AD1865 Просмотр технического описания (PDF) - Analog Devices
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AD1865 Datasheet PDF : 12 Pages
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AD1865
SM5813AP/
1
APT
28
2
27
3
4
5
6
7
8 VSS1
9
10
11
12
13
14
BCKO 26
WCKO 25
DOL 24
DOR 23
VDD 22
VSS2 21
DG 20
19
18
OW18 17
OW20 16
15
–5V ANALOG SUPPLY
+5V ANALOG SUPPLY
AD1865
1 –VS
+VS 24
2 TRIM
TRIM 23
3 MSB
MSB 22
C1
C2
4 IOUT
IOUT 21
5 AGND AGND 20
6 SJ
SJ 19
7 RF
8 VOUT
9 +VL
10 DR
RF 18
VOUT 17
NC 16
DL 15
11 LR
LL 14
12 CLK
DGND 13
1
+VS 8
2
7
3
6
4 –VS
5
NE5532
LEFT
CHANNEL
OUTPUT
RIGHT
CHANNEL
OUTPUT
+5V DIGITAL
SUPPLY
Figure 10. Complete 8 × FS 18-Bit CD Player
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 × FS 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 kΩ RF 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.
–8–
REV. 0
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