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MAX1494CCJ+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
16 ______________________________________________________________________________________
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+ = V
DVDD
, V
H
= 2/3 V
DVDD
V
L
= 1/3 V
LCD
, V- = GND OR V
DISP
V
LCD
= V
DVDD
- V
DISP
(MAX1494)
V
LCD
= V
DVDD
- V
GND
(MAX1492)
Figure 10. LCD Voltage Waveform—Combinations 5–8 (BP_, SEG2/5/8)
MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
______________________________________________________________________________________ 17
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
RMSON
/ V
RMSOFF
= 1.922V
a ON
g, d OFF
a, g ON
d OFF
ALL
ON
Figure 11. Voltage Waveforms on the g Segment
MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
18 ______________________________________________________________________________________
012345
APPLIED VOLTAGE (V
RMS
)
0
10
20
30
40
50
60
70
80
90
100
CONTRAST (%)
T
A
= +25°C
V
ON
= 2.1V
RMS
Ø = -10°
Ø = 0°
Ø = +10°
Ø = -30°
V
OFF
=
1.1V
RMS
Ø+
Ø-
Figure 12. Contrast vs. Applied RMS Voltage
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34

MAX1494CCJ+

Mfr. #:
Buy MAX1494CCJ+
Manufacturer:
Maxim Integrated
Description:
LCD Drivers 4.5 Digit ADC w/LCD Drivers
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
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