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+5V, Low-Power, Multichannel, Serial 8-Bit ADCs

Lowest-Power 8-Bit 4/8-Channel ADCs Have Internal Reference

Product Details

Key Features

Applications/Uses

Parametric specs for Precision ADCs (< 5Msps)
Resolution (bits) (ADC) 8
# Input Channels 8
Conv. Rate (ksps) (max) 50
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 4.096
External VREF (V) (min) 1
External VREF (V) (max) 5.5
Unipolar VIN (V) (max) 4.096
Bipolar VIN (±V) (max) 2.048
INL (±LSB) 0.1
Package/Pins SSOP/20
Budgetary
Price (See Notes)
2.17
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Simplified Block Diagram

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Parameters

Parametric specs for Precision ADCs (<u><</u> 5Msps)
Resolution (bits) (ADC) 8
# Input Channels 8
Conv. Rate (ksps) (max) 50
Data Bus SPI
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 4.096
External VREF (V) (min) 1
External VREF (V) (max) 5.5
Unipolar VIN (V) (max) 4.096
Bipolar VIN (±V) (max) 2.048
INL (±LSB) 0.1
Package/Pins SSOP/20
Budgetary
Price (See Notes)
2.17

Key Features

  • 4.5V to 5.5V Single Supply
  • Low Power:
    • 135µA at 50ksps
    • 13µA at 1ksps
  • 8-Channel Single-Ended or 4-Channel Differential Inputs (MAX1112)
  • 4-Channel Single-Ended or 2-Channel Differential Inputs (MAX1113)
  • Internal Track/Hold; 50kHz Sampling Rate
  • Internal 4.096V Reference
  • SPI/QSPI/MICROWIRE-Compatible Serial Interface
  • Software-Configurable Unipolar or Bipolar Inputs
  • Total Unadjusted Error:
    • ±1 LSB (max)
    • ±0.3 LSB (typ)

Applications/Uses

  • 4mA- to 20mA-Powered Remote Data-Acquisition Systems
  • Battery-Powered Applications
  • System Diagnostics
  • Touch-Screen Applications

Description

The MAX1112/MAX1113 low-power, 8-bit, 8-channel analog-to-digital converters (ADCs) feature an internal track/hold, voltage reference, clock, and serial interface. They operate from a single 4.5V to 5.5V supply and consume only 135μA while sampling at rates up to 50ksps. The MAX1112's 8 analog inputs and the MAX1113's 4 analog inputs are software-configurable, allowing unipolar/bipolar and single-ended/differential operation.

Successive-approximation conversions are performed using either the internal clock or an external serial-interface clock. The full-scale analog input range is determined by the 4.096V internal reference, or by an externally applied reference ranging from 1V to VDD. The 4-wire serial interface is compatible with the SPI™, QSPI™, and MICROWIRE™ serial-interface standards. A serial-strobe output provides the end-of-conversion signal for interrupt-driven processors.

The MAX1112/MAX1113 have a software-programmable, 2µA automatic power-down mode to minimize power consumption. Using power-down, the supply current is reduced to 13µA at 1ksps, and only 82µA at 10ksps. Power-down can also be controlled using the active-low SHDN input pin. Accessing the serial interface automatically powers up the device.

The MAX1112 is available in a 20-pin SSOP package. The MAX1113 is available in a small 16-pin QSOP package.

Simplified Block Diagram

MAX1112, MAX1113: Typical Operating Circuit MAX1112, MAX1113: 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 .