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CDB4353
5. POWER SUPPLY CIRCUITRY
Power is supplied to the evaluation board by two binding posts, GND and +3.3 V (see Figure 33 ). The allowable
input voltage range for the binding posts is 3.13 V to 3.47 V. The VL supply can be connected to the +3.3 V binding
post by shunting J1 or provided externally by removing the shunt on J1 and connecting another voltage to pin 2 of
J1 (labeled VL). VCP and VA are normally supplied by the 3.3 V binding post but can be set to separate voltages
by removing the shunts on J8 and J10, removing R9 and R14, and then applying external voltages to pin 1 of J8
and J10.
Power consumption of the CS4353 can be measured through the voltage drop at J8, J9, and J10 when the shunts
are removed.
WARNING: Refer to the CS4353 datasheet for maximum allowable voltages levels. Operation outside of this range
can cause permanent damage to the device.
6. GROUNDING AND POWER SUPPLY DECOUPLING
As with any high-performance converter, the CS4353 requires careful attention to power supply and grounding ar-
rangements to optimize performance. Figure 32 details the connections to the CS4353 and Figures 34 , 35 , and 36
show the component placement and top and bottom layout. The decoupling capacitors are located as close to the
CS4353 as possible.
7. HARDWARE CONTROL
The CDB4353 is controlled through settings on switch S1. This allows for configuration of the board without a PC.
Switch S1 can toggle settings for CS8416 MCLK speed, CS8416 and CS4353 PCM data format, clock and data
source for the board, and the Hardware Mode configuration of the CS4353. Table 1 below shows S1 settings for
S/PDIF input and PCM input header quick setup modes. See Table 4 for details on each switch S1 setting.
S1 POSITION
1
2
3
4
5
S/PDIF INPUT - OPT1 or J16
Up
Down
Down
Up
Down
PCM INPUT - J3
Down
Down
Down
Up
Down
Table 1. Switch S1 Quick Setup
8. CS8416 AND CS4353 RESET
Pressing switch S2 resets the CS8416. Jumper J5 sets whether the CS4353 is reset by switch S2 (External) or by
the CS4353’s internal power-on reset function (POR).
9. ANALOG OUTPUT FILTERING
The analog output on the CDB4353 has been designed according to the CS4353 datasheet. This output circuit con-
sists of a single-pole R and C filter. J11 selects the output ground reference for the CS4353. The output reference
can be set to the evaluation board’s ground (shunted) or J14 and J15’s ground connection (not shunted). See
Figure 33 for details of CS4353 output filter.
DS803DB2
5
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