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Low-Power, 12-Bit Sampling ADC with Internal Reference and Power-Down

See MAX129X Family for New Designs

Product Details

Key Features

Parametric specs for Precision ADCs (< 5Msps)
Resolution (bits) (ADC) 12
# Input Channels 1
Conv. Rate (ksps) (max) 100
Data Bus µP/8
SPI
ADC Architecture SAR
Diff/S.E. Input Diff. Only
Internal VREF (V) (nominal) 4.096
External VREF (V) (min) 2.5
External VREF (V) (max) 5
Unipolar VIN (V) (max) 4.096
INL (±LSB) 1
Package/Pins PDIP/24
SOIC (W)/24
Budgetary
Price (See Notes)
13.95
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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 1
Conv. Rate (ksps) (max) 100
Data Bus µP/8
SPI
ADC Architecture SAR
Diff/S.E. Input Diff. Only
Internal VREF (V) (nominal) 4.096
External VREF (V) (min) 2.5
External VREF (V) (max) 5
Unipolar VIN (V) (max) 4.096
INL (±LSB) 1
Package/Pins PDIP/24
SOIC (W)/24
Budgetary
Price (See Notes)
13.95

Key Features

  • 12-Bit Resolution, 1/2 LSB Linearity
  • +5V or ±5V Operation
  • Built-In Track/Hold
  • Internal Reference with Adjustment Capability
  • Low Power:
    • 3mA Operating Mode
    • 20µA Power-Down Mode
  • 100ksps Tested Sampling Rate
  • Serial and 8-Bit Parallel µP Interface
  • 24-Pin Narrow DIP and Wide SO Packages

Applications/Uses

  • Automated Test Equipment (ATE)
  • Battery-Powered Data Logging
  • Data Acquisition
  • Digital Signal Processing (DSP)
  • Electromechanical Systems
  • High-Accuracy Process Control
  • PC Pen Digitizers
  • Telecommunications

Description

The MAX191 is a monolithic, CMOS, 12-bit analog-to-digital converter (ADC) featuring differential inputs, track/hold (T/H), internal voltage reference, internal or external clock, and parallel or serial µP interface. The MAX191 has a 7.5µs conversion time, a 2µs acquisition time, and a guaranteed 100ksps sample rate.

The MAX191 operates from a single +5V supply or from dual ±5V supplies, allowing ground-referenced bipolar input signals. The device features a logic power-down input, which reduces the 3mA VDD supply current to 50µA max, including the internal-reference current.

Decoupling capacitors are the only external components needed for the power supply and reference. This ADC operates with either an external reference, or an internal reference that features an adjustment input for trimming system gain errors.

The MAX191 provides three interface modes: two 8-bit parallel modes, and a serial interface mode that is compatible with SPI™, QSPI™, and MICROWIRE™ serial-interface standards.

Simplified Block Diagram

MAX191: Functional Diagram MAX191: Functional Diagram 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 .