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2.11 Power Supply
The main power input, +12.0V DC, to the 56F827EVM is through a 2.1mm coax power jack, P1.
An optional +5.0V DC power supply input is available through a 2-pin terminal block, TB1. A
1.2A power supply is provided with the 56F827EVM; however, less than 500mA is required by
the EVM. The remaining current is available for user daughter card applications when connected
to the daughter card interface. The power regulation on the 56F827EVM provides +5.0V DC
voltage regulation for the codec's analog circuits and to the additional voltage regulation logic on
the EVM. The additional voltage regulation logic provides +2.5V DC voltage regulation for the
controller's core and +3.3V DC voltage regulation for the controller's I/O, memory, parallel
JTAG interface and supporting logic; refer to
indicated with a Power-On LED, referenced as LED7.
+12.0V DC
+5.0V DC
GND
Figure 2-9. Schematic Diagram of the Power Supply
2.12 Stereo Codec
A 16-bit audio quality stereo codec, Crystal Semiconductor CS4218, is connected to the
56F827's SSI 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 S4. The sample rate selections possible using this three-position dip switch are
detailed in
2-7. The codec supports +3.3V digital levels, eliminating the need for
Table
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 SSI port and to connect his own
codec to the SSI port; refer to
2-14
P1
+5.0V
Regulator
TB1
2-11. The on-board codec has analog signal conditioning
Figure
56F827EVM User Manual, Rev. 2
2-9. Power applied to the 56F827EVM is
Figure
Power
+5.0V DC
Condition
Analog
+3.3V DC
+3.3V
Regulator
+2.5V
+2.5V DC
Regulator
Codec
56F827
56F827EVM
Parts
56F827
Core
Freescale Semiconductor
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