MAX197ACWI

19-0381; Rev 2; 9/01 KIT ATION EVALU ABLE IL A V LA MANUA Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface ________________________Applications Industrial-Control Systems Robotics Data-Acquisition Systems Automatic Testing Systems Medical Instruments Telecommunications Functional Diagram appears at end of data sheet. ____________________________Features ♦ 12-Bit Resolution, 1/2LSB Linearity ♦ Single +5V Operation ♦ Software-Selectable Input Ranges: ±10V, ±5V, 0V to 10V, 0V to 5V ♦ Fault-Protected Input Multiplexer (±16.5V) ♦ 8 Analog Input Channels ♦ 6µs Conversion Time, 100ksps Sampling Rate ♦ Internal or External Acquisition Control ♦ Internal 4.096V or External Reference ♦ Two Power-Down Modes ♦ Internal or External Clock ______________Ordering Information PART TEMP RANGE PIN-PACKAGE MAX197ACNI 0°C to +70°C 28 Narrow Plastic DIP MAX197BCNI 0°C to +70°C 28 Narrow Plastic DIP MAX197ACWI 0°C to +70°C 28 Wide SO MAX197BCWI 0°C to +70°C 28 Wide SO MAX197ACAI 0°C to +70°C 28 SSOP MAX197BCAI 0°C to +70°C 28 SSOP MAX197BC/D 0°C to +70°C Dice* Ordering Information continued at end of data sheet. *Dice are specified at TA = +25°C, DC parameters only. __________________Pin Configuration TOP VIEW CLK 1 28 DGND 27 VDD CS 2 WR 3 26 REF RD 4 25 REFADJ HBEN 5 SHDN 6 D7 7 MAX197 24 INT 23 CH7 22 CH6 D6 8 21 CH5 D5 9 20 CH4 D4 10 19 CH3 D3/D11 11 18 CH2 D2/D10 12 17 CH1 D1/D9 13 16 CH0 D0/D8 14 15 AGND DIP/SO/SSOP/Ceramic SB ________________________________________________________________ Maxim Integrated Products 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. 1 MAX197 _______________General Description The MAX197 multi-range, 12-bit data-acquisition system (DAS) requires only a single +5V supply for operation, yet accepts signals at its analog inputs that may span both above the power-supply rail and below ground. This system provides 8 analog input channels that are independently software programmable for a variety of ranges: ±10V, ±5V, 0V to +10V, or 0V to +5V. This increases effective dynamic range to 14 bits, and provides the user flexibility to interface 4mA-to-20mA, ±12V, and ±15V powered sensors to a single +5V system. In addition, the converter is overvoltage tolerant to ±16.5V; a fault condition on any channel does not affect the conversion result of the selected channel. Other features include a 5MHz bandwidth track/hold, a 100ksps throughput rate, software-selectable internal or external clock and acquisition, 8+4 parallel interface, and an internal 4.096V or an external reference. A hardware SHDN pin and two programmable powerdown modes (STBYPD, FULLPD) are provided for lowcurrent shutdown between conversions. In STBYPD mode, the reference buffer remains active, eliminating start-up delays. The MAX197 employs a standard microprocessor (µP) interface. A three-state data I/O port is configured to operate with 8-bit data buses, and data-access and bus-release timing specifications are compatible with most popular µPs. All logic inputs and outputs are TTL/CMOS compatible. The MAX197 is available in 28-pin DIP, wide SO, SSOP, and ceramic SB packages. For a different combination of ranges (±4V, ±2V, 0V to 4V, 0V to 2V), refer to the MAX199 data sheet. For 12-bit bus interface, refer to the MAX196 and MAX198 data sheets. MAX197 Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface ABSOLUTE MAXIMUM RATINGS VDD to AGND............................................................-0.3V to +7V AGND to DGND.....................................................-0.3V to +0.3V REF to AGND..............................................-0.3V to (VDD + 0.3V) REFADJ to AGND.......................................-0.3V to (VDD + 0.3V) Digital Inputs to DGND...............................-0.3V to (VDD + 0.3V) Digital Outputs to DGND ............................-0.3V to (VDD + 0.3V) CH0–CH7 to AGND ..........................................................±16.5V Continuous Power Dissipation (TA = +70°C) Narrow Plastic DIP (derate 14.29mW/°C above +70°C)....1143mW Wide SO (derate 12.50mW/°C above +70°C)..............1000mW SSOP (derate 9.52mW/°C above +70°C) ......................762mW Narrow Ceramic SB (derate 20.00mW/°C above +70°C)..1600mW Operating Temperature Ranges MAX197_C_ _ .......................................................0°C to +70°C MAX197_E_ _.....................................................-40°C to +85°C MAX197_M_ _ ..................................................-55°C to +125°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 (VDD = 5V ±5%; unipolar/bipolar range; external reference mode, VREF = 4.096V; 4.7µF at REF pin; external clock, fCLK = 2.0MHz with 50% duty cycle; TA = TMIN to TMAX, unless otherwise noted.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ACCURACY (Note 1) Resolution 12 Integral Nonlinearity INL Differential Nonlinearity DNL ±1/2 MAX197B ±1 ±1 Unipolar Offset Error Bipolar Channel-to-Channel Offset Error Matching MAX197A MAX197B ±5 MAX197A ±5 MAX197B ±10 ±0.1 Bipolar ±0.5 Gain Error (Note 2) Bipolar LSB LSB ±3 Unipolar Unipolar Gain Temperature Coefficient (Note 2) Bits MAX197A LSB MAX197A ±7 MAX197B ±10 MAX197A ±7 MAX197B LSB LSB ±10 Unipolar 3 Bipolar 5 ppm/°C DYNAMIC SPECIFICATIONS (10kHz sine-wave input, ±10Vp-p, fSAMPLE = 100ksps) Signal-to-Noise + Distortion Ratio SINAD Total Harmonic Distortion THD Spurious-Free Dynamic Range SFDR MAX197A 70 MAX197B 69 Up to the 5th harmonic dB -85 80 -78 dB dB Channel-to-Channel Crosstalk 50kHz, VIN = ±5V (Note 3) -86 dB Aperture Delay External CLK mode/external acquisition control 15 ns