Texas Instruments PCM5122/42EVM-U User Manual page 4

PCM5122/42EVM-U
The PCM5122/42EVM-U is divided into two sections. The left half contains the digital and USB interface,
sample rate conversion, optical/SPDIF and RCA digital inputs, clock circuitry, and reset logic. The right
half contains the PCM5122/42 device and the analog circuitry accompanying it. Note that this half of the
PCM5122/42EVM-U is the portion required on a potential customer application. The left half is intended to
emulate a wide variety of testing options and scenarios for the PCM5122/42 device.
The digital interface section, or left half of the PCM5122/42EVM-U, is a four-layer design. However, the
PCM5122/42 device and analog circuitry, or right half of the EVM board, consists only of two layers.
For the analog circuitry surrounding the PCM5122/42 device, certain components can be removed at the
cost of higher performance. This configurability allows for optimal ratio between board space and
performance. Components such as C1, C3, C7, and C11 can all be removed for additional board space.
The PCM5122/42EVM-U features:
• USB Interface
• Analog output
• TX output (J5)
• Optical/SPDIF input
2
• I S input
• Hardware- and software-programmable options
• Digital audio interface test points
• Control interface test points
• PurePath™ Studio Software Functionality
2.3 EVM Block Diagram
Figure 2 shows the block diagram for the PCM5122/42EVM-U.
TAS1020B USB Microcontroller
USB I/F
Mini-USB
2
I S
SRC4392 Sample Rate Converter
Audio Serial Port A
S/PDIF
DIR
(RCA)
S/PDIF
(Optical)
TAS1020B MCLK (11.288 MHz)
EXT 3.3 V BNC MCLK
24.576 MHz OSC
RXCKO
4
PCM5122/42EVM-U
GPIO
2
I C/SPI
Audio Serial Port B
SRC
DIT
RXCKO
MCLK Select
SW3
Figure 2. PCM5122/42EVM-U Block Diagram
Copyright © 2012, Texas Instruments Incorporated
Interface
Selection
W3
W5
www.ti.com
PCM51xx Analog
2.1 V DAC Outputs
RMS
SLAU444 – May 2012
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