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(yè)數(shù): 14/16頁(yè)
文件大?。?/td> 140K
代理商: PCM1739
14
PCM1739
FIGURE 10. Recommended PCB Layout.
PCM1739
V
CC
V
DD
DGND
Return Path for Digital Signals
Analog
Ground
Digital
Ground
AGND
Output
Circuits
DIGITAL SECTION
ANALOG SECTION
Digital Logic
and
Audio
Processor
Digital Power
+V
D
DGND
Analog Power
+5VA
+V
S
AGND
REG
–V
S
PCM1739
V
CC
V
DD
DGND
Output
Circuits
RF Choke or Ferrite Bead
Common
Ground
AGND
DIGITAL SECTION
ANALOG SECTION
V
DD
Power Supplies
+5V
+V
S
AGND
REG
–V
S
FIGURE 9. Dual Supply Filter Circuit.
Since the overall system performance is defined by the
quality of the D/A converters and their associated analog
output circuitry, high quality audio op amps are recom-
mended for the active filters. Burr-Brown’s OPA2134 and
OPA2353 dual op amps are shown in Figures 7a and 9, and
are recommended for use with the PCM1739.
PCB LAYOUT GUIDELINES
A typical PCB floor plan for the PCM1739 is shown in
Figure 10. A ground plane is recommended, with the analog
and digital sections being isolated from one another using a
split or cut in the circuit board. The PCM1739 should be
oriented with the digital I/O pins facing the ground plane
split/cut, allowing for direct connection of the digital audio
interface and control signals originating from the digital
section of the board.
Separate power supplies are recommended for the digital
and analog sections of the board. This prevents the switching
noise present on the digital supply from contaminating the
analog power supply and degrading the dynamic perfor-
mance of the PCM1739. In cases where a common +5V
supply must be used for the analog and digital sections, an
R
1
R
3
R
4
R
2
C
1
C
2
V
IN
V
OUT
OPA2134
2
3
1
R
2
R
1
A
V
FIGURE 11. Single-Supply PCB Layout.
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