EVALUATION KIT AVAILABLE MAX1464 Low-Power, Low-Noise Multichannel Sensor Signal Processor General Description Features Programmable Amplification, Calibration, The MAX1464 is a highly integrated, low-power, low-noise Linearization, and Temperature Compensation multichannel sensor signal processor optimized for indus- Two Differential or Four Single-Ended ADC Input trial, and process-control applications such as pressure Channels sensing and compensation, RTD and thermocouple lin- Accommodates Sensor Output Sensitivities from earization, weight sensing and classification, and remote 1mV/V to 1V/V process monitoring with limit indication. Two DAC/PWM Output Signal Channels The MAX1464 accepts sensors with either single-ended Supports 420mA Current Loop Applications or differential outputs. The MAX1464 accommodates sen- 4kB of FLASH Memory for Code and Coefficients sor output sensitivities from 1mV/V to 1V/V. The MAX1464 128 Bytes of FLASH Memory for User Information provides amplification, calibration, signal linearization, Integrated Temperature Sensing and temperature compensation that enable an overall Flexible Dual Op-Amp Block performance approaching the inherent repeatability of the Programmable Sensor Input Gain and Offset sensor without requiring any external trim components. Programmable Sensor Sampling Rate and Resolution Two 16-bit voltage-output DACs and two 12-bit PWMs can No External Trim Components Required be used to indicate each of the temperature-compensated sensor signals independently, as a sum or difference Ordering Information signal, or user-defined relationship between each signal PART TEMP RANGE PIN-PACKAGE and temperature. Uncommitted op amps are available to MAX1464CAI 0C to +70C 28 SSOP buffer the DAC outputs, drive heavier external loads, or provide additional gain and filtering. MAX1464C/W* 0C to +70C Die The MAX1464 incorporates a 16-bit CPU, user-pro- MAX1464EAI -40C to +85C 28 SSOP grammable 4kB of FLASH program memory, 128 bytes MAX1464AAI -40C to +125C 28 SSOP of FLASH user information, one 16-bit ADC, two 16-bit *Dice are tested at T = +25C, DC parameters only. A DACs, two 12-bit PWM digital outputs, four rail-to-rail op amps, one SPI-compatible interface, two GPIOs, and Ordering Information one on-chip temperature sensor. TOP VIEW The MAX1464 operates from a single 5.0V (typ) supply OUT1SM 1 28 OUT2SM and is packaged for automotive, industrial, and commer- AMP1M 2 27 AMP2M cial temperature ranges in a 28-pin SSOP package. AMP1P 3 26 AMP2P Applications OUT1LG 4 25 OUT2LG MAX1464 Pressure Sensor Signal Conditioning N.C. 5 24 V REF Weight Measurement Systems V 6 23 INP1 DD Thermocouple and RTD Linearization N.C. 7 22 INM1 Transducers and Transmitters CKSEL 8 21 INP2 Process Indicators CKIO 9 20 INM2 Calibrators and Controllers CS 10 19 V SS GMR and MR Magnetic Direction Sensors DO 11 18 V SSF DI 12 17 GPIO2 SCLK 13 16 GPIO1 Functional Diagram and Detailed Block Diagram appear at end of data sheet. V 14 15 V SS DDF SSOP SPI is a trademark of Motorola, Inc. 19-3579 Rev 1 9/14MAX1464 Low-Power, Low-Noise Multichannel Sensor Signal Processor Absolute Maximum Ratings V to V ............................................................-0.3V to +6.0V Operating Temperature Ranges DD SS V to V .........................................................-0.3V to +6.0V MAX1464CAI .....................................................0C to +70C DDF SS V to V ..........................................................-0.3V to +0.3V MAX1464C/W.....................................................0C to +70C SSF SS All Other Pins to V ..................................-0.3V to (V + 0.3V) MAX1464EAI...................................................-40C to +85C SS DD Continuous Power Dissipation (T = +70C) MAX1464AAI ................................................-40C to +125C A 28-Pin SSOP (derate 9.1mW/C above +70C) ..........727mW Junction Temperature......................................................+150C 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 = V = 4.5V to 5.5V, V = V = 0V, f = 4.0MHz, T = T to T . Typical values are at V = V = 5.0V, V DDF DD SSF SS CLK A MIN MAX DDF DD SSF = V = 0V, T = +25C, unless otherwise noted.) (Note 1) SS A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SUPPLY Supply Voltage V V = V = 0V 4.5 5.0 5.5 V DD SS SSF FLASH Supply Voltage V V = V = 0V 4.5 5.0 5.5 V DDF SS SSF Base Operating Current I CPU stopped (Note 2) 575 720 890 A BO All modules off, CPU = on, additive to I , BO CPU Current I 540 840 1240 A CPU I = I + I (Note 3) CPU DD DDF All modules off, ADC = on, ADC clk = 1MHz, additive to I the CPU and ADC are not on 690 1040 1394 BO at the same time ADC Current (Note 3) I A ADC All modules off, ADC = on, ADC clk = 7kHz, additive to I the CPU and ADC are not on 465 765 1060 BO at the same time All modules off, DAC = on, additive to I BO DAC Current I 425 550 730 A DACn (n = 1 or 2) (Note 4) All modules off, CPU stopped, large op amp Large Op-Amp Current I 430 673 1020 A OPLGn = on (n = 1 or 2) All modules off, CPU stopped, small op amp Small Op-Amp Current I 110 190 265 A OPSMn = on (n = 1 or 2) POWER-ON RESET V POR Threshold V > V 3.6 4.0 4.3 V DDF DD DDF V POR Hysteresis -0.85 V DDF ANALOG INPUT PGA 4:0 = 00000, CLK 2:0 = 000 430 PGA 4:0 = 01010 CLK 2:0 = 000 55 k , PGA 4:0 = 11111, CLK 2:0 = 000 36 PGA 4:0 = 00000, CLK 2:0 = 011 3.4 M Differential Input Impedance (INP1 to INM1 and R PGA 4:0 = 01010, CLK 2:0 = 011 440 DIN k INP2 to INM2) PGA 4:0 = 11111, CLK 2:0 = 011 288 PGA 4:0 = 00000, CLK 2:0 = 110 27 PGA 4:0 = 01010, CLK 2:0 = 110 3.5 M PGA 4:0 = 11111, CLK 2:0 = 110 2.3 Maxim Integrated 2 www.maximintegrated.com