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AD1865 Arkusz danych(PDF) 8 Page - Analog Devices

Numer części AD1865
Szczegółowy opis  Complete Dual 18-Bit 16 x Fs Audio DAC
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD1865 Arkusz danych(HTML) 8 Page - Analog Devices

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AD1865
REV. 0
–8–
18-BIT CD PLAYER DESIGN
Figure 10 illustrates an 18-bit CD player design incorporating
an AD1865 D/A converter, an NE5532 dual op amp and the
SM5813 digital filter chip manufactured by NPC. In this de-
sign, the SM5813 filter transmits left and right digital data to
both channels of the AD1865. The left and right latch signals,
LL and LR, are both provided by the word clock signal
(WCKO) of the digital filter. The digital filter supplies data at
an 8
× F
S oversample rate to each channel.
The digital data is converted to analog output voltages by the
output amplifiers on the AD1865. Note that no external compo-
nents are required by the AD1865. Also, no deglitching cir-
cuitry is required.
An NE5532 dual op amp is used to provide the output antialias
filters required for adequate image rejection. One 2-pole filter
section is provided for each channel. An additional pole is cre-
ated from the combination of the internal feedback resistors
(RF) and the external capacitors C1 and C2. For example, the
nominal 3 k
Ω R
F with a 360 pF capacitor for C1 and C2 will
place a pole at approximately 147 kHz, effectively eliminating
all high frequency noise components.
Low distortion, superior channel separation, low power con-
sumption and a low parts count are all realized by this simple
design.
2
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28
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AD1865
+VS
TRIM
MSB
SJ
DL
LL
DGND
AGND
VOUT
RF
–VS
IOUT
+VL
VOUT
TRIM
MSB
LR
CLK
DR
AGND
SJ
RF
1
2
3
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24
23
22
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13
C1
C2
1
2
3
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7
8
–VS
+VS
LEFT
CHANNEL
OUTPUT
RIGHT
CHANNEL
OUTPUT
–5V ANALOG SUPPLY
+5V ANALOG SUPPLY
+5V DIGITAL
SUPPLY
BCKO
WCKO
DOL
DOR
VDD
DG
OW20
SM5813AP/
APT
NC
NE5532
IOUT
VSS1
VSS2
OW18
Figure 10. Complete 8
× F
S 18-Bit CD Player


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