MAX1270BCAI

19-4782; Rev 2; 9/04 KIT ATION EVALU E L B A IL AVA Multirange, +5V, 8-Channel, Serial 12-Bit ADCs Features The MAX1270/MAX1271 are multirange, 12-bit dataacquisition systems (DAS) that require only a single +5V supply for operation, yet accept signals at their analog inputs that can span above the power-supply rail and below ground. These systems provide eight analog input channels that are independently software programmable for a variety of ranges: ±10V, ±5V, 0 to +10V, 0 to +5V for the MAX1270; ±VREF, ±VREF/2, 0 to VREF, 0 to VREF/2 for the MAX1271. This range switching increases the effective dynamic range to 14 bits and provides the flexibility to interface 4–20mA, ±12V, and ±15V powered sensors directly to a single +5V system. In addition, these converters are fault protected to ±16.5V; a fault condition on any channel will not affect the conversion result of the selected channel. Other features include a 5MHz bandwidth track/hold, softwareselectable internal/external clock, 110ksps throughput rate, and internal 4.096V or external reference operation. ♦ 12-Bit Resolution, 0.5 LSB Linearity The MAX1270/MAX1271 serial interface directly connects to SPI™/QSPI™ and MICROWIRE™ devices without external logic. A hardware shutdown input (SHDN) and two softwareprogrammable power-down modes, standby (STBYPD) or full power-down (FULLPD), are provided for low-current shutdown between conversions. In standby mode, the reference buffer remains active, eliminating startup delays. ♦ Internal or External Clock ♦ +5V Single-Supply Operation ♦ SPI/QSPI and MICROWIRE-Compatible 3-Wire Interface ♦ Four Software-Selectable Input Ranges MAX1270: 0 to +10V, 0 to +5V, ±10V, ±5V MAX1271: 0 to VREF, 0 to VREF/2, ±VREF, ±VREF/2 ♦ Eight Analog Input Channels ♦ 110ksps Sampling Rate ♦ ±16.5V Overvoltage-Tolerant Input Multiplexer ♦ Internal 4.096V or External Reference ♦ Two Power-Down Modes ♦ 24-Pin Narrow PDIP or 28-Pin SSOP Packages Typical Operating Circuit +5V 0.1µF The MAX1270/MAX1271 are available in 24-pin narrow PDIP or space-saving 28-pin SSOP packages. VDD Applications SHDN Industrial Control Systems Automatic Testing Data-Acquisition Systems Robotics Battery-Powered Medical Instruments Instruments CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 ANALOG INPUTS MAX1270 MAX1271 MC68HCXX Ordering Information PART TEMP RANGE PIN-PACKAGE INL (LSB) MAX1270ACNG 0°C to +70°C 24 Narrow PDIP ±0.5 MAX1270BCNG 0°C to +70°C 24 Narrow PDIP ±1 MAX1270ACAI 0°C to +70°C 28 SSOP MAX1270BCAI 0°C to +70°C 28 SSOP Ordering Information continued at end of data sheet. REF REFADJ 4.7µF 0.01µF DGND CS SCLK DIN DOUT SSTRB I/O SCK MOSI MISO AGND ±0.5 ±1 Pin Configurations appear at end of data sheet. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. ________________________________________________________________ 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 MAX1270/MAX1271 General Description MAX1270/MAX1271 Multirange, +5V, 8-Channel, Serial 12-Bit ADCs ABSOLUTE MAXIMUM RATINGS VDD to AGND............................................................-0.3V to +6V AGND to DGND.....................................................-0.3V to +0.3V CH0–CH7 to AGND ......................................................... ±16.5V REF, REFADJ to AGND ..............................-0.3V to (VDD + 0.3V) SSTRB, DOUT to DGND.............................-0.3V to (VDD + 0.3V) SHDN, CS, DIN, SCLK to DGND..............................-0.3V to +6V Max Current into Any Pin ....................................................50mA Continuous Power Dissipation (TA = +70°C) 24-Pin Narrow DIP (derate 13.33mW/°C above +70°C)..1067mW 28-Pin SSOP (derate 9.52mW/°C above +70°C) ..........762mW Operating Temperature Ranges MAX127_C_ _......................................................0°C to +70°C MAX127_E_ _......................................................-40°C to +85°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 = +5.0V ±5%; unipolar/bipolar range; external reference mode, VREF = +4.096V; 4.7µF at REF; external clock; fCLK = 2.0MHz, 50% duty cycle (MAX127_B); fCLK = 1.8MHz, 50% duty cycle (MAX127_A); 18 clock/conversion cycle, TA = TMIN to TMAX, unless otherwise noted. Typical values are TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS ACCURACY (Note 1) Resolution 12 Integral Nonlinearity INL Differential Nonlinearity DNL ±0.5 MAX127_B ±1.0 Unipolar Bipolar ±5 ±5 LSB ±10 MAX127_B Bipolar ±0.3 Bipolar Gain Error Temperature Coefficient (Note 2) MAX127_B MAX127_A ±0.1 Gain Error (Note 2) LSB ±3 MAX127_A Unipolar Unipolar LSB ±1 No missing codes over temperature Offset Error Channel-to-Channel Offset Error Matching Bits MAX127_A LSB MAX127_A ±7 MAX127_B ±10 MAX127_A ±7 LSB ±10 MAX127_B Unipolar, external reference ±3 Bipolar, external reference ±5 ppm/°C DYNAMIC SPECIFICATIONS (10kHz sine-wave input, ±10VP-P (MAX1270), or ±4.096VP-P (MAX1271), fSAMPLE = 110ksps (MAX127_B), fSAMPLE = 100ksps (MAX127_A)) Signal-to-Noise + Distortion Ratio SINAD Total Harmonic Distortion THD Spurious-Free Dynamic Range SFDR Channel-to-Channel Crosstalk Aperture Delay Aperture Jitter 2 70 Up to the 5th harmonic dB -87 80 -78 dB dB 50kHz (Note 3) -86 DC, VIN = ±16.5V -96 External clock mode 15 ns External clock mode