Rainbow-electronics MAX1495 Manual de usuario descargar pdf (Pagina 15)

MAX1491/MAX1493/MAX1495

3.5- and 4.5-Digit, Single-Chip

ADCs with LCD Drivers

______________________________________________________________________________________ 15

φ1 φ2 φ3 φ1' φ2' φ3'

LCD

-V

LCD

RMS

= V

LCD

/ 3 (OFF)

LCD

-V

LCD

RMS

= V

LCD

/ 3 (OFF)

LCD

-V

LCD

RMS

= 1.92V

LCD

/ 3 (ON)

LCD

-V

LCD

RMS

= 1.92V

LCD

/ 3 (ON)

ALL

OFF

φ1, φ2, φ3 - - BP HIGH WITH RESPECT TO SEGMENT (BP+ TIME)

φ1', φ2', φ3' - - BP LOW WITH RESPECT TO SEGMENT (BP- TIME)

BP1 ACTIVE DURING φ1 AND φ1'

BP2 ACTIVE DURING φ2 AND φ2'

BP3 ACTIVE DURING φ3 AND φ3'

= V

- V

BP2

(DIFFERENCE BETWEEN SEGMENT LINE Y AND BP2 VOLTAGE)

VOLTAGE CONTRAST RATIO = V

RMS

ON / V

RMSOFF

= 1.922

a ON

g, d OFF

a, g ON

d OFF

ALL

Figure 11. Voltage Waveforms on the g Segment

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 24 25

MAX1491/MAX1493/MAX1495 1
ADCs with LCD Drivers 1

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Rainbow-electronics MAX1495 Manual de usuario Pagina 15

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