EVALUATION KIT AVAILABLE 16-Bit, Low-Power, 2-Channel, MAX1415/MAX1416 Sigma-Delta ADCs General Description Benefits and Features The MAX1415/MAX1416 low-power, 2-channel, serial- Improve Measurement Quality with Excellent DC output analog-to-digital converters (ADCs) use a sigma- Accuracy delta modulator with a digital filter to achieve 16-bit 16-Bit Sigma-Delta ADC with Two Fully-Differential resolution with no missing codes. These ADCs are pin- Input Channels compatible upgrades to the MX7705/AD7705. The 0.0015% INL (max) with No Missing Codes MAX1415/MAX1416 feature an internal oscillator (1MHz Minimize Power Consumption with Low-Power or 2.4576MHz), an on-chip input buffer, and a program- Dissipation mable gain amplifier (PGA). The devices offer an SPI-/ 1.2mW (max) 3V supply QSPI-/MICROWIRE-compatible serial interface. 2A (typ) Power-Down Current The MAX1415/MAX1416 are available in 16-pin PDIP, Lower System Cost with Integrated Functionality SO, and TSSOP packages. PGA with 1 to 128 Programmable Gain Applications Optional Input Buffers > 98dB 50Hz/60Hz Rejection Industrial Instruments Increase System Accuracy with Built-in Self Calibration Weigh Scales On-Demand Offset and Gain Self-Calibration and Strain-Gauge Measurements System Calibration Loop-Powered Systems User-Programmable Offset and Gain Registers Flow and Gas Meters Flexible Single Supply Options Medical Instrumentation 2.7V to 3.6V (MAX1415) Pressure Transducers 4.75V to 5.25V (MAX1416) Thermocouple Measurements Pin Compatible Upgrades for MX7705/AD7705 RTD Measurements Functional Diagram CLKIN CLOCK GENERATOR CLKOUT MAX1415 MAX1416 BUFFER AIN1+ V 2nd-ORDER DD AIN1- MUX S1 DIGITAL PGA SIGMA-DELTA FILTER S2 MODULATOR GND AIN2+ AIN2- BUFFER CS SERIAL INTERFACE, SCLK S1 AND S2 ARE OPEN IN REGISTERS, DIN BUFFERED MODE AND CLOSED DOUT AND IN UNBUFFERED MODE DRDY CONTROL REF+ RESET REF- SPI/QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. 19-3163 Rev 2 1/1516-Bit, Low-Power, 2-Channel, MAX1415/MAX1416 Sigma-Delta ADCs Absolute Maximum Ratings V to GND..............................................................-0.3V to +6V Operating Temperature Range ..........................-40C to +85C DD All Other Pins to GND.................................-0.3V to (V + 0.3V) Storage Temperature Range .............................-60C to +150C DD Maximum Current Input into Any Pin ..................................50mA Junction Temperature......................................................+150C Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C A 16-Pin PDIP (derate 10.5mW/C above +70C)...........842mW 16-Pin TSSOP (derate 9.4mW/C above +70C) .........755mW 16-Pin Wide SO (derate 9.5mW/C above +70C) ......762mW 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 CharacteristicsMAX1415 (V = 3V, GND = 0, V = 1.225V, V = GND, external f = 2.4576MHz, CLKDIV bit = 0, C to GND = 0.1F, C to DD REF+ REF- CLKIN REF+ REF- GND = 0.1F, T = T to T , unless otherwise noted.) A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS DC ACCURACY Resolution (No Missing Codes) 16 Bits Output Noise (Tables 1, 3) V Integral Nonlinearity INL Gain = 1, bipolar mode, unbuffered 0.0015 %FSR Unipolar Offset Error After calibration (Note 1) V Unipolar Offset Drift (Note 2) 0.5 V/C Bipolar Zero Error After calibration (Note 1) V Gain = 1 to 4 0.5 Bipolar Zero Drift (Note 2) V/C Gain = 8 to 128 0.1 Positive Full-Scale Error After calibration (Notes 1, 3) V Full-Scale Drift (Notes 2, 4) 0.5 V/C Gain Error After calibration (Notes 1, 5) V ppm of Gain Drift (Notes 2, 6) 0.5 FSR/C Bipolar Negative Full-Scale Error After calibration 0.003 %FSR Gain = 1 to 4 1 Bipolar Negative Full-Scale Drift V/C (Note 2) Gain = 8 to 128 0.6 ANALOG INPUTS (AIN1+, AIN1-, AIN2+, AIN2-) V / REF Unipolar input range 0 GAIN AIN Differential Input Voltage V Range (Note 7) -V / V / REF REF Bipolar input range GAIN GAIN GND - V + DD Unbuffered 30mV 30mV AIN Absolute Input Voltage V Range (Note 8) GND + V - DD Buffered 50mV 1.5V AIN DC Leakage Current Unselected input channel 1 nA www.maximintegrated.com Maxim Integrated 2