Features and Benefits

  • 16-bit dual simultaneous sampling SAR ADC
  • Single-ended analog inputs
  • 4-channel with 2:1 multiplexers
  • Channel sequencer mode
  • Throughput rate
    • 1 MSPS (AD4684)
    • 500 kSPS (AD4685)
  • SNR (typical)
    • 87.5 dB with VREF = 3.3 V external
    • 93 dB with OSR_MODE = 1, OSR = 8, RES = 1, VREF = 2.5 V internal
  • On-chip oversampling functions
  • INL ±1.5 LSB (typical)
  • Resolution boost function
  • 2.5 V internal reference at 10 ppm/°C (maximum)
  • Alert function
  • −40°C to +125°C temperature range
  • 16-lead, 3 mm × 3 mm LFCSP

Product Details

The AD4684/AD4685 are 16-bit, dual, simultaneous sampling, high speed, successive approximation register (SAR), analog-to-digital converters (ADCs) that operate from a 3.0 V to 3.6 V power supply and feature throughput rates of up to 1 MSPS for the AD4684 and 500 kSPS for the AD4685. The analog input types are single-ended and are sampled and converted on the falling edge of CS.

The AD4684/AD4685 have an on-chip sequencer and integrated on-chip oversampling block to improve dynamic range and reduce noise at lower bandwidths. A buffered internal 2.5 V reference is included. Alternatively, an external reference up to 3.3 V can be used. The conversion process and data acquisition use standard control inputs, allowing interfacing to microprocessors or digital signal processors (DSPs). The AD4684/AD4685 is compatible with 1.8 V, 2.5 V, and 3.3 V interfaces by using the separate logic supply. The AD4684/AD4685 are available in a 16-lead, 3 mm × 3 mm lead frame chip scale package (LFCSP) with operation specified from −40°C to +125°C.


  1. 4-channel, dual simultaneous sampling ADC.
  2. Pin-compatible product family.
  3. High throughput rate: 1 MSPS (AD4684) and 500 kSPS (AD4685).
  4. Space-saving, 16-lead, 3 mm × 3 mm LFCSP.
  5. Integrated oversampling block to increase dynamic range and SNR and to reduce SCLK speed requirements.
  6. Single-ended analog inputs.
  7. Small sampling capacitor reduces amplifier drive burden.



  • Motor control position feedback
  • Motor control current sense
  • Sonars
  • Power quality
  • Data acquisition systems
  • Erbium doped fiber amplifier (EDFA) applications
  • Inphase and quadrature demodulation

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, ADI recommends utilization of these products.

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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.