Rainbow Electronics MAX1464 - Manual

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
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
MAX1464
Low-Power, Low-Noise Multichannel
Sensor Signal Processor
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
19-3579; Rev 0; 2/05
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.
*Dice are tested at T A = +25°C, DC parameters only.
Functional Diagram and Detailed Block Diagram appear at
end of data sheet.
SPI is a trademark of Motorola, Inc.
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
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
OUT2SM
AMP2M
AMP2P
OUT2LG
V REF
INP1
V DDF
INM1
INP2
INM2
V SS
V SSF
GPIO2
GPIO1
V SS
SCLK
DI
DO
CS
CKIO
CKSEL
N.C.
V DD
N.C.
OUT1LG
AMP1P
AMP1M
OUT1SM
SSOP
TOP VIEW
MAX1464
Pin Configuration