MAX1494CCJ+ Maxim Integrated Products, MAX1494CCJ+ Datasheet - Page 14

• Manufacturer Part Number: MAX1494CCJ+
• Description: IC ADC 4.5 DGT LCD DVR 32-TQFP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1494CCJ+

• Display Type: LCD
• Configuration: 7 Segment + 2 Annunciators
• Interface: Serial
• Digits Or Characters: A/D 4.5 Digits
• Current - Supply: 960µA
• Voltage - Supply: 2.7 V ~ 5.25 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 32-LQFP
• Maximum Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX1492/MAX1494 allow for full decimal-point con-
trol and feature leading zero suppression. Use the
DP_EN, DPSET1, and DPSET2 bits in the control register
to set the value of the decimal point. Tables 2 and 3 show
the truth tables of the DP_EN, DPSET1, and DPSET2. The
truth tables determine decimal-point usage.
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
Table 2. Decimal-Point Control Table (MAX1494)
Table 3. Decimal-Point Control Table (MAX1492)
X = Don’t care.
Table 4. LCD During Overrange and
Underrange Conditions
Figure 8. Schematic of Display Digit
14
DP_EN
DP_EN
UNDERRANGE
OVERRANGE
CONDITION
______________________________________________________________________________________
X
X
X
X
0
0
0
0
1
1
1
1
DPSET1
BP1
BP2
BP3
DPSET1
0
0
1
1
0
0
1
1
0
0
1
1
DP
e
f
X
MAX1492
-1– – –
1– – –
Y
DPSET2
a
g
d
DPSET2
0
1
0
1
0
1
0
1
0
1
0
1
Z
b
c
DP
MAX1494
-1– – – –
1– – – –
DISPLAY OUTPUT
DISPLAY OUTPUT
1 8 8 8 8
1 8 8 8 8
1 8 8 8 8
1 8 8 8 8
1 8 8 8.8
1 8 8.8 8
1 8.8 8 8
1.8 8 8 8
1 8 8.8
1 8.8 8
1.8 8 8
1 8 8 8
The MAX1492/MAX1494 overrange and underrange
display is shown in Table 4.
The MAX1492/MAX1494 reference sets the full-scale
range of the ADC transfer function. With a nominal
2.048V reference, the ADC full-scale range is ±2V with
the RANGE bit equal to 0. With the RANGE bit set to 1,
the full-scale range is ±200mV. A decreased reference
voltage decreases full-scale range (see the Transfer
Functions section).
The MAX1492/MAX1494 accept either an external ref-
erence or an internal reference. The INTREF bit selects
the reference mode (see the Control Register
(Read/Write) section).
For internal-reference operation, set INTREF to 1, con-
nect REF- to GND and bypass REF+ to GND with a
4.7µF capacitor. The internal reference provides a nom-
inal 2.048V source between REF+ and GND. The inter-
nal-reference temperature coefficient is typically
40ppm/°C.
The default power-on state sets the MAX1492/
MAX1494 to use the external reference with INTREF
cleared to 0. The external reference inputs, REF+ and
REF-, are fully differential. For a valid external-reference
input, V
and REF- with a 0.1µF or greater capacitor to GND in
external-reference mode.
REF+
must be greater than V
ZERO INPUT READING
ZERO INPUT READING
0.0000
0.000
0.000
0.00
0.00
000
0.0
0.0
REF-
0
0
0
0
. Bypass REF+
Reference