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CDB44L11
2.2
Clocking
The provided MCLK oscillator frequency is 12.352 MHz. Any oscillator between 6.4 MHz and
24.576 MHz may be used in the socket. The MCLK signal is divided by the clock divider to pro-
duce SCLK (MCKL/4), and LRCK (MCKL/256). Using a 12.352 MHz MCLK, SCLK is 3.088 MHz,
and LRCK is 48.25 kHz.
2.3
CS8420 Sample Rate Converter
Refer to Figure 2. The CS8420 is a S/PDIF receiver and sample rate converter. It is configured
to accept data at any sample rate between 32 kHz and 96 kHz and transmits data in PCM audio
data format based on the MCLK oscillator frequency. The CS8420, while not required, improves
system performance by reducing clock jitter and providing one fixed output frequency. In this de-
sign, the 48.25 kHz sample rate was chosen so that the CS8420 does not perform 1:1 conversion
when receiving 48 kHz input data. Noise can be introduced into the system when a 1:1 conver-
sion is performed and should be avoided for optimal performance. For more information please
refer to the CS8420 datasheet.
2.4
Microcontroller
Figure 3 shows the host microcontroller circuitry. There are 8 buttons for control features, 5 LEDs
to indicate status, and an I 2 C interface to the CS8420 and the CS44L11. See Table 3 for the ini-
tial CS44L11 register settings. After power is first applied to the board or the reset button is
pressed, all settings will revert to the default settings.
The board is populated with a Motorola MC68HC908GP32 with the software preprogrammed to
run the CDB44L11. The microcontroller code was written in C and compiled with the 'COSMIC
C Compiler'.
The microcontroller uses the I 2 C control bus to read and write to the CS44L11 control registers
- refer to CS44L11 data sheet for more information.
2.5
Power Supplies and Level-Shifting
Figure 4 shows the power supply and level shifting circuitry. Due to the CS44L11 operating at
below +5.0 V, level-shifting circuitry has been included to allow for operation with the microcon-
troller and the CS8420, both of which must run at +5.0 V.
The CS44L11 uses a half bridge output stage and is therefore affected by power supply pumping.
Power supply pumping is a phenomenon observed in half-bridge switching amplifiers. It is
caused by stored energy in the output inductor that is fed back into the power supply during
switching. To compensate for power supply pumping, a resistive load is used to dissipate the
4
DS640DB1
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