% 100
Normal-Mode 50Hz and 60Hz
Rejection (Simultaneously)
External clock mode, 50Hz and 60Hz ±2%,
f
CLK = 4.9152MHz
120
dB
Common-Mode 50Hz and 60Hz
Rejection (Simultaneously)
CMR For 50Hz and 60Hz ±2%, R SOURCE < 10kΩ 150 dB
Common-Mode Rejection CMR At DC 100 dB
Input Leakage Current 10 nA
ELECTRICAL CHARACTERISTICS (continued)
(AV DD = DV DD = V DD = +2.7V to +5.25V, GND = 0, GLED = 0, V LED = +2.7V to +5.25V, V REF+ - V REF- = 2.048V (external reference)
C REF+ = C REF- = 0.1µF, C VNEG = 0.1µF. Internal clock mode, unless otherwise noted. All specifications are at T A = T MIN to T MAX .
Typical values are at T
A
= +25°C, unless otherwise noted.)