Rainbow Electronics MAX1494 - Manual (Page 17)

MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
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φ1 φ2 φ3 φ1' φ2' φ3'
V LCD
-V P
0
V RMS = V LCD / 3 OFF
V P
-V P
0 V RMS = V LCD / 3 OFF
V P
-V P
0 V RMS = 1.92V LCD / 3 ON
V P
-V P
0
V 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 G = V Y - V BP2 (DIFFERENCE BETWEEN SEGMENT LINE Y AND BP2 VOLTAGE)
VOLTAGE CONTRAST RATIO = V RMS ON / V RMSOFF = 1.922V
a ON
g, d OFF
a, g ON
d OFF
ALL
ON
Figure 11. Voltage Waveforms on the g Segment