EVALUATION KIT AVAILABLE MAX1455 Low-Cost Precision Sensor Signal Conditioner General Description Features Provides Amplification, Calibration, and Temperature The MAX1455 is a highly integrated, sensor signal pro- Compensation cessor for resistive element sensors. The MAX1455 pro- vides amplification, calibration, and temperature compen- Selectable Output Clipping Limits sation that enable an overall performance approaching Accommodates Sensor Output Sensitivities the inherent repeatability of the sensor. The fully analog from 5mV/V to 40mV/V signal path introduces no quantization noise in the output Single-Pin Digital Programming signal while enabling digitally controlled trimming with No External Trim Components Required integrated 16-bit digital-to-analog converters (DACs). 16-Bit Offset and Span Calibration Resolution Offset and span are also calibrated using 16-bit DACs, allowing sensor products to be truly interchangeable. Fully Analog Signal Path PRT Bridge Can Be Used for Temperature-Correction The MAX1455 architecture includes a programmable Input sensor excitation, a 16-step programmable-gain amplifier (PGA), a 768-byte (6144 bits) internal EEPROM, four 16-bit On-Chip Lookup Table Supports Multipoint DACs, an uncommitted op amp, and an on-chip tempera- Calibration Temperature Correction ture sensor. In addition to offset and span compensation, Fast 3.2kHz Frequency Response the MAX1455 provides a unique temperature compensa- On-Chip Uncommitted Op Amp tion strategy that was developed to provide a remarkable Secure-Lock Prevents Data Corruption degree of flexibility while minimizing testing costs. The MAX1455 is available in die form, and in 16-pin Ordering Information SSOP and TSSOP packages. PART TEMP. RANGE PIN-PACKAGE MAX1455AAE -40C to +125C 16 SSOP Customization MAX1455AUE* -40C to +125C 16 TSSOP Maxim can customize the MAX1455 for high-volume MAX1455EAE -40C to +85C 16 SSOP dedicated applications. Using our dedicated cell library of more than 2000 sensor-specific function blocks, Maxim MAX1455EUE* -40C to +85C 16 TSSOP can quickly provide a modified MAX1455 solution. Contact MAX1455C/D -40C to +85C Dice** Maxim for further information. *Future ProductContact factory for availability. *Dice are tested at T = +25C, DC parameters only. A Applications Pressure Sensors and Transducers Pin Configuration Piezoresistive Silicon Sensors Strain Gauges TOP VIEW Resistive Element Sensors TEST1 1 16 TEST2 Accelerometers OUT 2 15 TEST3 Humidity Sensors INP 3 14 TEST4 MR and GMR Sensors MAX1455 BDR 4 13 DIO Outputs INM 5 12 UNLOCK Ratiometric Voltage Output V 6 V 11 SS DD2 Programmable Output Clip Limits V 7 10 AMP- DD1 A detailed Functional Diagram appears at end of data sheet. AMP+ 8 9 AMPOUT Secure-Lock is a trademark of Maxim Integrated Products, Inc. SSOP/TSSOP 19-2088 Rev 2 5/14MAX1455 Low-Cost Precision Sensor Signal Conditioner Absolute Maximum Ratings Supply Voltage, V to V ..................................... -0.3V, +6V Operating Temperature Ranges (T to T ) DD SS MIN MAX V - V ............................................................ -0.3V, +0.6V MAX1455C/D .................................................. -40C to +85C DD1 DD2 All Other Pins .............................. (V - 0.3V) to (V + 0.3V) MAX1455EAE ................................................. -40C to +85C SS DD Short-Circuit Duration, OUT, BDR, AMPOUT ............Continuous MAX1455AAE ............................................... -40C to +125C Continuous Power Dissipation (T = +70C) MAX1455EUE................................................. -40C to +85C A 16-Pin SSOP (derate 8.00mW/C above +70C) ........640mW MAX1455AUE............................................... -40C to +125C Storage Temperature Range ............................ -65C to +150C Lead Temperature (soldering, 10s) ................................ +300C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation 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. Electrical Characteristics (V = +5V, V = 0V, T = +25C, unless otherwise noted.) DD SS A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS GENERAL CHARACTERISTICS Supply Voltage V 4.5 5.0 5.5 V DD Supply Current I I + I (Note 1) 3.0 6.0 mA DD DD1 DD2 Oscillator Frequency f 0.85 1 1.15 MHz OSC ANALOG INPUT Input Impedance R 1 M IN Input-Referred Adjustable Offset Offset TC = 0 (Note 2), minimum gain 150 mV Range Input-Referred Offset Tempco T = T to T 1 V/C A MIN MAX Amplifier Gain Nonlinearity 0.025 % Specified for common-mode voltages Common-Mode Rejection Ratio CMRR 90 dB between V and V SS DD Minimum Input-Referred FSO (Note 3) 7 mV/V Range Maximum Input-Referred FSO (Note 3) 40 mV/V Range ANALOG OUTPUT Minimum Differential Signal-Gain PGA 3:0 = 0000 39 V/V Range Maximum Differential Signal- PGA 3:0 = 1111 234 V/V Gain Range Low 0.10 Clip 1:0 = 00 High 4.90 Low 0.15 Clip 1:0 = 01 High 4.85 No load, Output Clip Voltage Settings V V OUT T = T to T A MIN MAX Low 0.20 Clip 1:0 = 10 High 4.80 Low 0.25 Clip 1:0 = 11 High 4.75 V = +0.5V to +4.5V, T = T to T , OUT A MIN MAX Load Current Source 1 mA Clip 1:0 = 00 Maxim Integrated 2 www.maximintegrated.com