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AD1864P Datasheet(PDF) 9 Page - Analog Devices |
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AD1864P Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page AD1864 –9– REV. A AD1864 S +V L –V TRIM MSB SJ DL LL DGND AGND OUT V OUT I R F –VS OUT I +VL OUT V TRIM MSB LR CLK DR AGND SJ R F 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 +5V ANALOG SUPPLY –5V ANALOG SUPPLY VOICE 1 OUTPUT AD1864 S +V L –V TRIM MSB SJ DL LL DGND AGND OUT V OUT I R F –VS OUT I +VL OUT V TRIM MSB LR CLK DR AGND SJ RF 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 AD1864 S +V L –V TRIM MSB SJ DL LL DGND AGND OUT V OUT I R F –VS OUT I +VL OUT V TRIM MSB LR CLK DR AGND SJ RF 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 VOICE 1 LOAD ANALOG COMMON VOICE 3 LOAD DATA VOICE 2 LOAD CLOCK VOICE 2 OUTPUT VOICE 3 OUTPUT VOICE 4 OUTPUT VOICE 5 OUTPUT VOICE 6 OUTPUT VOICE 6 LOAD VOICE 5 LOAD VOICE 4 LOAD DIGITAL COMMON –5V DIGITAL COMMON +5V DIGITAL COMMON Figure 12. Cascaded AD1864s in a Multichannel Keyboard Instrument MULTICHANNEL DIGITAL KEYBOARD DESIGN Figure 12 illustrates how to cascade AD1864s to add multiple voices to an electronic musical instrument. In this example, the data and clock signals are shared between all six DACs. As the data representing an output for a specific voice is loaded, the appropriate DAC is updated. For example, after the 18 bits representing the next output value for Voice #4 is clocked out on the data line, then “Voice 4 Load” is pulled low. This produces a new output for Voice 4. Furthermore, all voices can be returned to the same output by pulling all six load signals low. In this application, the advantages of choosing the AD1864 are clear. Its flexible digital interface allows the clock and data to be shared among all DACs. This reduces printed circuit board area requirements and also simplifies the actual layout of the board. The low power requirement of the AD1864 (typically 215 mW) is an advantage in a multiple DAC system where its power advantage is multiplied by the number of DACs used. The AD1864 requires no external components, simplifying the design, reducing the total number of components required and enhancing reliability. ADDITIONAL APPLICATIONS Figures 13 through 16 show connection diagrams for the AD1864 and a number of standard digital filter chips from Yamaha, NPC and Sony. Figure 13 shows the SM5814AP operating with pipelined data. Cophase operation is not available with the SM5814AP in 18-bit mode. Figures 14 through 16 are all examples of cophase operation. Each application operates at 8 × F S for each channel. The 2-pole Rauch low-pass filters shown in Figure 11 can be used with all of the applications shown in this data sheet. The AD711 single op amp can also be used in these applications in order to ensure maximum channel separation. |
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