Features: 12-Bit Resolution, 0.5 LSB Linearity
+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
Internal or External Clock
24-Pin Narrow PDIP or 28-Pin SSOP PackagesApplicationIndustrial Control Systems Automatic Testing
Data-Acquisition Systems Robotics
Battery-Powered Medical Instruments
InstrumentsPinout
SpecificationsVDD to AGND..................................................................0.3V to +6V Operating Temperature Ranges
AGND to DGND...........................................................-0.3V to +0.3V MAX127_C_ _......................................................0 to +70
CH0CH7 to AGND ............................................................ ±16.5V MAX127_E_ _......................................................-40 to +85
REF, REFADJ to AGND ..........................................-0.3V to (V + 0.3V)
DD Storage Temperature Range...............................-65 to +150
SSTRB, DOUT to DGND......................................-0.3V to (VDD + 0.3V)
Lead Temperature (soldering, 10s).........................................+300
SHDN, CS, DIN, SCLK to DGND........................................-0.3V to +6V
Max Current into Any Pin ..........................................................50mA
Continuous Power Dissipation ........................................(TA = +70)
24-Pin Narrow DIP (derate 13.33mW/ above +70)...........1067mW
28-Pin SSOP (derate 9.52mW/ above +70) ........................762mWDescriptionThe MAX1270/MAX1271 are multirange, 12-bit data-acquisition 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 switch-ing increases the effective dynamic range to 14 bits and provides the flexibility to interface 420mA, ±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 fea-tures include a 5MHz bandwidth track/hold, software- selectable internal/external clock, 110ksps throughput rate, and internal 4.096V or external reference operation.
The MAX1270/MAX1271 serial interface directly connects to SPI(TM)/QSPI(TM) and MICROWIRE(TM) devices without external logic. A hardware shutdown input (SHDN) and two software-programmable power-down modes, standby (STBYPD) or full power-down (FULLPD), are provided for low-cur-rent shutdown between conversions. In standby mode, the reference buffer remains active, eliminating startup delays.The MAX1270/MAX1271 are available in 24-pin narrow PDIP or space-saving 28-pin SSOP packages.
MAX1271 Data Sheet
