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Low-Power, 8-Channel, Serial 12-Bit ADCs

Low-Power, Single-Ended or Differential Multi-Channel, 12-Bit ADC with Bipolar Input Capabilities

Product Details

Key Features

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) 4.096
External VREF (V) (min) 2.5
External VREF (V) (max) 5.25
Unipolar VIN (V) (max) 4.096
Bipolar VIN (±V) (max) 2.048
Package/Pins PDIP/20
SOIC (W)/20
SSOP/20
Budgetary
Price (See Notes)
13.26
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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) 133
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 4.096
External VREF (V) (min) 2.5
External VREF (V) (max) 5.25
Unipolar VIN (V) (max) 4.096
Bipolar VIN (±V) (max) 2.048
Package/Pins PDIP/20
SOIC (W)/20
SSOP/20
Budgetary
Price (See Notes)
13.26

Key Features

  • 8-Channel Single-Ended or 4-Channel Differential Inputs
  • Single +5V or ±5V Operation
  • Low Power:
    • 1.5mA (Operating Mode)
    • 2µA (Power-Down Mode)
  • Internal Track/Hold, 133kHz Sampling Rate
  • Internal 4.096V Reference (MAX186)
  • SPI-/QSPI-/MICROWIRE-/TMS320-Compatible 4-Wire Serial Interface
  • Software-Configurable Unipolar or Bipolar Inputs
  • 20-Pin PDIP, SO, SSOP Packages
  • Evaluation Kit Available

Applications/Uses

  • Automated Test Equipment (ATE)
  • Battery-Powered Applications
  • Data Acquisition
  • High-Accuracy Process Control
  • Medical Instruments
  • Portable Data Logging
  • Robotics

Description

The MAX186/MAX188 are 12-bit data-acquisition systems that combine an 8-channel multiplexer, high-bandwidth track/hold, and serial interface together with high conversion speed and ultra-low power consumption. The devices operate with a single +5V supply or dual ±5V supplies. The 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 MAX186/MAX188 use either the internal clock or an external serial-interface clock to perform successive-approximation A/D conversions. The serial interface can operate beyond 4MHz when the internal clock is used.

The MAX186 has an internal 4.096V reference while the MAX188 requires an external reference. Both parts have a reference-buffer amplifier that simplifies gain trim.

The MAX186/MAX188 provide a hard-wired active-low SHDN pin and two software-selectable power-down modes. Accessing the serial interface automatically powers up the devices, and the quick turn-on time allows the MAX186/MAX188 to be shut down between every conversion. Using this technique of powering down between conversions, supply current can be cut to under 10µA at reduced sampling rates.

The MAX186/MAX188 are available in 20-pin PDIP and SO packages, and in a shrink small-outline package (SSOP), that occupies 30% less area than an 8-pin PDIP. For applications that call for a parallel interface, see the MAX180/MAX181 data sheet. For anti-aliasing filters, consult the MAX274/MAX275 data sheet.

Simplified Block Diagram

MAX186, MAX188: Typical Operating Circuit MAX186, MAX188: 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 .