Datasheet

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APPLICATION INFORMATION
Connection Diagrams
Power Supplies and Grounding
LRCK
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
PCM1772
DATA
BCK
PD
AGND1
AGND2
V
COM
V
OUT
R
SCKI
V
OUT
L
MS
MC
MD
V
CC1
AIN
V
CC2
Controller
Analog In
Post
LPF
Audio DSP
Power Amplifier
or Headphone
Amplifier
10 µF
Post
LPF
Power Amplifier
or Headphone
Amplifier
10 µF
S0007-01
10 µF
1.6 V to 3.6 V
10 µF
10 µF
0.1 µF
10 µF0.1 µF
PCM1772 , PCM1773
SLES010G – SEPTEMBER 2001 – REVISED MARCH 2007
Figure 29 shows the basic connection diagram with the necessary power supply bypassing and decoupling
components. It is recommended that the component values shown in Figure 29 be used for all designs.
The use of series resistors (22 Ω to 100 Ω ) is recommended for the SCKI, LRCK, BCK, and DATA inputs. The
series resistor combines with the stray PCB and device input capacitance to form a low-pass filter that reduces
high-frequency noise emissions and helps to dampen glitches and ringing present on the clock and data lines.
The PCM1772 and PCM1773 devices require a 2.4-V typical analog supply for V
CC1
and V
CC2
. These 2.4-V
supplies power the DAC, analog output filter, and other circuits. For best performance, these 2.4-V supplies
must be derived from the analog supply using a linear regulator, as shown in Figure 29 .
Figure 29 shows the proper power supply bypassing. The 10- µ F capacitors must be tantalum or aluminum
electrolytic, while the 0.1- µ F capacitors are ceramic (X7R type is recommended for surface-mount applications).
Figure 29. Basic Connection Diagram
28
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