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AD1865R-J Datasheet(PDF) 9 Page - Analog Devices

Part # AD1865R-J
Description  Complete Dual 18-Bit 16 x Fs Audio DAC
Download  12 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD1865R-J Datasheet(HTML) 9 Page - Analog Devices

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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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