MAX1272/MAX1273 19-2921 Rev 3 12/11 Fault-Protected, 12-Bit ADCs with Software-Selectable Input Range General Description Features The MAX1272/MAX1273 multirange 12-bit data-acquisi- Four Software-Selectable Input Ranges tion systems (DAS) operate with a single 5V supply. The MAX1272: 0 to 10V, 0 to 5V, 10V, 5V software-programmable analog input accepts a variety MAX1273: 0 to V , 0 to V /2, V , REF REF REF of voltage ranges: 10V, 5V, 0 to 10V, 0 to 5V for the V /2 REF MAX1272 V , V /2, 0 to V , 0 to V /2 for the REF REF REF REF 12-Bit Resolution, No Missing Codes MAX1273. The software-selectable extended analog input range increases the effective dynamic range to 14 5V Single-Supply Operation bits and provides the flexibility to interface 420mA pow- SPI/QSPI/MICROWIRE-Compatible 3-Wire ered sensors directly to a single 5V system. In addition, Interface the MAX1272 provides fault protection to 12V. Other 87ksps Sampling Rate features include a 5MHz track/hold (T/H) bandwidth, 87ksps throughput rate, and internal (4.096V) or external 12V Fault-Protected Analog Input (MAX1272) (2.40V to 4.18V) reference. Internal (4.096V) or External (2.4V to 4.18V) The MAX1272/MAX1273 serial interfaces connect Reference directly to SPI/QSPI/MICROWIRE -compatible Low Power devices without any external logic. 1.5mA at 87ksps Four software-programmable power-down modes 0.4mA at 10ksps (delayed standby, immediate standby, delayed full power- 0.2mA at 1ksps down, and immediate full power-down) provide low-cur- Four Power-Down Modes rent shutdown between conversions. In standby mode, the internal reference buffer remains active, thus eliminating 8-Pin MAX Package startup delay. The MAX1272/MAX1273 are available in an 8-pin Ordering Information MAX package. Both devices are available in the extended (-40C to +85C) temperature range. TEMP PIN- INL PART RANGE PACKAGE (LSB) Applications MAX1272EUA+ -40C to +85C 8 MAX 1 Industrial Control Systems MAX1273EUA+ -40C to +85C 8 MAX 1 Data-Acquisition Systems +Denotes a lead(Pb)-free/RoHS-compliant package. Robotics Automatic Testing Battery-Powered Instruments Medical Instruments Pin Configuration TOP VIEW + SCLK 1 8 DOUT DIN 2 7 CS Typical Application Circuit appears at end of data sheet. MAX1272 VDD 3 6 REF MAX1273 GND 4 5 AIN QSPI is a trademark of Motorola, Inc. MAX MICROWIRE is a registered trademark of National Semiconductor Corp. MAX is a registered trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLEFault-Protected, 12-Bit ADCs with Software-Selectable Input Range ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +6V Operating Temperature Ranges DD AIN to GND (MAX1272)...................................................... 12V Storage Temperature Range .............................-65C to +150C AIN to GND (MAX1273)........................................................ 6V Junction Temperature .....................................................+150C DOUT, CS, DIN, SCLK, REF to GND..........-0.3V to (V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C DD Maximum Current into Any Pin............................................50mA Soldering Temperature (reflow) .......................................+260C Continuous Power Dissipation (T = +70C) A MAX Single-Layer Board (derate 4.5mW/ C above +70C).........362mW Multilayer Board (derate 4.8mW/ C above +70C)...........387.8mW 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 = 4.75V to 5.25V, unipolar/bipolar input range, external reference mode, V = 4.096V, C = 1.0F, f = 1.4MHz, DD REF REF SCLK 50% duty cycle, C = 50pF, T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) LOAD A A PARAMETERS SYMBOL CONDITIONS MIN TYP MAX UNITS ACCURACY (Note 1) Resolution 12 Bits Integral Nonlinearity INL 0.3 1.0 LSB Differential Nonlinearity DNL No missing codes over temperature 0.35 1.00 LSB Unipolar 7.5 Offset Error LSB Bipolar 7.5 Unipolar 5 Gain Error (Note 2) LSB Bipolar 7 Unipolar 3 Gain Error Temperature ppm/C Coefficient (Note 2) Bipolar 5 DYNAMIC SPECIFICATIONS (10kHz sine-wave input, 10V (MAX1272), or 4.096V (MAX1273), f = 87ksps) P-P P-P SAMPLE Signal-to-Noise + Distortion Ratio SINAD 69 72 dB Total Harmonic Distortion THD Up to the 5th harmonic -87 -78 dB Spurious-Free Dynamic Range SFDR 80 88 dB Aperture Delay t 15 ns AD Aperture Jitter t <50 ps AJ ANALOG INPUT T/H Acquisition Time t 2.85 s ACQ 2 MAX1272/MAX1273