EVALUATION KIT AVAILABLE 19-5945 Rev 0 6/11 MAX1454 Precision Sensor Signal Conditioner with Overvoltage Protection General Description Benefits and Features The MAX1454 is a highly integrated analog sensor S Complete Signal Conditioning in a Single IC signal conditioner targeted for automotive applications. Package The device provides amplification, calibration, and tem- Provides Amplification, Calibration, and perature compensation to enable an overall performance Temperature Compensation approaching the inherent repeatability of the sensor. The Accommodates Sensor Output Sensitivities fully analog signal path introduces no quantization noise from 1mV/V to 200mV/V in the output signal while enabling digitally controlled Overvoltage Protection to 45V trimming of the output. Offset and span are calibrated Reverse-Voltage Protection to 45V with integrated 16-bit DACs, allowing sensors to be truly S High-Precision Compensation Reduces interchangeable. Downstream Circuit Complexity The device architecture includes a programmable sen- Fully Analog Signal Path sor excitation, a 32-step programmable-gain amplifier 16-Bit Offset and Span-Calibration Resolution On-Chip Lookup Table Supports Multipoint (PGA), a 2K x 8 bits internal flash memory, four 16-bit DACs, and an on-chip temperature sensor. In addition Calibration Temperature Correction to offset and span compensation, the device provides a S Supports Both Current and Voltage-Bridge unique temperature-compensation method for offset TC Excitation and FSO TC to provide a remarkable degree of flexibility S Fast 85s Step Response while minimizing manufacturing costs. S Sensor Fault Detection The device is packaged in a 16-pin TSSOP and covers S Simple PCB Layout the automotive AEC-Q100 Grade 1 temperature range of -40NC to +125NC. S Single-Pin Digital Programming S No External Trim Components Required Applications Pressure Sensors Strain Gauges Pressure Calibrators and Controllers Ordering Information appears at end of data sheet. Resistive Element Sensors For related parts and recommended products to use with this part, refer to www.maxim-ic.com/MAX1454.related. Humidity Sensors For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com.MAX1454 Precision Sensor Signal Conditioner with Overvoltage Protection ABSOLUTE MAXIMUM RATINGS (Voltages referenced to GND.) Operating Temperature Range ........................ -40NC to +125NC Junction Temperature .....................................................+150NC V , V ............................................................-0.3V to +3.0V DD DDF Storage Temperature Range ............................ -65NC to +150NC V .......................................................................-45V to +45V DDX Lead Temperature (soldering, 10s) .............................. +300NC All Other Pins ............................. -0.3V to Min (V + 0.3V, 6V) DDX Soldering Temperature (reflow) ......................................+260NC Continuous Power Dissipation (T = +70NC) A 16-Pin TSSOP (derate 11.1mW/NC above +70NC) ...888.9mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional opera- tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. PACKAGE THERMAL CHARACTERISTICS (Note 1) TSSOP Junction-to-Ambient Thermal Resistance (q ) ..........90NC/W JA Junction-to-Case Thermal Resistance (q ) ...............27NC/W JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four- layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (V = 5V, V = 0V, T = +25NC, unless otherwise noted.) (Note 2) DDX GND A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL CHARACTERISTICS External Supply Voltage V 3.0 5.0 5.5 V DDX External Supply Current I (Note 3) 2.5 3 mA DDX Oscillator Frequency f 0.85 1 1.15 MHz OSC Not to be loaded by external circuitry, must LDO Regulator Output Voltage V 2.375 2.5 2.625 V DD be connected to a 0.1FF capacitor to GND Power-On-Reset Threshold V Referred to V pin 2.4 V POR DDX External Supply Voltage-Ramp (Note 4) 1 V/ms Rate ANALOG INPUT Input Impedance R 1 MI IN Input-Referred Offset- (Notes 5, 6) Q1 FV/NC Temperature Coefficient Input-Referred Adjustable- Offset TC = 0 at gain = 44 (Note 7) -150 +150 mV Offset Range Percent of 4V span, no load, IRO 3:0 = 0000bin, source impedance = 5kI, V OUT Nonlinearity of Signal Path 0.01 % = 0.5V to 4.5V measured at V = 0.5V, OUT 2.5V, 4.5V at a gain of 112 Common-Mode Rejection Specified for common-mode voltages CMRR 90 dB Ratio between GND and V DDX Input-Referred Adjustable FSO (Note 8) 1 200 mV/V Maxim Integrated 2