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MAX1491CAI+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
MAX1491/MAX1493/MAX1495
3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
______________________________________________________________________________________ 13
φ1 φ2 φ3 φ1' φ2' φ3'
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V
LCD
BP1
BP2
BP3
ALL
OFF
a ON
g, d OFF
g ON
a, d OFF
d ON
a, g 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'
V+ = DV
DD
, V
H
= 2/3 DV
DD
V
L
= 1/3 V
LCD
, V- = GND
V
LCD
= DV
DD
- GND
Figure 9. LCD Voltage Waveform—Combinations 1–4 (BP1/2/3, SEGa/d/g)
MAX1491/MAX1493/MAX1495
3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
14 ______________________________________________________________________________________
φ1 φ2 φ3 φ1' φ2' φ3'
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V+
V
H
V
L
V-
V
LCD
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'
V+ = DV
DD
, V
H
= 2/3 DV
DD
V
L
= 1/3 V
LCD
, V- = GND
V
LCD
= DV
DD
- GND
Figure 10. LCD Voltage Waveform—Combinations 5–8 (BP1/2/3, SEGa/d/g)
MAX1491/MAX1493/MAX1495
3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
______________________________________________________________________________________ 15
φ1 φ2 φ3 φ1' φ2' φ3'
V
LCD
-V
LCD
0
V
RMS
= V
LCD
/ 3 (OFF)
V
LCD
-V
LCD
0
V
RMS
= V
LCD
/ 3 (OFF)
V
LCD
-V
LCD
0
V
RMS
= 1.92V
LCD
/ 3 (ON)
V
LCD
-V
LCD
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
= 1.922
a ON
g, d OFF
a, g ON
d OFF
ALL
ON
Figure 11. Voltage Waveforms on the g Segment
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

MAX1491CAI+T

Mfr. #:
Buy MAX1491CAI+T
Manufacturer:
Maxim Integrated
Description:
LCD Drivers 3.5 Digit ADC w/LCD Drivers
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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