MAX1497/MAX1499
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and µC Interface
_______________________________________________________________________________________ 3
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)
-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
REF Output Short-Circuit Current
1mA
REF Output Temperature
Coefficient
TC
VREF
Load Regulation I
SOURCE
= 0 to 300µA, I
SINK
= 0 to 30µA 6
0.1Hz to 10Hz 25
Noise Voltage
10Hz to 10kHz
400
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.)
(21 Seiten)
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