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400ksps, +5V, 8-/4-Channel, 12-Bit ADCs with +2.5V Reference and Parallel Interface

Smallest, Low-Power, Parallel-Output 12-Bit ADCs

Product Details

Key Features

Parametric specs for Precision ADCs (< 5Msps)
Resolution (bits) (ADC) 12
# Input Channels 4
Conv. Rate (ksps) (max) 400
Data Bus µP/8
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 2.5
External VREF (V) (min) 1
External VREF (V) (max) 5.5
Unipolar VIN (V) (max) 2.5
Bipolar VIN (±V) (max) 1.25
INL (±LSB) 1
Package/Pins QSOP/24
Budgetary
Price (See Notes)
9.23
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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 4
Conv. Rate (ksps) (max) 400
Data Bus µP/8
ADC Architecture SAR
Diff/S.E. Input Both
Internal VREF (V) (nominal) 2.5
External VREF (V) (min) 1
External VREF (V) (max) 5.5
Unipolar VIN (V) (max) 2.5
Bipolar VIN (±V) (max) 1.25
INL (±LSB) 1
Package/Pins QSOP/24
Budgetary
Price (See Notes)
9.23

Key Features

  • 12-Bit Resolution, ±0.5 LSB Linearity
  • +5V Single-Supply Operation
  • User-Adjustable Logic Level (+2.7V to +5.5V)
  • Internal +2.5V Reference
  • Software-Configurable Analog Input Multiplexer
    • 8-Channel Single-Ended/4-Channel Pseudo-Differential (MAX1290)
    • 4-Channel Single-Ended/2-Channel Pseudo-Differential (MAX1292)
  • Software-Configurable Unipolar/Bipolar Analog Inputs
  • Low Current:
    • 2.5mA (400ksps)
    • 1.0mA (100ksps)
    • 400µA (10ksps)
    • 2µA (Shutdown)
  • Internal 6MHz Full-Power Bandwidth Track/Hold
  • Byte-Wide Parallel (8 + 4) Interface
  • Small Footprint:
    • 28-Pin QSOP (MAX1290)
    • 24-Pin QSOP (MAX1292)

Applications/Uses

  • Data Acquisition Systems
  • Data Logging
  • Energy Management
  • Industrial Controls Systems
  • Patient Monitoring
  • Touch Screens

Description

The MAX1290/MAX1292 low-power, 12-bit analog-to-digital converters (ADCs) feature a successive-approximation ADC, automatic power-down, fast wake-up (2µs), an on-chip clock, +2.5V internal reference, and a high-speed, byte-wide parallel interface. The devices operate with a single +5V analog supply and feature a VLOGIC pin that allows them to interface directly with a +2.7V to +5.5V digital supply.

Power consumption is only 10mW (VDD = VLOGIC) at a 400ksps max sampling rate. Two software-selectable power-down modes enable the MAX1290/MAX1292 to be shut down between conversions; accessing the parallel interface returns them to normal operation. Powering down between conversions can cut supply current to under 10µA at reduced sampling rates.

Both devices offer software-configurable analog inputs for unipolar/bipolar and single-ended/pseudo-differential operation. In single-ended mode, the MAX1290 has eight input channels and the MAX1292 has four input channels (four and two input channels, respectively, when in pseudo-differential mode).

Excellent dynamic performance and low power, combined with ease of use and small package size, make these converters ideal for battery-powered and data-acquisition applications or for other circuits with demanding power consumption and space requirements.

The MAX1290/MAX1292 tri-states active-low INT when active-low CS goes high. Refer to MAX1262/MAX1264 if tri-stating active-low INT is not desired.

The MAX1290 is available in a 28-pin QSOP package, while the MAX1292 comes in a 24-pin QSOP. For pin-compatible +3V, 12-bit versions, refer to the MAX1291/MAX1293 data sheet.

Simplified Block Diagram

MAX1290, MAX1292: Typical Operating Circuit MAX1290, MAX1292: 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 .