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+2.375V, Low-Power, 8-Channel, Serial 12-Bit ADC

Ideal for Portable 2.5V 12-Bit Systems

Product Details

Key Features

Parametric specs for Precision ADCs (< 5Msps)
Resolution (bits) (ADC) 12
# Input Channels 8
Conv. Rate (ksps) (max) 100
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 2.048
External VREF (V) (min) 1
External VREF (V) (max) 3.3
Unipolar VIN (V) (max) 2.048
Bipolar VIN (±V) (max) 1.024
INL (±LSB) 1
Package/Pins SSOP/20
Budgetary
Price (See Notes)
15.13
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Simplified Block Diagram

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Parameters

Parametric specs for Precision ADCs (<u><</u> 5Msps)
Resolution (bits) (ADC) 12
# Input Channels 8
Conv. Rate (ksps) (max) 100
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 2.048
External VREF (V) (min) 1
External VREF (V) (max) 3.3
Unipolar VIN (V) (max) 2.048
Bipolar VIN (±V) (max) 1.024
INL (±LSB) 1
Package/Pins SSOP/20
Budgetary
Price (See Notes)
15.13

Key Features

  • Single +2.375V to +3.3V Operation
  • 8-Channel Single-Ended or 4-Channel Differential Analog Inputs
  • Low Power:
    • 0.8mA (100ksps)
    • 10µA (1ksps)
    • 1µA (power-down mode)
  • Internal Track/Hold, 100kHz Sampling Rate
  • 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
  • Portable Data Logging

Description

The MAX1245 12-bit data-acquisition system combines an 8-channel multiplexer, high-bandwidth track/hold, and serial interface with high conversion speed and ultra-low power consumption. It operates from a single +2.375V to +3.3V supply, and its analog inputs are software configurable for unipolar/bipolar and single-ended/differential operation.

The 4-wire serial interface directly connects to SPI™, QSPI™, and MICROWIRE™ devices without external logic. A serial strobe output allows direct connection to TMS320-family digital signal processors. The MAX1245 works with an external reference, and uses either the internal clock or an external serial-interface clock to perform successive-approximation analog-to-digital conversions.

This device provides a hard-wired active-low SHDN 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 powers up the MAX1245, and the quick turn-on time allows it to be shut down between conversions. This technique can cut supply current to under 10µA at reduced sampling rates.

The MAX1245 is available in a 20-pin DIP package and an SSOP that occupies 30% less area than an 8-pin DIP. For supply voltages from +2.7V to +5.25V, use the pin-compatible MAX147.

Simplified Block Diagram

MAX1245: Typical Operating Circuit MAX1245: 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 .