19-1813; Rev 0; 10/00
Low-Voltage, Low-Power,
16-Bit Smart ADC
General Description
Features
ꢀ Low-Voltage Operation (2.4V to 3.6V)
The MAX1462 implements a revolutionary concept in
signal conditioning, where the output of its 16-bit ana-
log-to-digital converter (ADC) is digitally corrected over
the specified temperature range. This feature can be
readily exploited by automotive, industrial, and medical
market segments, in applications such as sensors and
smart batteries. Digital correction is provided by an
internal digital signal processor (DSP) and on-chip 128-
bit EEPROM containing user-programmed calibration
coefficients. The conditioned output is available as a
12-bit digital word and as a ratiometric (proportional to
the supply voltage) analog voltage using an on-board
12-bit digital-to-analog converter (DAC). The uncommit-
ted op amp can be used to filter the analog output.
ꢀ Low-Noise, 310µA Single-Chip Sensor Signal
Conditioning
ꢀ High-Precision Front End Resolves <400nV of
Differential Input Signal
ꢀ On-Chip DSP and EEPROM Provide Digital
Correction of Sensor Errors
ꢀ 16-Bit Signal Path Compensates Sensor Offset
and Sensitivity and Associated Temperature
Coefficients
ꢀ 12-Bit Parallel Digital Output
ꢀ Analog Output
The analog front end includes a 2-bit programmable-
gain amplifier (PGA) and a 3-bit coarse-offset (CO)
DAC, which condition the sensor’s output. This coarsely
corrected signal is digitized by a 16-bit ADC. The DSP
uses the digitized sensor signal, the temperature sen-
sor, and correction coefficients stored in the internal
EEPROM to produce the conditioned output.
ꢀ Compensates a Wide Range of Sensor Sensitivity
and Offset
ꢀ Single-Shot Automated Compensation
Algorithm—No Iteration Required
ꢀ Built-In Temperature Sensor
ꢀ Three-State, 5-Wire Serial Interface Supports
Multiple or batch manufacturing of sensors is support-
ed with a completely digital test interface. Built-in testa-
bility features on the MAX1462 result in the integration
of three traditional sensor-manufacturing operations
into one automated process:
High-Volume Manufacturing
________________________Applications
Hand-Held Instruments
Piezoresistive Pressure and Acceleration
Transducers and Transmitters
• Pretest: Data acquisition of sensor performance
under the control of a host test computer.
• Calibration and compensation: Computation and
storage of calibration and compensation coefficients
determined from transducer pretest data.
• Final test operation: Verification of transducer cali-
bration and compensation, without removal from the
pretest socket.
The MAX1462 evaluation kit (EV kit) allows fast evalua-
tion and prototyping, using a piezoresistive transducer
(PRT) and a Windows®-based PC. The user-friendly EV
kit simplifies small-volume prototyping; it is not necessary
to understand fully the test-system interface, the calibra-
tion algorithm, or many other details to evaluate the
MAX1462 with a particular sensor. Plug the PRT into the
EV kit, plug the EV kit into a PC parallel port, connect the
sensor to an excitation source (such as a pressure con-
troller), and run the MAX1462 EV kit software. An oven is
required for thermal compensation.
Industrial Pressure Sensors and Calibrators
Smart Battery Charge Systems
Weigh Scales and Strain-Gauge Measurement
Flow Meters
Dive Computers and Liquid-Level Sensing
Hydraulic Systems
Automotive Systems
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
MAX1462CCM
0°C to +70°C
48 TQFP
Customization
Maxim can customize the MAX1462 for unique require-
ments. With a dedicated cell library of more than 90 sen-
sor-specific functional blocks, Maxim can quickly provide
customized MAX1462 solutions, including customized
microcode for unusual sensor characteristics and 2.2V
operation. Contact Maxim for further information.
Functional Diagram appears at end of data sheet.
Pin Configuration appears at end of data sheet.
Windows is a registered trademark of Microsoft Corp.
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
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