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參數(shù)資料
| 型號(hào)： | PCM1739 |
| 英文描述： | 24-Bit, 192kHz Sampling, Enhanced Multi-Level, Delta-Sigma, Audio DIGITAL-TO-ANALOG CONVERTER |
| 中文描述： | 24位192kHz采樣，增強(qiáng)的多級(jí)，Δ-Σ，音頻數(shù)字模擬轉(zhuǎn)換器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 140K |
| 代理商： | PCM1739 |
13
PCM1739
FIGURE 8. Basic Connection Diagram.
APPLICATIONS INFORMATION
CONNECTION DIAGRAM
A basic connection diagram with the necessary power sup-
ply bypassing and decoupling components is shown in
Figure 8. Burr-Brown recommends using the component
values shown in Figure 8 for all designs.
The use of series resistors (22
to 100
) is recommended
for the SCLK, LRCK, BCLK, and DATA inputs. The series
resistor combines with the stray PCB and device input
capacitance to form a low-pass filter, which reduces high
frequency noise emissions and helps to dampen glitches and
ringing present on clock and data lines.
POWER SUPPLIES AND GROUNDING
The PCM1739 requires a +5V analog supply and a +3.3V
digital supply. The +5V supply is used to power the DAC
analog and output filter circuitry, while the +3.3V supply is
used to power the digital filter and logic circuitry. For best
performance, the +3.3V supply should be derived from the
+5V supply using a linear regulator, shown in Figure 8.
Burr-Brown’s REG1117-3.3 is an ideal choice for this appli-
cation.
Proper power supply bypassing is shown in Figure 8. The
bypass capacitors should be located as close as possible to
the PCM1739 package. The 1
μ
F and 10
μ
F capacitors should
be tantalum or aluminum electrolytic, while the 0.1
μ
F ca-
pacitors are ceramic (X7R type is recommended for surface
mount applications).
D/A OUTPUT CIRCUITS
Delta-sigma D/A converters utilize noise-shaping techniques
to improve in-band Signal-to-Noise (SNR) performance at
the expense of generating increased out-of-band noise above
the Nyquist Frequency, or f
S
/2. The out-of-band noise must
be low-pass filtered in order to provide optimal converter
performance. This is accomplished by a combination of on-
chip and external low pass filtering.
Figures 7a and 9 show the recommended external low pass
active filter circuits for dual and single-supply applications.
These circuits are 2nd-order filters using the Multiple Feed-
back (MFB) circuit arrangement, which reduces sensitivity to
passive component variations over frequency and tempera-
ture. For more information regarding MFB active filter design,
please refer to Burr-Brown Applications Bulletin AB-034.
+
+
+
+
+
LRCK
DATA
BCLK
CLKO
SCLK
V
SS
V
DD
TEST1
IBIT
V
CC
R
GNDR
V
COM
R
V
OUT
R
GNDA
FORM
DEM1
DEM0
NC
ZEROR
ZEROL
RSTB
MUTE
FILT
V
CC
L
GNDL
V
COM
L
V
OUT
L
V
CC
A
+3.3V
Regulator
R
S(1)
C
1
C
2
From
Mode Control
Logic
Zero Flag
Outputs
From Host Or
Master Reset
From
Mode Control
Logic
To
Output
Filter
Circuits
+5V
Analog
C
3
C
4
C
10
C
9
C
8
C
7
+
C
5
C
6
C
1
, C
4
, C
, C
= 10
μ
F Tantalum or Aluminum Electrolytic
C
2
, C
5
= 0.1
μ
F Ceramic
C
3
, C
10
= 1
μ
F Tanatlum or Aluminum Electrolytic
C
7
, C
8
= 1-10
μ
F Aluminum Electrolytic
NOTE: (1) R
S
= 20
to 100
.
PCM1739
+
+
From/To
Audio
Source
From
Mode Control
Logic
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