MAX1491 Datasheet, PDF(13/25 Page) Maxim Integrated Products – 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

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MAX1491 Datasheet, PDF (13/25 Pages) Maxim Integrated Products – 3.5- and 4.5-Digit, Single-Chip ADCs with LCD Drivers

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3.5- and 4.5-Digit, Single-Chip

ADCs with LCD Drivers

Ï1

Ï2

Ï3

Ï1'

Ï2'

BP1

BP2

BP3

ALL

OFF

a ON

g, d OFF

g ON

a, d OFF

d ON

a, g OFF

FREQUENCY = 107Hz

Ï1, Ï2, Ï3 - - BP HIGH WITH RESPECT TO SEGMENT (BP+ TIME)

Ï1', Ï2', Ï3' - - BP LOW WITH RESPECT TO SEGMENT (BP- TIME)

BP1 ACTIVE DURING Ï1 AND Ï1'

BP2 ACTIVE DURING Ï2 AND Ï2'

BP3 ACTIVE DURING Ï3 AND Ï3'

Figure 9. LCD Voltage WaveformâCombinations 1â4 (BP1/2/3, SEGa/d/g)

Ï3'

V+

VLCD

V-

V+

V-

V+

V-

V+

V-

V+

V-

V+

V-

V+

V-

V+ = DVDD, VH = 2/3 DVDD

VL = 1/3 VLCD, V- = GND

VLCD = DVDD - GND

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