19-2088; Rev 1; 10/01
Low-Cost Automotive Sensor Signal
Conditioner
General Description
Features
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.
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
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.
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
The MAX1455 is available in die form, 16-pin SSOP and
TSSOP packages.
o Secure-Lock™ Prevents Data Corruption
Customization
Ordering Information
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.
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +125°C
-40°C to +85°C
-40°C to +125°C
-40°C to +85°C
PIN-PACKAGE
16 TSSOP
16 TSSOP
16 SSOP
MAX1455EUE*
MAX1455AUE*
MAX1455EAE
MAX1455AAE
MAX1455C/D
16 SSOP
Dice**
Applications
Pressure Sensors and Transducers
Piezoresistive Silicon Sensors
Strain Gauges
*Future product—contact factory for availability.
**Dice are tested at T = +25°C, DC parameters only.
A
Resistive Element Sensors
Accelerometers
Humidity Sensors
Pin Configuration
TOP VIEW
MR and GMR Sensors
TEST1
OUT
INP
1
2
3
4
5
6
7
8
16 TEST2
15 TEST3
14 TEST4
13 DIO
Outputs
Ratiometric Voltage Output
Programmable Output Clip Limits
BDR
INM
MAX1455
12 UNLOCK
V
11
10 AMP-
AMPOUT
V
SS
DD2
V
DD1
A detailed Functional Diagram appears at end of data sheet.
AMP+
9
Secure-Lock is a trademark of Maxim Integrated Products, Inc.
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.