MAX1491 Datasheet, PDF (15/25 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
φ1
φ2
φ3
φ1'
φ2'
φ3'
ALL
OFF
a ON
g, d OFF
V_LCD
0 ^{VRMS = VLCD / 3 (OFF)}
-V_LCD
V_LCD
0 ^{VRMS = VLCD / 3 (OFF)}
a, g ON
d OFF
-V_LCD
V_LCD
0 ^{VRMS = 1.92VLCD / 3 (ON)}
-V_LCD
V_LCD
ALL
ON
0 ^{VRMS = 1.92VLCD / 3 (ON)}
V_G = V_Y - V_BP2 (DIFFERENCE BETWEEN SEGMENT LINE Y AND BP2 VOLTAGE)
VOLTAGE CONTRAST RATIO = V_RMS ON / V_RMSOFF = 1.922
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'
Figure 11. Voltage Waveforms on the g Segment
-V_LCD
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