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MAX1270ACAI Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1270ACAI Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 20 page General Description The 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 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 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™/QSPI™ and MICROWIRE™ 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. Applications 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 Packages Multirange, +5V, 8-Channel, Serial 12-Bit ADCs ________________________________________________________________ Maxim Integrated Products 1 VDD CH0 CH1 CH2 CH3 CH4 CH5 CH6 CH7 DGND 4.7µF 0.1µF 0.01µF SHDN MAX1270 MAX1271 +5V ANALOG INPUTS CS SCLK DIN DOUT SSTRB I/O SCK MOSI MISO REF REFADJ AGND MC68HCXX Typical Operating Circuit 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 ±0.5 MAX1270BCAI 0°C to +70°C 28 SSOP ±1 Ordering Information 19-4782; Rev 2; 9/04 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. Pin Configurations appear at end of data sheet. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. Ordering Information continued at end of data sheet. EVALUATION KIT AVAILABLE Industrial Control Systems Data-Acquisition Systems Battery-Powered Instruments Automatic Testing Robotics Medical Instruments |
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