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AD1864P bảng dữ liệu(PDF) 9 Page - Analog Devices

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AD1864P bảng dữ liệu(HTML) 9 Page - Analog Devices

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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
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+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
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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
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11
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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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