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AD1865R-J Datasheet(PDF) 9 Page - Analog Devices |
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AD1865R-J Datasheet(HTML) 9 Page - Analog Devices |
9 / 12 page AD1865 REV. 0 –9– MULTICHANNEL DIGITAL KEYBOARD DESIGN Figure 11 illustrates how to cascade AD1865’s 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 ap- propriate DAC is updated. For example, after the 18-bits repre- senting 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 AD1865 are clear. Its flexible digital interface allows the clock and data to be shared among all DACs. This reduces PC board area require- ments and also simplifies the actual layout of the board. The low power requirements of the AD1865 (approximately 225 mW) is an advantage in a multiple DAC system where any power advan- tage is multiplied by the number of DACs used. The AD1865 requires no external components, simplifying the design, reduc- ing the total number of components required and enhancing reliability. AD1865 TRIM MSB SJ AGND VOUT IOUT RF –VS +VL LR CLK DR 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 AD1865 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 AD1865 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 SUPPLY +VS DL LL DGND IOUT VOUT TRIM MSB AGND SJ RF NC TRIM MSB SJ AGND VOUT IOUT RF –VS +VL LR CLK DR TRIM MSB SJ AGND VOUT IOUT RF –VS +VL LR CLK DR +VS DL LL DGND IOUT VOUT TRIM MSB AGND SJ RF NC +VS DL LL DGND IOUT VOUT TRIM MSB AGND SJ RF NC Figure 11. Cascaded AD1865s in a Multichannel Keyboard Instrument |
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