ad1862 Analog Devices, Inc., ad1862 Datasheet - Page 9

• Manufacturer Part Number: ad1862
• Description: Ultralow Noise 20-bit Audio Dac
• Manufacturer: Analog Devices, Inc.

REV. A
The AD1862 is an extremely high performance DAC designed
for high-end consumer and professional digital audio applica-
tions. Compact disc players, digital preamplifiers, digital musi-
cal instruments and sound processors benefit from the extended
dynamic range, low THD+Noise and high signal-to-noise ratio.
For the first time, the D/A converter is no longer the basic limi-
tation in the performance of a CD player.
The performance of professional audio gear, such as mixing
consoles, digital tape recorders and multivoice synthesizers can
utilize the wide dynamic range and signal-to-noise ratio to
achieve greater performance. And, the AD1862’s space saving
16-pin package contributes to compact system design. This per-
mits a system designer to incorporate more voices in multivoice
synthesizers, more tracks in multitrack tape recorders and more
channels in multichannel mixing consoles.
5V DIGITAL
SUPPLY
SONY
CXD1125
–
1130
1135
12V ANALOG
PSSL
SUPPLY
SLOB
LRCK
DATA
Figure 13. High Performance 20-Bit 8
C210
XTAI
–
5V DIGITAL
SUPPLY
CKO
LRCI
DIN
BCKI
XTI
SM5813
OW20 CKDV
16.9344MHz
XTO DOL
WCKO
BCKO
DOR
–9–
Oversampling CD Player Application
Furthermore, high-resolution signal processing and waveform
generation applications are equally well served by the AD1862.
HIGH PERFORMANCE CD PLAYER
Figure 13 illustrates the application of AD1862s in a high per-
formance CD player. Two AD1862s are used, one for the left
channel and one for the right channel. The CXD11XX chip de-
codes the digital data coming from the read electronics and
sends it to the SM5813. Input data is sent to each AD1862 by
the SM5813 digital interpolating filter. This device operates at
8 times oversampling. The NE5534 op amps are chosen for
current-to-voltage converters due to their low distortion and low
noise. The output filters are 5-pole designs. For the purpose of
clarity, all bypass capacitors have been omitted from the schematic.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
+
LE
+
–
–
CLK
DATA
–
TRIM
CLK
TRIM
–
–
DATA
LE
–
V
V
V
V
V
V
V
V
AD1862
L
L
S
AD1862
S
L
S
L
S
1 F
1 F
+
+
AGND
DGND
AGND
DGND
ADJ
NR
I
ADJ
NR
NR
I
+
NR
OUT
+
OUT
R
R
V
V
S
2
F
1
S
2
F
1
16
15
14
13
12
11
10
16
15
14
13
12
11
10
9
9
+
+
10 F
10 F
12V ANALOG
SUPPLY
12V ANALOG
SUPPLY
NE5534
NE5534
LOW PASS
LOW PASS
FILTER
FILTER
CHANNEL
CHANNEL
OUTPUT
OUTPUT
RIGHT
AD1862
LEFT