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AD71028 Datasheet(PDF) 9 Page - Analog Devices |
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AD71028 Datasheet(HTML) 9 Page - Analog Devices |
9 / 20 page AD71028 Rev. 0 | Page 9 of 20 CLK27_PA, CLK27_PB Input pins to the divide-by-1125 block. If an external PLL is used to generate the audio master clock, the 27 MHz video master clock may be applied to these pins where it is divided by 1125 to produce a 24 kHz feedback clock to the external PLL phase detector. DIV1_PA, DIV1_PB Output of divide-by-1024 circuit. Divides the master clock signal by 1024 (or 512 when DOUBLE is asserted). Used to interface to external PLL. DIV2_PA, DIV2_PB Output of divide-by-1125 circuit. Divides the master-clock signal by 1125. Used to interface to external PLL. The output signal is a pulse with a duration of one master clock, and should therefore be used with edge-triggered phase detectors. REFCAP Analog reference voltage input. The nominal REFCAP input voltage is 2.5 V; the analog gain scales directly with the voltage on this pin. Any ac signal on this pin will cause distortion, and therefore a large decoupling capacitor should be used to ensure that the voltage on REFCAP is clean. The input impedance of REFCAP is greater than 1 MΩ. FILTCAP Filter cap point. This pin is used to reduce the noise on an internal biasing point in order to provide the highest performance. It may not be necessary to connect this pin, depending on the quality of the layout and grounding used in the application circuit. DVDD Digital VDD for core. 5 V nominal. ODVDD Digital VDD for all digital outputs. Variable from 2.7 V to 5.5 V. DGND Digital ground. AVDD Analog VDD. 5 V nominal. Bypass capacitors should be placed close to the pins and connected directly to the analog ground plane. AGND Analog ground. OUTA+, OUTA– Differential analog outputs for Processor A. The nominal output voltage for a 1 kHz 0 dB mono input signal is 600 mV rms. This level may be adjusted by writing to SPI location 258. OUTB+, OUTB– Differential analog outputs for Processor B. The nominal output voltage for a 1 kHz 0 dB mono input signal is 600 mV rms. This level may be adjusted by writing to SPI location 770. |
Similar Part No. - AD71028_15 |
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Similar Description - AD71028_15 |
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