DSP56858EVM User Manual, Rev. 3
2-16
Freescale Semiconductor
2.12 Stereo Codec
A 16-bit audio-quality stereo codec, Crystal Semiconductor CS4218, is connected to the 56858’s
ESSI port to support audio, voice and signal analysis applications. The codec is clocked with a
12.288MHz oscillator. This allows the codec to operate between a sample frequency of 8KHz
and 48KHz. The sample rate can be manually set by setting the appropriate switch positions on
DIP switch S5. The sample rate selections possible using this three-position dip switch are
detailed in
Table 2-8
. The codec su3.3V digital levels, eliminating the need for voltage
level translation circuitry. Additionally, a set of zero ohm resistors are provided on the EVM to
allow a user to disconnect the on-board codec from the ESSI port and allow him to connect his
own codec to the ESSI port; see
Figure 2-12
. The on-board codec has analog signal conditioning
logic, allowing direct connection to its line-level input and line-level output signals through two
1/8” stereo jacks; reference
Figure 2-11
.
Table 2-8. Codec Sample Rate Selector
SW 5
Position 3
(MF6)
SW 5
Position 2
(MF7)
SW 5
Position 3
(MF8)
Sample Rate
ON
ON
ON
48.00KHz
ON
ON
OFF
32.00KHz
ON
OFF
ON
24.00KHz
ON
OFF
OFF
19.20KHz
OFF
ON
ON
16.00KHz
OFF
ON
OFF
12.00KHz
OFF
OFF
ON
9.60KHz
OFF
OFF
OFF
8.00KHz
Содержание 56858
Страница 2: ......
Страница 6: ...DSP56858EVM User Manual Rev 3 iv Freescale Semiconductor ...
Страница 8: ...DSP56858EVM User Manual Rev 3 vi Freescale Semiconductor ...
Страница 40: ...DSP56858EVM User Manual Rev 3 2 24 Freescale Semiconductor ...
Страница 41: ...56858EVM Schematics Rev 3 Freescale Semiconductor Appendix A 1 Appendix A 56858EVM Schematics ...
Страница 59: ......
