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Multichannel, True-Differential, Serial, 14-Bit ADCs

Product Details

The MAX1146–MAX1149 low-power, 14-bit, multichannel, analog-to-digital converters (ADCs) feature an internal track/hold (T/H), voltage reference, and clock. The MAX1146/MAX1148 operate from a single +4.75V to +5.25V supply, and the MAX1147/MAX1149 operate from a single +2.7V to +3.6V supply. All analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.

The 4-wire serial interface connects directly to SPI™/QSPI™/MICROWIRE™ devices without external logic. The serial strobe output (SSTRB) allows convenient connection to digital signal processors. The MAX1146–MAX1149 use an internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.

The MAX1146/MAX1148 include an internal +4.096V reference, while the MAX1147/MAX1149 include an internal +2.500V reference. All devices accept an external reference from 1.5V to VDD.

The MAX1146–MAX1149 provide a hardware shutdown and two software power-down modes. Using the software power-down modes allows the devices to be powered down between conversions. When powered down, accessing the serial interface automatically powers up the devices. The quick turn-on time allows power-down between all conversions. This technique reduces supply current to under 120µA for quick turn-on. The MAX1146–MAX1149 are available in a 20-pin TSSOP package.

Key Features

  • 8-Channel Single-Ended or 4-Channel Differential Inputs (MAX1148/MAX1149)
  • 4-Channel Single-Ended or 2-Channel Differential Inputs (MAX1146/MAX1147)
  • Internal Multiplexer and T/H
  • Single-Supply Operation
    • 4.75V to 5.25V Supply (MAX1146/MAX1148)
    • 2.7V to 3.6V Supply (MAX1147/MAX1149)
  • Internal Reference
    • +4.096V (MAX1146/MAX1148)
    • +2.500V (MAX1147/MAX1149)
  • 116ksps Sampling Rate
  • Low Power
    • 1.1mA (116ksps)
    • 120µA (10ksps)
    • 12µA (1ksps)
    • 300nA (Power-Down Mode)
  • SPI-/QSPI-/MICROWIRE Compatible
  • 20-Pin TSSOP

Applications/Uses

  • Battery-Powered Instruments
  • Data Acquisition
  • Medical Instruments
  • Portable Data Logging
  • Process Control
Parametric specs for Precision ADCs (< 5Msps)
Resolution (bits) (ADC) 14
# Input Channels 8
Conv. Rate (ksps) (max) 116
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 4.096
External VREF (V) (min) 1.5
External VREF (V) (max) 5
Unipolar VIN (V) (max) 4.096
Bipolar VIN (±V) (max) 4.096
INL (±LSB) 0.7
Package/Pins TSSOP/20
Budgetary
Price (See Notes)
$14.26 @1k
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Simplified Block Diagram

MAX1146, MAX1147, MAX1148, MAX1149: Pin Configuration MAX1146, MAX1147, MAX1148, MAX1149: Pin Configuration Zoom icon

Technical Docs

Design & Development

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

Description

The MAX1149 evaluation system (EV system) is a complete, 8-channel data-acquisition system consisting of a MAX1149 evaluation kit (EV kit) and a Maxim CMODUSB microcontroller (µC) module. The MAX1149 is a high-speed, multichannel, 14-bit data-acquisition system. Windows® 98/2000/XP software provides a convenient user interface to exercise the MAX1149's features.

Order the complete EV system (MAX1149EVCMODU) for comprehensive evaluation of the MAX1149 using a personal computer. Order the EV kit (MAX1149EVKIT) if the CMODUSB module has already been purchased with a previous Maxim EV system, or for custom use in other µC-based systems.

This system can also evaluate the MAX1146/MAX1147/MAX1148. See the Detailed Description of Hardware section for more details. Contact the factory for free samples of these products.

View Details

Features

  • Proven PC Board Layout
  • Convenient Test Points Provided On Board
  • Data-Logging Software
  • Fully Assembled and Tested

Description

The MAX1149 evaluation system (EV system) is a complete, 8-channel data-acquisition system consisting of a MAX1149 evaluation kit (EV kit) and a Maxim CMODUSB microcontroller (µC) module. The MAX1149 is a high-speed, multichannel, 14-bit data-acquisition system. Windows® 98/2000/XP software provides a convenient user interface to exercise the MAX1149's features.

Order the complete EV system (MAX1149EVCMODU) for comprehensive evaluation of the MAX1149 using a personal computer. Order the EV kit (MAX1149EVKIT) if the CMODUSB module has already been purchased with a previous Maxim EV system, or for custom use in other µC-based systems.

This system can also evaluate the MAX1146/MAX1147/MAX1148. See the Detailed Description of Hardware section for more details. Contact the factory for free samples of these products.

View Details

Features

  • Proven PC Board Layout
  • Convenient Test Points Provided On Board
  • Data-Logging Software
  • 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 (<u><</u> 5Msps)
Resolution (bits) (ADC) 14
# Input Channels 8
Conv. Rate (ksps) (max) 116
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 4.096
External VREF (V) (min) 1.5
External VREF (V) (max) 5
Unipolar VIN (V) (max) 4.096
Bipolar VIN (±V) (max) 4.096
INL (±LSB) 0.7
Package/Pins TSSOP/20
Budgetary
Price (See Notes)
$14.26 @1k

Key Features

  • 8-Channel Single-Ended or 4-Channel Differential Inputs (MAX1148/MAX1149)
  • 4-Channel Single-Ended or 2-Channel Differential Inputs (MAX1146/MAX1147)
  • Internal Multiplexer and T/H
  • Single-Supply Operation
    • 4.75V to 5.25V Supply (MAX1146/MAX1148)
    • 2.7V to 3.6V Supply (MAX1147/MAX1149)
  • Internal Reference
    • +4.096V (MAX1146/MAX1148)
    • +2.500V (MAX1147/MAX1149)
  • 116ksps Sampling Rate
  • Low Power
    • 1.1mA (116ksps)
    • 120µA (10ksps)
    • 12µA (1ksps)
    • 300nA (Power-Down Mode)
  • SPI-/QSPI-/MICROWIRE Compatible
  • 20-Pin TSSOP

Applications/Uses

  • Battery-Powered Instruments
  • Data Acquisition
  • Medical Instruments
  • Portable Data Logging
  • Process Control

Description

The MAX1146–MAX1149 low-power, 14-bit, multichannel, analog-to-digital converters (ADCs) feature an internal track/hold (T/H), voltage reference, and clock. The MAX1146/MAX1148 operate from a single +4.75V to +5.25V supply, and the MAX1147/MAX1149 operate from a single +2.7V to +3.6V supply. All analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.

The 4-wire serial interface connects directly to SPI™/QSPI™/MICROWIRE™ devices without external logic. The serial strobe output (SSTRB) allows convenient connection to digital signal processors. The MAX1146–MAX1149 use an internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.

The MAX1146/MAX1148 include an internal +4.096V reference, while the MAX1147/MAX1149 include an internal +2.500V reference. All devices accept an external reference from 1.5V to VDD.

The MAX1146–MAX1149 provide a hardware shutdown and two software power-down modes. Using the software power-down modes allows the devices to be powered down between conversions. When powered down, accessing the serial interface automatically powers up the devices. The quick turn-on time allows power-down between all conversions. This technique reduces supply current to under 120µA for quick turn-on. The MAX1146–MAX1149 are available in a 20-pin TSSOP package.

Simplified Block Diagram

MAX1146, MAX1147, MAX1148, MAX1149: Pin Configuration MAX1146, MAX1147, MAX1148, MAX1149: Pin Configuration 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