CDB4385A View Datasheet(PDF) - Cirrus Logic
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CDB4385A Datasheet PDF : 31 Pages
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5. POWER SUPPLY CIRCUITRY
CDB4385A
Power is supplied to the evaluation board by four binding posts (GND, +5V, +12V, and -12V), see Figure 53. The
‘+5V’ terminal supplies VA and the rest of the +5-V circuitry on the board. The +3.3-V circuitry is powered from a
regulator. The +2.5 volts required for VD is also provided from an on-board regulator. The +5-V supply should be
set within the recommended values for VA stated in the CS4385A datasheet.
WARNING: Refer to the CS4385A datasheet for maximum allowable voltage levels. Operation outside this range
can cause permanent damage to the device.
6. GROUNDING AND POWER SUPPLY DECOUPLING
As with any high-performance converter, the CS4385A requires close attention to power supply and grounding ar-
rangements to optimize performance. Figure 44 details the connections to the CS4385A; Figures 54, 55, and 56
show the component placement and top and bottom layout. The decoupling capacitors are located as close to the
CS4385A as possible. Extensive use of ground plane fill in the evaluation board yields large reductions in radiated
noise.
7. ANALOG OUTPUT FILTERING
The analog output on the CDB4385A is designed according to the CS4385A datasheet. The output circuit includes
an active 2-pole, 50-kHz filter which utilizes the multiple-feedback topology.
CONNECTOR
+5V
GND
+12V
-12V
S/PDIF IN - J9
S/PDIF IN - OPT1
PCM INPUT - J11
DSD INPUT - J7
OUTA1-B4
INPUT/OUTPUT
SIGNAL PRESENT
Input
+ 5 V power
Input
Ground connection from power supply
Input
+12 V positive supply for the on-board filtering
Input
-12 V negative supply for the on-board filtering
Input
Digital audio interface input via coax
Input
Digital audio interface input via optical
Input
Input for master, serial, left/right clocks and serial data
Input
Input for DSD serial clock and DSD data
Output
RCA line level analog outputs
Table 1. System Connections
DS837DB1
5
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