MAX1464 Datasheet, PDF (1/47 Pages) Maxim Integrated Products – Low-Power, Low-Noise Multichannel Sensor Signal Processor

19-3579; Rev 0; 2/05
Low-Power, Low-Noise Multichannel
Sensor Signal Processor
General Description
The MAX1464 is a highly integrated, low-power, low-
noise multichannel sensor signal processor optimized
for industrial, automotive, and process-control applica-
tions such as pressure sensing and compensation,
RTD and thermocouple linearization, weight sensing
and classification, and remote process monitoring with
limit indication.
The MAX1464 accepts sensors with either single-ended
or differential outputs. The MAX1464 accommodates
sensor output sensitivities from 1mV/V to 1V/V. The
MAX1464 provides amplification, calibration, signal lin-
earization, and temperature compensation that enable
an overall performance approaching the inherent
repeatability of the sensor without requiring any exter-
nal trim components.
Two 16-bit voltage-output DACs and two 12-bit PWMs
can be used to indicate each of the temperature-com-
pensated sensor signals independently, as a sum or
difference signal, or user-defined relationship between
each signal and temperature. Uncommitted op amps
are available to buffer the DAC outputs, drive heavier
external loads, or provide additional gain and filtering.
The MAX1464 incorporates a 16-bit CPU, user-pro-
grammable 4kB of FLASH program memory, 128 bytes
of FLASH user information, one 16-bit ADC, two 16-bit
DACs, two 12-bit PWM digital outputs, four rail-to-rail
op amps, one SPI™-compatible interface, two GPIOs,
and one on-chip temperature sensor.
The MAX1464 operates from a single 5.0V (typ) supply
and is packaged for automotive, industrial, and com-
mercial temperature ranges in a 28-pin SSOP package.
Applications
Pressure Sensor Signal Conditioning
Weight Measurement Systems
Thermocouple and RTD Linearization
Transducers and Transmitters
Process Indicators
Calibrators and Controllers
GMR and MR Magnetic Direction Sensors
Functional Diagram and Detailed Block Diagram appear at
end of data sheet.
SPI is a trademark of Motorola, Inc.
Features
♦ Programmable Amplification, Calibration,
Linearization, and Temperature Compensation
♦ Two Differential or Four Single-Ended ADC Input
Channels
♦ Accommodates Sensor Output Sensitivities from
1mV/V to 1V/V
♦ Two DAC/PWM Output Signal Channels
♦ Supports 4–20mA Current Loop Applications
♦ 4kB of FLASH Memory for Code and Coefficients
♦ 128 Bytes of FLASH Memory for User Information
♦ Integrated Temperature Sensing
♦ Flexible Dual Op-Amp Block
♦ Programmable Sensor Input Gain and Offset
♦ Programmable Sensor Sampling Rate and
Resolution
♦ No External Trim Components Required
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX1464CAI
0°C to +70°C
28 SSOP
MAX1464C/W*
0°C to +70°C
Die
MAX1464EAI
-40°C to +85°C
28 SSOP
MAX1464AAI
-40°C to +125°C 28 SSOP
*Dice are tested at T_A = +25°C, DC parameters only.
Pin Configuration
TOP VIEW
OUT1SM 1
AMP1M 2
AMP1P 3
OUT1LG 4
N.C. 5
VDD 6
N.C. 7
CKSEL 8
CKIO 9
CS 10
DO 11
DI 12
SCLK 13
VSS 14
MAX1464
SSOP
28 OUT2SM
27 AMP2M
26 AMP2P
25 OUT2LG
24 VREF
23 INP1
22 INM1
21 INP2
20 INM2
19 VSS
18 VSSF
17 GPIO2
16 GPIO1
15 VDDF
________________________________________________________________ Maxim Integrated Products 1
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.