Evaluation Board for the 16-Bit, Dual, Continuous Time Sigma-Delta ADC Preliminary Technical Data AD9262EBZ/AD9262-5EBZ/AD9262-10EBZ Therefore, minimal or no filtering is required between the EVALUATION BOARD DESCRIPTION demodulator and the ADC. A prototype area for a fourth order The AD9262 evaluation board serves two purposes: as an filter is provided in which additional filtering can be tested. evaluation platform for the 16-bit dual continuous time sigma delta ADC and as a direct conversion demonstration platform. To achieve optimal performance from the AD9262, a low jitter Table 1 lists the product features of all the Analog Devices, Inc., differential clock is necessary, and the AD9516 family of parts components in the demonstrator. offers superior clock performance. The AD9516 and a crystal oscillator footprint are included on the evaluation board. In The AD9262 is a dual, 16-bit analog-to-digital converter (ADC) addition to providing a clock option to the ADC, outputs from based on a continuous time sigma-delta (-) architecture that the AD9516 can be used to drive other external capture devices. achieves 86 dB of dynamic range over a 10 MHz real or 20 MHz The ADR130B offers the option of using an external 0.5 V band complex bandwidth. The integrated features and characteristics gap reference voltage for the AD9262. The ADP3339 provides a unique to the continuous time - architecture significantly quiet and reliable voltage source to each of the ADI components. simplify its use and minimize the need for external components. This evaluation board supports the AD9262 family of products, In addition to offering system-level evaluation of the direct including the AD9262BCPZ-10, AD9262BCPZ-5, and conversion architecture, the evaluation board offers the flexibility AD9262BCPZ. of isolating the AD9262 from the surrounding components, enabling a detailed evaluation of only the AD9262. The ADC Direct conversion architectures, as shown in Figure 1, use a inputs can be disconnected from the ADL5382 and be driven single frequency translation step to convert the RF channel with an external source. The analog inputs of the AD9262 can directly to baseband without any intermediate frequency stages. be driven from either a differential transformer or the ADA4937, The frequency translation in this direct conversion demonstrator which is a very low noise, high linearity differential amplifier. is accomplished by the ADL5382, which is a quadrature demod- ulator. The ADL5382 covers the frequency range between 700 Complementing the AD9262 evaluation board are additional MHz and 2.7 GHz. hardware and software to capture and process the digital data The AD9262 has passive inputs, therefore allowing the ADL5382 from the output of the ADC. The AD9262 can only be evaluated using the HSC-ADC-EVALCZ high speed ADC data to directly drive the ADC. The AD9262 does not require a filter TM capture card in conjunction with the VisualAnalog data preceding the converter because the continuous time sigma- TM capture and analysis software. The SPIController software is delta architecture possesses inherent antialiasing capabilities. used to read and write to the AD9262. GAIN CONTROL ADL5382 AD9262 ADL5523 ADL5523 RF DA BPF BPF LPF ADC LO DCO 90 DDC ADF4360 0 DB LPF ADC 122.88MHz AD9516-0 Figure 1. Direct Conversion Receiver Block Diagram Rev. PrA Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied as is and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. from its use. Analog Devices reserves the right to change devices or specifications at any time Tel: 781.329.4700 www.analog.com without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not authorized to be used in life support devices or systems. Fax: 781.461.3113 2009 Analog Devices, Inc. All rights reserved. 07775-001AD9262EBZ/AD9262-5EBZ/AD9262-10EBZ Preliminary Technical Data TABLE OF CONTENTS Evaluation Board Description ......................................................... 1 Software ..........................................................................................7 Product Features ............................................................................... 3 Hardware ........................................................................................7 Getting Started .................................................................................. 4 AD9262 SPI Controller ................................................................7 Configuring the Evaluation Board ................................................. 5 AD9516 SPI Controller ................................................................7 Power Supply ................................................................................. 5 AD9516 Register Settings .............................................................8 Clock .............................................................................................. 5 VisualAnalog Overview ................................................................9 Receiver Input Configuration ..................................................... 5 Schematics ....................................................................................... 10 ADC Only Input Configuration ................................................. 5 L ayout ............................................................................................... 15 Differential Transformer Path .................................................... 6 Ordering Information .................................................................... 19 ADC Driver Path .......................................................................... 6 Bill of Materials ........................................................................... 19 Supporting Hardware and Software ............................................... 7 ESD Caution................................................................................ 23 Rev. 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