Rainbow Electronics MAX1494 - Manual (Page 4)

MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(AV DD = DV DD = +2.7V to +5.25V, GND = 0, V REF+ - V REF- = 2.048V (external reference). Internal clock mode, unless otherwise noted.
All specifications are at T A = T MIN to T MAX , unless otherwise noted. Typical values are at T A = +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CHARGE PUMP (C NEG = 0.1µF)
Output Voltage V NEG -2.60 -2.42 -2.30 V
DIGITAL INPUTS (SCLK, DIN, CS, CLK)
Input Current I IN V IN = 0 or DV DD -10 +10 µA
Input Low Voltage V INL
0.3 x
DV DD
V
Input High Voltage V INH 0.7 x DV DD V
Input Hysteresis V HYST DV DD = 3.0V 200 mV
DIGITAL OUTPUTS (DOUT, EOC)
Output Low Voltage V OL I SINK = 1mA 0.4 V
Output High Voltage V OH I SOURCE = 200µA 0.8 x DV DD V
Tri-State Leakage Current I L D OUT only -10 +10 µA
Tri-State Output Capacitance C OUT D OUT only 15 pF
POWER SUPPLY
AV DD Voltage AV DD 2.70 5.25 V
DV DD Voltage DV DD 2.70 5.25 V
Power-Supply Rejection AV DD PSRR A (Note 7) 80 dB
Power-Supply Rejection DV DD PSRR D (Note 7) 100 dB
AV DD = 5V 580 660
AV DD Current (Notes 8, 9) I AVDD
Standby 240 380
µA
DV DD = 5V 260 320
DV
DD
= 3.3V 130 180 DV DD Current (Notes 8, 9) I DVDD
Standby 10 20
µA
LCD DRIVER
MAX1492
1.92 x
DV DD
RMS Segment On Voltage
MAX1494
1.92 x
(DV DD - V DISP )
V
MAX1492
1/3 x
DV DD
RMS Segment Off Voltage
MAX1494
1/3 x
(DV
DD
- V
DISP
)
V
Display Voltage Setup Resistor R DISP MAX1494 only 157.5 k Ω
Display Multiplex Rate 107 Hz
LCD Data-Update Rate 2.5 Hz