Manual

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
kΩ
Display Multiplex Rate
107
Hz
LCD Data-Update Rate 2.5 Hz