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C1608C0G1H272J Datasheet(PDF) 11 Page - Analog Devices |
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C1608C0G1H272J Datasheet(HTML) 11 Page - Analog Devices |
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11 / 32 page  EVAL-AD7903SDZ User Guide UG-609 Rev. 0 | Page 11 of 32 EVALUATION BOARD CIRCUITRY ANALOG INPUTS The analog inputs to the evaluation board are SMA Connectors J6, J7, J10, and J15. These inputs are buffered with dedicated amplifier circuitry (U12, U14, U16, and U17), as shown in Figure 26 and Figure 27. The circuit not only allows different configurations, input range scaling, and filtering but also allows adding a dc component and using different op amps and supplies. The analog input amplifiers are set as unity-gain buffers by factory default. The amplifier positive rail is driven from 7.5 V (from U13— ADP7104). The negative amplifier rail is driven from –VS (generated by U3—ADP2301). The default configuration sets all op amps (U12, U14, U16, and U17) at midscale, generated from a buffered reference voltage divider (VCM). The evaluation board is configured by factory default for providing a differential analog input path to ADC1 and ADC2 (see Figure 16). For dynamic performance, an FFT test can be done by applying a very low distortion ac source. For low frequency testing, the audio precision source can be used directly because its outputs are isolated. Set the outputs for a balanced and floating ground. Different sources can be used; however, most are single-ended sources that use a fixed output resistance. By default, the evaluation board uses the amplifiers as unity-gain buffers. The noninverting input has a common-mode adjustment that involves a 49.9 kΩ shunt resistor. This resistor creates a voltage divider with the source, which must be accounted for when using the board. REFERENCE An external 5 V reference (U6—ADR435) is used to supply the ADCs directly. SERIAL INTERFACE The evaluation board uses the SPORT interface from the ADSP-BF527 DSP. Multiple AND gates (U9, U10, and U11) are used to clock and gate the SPORT transfer to the ADC device. |
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