Rainbow Electronics MAX1499 - Manual (Page 4)

MAX1497/MAX1499
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and µC Interface
4 _______________________________________________________________________________________
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Capacitance 10 pF
Average Dynamic Input Current (Note 6) -20 +20 nA
CHARGE PUMP
Output Voltage VNEG C VNEG = 0.1µF -2.60 -2.42 -2.30 V
DIGITAL INPUTS (SCLK, DIN, CS , CLK)
Input Current I IN V IN = 0 or DV DD = V DD -10 +10 µA
MAX1499
0.3 x
DV DD
Input Low Voltage V INL
MAX1497
0.3 x
V DD
V
MAX1499
0.7 x
DV DD
Input High Voltage V INH
MAX1497
0.7 x
V DD
V
Input Hysteresis V HYS DV DD = V DD = 3.0V 200 mV
DIGITAL OUTPUTS (DOUT, EOC )
Output Low Voltage V OL I SINK = 1mA 0.4 V
I SOURCE = 200µA, M AX 1499
0.8 x
DV DD
Output High Voltage V OH
I SOURCE = 200µA, M AX 1497
0.8 x
V DD
V
Tri-State Leakage Current I L DOUT only -1 +1 µA
Tri-State Output Capacitance C OUT DOUT only 15 pF
POWER SUPPLY (Note 10)
V DD Voltage V DD MAX1497 2.70 5.25 V
AV DD Voltage AV DD MAX1499 2.70 5.25 V
DV DD Voltage DV DD MAX1499 2.70 5.25 V
Power-Supply Rejection V DD PSRR (Note 7) 80 dB
Power-Supply Rejection AV DD PSRR A (Note 7) 80 dB
Power-Supply Rejection DV DD PSRR D (Note 7) 100 dB
V DD = 5.25V 664 744
V
DD
= 3.3V 618 663 V
DD
Current (Notes 8, 9) I
VDD
Standby mode 268 325
µA
AV DD = 5.25V 640
AV DD = 3.3V 600 AV DD Current (Notes 8, 9) I AVDD
Standby mode 305
µA
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.)