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PDF MAX1460 Data sheet ( Hoja de datos )
| Número de pieza | MAX1460 | |
| Descripción | Low-Power / 16-Bit Smart ADC | |
| Fabricantes | Maxim Integrated | |
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MAX1460
EVALUATION KIT AVAILABLE
Low-Power, 16-Bit Smart ADC
General Description
The MAX1460 implements a revolutionary concept in signal
conditioning, where the output of its 16-bit analog- to-digital
converter (ADC) is digitally corrected over the specified
temperature range. This feature can be readily exploited
by 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 uncommitted
op amp can be used to filter the analog output, or imple-
ment a 2-wire, 4–20mA transmitter.
The analog front end includes a 2-bit programmablegain
amplifier (PGA) and a 3-bit coarse-offset (CO) DAC,
which condition the sensor’s output. This coarsely cor-
rected signal is digitized by a 16-bit ADC. The DSP uses
the digitized sensor signal, the temperature sensor, and
correction coefficients stored in the internal EEPROM to
produce the conditioned output.
Multiple or batch manufacturing of sensors is supported with a
completely digital test interface. Built-in testability features on
the MAX1460 result in the integration of three traditional sen-
sor-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 stor-
age 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 evaluation
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 under-
stand the test-system interface, the calibration 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, connect the sensor to an excitation
source (such as a pressure 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
●● Low-Noise, 400μA Single-Chip Sensor Signal
Conditioning
●● High-Precision Front End Resolves Less than 1μV 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
●● 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
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
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX1460CCM
0°C to +70°C
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.
19-4784; Rev 1; 5/14
1 page  
MAX1460
Low-Power, 16-Bit Smart ADC
Pin Description (continued)
PIN NAME
FUNCTION
27 D3 Parallel Digital Output - bit 3
28 D4 Parallel Digital Output - bit 4
28 D5 Parallel Digital Output - bit 5
30
OUT
Output DAC. The bitstream on OUT, when externally filtered, creates a ratiometric analog output
voltage. OUT is proportional to the 12-bit parallel digital output.
33 AMPOUT General-Purpose Operational Amplifier Output
34 AMP+ Noninverting Input of General-Purpose Operational Amplifier
35 AMP- Inverting Input of General-Purpose Operational Amplifier
39
XOUT
Internal Oscillator Output. Connect a 2MHz ceramic resonator (Murata CST200) or crystal from XOUT
to XIN.
40
XIN
Internal Oscillator Input. When TEST is high, this pin must be driven by the test system with a 2MHz,
50% duty cycle clock signal. The resonator does not need to be disconnected in test mode.
46 INP Positive Sensor Input. Input impedance is typically > 1MΩ. Rail-to-Rail® input range.
47
TEST
Test/Program Mode Enable Input. When high, enables the MAX1460 programming/testing operations.
Internally pulled to VSS with a 1MΩ (typical) resistor.
48 INM Negative Sensor Input. Input impedance is typically > 1MΩ. Rail-to-rail input range.
Rail-to-Rail is a registered trademark of Nippon Motorola, Ltd.
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX1460
Low-Power, 16-Bit Smart ADC
Table 6. Configuration Register Bitmap
EEPROM
ADDRESS
(HEX)
01
02
03
04
05
06
07
08
09
0A
0B
0C
0D
0E
0F
10
BIT
POSITION
DESCRIPTION
0 (LSB)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15 (MSB)
CO-0 (LSB)
CO-1 (MSB)
CO-S (Sign)
PGA-1 (MSB)
PGA-0 (LSB)
Maxim Reserved
Maxim Reserved
Op Amp Power-Down
Maxim Reserved
TSO-0 (LSB)
TSO-1
TSO-2 (MSB)
Maxim Reserved
Maxim Reserved
Maxim Reserved
Repeat Mode
Writing to the Internal EEPROM
The test system writes to the EEPROM with commands
4 hex (Block-Erase the entire EEPROM), 2 hex (Write
“1” to a single EEPROM bit) and 0 hex (NOOP). During
normal operation (when the TEST pin is low) or when
the test system issues instructions A hex or E hex (Start
conversion from EEPROM values), the DSP reads the
Calibration Coefficients from the EEPROM.
In the normal production flow, determine the calibra-
tion coefficients using direct register access. Then load
the calibration coefficients into the EEPROM with tester
instruction 2 hex. Instruction 4 hex block-erases the
EEPROM and is necessary only for a rework or reclaim
operation. For each part, the Maxim reserved bits in the
Configuration Register should be read before instruction
4 hex is issued, and restored afterwards. The MAX1460
is shipped with its internal EEPROM uninitialized, except
for the reserved bits.
The internal 128-bit EEPROM is arranged as eight 16- bit
words. These eight words are the configuration register
and the seven calibration-coefficient values (Table 7).
The MAX1460 EEPROM is bit addressable. The final cali-
bration coefficients must be mapped into the EEPROM
locations that are to be set. There is no bitclear instruc-
tion. Any EEPROM write operation is necessarily long
because the internal charge pump must create and main-
tain voltages above 20V long enough to cause a reliably
permanent change in the memory.
Writing an EEPROM bit requires 6ms, so writing the
EEPROM typically requires less than 400ms. Do not
decrease the EEPROM write times.
To write an EEPROM bit, the test system must be compli-
ant with the Command Timing Diagram shown in Figure
3, performing the following operations:
1) Issue command 0 hex, including the EEPROM address
field of the bit to be written.
2) Issue command 2 hex, with the address field used in
step 1. Continuously repeat this command 375 times
(6ms).
3) Issue command 0 hex, including the EEPROM address
field used in steps 1 and 2.
The procedure for using command 4 hex (Block-Erase
the EEPROM) is similar. Record the Maxim Reserved bits
in the configuration register prior to using this command,
and restore them afterwards. The number of Block-Erase
operations should not exceed 100.
1) Issue command 0 hex.
2) Issue command 4 hex. Continuously repeat this com-
mand 375 times (6ms).
3) Issue command 0 hex.
Test System Interface:
Observing the DSP Operation
Test system commands 8 hex and A hex initiate a conver-
sion while allowing the test system to observe the opera-
tion of the DSP. To calibrate a unit, the test system must
know the digitized temperature and sensor signals, stored
in DSP registers 8 and 9, and the calibrated and compen-
sated output stored in DSP register 10. The test system
should also verify the EEPROM contents, registers 0–7.
All these signals pass through DSP register S during the
execution of the instruction ROM microcode. The SDO pin
outputs the S register values, and the SDIO pin tells the
tester which signal is currently on S.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MAX1460.PDF ] | |
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