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MAX1494CCJ+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P34
General Description
The MAX1492/MAX1494 low-power, 3.5- and 4.5-digit,
analog-to-digital converters (ADCs) with integrated liquid
crystal display (LCD) drivers operate from a single 2.7V
to 5.25V power supply. They include an internal refer-
ence, a high-accuracy on-chip oscillator, and a triplexed
LCD driver. An internal charge pump generates the neg-
ative supply needed to power the integrated input buffer
for single-supply operation. The ADCs are configurable
for either a ±2V or ±200mV input range and outputs its
conversion results to an LCD and/or to a microcontroller
(µC). µC communication is facilitated through an
SPI™-/QSPI™-/MICROWIRE
®
-compatible serial inter-
face. The MAX1492 is a 3.5-digit (±1999 count) device,
and the MAX1494 is a 4.5-digit (±19,999 count) device.
The MAX1492/MAX1494 do not require external-preci-
sion integrating capacitors, autozero capacitors, crystal
oscillators, charge pumps, or other circuitry required
with dual-slope ADCs (commonly used in panel meter
circuits).
These devices also feature on-chip buffers for the dif-
ferential signal and reference inputs, allowing direct
interface with high-impedance signal sources. In addi-
tion, they use continuous internal-offset calibration and
offer >100dB simultaneous rejection of 50Hz and 60Hz
line noise. Other features include data hold and peak
hold, overrange and underrange detection, and a low-
battery monitor.
The MAX1494 comes in a 32-pin, 7mm x 7mm LQFP
package, and the MAX1492 comes in 28-pin SSOP and
28-pin PDIP packages. All devices in this family operate
over the 0°C to +70°C commercial temperature range.
Applications
Digital Panel Meters
Hand-Held Meters
Digital Voltmeters
Digital Multimeters
Features
o High Resolution
MAX1494: 4.5 Digits (±19,999 Count)
MAX1492: 3.5 Digits (±1999 Count)
o Sigma-Delta ADC Architecture
No Integrating Capacitors Required
No Autozeroing Capacitors Required
>100dB of Simultaneous 50Hz and 60Hz
Rejection
o Operate from a Single 2.7V or 5.25V Supply
o Selectable Input Range of ±200mV or ±2V
o Selectable Voltage Reference: Internal 2.048V
or External
o Internal High-Accuracy Oscillator Needs No
External Components
o Automatic Offset Calibration
o Low Power
Maximum 960µA Operating Current
Maximum 400µA Shutdown Current
o Small 32-Pin 7mm x 7mm LQFP Package
(4.5 Digits), 28-Pin SSOP Package (3.5 Digits)
o Triplexed LCD Driver
o SPI-/QSPI-/MICROWIRE-Compatible Serial
Interface
o Evaluation Kit Available (Order MAX1494EVKIT)
MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
________________________________________________________________
Maxim Integrated Products
1
Ordering Information/
Selector Guide
19-2959; Rev 4; 7/10
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
PART
TEMP
RANGE
PIN-
PACKAGE
RESOLUTION
(DIGITS)
MAX1492CAI+ 0°C to +70°C 28 SSOP 3.5
MAX1492CNI+ 0°C to +70°C 28 PDIP 3.5
MAX1494CCJ+ 0°C to +70°C 32 LQFP 4.5
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
+
Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configurations appear at end of data sheet.
MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
AVDD to GND...........................................................-0.3V to +6V
DVDD to GND...........................................................-0.3V to +6V
AIN+, AIN- to GND ...............................V
NEG
to +(AVDD + 0.3V)
REF+, REF- to GND..............................V
NEG
to +(AVDD + 0.3V)
LOWBATT to GND...................................-0.3V to (AVDD + 0.3V)
CLK, EOC, CS, DIN, SCLK, DOUT to
GND ....................................................-0.3V to (DVDD + 0.3V)
SEG_ and BP_ to GND............................-0.3V to (DVDD + 0.3V)
V
NEG
to GND...........................................-2.6V to (AVDD + 0.3V)
V
DISP
to GND ..........................................-0.3V to (DVDD + 0.3V)
Maximum Current into Any Pin ...........................................50mA
Continuous Power Dissipation (T
A
= +70°C)
28-Pin SSOP (derate 14.9mW/°C above +70°C) ....1192.3mW
28-Pin PDIP (derate 14.3mW/°C above +70°C)......1142.9mW
32-Pin LQFP (derate 20.7mW/°C above +70°C).....1652.9mW
Operating Temperature Range...............................0°C to +70°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
ELECTRICAL CHARACTERISTICS
(V
AVDD
= V
DVDD
= 2.7V to 5.25V, V
GND
= 0V, V
REF+
- V
REF-
= 2.048V (external reference). Internal clock mode, unless otherwise noted.
All specifications are at T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DC ACCURACY
MAX1494 -19,999 +19,999
Noise-Free Resolution
MAX1492 -1999 +1999
Count
2.000V range ±1
Integral Nonlinearity (Note 1) INL
200mV range ±1
Count
Range Change Accuracy
(V
AIN+
- V
AIN-
= 0.100V) on 200mV range,
(V
AIN+
- V
AIN-
= 0.100V) on 2.0V range
10:1 Ratio
Rollover Error (See the Definitions
Section)
V
AIN+
- V
AIN-
= full scale,
V
AIN-
- V
AIN+
= full scale
±1 Count
Output Noise 10 µV
P-P
Offset Error (Zero Input Reading) Offset V
IN
= 0V (Note 2) -0 0 Reading
Gain Error (Note 3) -0.5 +0.5 %FSR
Offset Drift (Zero-Reading Drift) V
IN
= 0V (Note 4) 0.1 µV/°C
Gain Drift ±1 ppm/°C
INPUT CONVERSION RATE
External-Clock Frequency 4.915 MHz
External-Clock Duty Cycle 40 60 %
Internal clock 5
Conversion Rate
External clock, f
CLK
= 4.915MHz 5
Hz
ANALOG INPUTS (AIN+, AIN-, bypass to GND with 0.1µF or greater capacitors)
RANGE bit = 0, ±2V -2.0 +2.0
AIN Input-Voltage Range
(Note 5)
RANGE bit = 1, ±200mV -0.2 +0.2
V
AIN Absolute Input Voltage to
GND
-2.2 +2.2 V
MAX1492/MAX1494
3.5- and 4.5-Digit, Single-Chip ADCs
with LCD Drivers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
AVDD
= V
DVDD
= 2.7V to 5.25V, V
GND
= 0V, V
REF+
- V
REF-
= 2.048V (external reference). Internal clock mode, unless otherwise noted.
All specifications are at T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Internal clock mode, 50Hz and 60Hz ±2% 100
Normal-Mode 50Hz and 60Hz
Rejection (Simultaneously)
External clock mode, 50Hz and 60Hz ±2%,
f
CLK
= 4.915MHz
120
dB
Common-Mode 50Hz and 60Hz
Rejection (Simultaneously)
CMR For 50Hz and 60Hz ±2%, R
SOURCE
< 10kΩ 150 dB
Common-Mode Rejection CMR At DC 100 dB
Input Leakage Current 10 nA
Input Capacitance 10 pF
Dynamic Input Current (Note 6) -20 +20 nA
LOW-BATTERY VOLTAGE MONITOR (LOWBATT)
LOWBATT Trip Threshold 2.048 V
LOWBATT Leakage Current 10 pA
Hysteresis 20 mV
INTERNAL REFERENCE (INTREF BIT = 1, REF- = GND, bypass REF+ to GND with a 4.7µF capacitor)
REF Output Voltage V
REF
V
AVDD
= 5V, T
A
= +25°C 2.007 2.048 2.089 V
REF Output Short-Circuit Current 1mA
REF Output Temperature
Coefficient
TC
VREF
V
AVDD
= 5V 40 ppm/°C
Load Regulation I
SOURCE
= 0 to 300µA, I
SINK
= 0 to 30µA 6 mV/µA
Line Regulation 50 µV/V
0.1Hz to 10Hz 25
Noise Voltage
10Hz to 10kHz 400
µV
P-P
EXTERNAL REFERENCE (INTREF BIT = 0, bypass REF+ and REF- to GND with 0.1µF or larger capacitors)
REF Input Voltage Differential (V
REF+
- V
REF-
) 2.048 V
Absolute REF Input Voltage to
GND
-2.2 +2.2 V
Internal clock mode, 50Hz and 60Hz ±2% 100
Normal-Mode 50Hz and 60Hz
Rejection (Simultaneously)
External clock mode, 50Hz and 60Hz ±2%,
f
CLK
= 4.915MHz
120
dB
Common-Mode 50Hz and 60Hz
Rejection (Simultaneously)
CMR For 50Hz and 60Hz ±2%, R
SOURCE
< 10kΩ 150 dB
Common-Mode Rejection CMR At DC 100 dB
Input Leakage Current 10 nA
Input Capacitance 10 pF
Dynamic Input Current (Note 6) -20 +20 nA
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.
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