1. Products
  2. A/D Converters (ADC)
  3. High Speed A/D Converters >10 MSPS
  4. Standard High Speed A/D Converters
  5. AD9238


Features and Benefits

  • Integrated dual 12-bit ADC
  • Single 3 V supply operation (2.7 V to 3.6 V)
  • SNR = 70 dB (to Nyquist, AD9238-65)
  • SFDR = 80.5 dBc (to Nyquist, AD9238-65)
  • Low power: 300 mW/channel at 65 MSPS
  • Differential input with 500 MHz, 3 dB bandwidth
  • Exceptional crosstalk immunity > 85 dB
  • Flexible analog input: 1 V p-p to 2 V p-p range
  • Offset binary or twos complement data format
  • Clock duty cycle stabilizer
  • Output datamux option

Product Details

The AD9238 is a dual, 3 V, 12-bit, 20/40/65 MSPS analog to digital converter. It features dual high performance sample-and-hold amplifiers and an integrated voltage reference. The AD9238 uses a multistage differential pipelined architecture with output error correction logic to provide 12-bit accuracy and guarantee no missing codes over the full operating temperature range at up to 65 MSPS data rates.

The wide bandwidth, differential SHA allows for a variety of user-selectable input ranges and offsets including single-ended applications. It is suitable for various applications including multiplexed systems that switch full-scale voltage levels in successive channels and for sampling inputs at frequencies well beyond the Nyquist rate. The AD9238 is suitable for applications in communications, imaging and medical ultrasound.

Dual single-ended independent clock inputs are used to control all internal conversion cycles. A Duty Cycle Stabilizer (DCS) is available on the AD9238-65 and can compensate for wide variations in the clock duty cycle, allowing the converters to maintain excellent performance. The digital output data is presented in either straight binary or twos complement format. Out-of-range signals indicate an overflow condition, which can be used with the most significant bit to determine low or high overflow.

Fabricated on an advanced CMOS process, the AD9238 is available in either a space saving 64-pin LQFP or 64-pin LF-CSP and is specified over the industrial temperature range (-40°C to +85°C).


  1. Pin-compatible with the AD9248, 14-bit 20MSPS/ 40 MSPS/65 MSPS ADC.
  2. Speed grade options of 20 MSPS, 40 MSPS, and 65 MSPS allow flexibility between power, cost, and performance to suit an application.
  3. Low power consumption: AD9238-65: 65 MSPS = 600 mW, AD9238-40: 40 MSPS = 330 mW, and AD9238-20: 20 MSPS = 180 mW.
  4. Typical channel isolation of 85 dB at fIN = 10 MHz.
  5. The clock duty cycle stabilizer (AD9238-20/AD9238-40/ AD9238-65) maintains performance over a wide range of clock duty cycles.
  6. Multiplexed data output option enables single-port operation from either Data Port A or Data Port B.


  • Ultrasound equipment
  • Direct conversion or IF sampling receivers
    • WB-CDMA, CDMA2000, WiMAX
  • Battery-powered instruments
  • Hand-held scopemeters
  • Low cost, digital oscilloscopes

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)

Documentation & Resources

  • View All (23)
  • Data Sheets (1)
  • Application Notes (17)
  • Technical Articles (5)
  • Application Notes

    Tools & Simulations

    Virtual Eval - BETA

    Virtual Eval is a web application to assist designers in product evaluation of ADCs, DACs, and other ADI products. Using detailed models on Analog’s servers, Virtual Eval simulates crucial part performance characteristics within seconds. Configure operating conditions such as input tones and external jitter, as well as device features like gain or digital down-conversion. Performance characteristics include noise, distortion, and resolution, FFTs, timing diagrams, response plots, and more.


    IBIS Models

    AD9238 IBIS Models

    Design Tools

    Visual Analog

    For designers who are selecting or evaluating high speed ADCs, VisualAnalog™ is a software package that combines a powerful set of simulation and data analysis tools with a user-friendly graphical interface.

    Product Recommendations

    AD9238 Companion Parts

    Recommended ADC Drivers

    Recommended Clock Drivers

    Recommended External Reference

    • For improved thermal drift and gain accuracy: ADR130.

    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.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    AD9238BCPZ-20 Material Declaration Reliability Data 64 ld LFCSP (9x9mm, 4.70mm exposed pad)
    AD9238BCPZ-40 Material Declaration Reliability Data 64 ld LFCSP (9x9mm, 4.70mm exposed pad)
    AD9238BCPZ-65 Material Declaration Reliability Data 64 ld LFCSP (9x9mm, 4.70mm exposed pad)
    AD9238BCPZRL-20 Material Declaration Reliability Data 64-Lead LFCSP (9mm x 9mm w/ EP)
    AD9238BCPZRL-40 Material Declaration Reliability Data 64 ld LFCSP (9x9mm, 4.70mm exposed pad)
    AD9238BCPZRL-65 Material Declaration Reliability Data 64 ld LFCSP (9x9mm, 4.70mm exposed pad)
    AD9238BSTZ-20 Material Declaration Reliability Data 64-Lead LQFP (7mm x 7mm)
    AD9238BSTZ-40 Material Declaration Reliability Data 64-Lead LQFP (7mm x 7mm)
    AD9238BSTZ-65 Material Declaration Reliability Data 64-Lead LQFP (7mm x 7mm)
    AD9238BSTZRL-20 Material Declaration Reliability Data 64-Lead LQFP (7mm x 7mm)
    AD9238BSTZRL-40 Material Declaration Reliability Data 64-Lead LQFP (7mm x 7mm)
    AD9238BSTZRL-65 Material Declaration Reliability Data 64-Lead LQFP (7mm x 7mm)
    Wafer Fabrication Data

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