• 简体中文
• English

MAX1271A, MAX1271B：Multirange, +5V, 8-Channel, Serial 12-Bit ADCs

12-Bit, 8-Channel, Serial ADCs Have +/-17V Fault-Protected Inputs

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 may 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, 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-bar) and two software-programmable 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 start-up delays. The MAX1270/MAX1271 are available in 24-pin narrow DIP or space-saving 28-pin SSOP packages.

Key Features 12-Bit Resolution, 1/2LSB 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 DIP or 28-Pin SSOP Packages

MAX1270, MAX1270A, MAX1270B, MAX1271, MAX1271A, MAX1271B: Typical Operating Circuit Applications/Uses Automatic Testing Battery-Powered Instruments Data Acquisition Systems Industrial Control Systems Medical Instruments Robotics

DataSheet

Parametrics

Design kits & evaluation modules

• MAX1270EVC16
• MAX1270EVKIT
• MAX1270EVSYS

Related Products

• MAX11637：12-Bit, 300ksps ADCs with Differential Track/Hold, and Internal Reference
• MAX11629：12-Bit, 300ksps ADCs with FIFO and Internal Reference
• MAX197：Multi-Range (±10V, ±5V, +10V, +5V), Single +5V, 12-Bit DAS with 8+4 Bus Interface
• MAX146：+2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCs
• MAX196：6-Channel, Multirange, 5V, 12-Bit DAS with 12-Bit Bus Interface and Fault Protection
• MAX198：6-Channel, Multirange, 5V, 12-Bit DAS with 12-Bit Bus Interface and Fault Protection
• MAX199：8-Channel, Multi-Range, 5V, 12-Bit DAS with 8+4 Bus Interface and Fault Protection

Ordering Information