Overview
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).
PRODUCT HIGHLIGHTS
- Pin-compatible with the AD9248, 14-bit 20MSPS/ 40 MSPS/65 MSPS ADC.
- Speed grade options of 20 MSPS, 40 MSPS, and 65 MSPS allow flexibility between power, cost, and performance to suit an application.
- Low power consumption: AD9238-65: 65 MSPS = 600 mW, AD9238-40: 40 MSPS = 330 mW, and AD9238-20: 20 MSPS = 180 mW.
- Typical channel isolation of 85 dB at fIN = 10 MHz.
- The clock duty cycle stabilizer (AD9238-20/AD9238-40/ AD9238-65) maintains performance over a wide range of clock duty cycles.
- Multiplexed data output option enables single-port operation from either Data Port A or Data Port B.
APPLICATIONS
- Ultrasound equipment
- Direct conversion or IF sampling receivers
- WB-CDMA, CDMA2000, WiMAX
- Battery-powered instruments
- Hand-held scopemeters
- Low cost, digital oscilloscopes
Product Categories
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)
Documentation & Resources
-
AN-905: VisualAnalog™ Converter Evaluation Tool Version 1.0 User Manual8/18/2020
-
AN-835: Understanding High Speed ADC Testing and Evaluation (Rev. B)5/12/2015
-
AN-501: Aperture Uncertainty and ADC System Performance (Rev. A)2/14/2015
-
AN-282: Fundamentals of Sampled Data Systems2/14/2015
-
AN-756: Sampled Systems and the Effects of Clock Phase Noise and Jitter (Rev. 0)2/14/2015
-
AN-827: A Resonant Approach to Interfacing Amplifiers to Switched-Capacitor ADCs (Rev. 0)2/14/2015
-
AN-935: Designing an ADC Transformer-Coupled Front End (Rev. 0)2/14/2015
-
AN-742: Frequency Domain Response of Switched-Capacitor ADCs (Rev. C)2/14/2015
-
AN-345: Grounding for Low-and-High-Frequency Circuits2/14/2015
-
AN-1142: Techniques for High Speed ADC PCB Layout (Rev. 0)2/2/2012
-
AN-737: How ADIsimADC Models an ADC (Rev. B)11/9/2007
-
AN-807: Multicarrier WCDMA Feasibility (Rev. 0)11/9/2007
-
AN-808: Multicarrier CDMA2000 Feasibility (Rev. 0)11/9/2007
-
AN-803: Pin Compatible High Speed ADCs Simplify Design Tasks (Rev. 0)11/29/2006
-
AN-715: A First Approach to IBIS Models: What They Are and How They Are Generated (Rev. 0)12/14/2004
-
AN-741: Little Known Characteristics of Phase Noise (Rev. 0)11/29/2004
-
AN-297: Test Video A/D Converters Under Dynamic Conditions9/6/2002
-
Designing Power Supplies for High Speed ADC2/1/2012
-
Matching An ADC To A Transformer7/13/2007
-
Wideband A/D Converter Front-End Design Considerations: When to Use a Double Transformer Configuration7/1/2006 Analog Dialogue
-
Correlating High-Speed ADC Performance to Multicarrier 3G Requirements6/1/2003
-
DNL and Some of its Effects on Converter Performance6/1/2001
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.
MathWorks®
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.
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
AD9238 Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.