Overview

Features and Benefits

  • Easy Drive
    • Greatly reduced input kickback
      • Input current reduced to 0.5 μA/MSPS
    • Enhanced acquisition phase, ≥77% of cycle time at 1 MSPS 
    • First conversion accurate, no latency or pipeline delay
    • Input span compression for single-supply operation
    • Fast conversion allows low SPI clock rates
    • Input overvoltage clamp protection sinks up to 50 mA
    • SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface
  • High performance
    • Differential analog input range: ±VREF, VREF from 2.4 V to 5.1 V
    • Throughput: 1 MSPS
    • INL: ±3.1 ppm maximum
    • Guaranteed 20-bit no missing codes
    • SNR: 100.5 dB at fIN = 1 kHz at VREF = 5 V
    • THD: −123 dB at fIN = 1 kHz, −100 dB at fIN = 100 kHz
    • SINAD: 89.5 dB at fIN = 500 kHz (see Figure 17)
  • Oversampled dynamic range
    • 104 dB for OSR = 2
    • 131 dB for OSR = 1024
  • Low power
  • Single 1.8 V supply operation with 1.71 V to 5.5 V logic interface
    • 5.1 mW at 1 MSPS (VDD only)
    • 83 μW at 10 kSPS, 8.3 mW at 1 MSPS (total power)
  • 10-lead packages: 3 mm × 3 mm LFCSP, 3 mm × 4.90 mm MSOP
  • Guaranteed operation: −40°C to +125°C

Product Details

The AD4021 is a high accuracy, high speed, low power, 20-bit, Easy Drive, precision successive approximation register (SAR) analog-to-digital (ADC) that operates from a single power supply, VDD. The reference voltage, VREF, is applied externally and can be set independent of the supply voltage. The AD4021 power scales linearly with throughput.

Easy Drive features reduce both signal chain complexity and power consumption while enabling higher channel density. The reduced input current, particularly in high-Z mode, coupled with a long signal acquisition phase, eliminates the need for a dedicated ADC driver. Easy Drive broadens the range of companion circuitry that is capable of driving these ADCs (see Figure 2).

Input span compression eliminates the need to provide a negative supply to the ADC driver amplifier while preserving access to the full ADC code range. The input overvoltage clamp protects the ADC inputs against overvoltage events, minimizing disturbances on the reference pin, and eliminating the need for external protection diodes. 

Fast device throughput up to 1 MSPS allows users to accurately capture high frequency signals and to implement oversampling techniques to alleviate the challenges associated with antialias filter designs. Decreased serial peripheral interface (SPI) clock rate requirements reduce digital input/output power consumption, broadens digital host options, and simplifies the task of sending data across digital isolation. The SPI-compatible serial user interface is compatible with 1.8 V, 2.5 V, 3 V, and 5 V logic by using the separate VIO logic supply.

Applications

  • Automatic test equipment
  • Machine automation
  • Medical equipment
  • Battery-powered equipment
  • Precision data acquisition systems
  • Instrumentation and control systems

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, manbetx体育 recommends utilization of these products.

Evaluation Kits (1)

Software & Systems Requirements

Tools & Simulations

IBIS Models

AD4000 Series IBIS Models

Design Tools

Use the Precision ADC Driver Tool to simulate the performance of precision ADC and driver combinations.

Product Recommendations

AD4021 Companion Parts

Recommended Driver Amplifiers

Recommended External Voltage References

Recommended Digital Isolators

  • For SPI Interface, low power, high-speed 3/3.5 kVrms isolation: ADUM141D, ADUM141E.

Recommended Low Dropout Regulators and Switchers

Design Resources

manbetx体育 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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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.