MAX1492 Datasheet, PDF (16/35 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'
BP1
BP2
BP3
ALL
OFF
a, d ON
g OFF
a, g ON
d OFF
g, d ON
a OFF
FREQUENCY = 107Hz
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'
φ3'
V+
VH
VLCD
VL
V-
V+
VH
VL
V-
V+
VH
VL
V-
V+
VH
VL
V-
V+
VH
VL
V-
V+
VH
VL
V-
V+
VH
VL
V-
V+ = DVDD, VH = 2/3 DVDD
VL = 1/3 VLCD, V- = GND OR VDISP
VLCD = DVDD - VDISP (MAX1494)
VLCD = DVDD - GND (MAX1492)
Figure 10. LCD Voltage Waveform—Combinations 5–8 (BP_, SEG2/5/8)
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