Overview

Features and Benefits

  • 11-Bit Resolution Analog-to-Digital Converter
  • Seven Single-Ended Analog Inputs
    Four Input Channels Simultaneously Sampled
    Expansion with 4 Multiplexed Inputs
  • Internal 2.5 V Reference
  • 3.2 µs Conversion Time per Channel
  • User Definable Channel Sequencing
  • Single Supply +5 V Operation
  • Double Buffered Register Outputs
  • 6.25 MHz to 12.5 MHz Operating Clock Range

Product Details

The AD7861 is a multichannel simultaneous sampling A/D Converter (ADC) configured for the acquisition of voltage inputs in a motor control solution or three-phase power system.

The AD7861 combined with Analog Devices’ 16-bit fixed-point digital signal processor (DSP) provides a low cost 16-bit fixed-point microcontroller solution. The input stage has been designed to accommodate the types of signals frequently found in motor drives. The VIN1, VIN2, and VIN3 channels are simultaneously sampled inputs suitable for stator current acquisition. The AUX0–AUX3 channels are multiplexed and are suitable for slower moving inputs such as temperature and bus voltage of the diode rectifier output in a motor control application.

APPLICATIONS

  • Motor Control
  • 3-Phase Power Measurement
  • Cellular Phones
  • Data Acquisition

PRODUCT HIGHLIGHTS

  1. Simultaneous Sampling of Four Inputs
    Four channel sample and hold amplifier (SHA) allows out of phase input signals to be sampled simultaneously, preserving the relative phase information. Sample-and-hold acquisition time is 1.6 µs and conversion time per channel is 3.2 µs (using a 12.5 MHz system clock).
  2. Flexible Analog Channel Sequencing
    AD7861 supports acquisition of 2, 3 or 4 channels per group. Converted channel results are stored in registers and the data can be read in any order. The sampling and conversion time for two channels is 8 µs, three channels is 11.2 µs, and four channels is 14.4 µs (using a 12.5 MHz system clock).
  3. Single 5 V dc Operation
    Low power, digital process.

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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