Manual

MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
_______________________________________________________________________________________ 9
Pin Description (continued)
PIN
MAX1492
MAX1494
NAME
FUNCTION
24 21 SEG10 LCD Segment 10 Driver
25 25 BP3 LCD Backplane 3 Driver
26 26 BP2 LCD Backplane 2 Driver
27 27 BP1 LCD Backplane 1 Driver
28 29 V
NEG
-2.42V Charge-Pump Output. Bypass V
NEG
to GND with a 0.1µF capacitor.
— 22 SEG11 LCD Segment 11 Driver
— 23 SEG12 LCD Segment 12 Driver
— 24 SEG13 LCD Segment 13 Driver
— 28 V
DISP
Temperature-Compensation Voltage Input for LCD. If not using temperature
compensation, connect V
DISP
to GND. See the V
DISP
LCD Compensation section.
MAX1494
BINARY-TO-BCD
CONVERTERS
AND
LCD DRIVERS
ADC
INPUT
BUFFERS
-2.5V
AIN+
AIN-
REF+
REF-
+2.5V
AV
DD
DV
DD
V
DISP
2.048V
BANDGAP
REFERENCE
OSCILLATOR/
CLOCK
SCLK DIN DOUT
EOC
SEG1
SEG13
BP1
BP2
BP3
CLK
CS
SERIAL I/O AND CONTROL
+2.5V
GND
A = 1.22
TO
CONTROL
CHARGE
PUMP
-2.5V
LOWBATTV
NEG
Figure 1. MAX1494 Functional Diagram