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Dual, 12-Bit, 1.25Msps, Simultaneous-Sampling ADCs with Serial Interface

12-Bit ADC is Ideal for Motor Control with No Pipeline Delay

Product Details

Key Features

Applications/Uses

Parametric specs for Precision ADCs (< 5Msps)
Resolution (bits) (ADC) 12
# Input Channels 4
Conv. Rate (ksps) (max) 1250
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) 5.25
Unipolar VIN (V) (max) 2.048
Bipolar VIN (±V) (max) 1.024
INL (±LSB) 1.25
Package/Pins TQFN/20
Budgetary
Price (See Notes)
$3.38 @1k
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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) 1250
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) 5.25
Unipolar VIN (V) (max) 2.048
Bipolar VIN (±V) (max) 1.024
INL (±LSB) 1.25
Package/Pins TQFN/20
Budgetary
Price (See Notes)
$3.38 @1k

Key Features

  • Dual, Simultaneous-Sampling, 12-Bit Successive Approximation Register (SAR) ADCs
  • 2 x 2 Mux Inputs or Two Differential Inputs
  • 1.25Msps Sampling Rate per ADC
  • Internal or External Reference
  • Excellent Dynamic Performance
    • 70dB SINAD (MAX1377)
    • 71dB SINAD (MAX1379/MAX1383)
    • 84dBc/SFDR
    • 1MHz Full-Linear Bandwidth
  • 2.7V to 3.6V Low-Power Operation (MAX1377)
    • 50mW (Normal Operation)
    • 6mW (Partial Power-Down)
    • 3µW (Full Power-Down)
  • 4.75V to 5.25V Low-Power Operation (MAX1379)
    • 90mW (Normal Operation)
    • 10mW (Partial Power-Down)
    • 5µW (Full Power-Down)
  • 4.75V to 5.25V Low-Power Operation (MAX1383)
    • 280mW (Normal Operation)
    • 2.5µW (Full Power-Down)
  • 20MHz, SPI-Compatible, 3-Wire Serial Interface User-Selectable Single (0.625Msps max) or Dual Outputs (1.25Msps max)
  • Input Range: ±10V (MAX1383), 0—VREF or ±VREF/2 (MAX1377/MAX1379)
  • Small 20-Pin TQFN Package

Applications/Uses

  • Bill Validation
  • Communications
  • Data Acquisition
  • Motor Control
  • Portable Instruments

Description

The MAX1377/MAX1379/MAX1383 feature two simultaneous-sampling, low-power, 12-bit ADCs with serial interface and internal voltage reference. Fast sampling rate, low power dissipation, and excellent dynamic performance make the MAX1377/MAX1379/MAX1383 ideal for industrial process control, motor control, and RF applications.

Conversion results are available through a SPI™-/QSPI™-/MICROWIRE™-/DSP-compatible interface with independent serial digital outputs for each channel. The serial outputs allow twice as much data to be transferred at the given clock rate. The conversion results for both ADCs can also be output on a single digital output for microcontrollers (µCs) and DSPs with only a single serial input available.

The MAX1377 operates from a 2.7V to 3.6V analog supply and the MAX1379/MAX1383 operate from a 4.75V to 5.25V analog supply. A separate 1.8V to AVDD digital supply allows interfacing to low voltage logic without the use of level translators.

Two power-down modes, partial and full, allow the MAX1377/MAX1379 and MAX1383 (full power-down only) to save power between conversions. Partial power-down mode reduces the supply current to 2mA while leaving the reference enabled for quick power-up. Full powerdown mode reduces the supply current to 1µA.

The MAX1377/MAX1379 inputs accept voltages between zero and the reference voltage or ±VREF/2. The MAX1383 offers an input voltage range of ±10V, which is ideal for industrial and motor-control applications. The input to each of the ADCs supports either a true-differential input or two single-ended inputs.

The MAX1377/MAX1379/MAX1383 are available in a 20-pin TQFN package, and are specified for the automotive (-40°C to +125°C) temperature range.

Simplified Block Diagram

MAX1377, MAX1379, MAX1383: Functional Diagram MAX1377, MAX1379, MAX1383: 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 .