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MAX1081A, MAX1081B

300ksps/400ksps, Single-Supply, Low-Power, 8-Channel, Serial 10-Bit ADCs with Internal Reference

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

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Key Features

  • 8-Channel Single-Ended or 4-Channel
  • Pseudo-Differential Inputs
  • Internal Multiplexer and Track/Hold
  • Single-Supply Operation
    • +4.5V to +5.5V (MAX1080)
    • +2.7V to +3.6V (MAX1081)
  • Internal +2.5V Reference
  • 400ksps Sampling Rate (MAX1080)
  • Low Power: 2.5mA (400ksps)
    • 1.3mA (REDP)
    • 0.9mA (FASTPD)
    • 2µA (FULLPD)
  • SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire Serial Interface
  • Software-Configurable Unipolar or Bipolar Inputs
  • 20-Pin TSSOP Package

Applications/Uses

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

Description

The MAX1080/MAX1081 10-bit analog-to-digital converters (ADCs) combine an 8-channel analog-input multiplexer, high-bandwidth track/hold (T/H), and serial interface with high conversion speed and low power consumption. The MAX1080 operates from a single +4.5V to +5.5V supply; the MAX1081 operates from a single +2.7V to +3.6V supply. Both devices' analog inputs are software configurable for unipolar/bipolar and single-ended/pseudo-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 MAX1080/MAX1081 use an external serial-interface clock to perform successive-approximation analog-to-digital conversions. The devices feature an internal +2.5V reference and a reference-buffer amplifier with a ±1.5% voltage-adjustment range. An external reference with a 1V to VDD1 range may also be used.

The MAX1080/MAX1081 provide a hard-wired activel-low SHDN pin and four software-selectable power modes (normal operation, reduced power (REDP), fast power-down (FASTPD), and full power-down (FULLPD)). These devices can be programmed to automatically shut down at the end of a conversion or to operate with reduced power. When using the power-down modes, accessing the serial interface automatically powers up the devices, and the quick turn-on time allows them to be shut down between all conversions. This technique can cut supply current below 100mA at lower sampling rates.

The MAX1080/MAX1081 are available in a 20-pin TSSOP package. These devices are higher-speed versions of the MAX148/MAX149. For more information, refer to the respective data sheet.

Simplified Block Diagram

MAX1080, MAX1080A, MAX1080B, MAX1081, MAX1081A, MAX1081B: Typical Operating Circuit MAX1080, MAX1080A, MAX1080B, MAX1081, MAX1081A, MAX1081B: 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 .