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EVAL-AD7765EBZ Datasheet(PDF) 3 Page - Analog Devices |
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EVAL-AD7765EBZ Datasheet(HTML) 3 Page - Analog Devices |
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3 / 23 page  Preliminary Technical Data EVAL-AD7764/AD7765EDZ Rev. PrC | Page 3 of 23 HARDWARE DESCRIPTION POWER SUPPLIES The EVAL-AD7764/5EDZ must be powered using a power supply that applies a 7.5 V between the V+ and GND terminals of Connector J2. This 7.5 V supply is then regulated on board using ADP3330- 2.5 ADP3330-5 devices (U5 and U3) to provide the 2.5 V and 5 V signals required by the AD7764/AD7765 device. A filter path of the 2.5 V supply is used to power other digital functionality on the EVAL-AD7764/AD7765EDZ excluding the AD7764/AD7765 device. A separately filtered 5 V supply also supplies the crystal oscillator on the EVAL-AD7764/AD7765EDZ. The crystal oscillator is provided for customers that wish to use the device in a stand-alone manner where they wish to provide and acquire the digital signals going to and from the AD7764/5 device. For this case, the user may apply the MCLK sourced from the crystal oscillator. Note that in the default mode the AD7764/5 evaluation board is set up so that the EVAL-CED1Z board provides the MCLK signal to the ADC as well as providing and acquiring all other digital signals for the evaluation system. DIFFERENTIAL INPUT The differential input to the AD7764/AD7765 device is applied through the connector marked J1. This is an XLR audio standard connector. The differential inputs are routed through the AD7764/AD7765 on-board differential amplifier using the external circuit components as detailed in the schematic as shown in this technical note and the AD7764/AD7765 data sheets. REFERENCE CIRCUIT The AD7764/5 evaluation board uses the low noise ADR444 (4.096V) reference to supply the ADC. See Gerber files on AD7764/5 product pages on www.analog.com for details on the layout and configuration for this reference supply. STANDALONE OPERATION The EVAL-AD7764/AD7765EDZ can be used in a standalone manner (that is, without using the EVAL-CED1Z). In this case, however, the user must provide all the required interface com- munications and be able to provide a means to acquire the output. SMB footprints, allow for external MCLK, SYNC, RESET and Decimation rate signals to be applied to the AD7764/65 device. All other digital signals are accessible either from the 34-pin header (J4) or from the marked test points on the evaluation board. DECOUPLING AND LAYOUT RECOMMENDATIONS The data sheets of the AD7764/AD7765 devices contain specific information about the decoupling and layout recommendations required to achieve the optimum specifications. The EVAL-AD7764/AD7765EDZ adheres to these recom- mendations and is designed as the blueprint for users of the AD7764/Ad7765 devices. The EVAL-AD7764/AD7765EDZ are 4-layer boards. One layer is a dedicated ground plane. All supplies to devices on the EVAL-AD7764/AD7765EDZ are decoupled to this ground plane. In addition to the PCB’s top and bottom layers, there is also a layer for routing power signals. All layers of the board are detailed in the Evaluation Board Schematic and Artwork section. |
Similar Part No. - EVAL-AD7765EBZ_15 |
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Similar Description - EVAL-AD7765EBZ_15 |
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