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參數(shù)資料
| 型號： | PCM1738E2K |
| 英文描述： | 24-Bit, 192kHz Sampling, Advanced Segment, Audio-Stereo DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 24位192kHz采樣，高級分段，音頻立體聲數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 31/33頁 |
| 文件大?。?/td> | 2274K |
| 代理商： | PCM1738E2K |
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PCM1738
SBAS174B
31
BYPASS AND DECOUPLING CAPACITOR
REQUIREMENTS
Various sized decoupling capacitors can be used, with no
special tolerances being required. All capacitors should be
located as close as physically possible to the power supply
and reference pins of the PCM1738 to reduce noise pickup
from surrounding circuitry. Aluminum electrolytic capaci-
tors that are designed for hi-fi audio applications are recom-
mended for larger values, while metal-film or monolithic
ceramic capacitors are recommended for smaller values.
I/V SECTION
I/V conversion, using the circuit shown in Figure 9, achieves
data-sheet performance (see Figure 9). To obtain 0.0005%
THD+N, 117dB signal-to-noise ratio audio performance, THD+N
and input noise performance an op amp IC must be considered.
Input noise of the op amp directly effects the output noise level
of the application.
All components of the I/V section should be located physi-
cally close to the PCM1738 current outputs. All connections
should be made as short as possible to eliminate pickup of
radiated noise.
POST LOW-PASS FILTER DESIGN
The out-of-band noise level and sampling spectrum level are
much lower than typical delta-sigma type DACs, due to the
combination of a high-performance digital filer and the
advanced segment DAC architecture. The use of a second-
or third-order filter is recommended for the post low-pass
filter (see Figure 9 for a second-order filter) following the I/
V conversion stage. The cutoff frequency of the post LPF is
dependent upon the application, given the variety of sam-
pling rates supported by the CD-DA, DVD-M, DVD-A, and
SACD systems.
FIGURE 16. Audio Data Input Format for External Digital Filter (Internal DF Bypass Mode) Application.
15
16
1
2
11
12
13
14
15
16
3
4
5
6
7
8
9
10
WDCK
BCK
DATAL
DATAR
MSB
LSB
Audio Data Word = 16 Bit
19
20
5
6
15
16
17
18
19
20
7
8
1
2
3
4
9
10
11
12
13
14
DATAL
DATAR
MSB
LSB
Audio Data Word = 20 Bit
23
24
9
10
19
20
21
22
23
24
11
12
13
14
15
16
1
2
3
4
5
6
7
8
17
18
DATAL
DATAR
MSB
LSB
Audio Data Word = 24 Bit
1/4f
S
or 1/8f
S
FIGURE 17. Audio Interface Timing for External Digital Filter (Internal DF Bypass Mode) Application.
SYMBOL
PARAMETER
MIN
MAX
UNITS
t
BCY
t
BCL
t
BCH
t
BL
t
LB
t
DS
t
DH
BCK Pulse Cycle Time
BCK Pulse Width LOW
BCK Pulse Width HIGH
BCK Rising Edge to WDCK Falling Edge
WDCK Falling Edge to BCKIN Rising Edge
DATA Set-Up Time
DATA Hold Time
18
7
7
5
5
5
5
ns
ns
ns
ns
n
s
ns
ns
WDCK
BCK
DATAL
DATAR
50% of V
DD
50% of V
DD
50% of V
DD
t
BCH
t
BCL
t
LB
t
BL
t
DS
t
DH
t
BCY
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