Top

+2.7V, Low-Power, 8-Channel, Serial 12-Bit ADCs

Product Details

The MAX146/MAX147 12-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX146 operates from a single +2.7V to +3.6V supply; the MAX147 operates from a single +2.7V to +5.25V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.

The 4-wire serial interface connects directly to SPI™/ QSPI™ and MICROWIRE™ devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX146/MAX147 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.

The MAX146 has an internal 2.5V reference, while the MAX147 requires an external reference. Both parts have a reference-buffer amplifier with a ±1.5% voltage-adjustment range.

These devices provide a hard-wired SHDN-bar pin and a software-selectable power-down, and can be programmed to automatically shut down at the end of a conversion. Accessing the serial interface automatically powers up the MAX146/MAX147, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60µA at reduced sampling rates.

The MAX146/MAX147 are available in 20-pin DIP and SSOP packages.

For 4-channel versions of these devices, see the MAX1246/MAX1247 data sheet.

Key Features

  • 8-Channel Single-Ended or 4-Channel Differential Inputs
  • Single-Supply Operation
    • +2.7V to +3.6V (MAX146)
    • +2.7V to +5.25V (MAX147)
  • Internal 2.5V Reference (MAX146)
  • Low Power
    • 1.2mA (133ksps, 3V supply)
    • 54µA (1ksps, 3V supply)
    • 1µA (power-down mode)
  • SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface
  • Software-Configurable Unipolar or Bipolar Inputs
  • 20-Pin DIP/SSOP Packages

Applications/Uses

  • Battery-Powered Applications
  • Data Acquisition
  • Medical Instruments
  • Pen Digitizers
  • Portable Data Logging
  • Process Control
Parametric specs for Precision ADCs (< 5Msps)
Resolution (bits) (ADC) 12
# Input Channels 8
Conv. Rate (ksps) (max) 133
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 2.5
External VREF (V) (min) 1
External VREF (V) (max) 3.6
Unipolar VIN (V) (max) 2.5
Bipolar VIN (±V) (max) 1.25
INL (±LSB) 1
Package/Pins PDIP/20
SSOP/20
Budgetary
Price (See Notes)
$9.49 @1k
View More

Simplified Block Diagram

MAX146, MAX147: Typical Operating Circuit MAX146, MAX147: Typical Operating Circuit Zoom icon

Technical Docs

Design & Development

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

Description

The MAX147 evaluation system (EV system) is a complete, low-cost, 8-channel data-acquisition system consisting of a MAX147 evaluation kit (EV kit) and a Maxim 68HC16 or 80C32 microcontroller (µC) module. IBM® PC-compatible software provides a handy user interface to exercise the MAX147's features. Source code is provided.

Order the EV system for comprehensive evaluation of the MAX147 using a personal computer. Order the EV kit if the 68HC16 or 80C32 µC module was purchased previously with another Maxim EV system, or for custom use in other µC-based systems.

The MAX147 EV kit evaluates both the MAX147 and the MAX146. To evaluate the MAX146, order a free sample of the MAX146BCPP along with the MAX147 EV kit.

View Details

Features

  • Proven PC Board Layout
  • Complete Evaluation System
  • Convenient Test Points Provided On-Board
  • Data-Logging Software
  • Source Code Provided
  • Fully Assembled and Tested

Description

The MAX147 evaluation system (EV system) is a complete, low-cost, 8-channel data-acquisition system consisting of a MAX147 evaluation kit (EV kit) and a Maxim 68HC16 or 80C32 microcontroller (µC) module. IBM® PC-compatible software provides a handy user interface to exercise the MAX147's features. Source code is provided.

Order the EV system for comprehensive evaluation of the MAX147 using a personal computer. Order the EV kit if the 68HC16 or 80C32 µC module was purchased previously with another Maxim EV system, or for custom use in other µC-based systems.

The MAX147 EV kit evaluates both the MAX147 and the MAX146. To evaluate the MAX146, order a free sample of the MAX146BCPP along with the MAX147 EV kit.

View Details

Features

  • Proven PC Board Layout
  • Complete Evaluation System
  • Convenient Test Points Provided On-Board
  • Data-Logging Software
  • Source Code Provided
  • Fully Assembled and Tested

/en/design/design-tools/ee-sim.html?

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) 12
# Input Channels 8
Conv. Rate (ksps) (max) 133
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 2.5
External VREF (V) (min) 1
External VREF (V) (max) 3.6
Unipolar VIN (V) (max) 2.5
Bipolar VIN (±V) (max) 1.25
INL (±LSB) 1
Package/Pins PDIP/20
SSOP/20
Budgetary
Price (See Notes)
$9.49 @1k

Key Features

  • 8-Channel Single-Ended or 4-Channel Differential Inputs
  • Single-Supply Operation
    • +2.7V to +3.6V (MAX146)
    • +2.7V to +5.25V (MAX147)
  • Internal 2.5V Reference (MAX146)
  • Low Power
    • 1.2mA (133ksps, 3V supply)
    • 54µA (1ksps, 3V supply)
    • 1µA (power-down mode)
  • SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface
  • Software-Configurable Unipolar or Bipolar Inputs
  • 20-Pin DIP/SSOP Packages

Applications/Uses

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

Description

The MAX146/MAX147 12-bit data-acquisition systems combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and low power consumption. The MAX146 operates from a single +2.7V to +3.6V supply; the MAX147 operates from a single +2.7V to +5.25V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.

The 4-wire serial interface connects directly to SPI™/ QSPI™ and MICROWIRE™ devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX146/MAX147 use either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.

The MAX146 has an internal 2.5V reference, while the MAX147 requires an external reference. Both parts have a reference-buffer amplifier with a ±1.5% voltage-adjustment range.

These devices provide a hard-wired SHDN-bar pin and a software-selectable power-down, and can be programmed to automatically shut down at the end of a conversion. Accessing the serial interface automatically powers up the MAX146/MAX147, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current to under 60µA at reduced sampling rates.

The MAX146/MAX147 are available in 20-pin DIP and SSOP packages.

For 4-channel versions of these devices, see the MAX1246/MAX1247 data sheet.

Simplified Block Diagram

MAX146, MAX147: Typical Operating Circuit MAX146, MAX147: 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