MAX1460 Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Low-Power, 16-Bit Smart ADC

19-4784; Rev 0; 10/99
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Low-Power, 16-Bit Smart ADC
General Description
The MAX1460 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, or
implement a 2-wire, 4–20mA transmitter.
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.
Multiple or batch manufacturing of sensors is support-
ed with a completely digital test interface. Built-in testa-
bility features on the MAX1460 result in the integration
of three traditional sensor-manufacturing operations
into one automated process:
• 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 MAX1460 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 fully understand the test-system interface, the calibra-
tion algorithm, or many other details to evaluate the
MAX1460 with a particular sensor. Simply plug the PRT
into the EV kit, plug the EV kit into a PC parallel port, con-
nect the sensor to an excitation source (such as a pres-
sure controller), and run the MAX1460 EV kit software.
An oven is required for thermal compensation.
Functional Diagram appears at end of data sheet.
Pin Configuration appears at end of data sheet.
Windows is a registered trademark of Microsoft Corp.
Features
o Low-Noise, 400µA Single-Chip Sensor Signal
Conditioning
o High-Precision Front End Resolves Less than 1µV
of Differential Input Signal
o On-Chip DSP and EEPROM Provide Digital
Correction of Sensor Errors
o 16-Bit Signal Path Compensates Sensor Offset
and Sensitivity and Associated Temperature
Coefficients
o 12-Bit Parallel Digital Output
o Analog Output
o Compensates a Wide Range of Sensor Sensitivity
and Offset
o Single-Shot Automated Compensation
Algorithm—No Iteration Required
o Built-In Temperature Sensor
o Three-State, 5-Wire Serial Interface Supports
High-Volume Manufacturing
________________________Applications
Hand-Held Instruments
Piezoresistive Pressure and Acceleration
Transducers and Transmitters
Industrial Pressure Sensors and 4–20mA
Transmitters
Smart Battery Charge Systems
Weigh Scales and Strain-Gauge Measurement
Flow Meters
Dive Computers and Liquid-Level Sensing
Hydraulic Systems
Automotive Systems
PART
MAX1460CCM
Ordering Information
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
48 TQFP
Customization
Maxim can customize the MAX1460 for unique require-
ments. With a dedicated cell library of more than 90 sen-
sor-specific functional blocks, Maxim can quickly provide
customized MAX1460 solutions, including customized
microcode for unusual sensor characteristics. Contact
Maxim for further information.
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