MAX125

2x4-Channel, Simultaneous-Sampling, 14-Bit DAS

First 14-Bit, 8-Channel, Simultaneous-Sampling ADC for Industrial Applications


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Description

The MAX125/MAX126 are high-speed, multichannel, 14-bit data-acquisition systems (DAS) with simultaneous track/holds (T/Hs). These devices contain a 14-bit, 3µs, successive-approximation analog-to-digital converter (ADC), a +2.5V reference, a buffered reference input, and a bank of four simultaneous-sampling T/H amplifiers that preserve the relative phase information of the sampled inputs. The MAX125/MAX126 have two multiplexed inputs for each T/H, allowing a total of eight inputs. In addition, the converter is overvoltage tolerant to ±17V; a fault condition on any channel will not harm the IC. Available input ranges are ±5V (MAX125) and ±2.5V (MAX126).

An on-board sequencer converts one to four channels per active-low CONVST pulse. In the default mode, one T/H output (CH1A) is converted. An interrupt signal (active-low INT) is provided after the last conversion is complete. Convert two, three, or four channels by reprogramming the MAX125/MAX126 through the bidirectional parallel interface. Once programmed, the MAX125/MAX126 continue to convert the specified number of channels per active-low CONVST pulse until they are reprogrammed. The channels are converted sequentially, beginning with CH1. The INT signal always follows the end of the last conversion in a conversion sequence. The ADC converts each assigned channel in 3µs and stores the result in an internal 14x4 RAM. Upon completion of the conversions, data can be accessed by applying successive pulses to the active-low RD pin. Four successive reads access four data words sequentially.

The parallel interface's data-access and bus-release timing specifications are compatible with most popular digital signal processors and 16-bit/32-bit microprocessors, so the MAX125/MAX126 conversion results can be accessed without resorting to wait states.
MAX125, MAX126: Typical Operating Circuit MAX125, MAX126: Typical Operating Circuit Enlarge+

Key Features

  • Four Simultaneous-Sampling T/H Amplifiers with Two Multiplexed Inputs (eight single-ended inputs total)
  • 3µs Conversion Time per Channel
  • Throughput:
    • 250ksps (1 channel)
    • 142ksps (2 channels)
    • 100ksps (3 channels)
    • 76ksps (4 channels)
  • Input Range:
    • ±5V (MAX125)
    • ±2.5V (MAX126)
  • Fault-Protected Input Multiplexer (±17V)
  • ±5V Supplies
  • Internal +2.5V or External Reference Operation
  • Programmable On-Board Sequencer
  • High-Speed Parallel DSP Interface

Applications/Uses

  • Digital Signal Processing (DSP)
  • Multiphase Motor Control
  • Power-Factor Monitoring
  • Power-Grid Synchronization
  • Vibration and Waveform Analysis
Part NumberResolution
(bits)
Input Chan.Conv. Rate
(ksps)
ADC ArchitectureData BusDiff/S.E. InputInternal VREF
(V)
External VREF
(V)
External VREF
(V)
Bipolar VIN
(±V)
SNR
(dB)
THD
(dB)
INL
(±LSB)
Package/PinsBudgetary
Price
ADCmaxnominalminmaxmaxSee Notes
MAX125 148250SARµP/14S.E. Only2.52.252.75575-892
SSOP/36
$18.23 @1k
MAX126 2.5
SSOP/36
$19.17 @500
See All Precision ADCs (< 5Msps) (444)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX125EVKIT: Evaluation Kit for the MAX125 and MAX126
MAX126EVKIT: Evaluation Kit for the MAX125 and MAX126

Technical Documents

App Note 1138 Practical Data Acquisition using a Windows¹-based Power Meter
App Note 290 ADCs for Simultaneous Sampling

Quality and Environmental Data

Product Reliability Reports: MAX125.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX125CCAX+D
  • MAX125CCAX+TD
  • MAX125CEAX+D
  • MAX125CEAX+TD
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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    Related Resources


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