MAX1455 Datasheet, PDF (1/25 Pages) Maxim Integrated Products – Low-Cost Automotive Sensor Signal Conditioner

19-2088; Rev 1; 10/01
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Low-Cost Automotive Sensor Signal
Conditioner
General Description
The MAX1455 is a highly integrated automotive analog-
sensor signal processor for resistive element sensors.
The MAX1455 provides amplification, calibration, and
temperature compensation that enable an overall per-
formance approaching the inherent repeatability of the
sensor. The fully analog signal path introduces no
quantization noise in the output signal while enabling
digitally controlled trimming with integrated 16-bit digi-
tal-to-analog converters (DACs). Offset and span are
also calibrated using 16-bit DACs, allowing sensor
products to be truly interchangeable.
The MAX1455 architecture includes a programmable
sensor excitation, a 16-step programmable-gain ampli-
fier (PGA), a 768-byte (6144 bits) internal EEPROM,
four 16-bit DACs, an uncommitted op amp, and an on-
chip temperature sensor. In addition to offset and span
compensation, the MAX1455 provides a unique tem-
perature compensation strategy that was developed to
provide a remarkable degree of flexibility while minimiz-
ing testing costs.
The MAX1455 is available in die form, 16-pin SSOP and
TSSOP packages.
Customization
Maxim can customize the MAX1455 for high-volume
dedicated applications. Using our dedicated cell library
of more than 2000 sensor-specific function blocks,
Maxim can quickly provide a modified MAX1455 solu-
tion. Contact Maxim for further information.
Applications
Pressure Sensors and Transducers
Piezoresistive Silicon Sensors
Strain Gauges
Resistive Element Sensors
Accelerometers
Humidity Sensors
MR and GMR Sensors
Ratiometric Voltage Output
Programmable Output Clip Limits
Outputs
A detailed Functional Diagram appears at end of data sheet.
Secure-Lock is a trademark of Maxim Integrated Products, Inc.
Features
o Provides Amplification, Calibration, and
Temperature Compensation
o Selectable Output Clipping Limits
o Accommodates Sensor Output Sensitivities
from 5mV/V to 40mV/V
o Single-Pin Digital Programming
o No External Trim Components Required
o 16-Bit Offset and Span Calibration Resolution
o Fully Analog Signal Path
o PRT Bridge Can Be Used for Temperature-
Correction Input
o On-Chip Lookup Table Supports Multipoint
Calibration Temperature Correction
o Fast 3.2kHz Frequency Response
o On-Chip Uncommitted Op Amp
o Secure-Lock™ Prevents Data Corruption
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX1455EUE* -40°C to +85°C
16 TSSOP
MAX1455AUE* -40°C to +125°C 16 TSSOP
MAX1455EAE -40°C to +85°C
16 SSOP
MAX1455AAE -40°C to +125°C 16 SSOP
MAX1455C/D -40°C to +85°C
Dice**
*Future product—contact factory for availability.
**Dice are tested at T_A = +25°C, DC parameters only.
TOP VIEW
Pin Configuration
TEST1 1
OUT 2
INP 3
BDR 4
INM 5
V_SS 6
V_DD1 7
AMP+ 8
MAX1455
16 TEST2
15 TEST3
14 TEST4
13 DIO
12 UNLOCK
11 V_DD2
10 AMP-
9 AMPOUT
SSOP/TSSOP
________________________________________________________________ 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.