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

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

Product Details

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

Applications/Uses

  • Automatic Testing
  • Battery-Powered Instruments
  • Data Acquisition Systems
  • Industrial Control Systems
  • Medical Instruments
  • Robotics
Parametric specs for Precision ADCs (≤ 5Msps)
Resolution (bits) (ADC) 12
# Input Channels 8
Conv. Rate (ksps) (max) 110
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input S.E. Only
Internal VREF (V) (nominal) 4.096
External VREF (V) (min) 2.4
External VREF (V) (max) 4.18
Unipolar VIN (V) (max) 4.096
Bipolar VIN (±V) (max) 2.048
INL (±LSB) 1
Package/Pins PDIP/24
SSOP/28
Budgetary
Price (See Notes)
$12.15 @1k
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Simplified Block Diagram

MAX1270, MAX1270A, MAX1270B, MAX1271, MAX1271A, MAX1271B: Typical Operating Circuit MAX1270, MAX1270A, MAX1270B, MAX1271, MAX1271A, MAX1271B: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX1270 evaluation system (EV system) is a complete, 8-channel data-acquisition system consisting of a MAX1270 evaluation kit (EV kit) and a Maxim 68HC16MODULE-DIP microcontroller (µC) module. It is designed to evaluate the MAX1270/MAX1271, a multirange, 8-channel, 12-bit data acquisition system. Windows® 3.1/Windows 95 software provides a handy user interface to exercise the MAX1270's features.

Order the complete EV system (MAX1270EVC16) for comprehensive evaluation of the MAX1270 or MAX1271 using a personal computer. Order the EV kit (MAX1270EVKIT) if you have already purchased the µC module (68HC16MODULE-DIP) with another Maxim EV system or for custom use in other µC-based systems.

The MAX1270 EV kit can also be used to evaluate the MAX127 and MAX128.

View Details

Features

  • Proven PC Board Layout
  • Complete Evaluation System Samples to 12ksps
  • Convenient Test Points Provided On-Board
  • Data-Logging Software with FFT Capability
  • Fully Assembled and Tested

Description

The MAX1270 evaluation system (EV system) is a complete, 8-channel data-acquisition system consisting of a MAX1270 evaluation kit (EV kit) and a Maxim 68HC16MODULE-DIP microcontroller (µC) module. It is designed to evaluate the MAX1270/MAX1271, a multirange, 8-channel, 12-bit data acquisition system. Windows® 3.1/Windows 95 software provides a handy user interface to exercise the MAX1270's features.

Order the complete EV system (MAX1270EVC16) for comprehensive evaluation of the MAX1270 or MAX1271 using a personal computer. Order the EV kit (MAX1270EVKIT) if you have already purchased the µC module (68HC16MODULE-DIP) with another Maxim EV system or for custom use in other µC-based systems.

The MAX1270 EV kit can also be used to evaluate the MAX127 and MAX128.

View Details

Features

  • Proven PC Board Layout
  • Complete Evaluation System Samples to 12ksps
  • Convenient Test Points Provided On-Board
  • Data-Logging Software with FFT Capability
  • Fully Assembled and Tested

Description

The MAX1270 evaluation system (EV system) is a complete, 8-channel data-acquisition system consisting of a MAX1270 evaluation kit (EV kit) and a Maxim 68HC16MODULE-DIP microcontroller (µC) module. It is designed to evaluate the MAX1270/MAX1271, a multirange, 8-channel, 12-bit data acquisition system. Windows® 3.1/Windows 95 software provides a handy user interface to exercise the MAX1270's features.

Order the complete EV system (MAX1270EVC16) for comprehensive evaluation of the MAX1270 or MAX1271 using a personal computer. Order the EV kit (MAX1270EVKIT) if you have already purchased the µC module (68HC16MODULE-DIP) with another Maxim EV system or for custom use in other µC-based systems.

The MAX1270 EV kit can also be used to evaluate the MAX127 and MAX128.

View Details

Features

  • Proven PC Board Layout
  • Complete Evaluation System Samples to 12ksps
  • Convenient Test Points Provided On-Board
  • Data-Logging Software with FFT Capability
  • Fully Assembled and Tested

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Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.

Parameters

Parametric specs for Precision ADCs (≤ 5Msps)
Resolution (bits) (ADC) 12
# Input Channels 8
Conv. Rate (ksps) (max) 110
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input S.E. Only
Internal VREF (V) (nominal) 4.096
External VREF (V) (min) 2.4
External VREF (V) (max) 4.18
Unipolar VIN (V) (max) 4.096
Bipolar VIN (±V) (max) 2.048
INL (±LSB) 1
Package/Pins PDIP/24
SSOP/28
Budgetary
Price (See Notes)
$12.15 @1k

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

Applications/Uses

  • Automatic Testing
  • Battery-Powered Instruments
  • Data Acquisition Systems
  • Industrial Control Systems
  • Medical Instruments
  • Robotics

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 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.

Simplified Block Diagram

MAX1270, MAX1270A, MAX1270B, MAX1271, MAX1271A, MAX1271B: Typical Operating Circuit MAX1270, MAX1270A, MAX1270B, MAX1271, MAX1271A, MAX1271B: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal.