3.5- and 4.5-Digit, Single-Chip

ADCs with LCD Drivers

4

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ELECTRICAL CHARACTERISTICS (continued)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

POWER SUPPLY

2.70

5.25

V

2.70

5.25

V

(Note 7)

80

dB

(Note 7)

100

dB

(Note 8)

660

µA

320

180

µA

LCD DRIVER

RMS Segment-On Voltage

1.92 x

V

RMS Segment-Off Voltage

1 / 3 x

V

Display Multiplex Rate

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 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.