MAX1491 Datasheet, PDF (4/25 Pages) Maxim Integrated Products – 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
ELECTRICAL CHARACTERISTICS (continued)
(AV_DD = DV_DD = +2.7V to +5.25V, GND = 0, V_REF+ - V_REF- = 2.048V (external reference), C_NEG= 0.1µF. All specifications are T_MIN
to T_MAX, unless otherwise noted. Typical values are at +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX UNITS
POWER SUPPLY
AV_DD Voltage
DV_DD Voltage
Power-Supply Rejection AV_DD
Power-Supply Rejection DV_DD
AV_DD Current
DV_DD Current
LCD DRIVER
AV_DD
DV_DD
PSRR_A
PSRR_D
I_AVDD
I_DVDD
(Note 7)
(Note 7)
(Note 8)
DV_DD = 5V
DV_DD = 3.3V
2.70
5.25
V
2.70
5.25
V
80
dB
100
dB
660
µA
320
µA
180
RMS Segment-On Voltage
1.92 x
DV_DD
V
RMS Segment-Off Voltage
Display Multiplex Rate
1/3x
V
DV_DD
107
Hz
LCD Data-Update Rate
2.5
Hz
Note 1: Integral nonlinearity is the derivation of the analog values at any code from its theoretical value after nulling the gain error
and offset error.
Note 2: Offset calibrated.
Note 3: Offset nulled.
Note 4: The input voltage range for the analog inputs is given with respect to the voltage on the negative input of the differential pair.
Note 5: For the range of V_AIN+ or V_AIN- = -2.2V to +2.2V and V_REF+ or V_REF- = -2.2V to +2.2V.
Note 6: External load must be constant during conversion for specified accuracy. Guaranteed specification of 2mV/mA is a result of
production test limitations.
Note 7: Measured at DC by changing the power-supply voltage from 2.7V to 5.25V and measuring its effect on the conversion error.
PSRR at 50Hz and 60Hz exceeds 120dB with filter notches of 10, 20, 30, 40, 50, or 60 Hz.
Note 8: Analog power-supply currents are measured with all digital inputs at either GND or DV_DD. Digital power-supply currents
measured with all digital inputs at either GND or DV_DD.
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