Alternative Parts


Features and Benefits

  • 2.5 V Internal Reference: 
    Typical Drift 3 ppm/°C
    - Guaranteed Max Drift: 15 ppm/°C
  • Throughput: 100 kSPS
  • INL: ±2.5 LSB Max (±0.0038% of Full Scale)
  • 16 Bits Resolution with No Missing Codes
  • S/(N+D): 88 dB max @ 20 kHz; THD: -96 dB max @ 20 kHz
  • Analog Input Voltage Range: 0 V to 2.5 V
  • No Pipeline Delay
  • Parallel and Serial 5 V/3 V Interface
  • Single 5 V Supply Operation
  • Package:
    48-Lead Quad Flat Pack (LQFP)
    48-Lead Chip Scale Package (LFCSP)
    Pin-to-Pin Compatible with 
    PulSAR® ADCs
  • See datasheet for additional features

Product Details

The AD7661 is a 16-bit, 100 kSPS, charge redistribution SAR analog-to-digital converter that operates from a single 5 V power supply. The part contains a high speed 16-bit sampling ADC, an internal conversion clock, internal reference, error correction circuits, and both serial and parallel system interface ports. The AD7661 is hardware factory-calibrated and comprehensively tested to ensure ac parameters such as signal-to-noise ratio (SNR) and total harmonic distortion (THD), in addition to the more traditional dc parameters of gain, offset, and linearity.

The AD7661 is available in a 48-lead LQFP and a tiny 48-lead LFCSP with operation specified from –40°C to +85°C.


  1. Fast Throughput.
    The AD7661 is a 100 kSPS, charge redistribution, 16-bit SAR ADC with internal error correction circuitry.
  2. Superior INL.
    The AD7661 has a maximum integral nonlinearity of 2.5 LSB with no missing 16-bit codes.
  3. Internal Reference.
    The AD7661 has an internal reference with a typical temperature drift of 3 ppm/°C.
  4. Single-Supply Operation.
    The AD7661 operates from a single 5 V supply. Its power dissipation decreases with throughput.
  5. Serial or Parallel Interface.
    Versatile parallel or 2-wire serial interface arrangement is compatible with both 3 V and 5 V logic. 


  • Data acquisition
  • Medical instruments
  • Digital signal processing
  • Spectrum analysis
  • Instrumentation
  • Battery-powered systems
  • Process control

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.

Evaluation Kits (1)

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.

PCN-PDN Information

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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.