MAX1272CUA

19-2921; Rev 1; 12/03 Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range General Description The MAX1272/MAX1273 multirange 12-bit data-acquisition systems (DAS) operate with a single 5V supply. The software-programmable analog input accepts a variety of voltage ranges: ±10V, ±5V, 0 to 10V, 0 to 5V for the MAX1272; ±VREF, ±VREF / 2, 0 to VREF, 0 to VREF / 2 for the MAX1273. The software-selectable extended analog input range increases the effective dynamic range to 14 bits and provides the flexibility to interface 4–20mA powered sensors directly to a single 5V system. In addition, the MAX1272 provides fault protection to ±12V. Other features include a 5MHz track/hold (T/H) bandwidth, 87ksps throughput rate, and internal (4.096V) or external (2.40V to 4.18V) reference. The MAX1272/MAX1273 serial interfaces connect directly to SPI™/QSPI™/MICROWIRE™-compatible devices without any external logic. Four software-programmable power-down modes (delayed standby, immediate standby, delayed full powerdown, and immediate full power-down) provide low-current shutdown between conversions. In standby mode, the internal reference buffer remains active, thus eliminating startup delay. The MAX1272/MAX1273 are available in 8-pin PDIP and µMAX packages. Both devices are available in the commercial (0°C to +70°C) or extended (-40°C to +85°C) temperature range. Features o Four Software-Selectable Input Ranges MAX1272: 0 to 10V, 0 to 5V, ±10V, ±5V MAX1273: 0 to VREF, 0 to VREF / 2, ±VREF, ±VREF / 2 o 12-Bit Resolution, No Missing Codes o 5V Single-Supply Operation o SPI/QSPI/MICROWIRE-Compatible 3-Wire Interface o 87ksps Sampling Rate o ±12V Fault-Protected Analog Input (MAX1272) o Internal (4.096V) or External (2.4V to 4.18V) Reference o Low Power 1.5mA at 87ksps 0.4mA at 10ksps 0.2mA at 1ksps o Four Power-Down Modes o 8-Pin µMAX and PDIP Packages MAX1272/MAX1273 Ordering Information PART MAX1272CPA MAX1272CUA MAX1272EPA MAX1272EUA MAX1273CPA MAX1273CUA MAX1273EPA MAX1273EUA TEMP RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PINPACKAGE 8 Plastic DIP 8 µMAX 8 Plastic DIP 8 µMAX 8 Plastic DIP 8 µMAX 8 Plastic DIP 8 µMAX INL (LSB) ±1 ±1 ±1 ±1 ±1 ±1 ±1 ±1 Applications Industrial Control Systems Data-Acquisition Systems Robotics Automatic Testing Battery-Powered Instruments Medical Instruments Pin Configuration TOP VIEW SCLK DIN 1 2 3 8 7 DOUT CS REF AIN Typical Application Circuit appears at end of data sheet. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. VDD MAX1272 MAX1273 6 5 GND 4 PDIP/µMAX ________________________________________________________________ Maxim Integrated Products 1 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. Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range MAX1272/MAX1273 ABSOLUTE MAXIMUM RATINGS VDD to GND ..............................................................-0.3V to +6V AIN to GND (MAX1272) ...................................................... ±12V AIN to GND (MAX1273) ........................................................ ±6V DOUT, CS, DIN, SCLK, REF to GND..........-0.3V to (VDD + 0.3V) Maximum Current into Any Pin............................................50mA Continuous Power Dissipation (TA = +70°C) 8-Pin Plastic DIP (derate 9.1mW/°C above +70°C) ......727mW 8-Pin µMAX (derate 4.5mW/°C above +70°C) ..............362mW 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 Junction Temperature .....................................................+150°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 = 4.75V to 5.25V, unipolar/bipolar input range, external reference mode, VREF = 4.096V, CREF = 1.0µF, fSCLK = 1.4MHz, 50% duty cycle, CLOAD = 50pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETERS ACCURACY (Note 1) Resolution Integral Nonlinearity Differential Nonlinearity Offset Error Gain Error (Note 2) Gain Error Temperature Coefficient (Note 2) Signal-to-Noise + Distortion Ratio Total Harmonic Distortion Spurious-Free Dynamic Range Aperture Delay Aperture Jitter ANALOG INPUT T/H Acquisition Time tACQ 2.85 µs SINAD THD SFDR tAD tAJ Up to the 5th harmonic 80 INL DNL No missing codes over temperature Unipolar Bipolar Unipolar Bipolar Unipolar Bipolar 69 ±3 ±5 72 -87 88 15