PCM1604 BURR-BROWN [Burr-Brown Corporation], PCM1604 Datasheet - Page 29

• Manufacturer Part Number: PCM1604
• Description: 24-Bit, 192kHz Sampling,6-Channel, Enhanced Multi-Level, Delta-Sigma DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

FIGURE 17. Recommended PCB Layout.
FIGURE 18. Single-Supply PCB Layout.
PCB LAYOUT GUIDELINES
A typical PCB floor plan for the PCM1604 and PCM1605 is
shown in Figure 17. 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 PCM1604
or PCM1605 should be oriented with the digital I/O pins
facing the ground plane split/cut to allow for short, direct
connections to the digital audio interface and control signals
originating from the digital section of the board.
Digital Power
+V
Digital Logic
Processor
D
DIGITAL SECTION
Audio
and
DGND
DIGITAL SECTION
RF Choke or Ferrite Bead
V
DD
Return Path for Digital Signals
REG
+5V
29
V
DGND
AGND
DD
Power Supplies
PCM1604
PCM1605
ANALOG SECTION
V
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 D/A converters. In cases where a common +5V
supply must be used for the analog and digital sections, an
inductance (RF choke, ferrite bead) should be placed be-
tween the analog and digital +5V supply connections to
avoid coupling of the digital switching noise into the analog
circuitry. Figure 18 shows the recommended approach for
single-supply applications.
AGND
V
DGND
ANALOG SECTION
AGND
CC
DD
+5VA
REG
Analog Power
PCM1604
PCM1605
AGND
+V
V
CC
S
+V
–V
S
S
PCM1604, PCM1605
–V
Circuits
Output
S
Circuits
Output
Common
Ground
Ground
Ground
Digital
Analog
®