SW3
W5
TAS1020B MCLK (11.288 MHz)
EXT 3.3 V BNC MCLK
24.576 MHz OSC
RXCKO
MCLK Select
SRC4392 Sample Rate Converter
DIR
DIT
SRC
RXCKO
Audio Serial Port B
Audio Serial Port A
TAS1020B USB Microcontroller
USB I/F
I S
2
I C/SPI
2
GPIO
Mini-USB
S/PDIF
(Optical)
S/PDIF
(RCA)
W3
Interface
Selection
PCM51xx
2.1 V
DAC
RMS
Analog
Outputs
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
•
I
2
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
shows the block diagram for the PCM5122/42EVM-U.
Figure 2. PCM5122/42EVM-U Block Diagram
4
PCM5122/42EVM-U
SLAU444 – May 2012
Copyright © 2012, Texas Instruments Incorporated
