MAX1492 Datasheet, PDF (9/35 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
PIN
MAX1492 MAX1494
24
21
25
25
26
26
27
27
28
29
—
22
—
23
—
24
—
28
Pin Description (continued)
NAME
SEG10
BP3
BP2
BP1
V_NEG
SEG11
SEG12
SEG13
V_DISP
FUNCTION
LCD Segment 10 Driver
LCD Backplane 3 Driver
LCD Backplane 2 Driver
LCD Backplane 1 Driver
-2.42V Charge-Pump Output. Bypass V_NEG to GND with a 0.1µF capacitor.
LCD Segment 11 Driver
LCD Segment 12 Driver
LCD Segment 13 Driver
Temperature-Compensation Voltage Input for LCD. If not using temperature
compensation, connect V_DISP to GND. See the V_DISP LCD Compensation section.
AV_DD DV_DD
SCLK DIN DOUT CS
MAX1494
+2.5V
SERIAL I/O AND CONTROL
AIN+
AIN-
INPUT
BUFFERS
REF+
BINARY-TO-BCD
ADC
CONVERTERS
AND
LCD DRIVERS
REF-
OSCILLATOR/
CLOCK
-2.5V
+2.5V
-2.5V
2.048V
BANDGAP
REFERENCE
A = 1.22
CHARGE
PUMP
EOC
SEG1
SEG13
BP1
BP2
BP3
TO
CONTROL
V_DISP
CLK
GND
V_NEG
LOWBATT
Figure 1. MAX1494 Functional Diagram
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