Features and Benefits
- Integrated Dual 12-Bit Analog-to-Digital Converters
- Single 3 V Supply Operation (2.7 V to 3.6 V)
- SNR = 70 dBc (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 Vp-p to 2 Vp-p Range
- Offset Binary or Twos Complement Data Format
- Clock Duty Cycle Stabilizer
- Output datamux option
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).
- Ultrasound equipment
- Direct conversion or IF sampling receivers
WB-CDMA, CDMA2000, WiMAX
- Battery-powered instruments
- Hand-held scopemeters
- Low cost, digital oscilloscopes
Product Lifecycle 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)
Application Notes (17)
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.
AD9238 IBIS Models
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.
AD9238 Companion Parts
Recommended ADC Drivers
Recommended Clock Drivers
Recommended External Reference
- For improved thermal drift and gain accuracy: ADR130.
Technical Articles (5)
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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Sample & Buy
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