www.ti.com
1.3
Related Documentation from Texas Instruments
1.4
Additional Documentation
Introduction
A differential analog input is supported at connector J1. The analog input supports either a 3-pin male XLR
or balanced TRS input plug. The analog input is buffered and filtered using a low noise input circuit,
utilizing a Texas Instruments' OPA2134 dual audio op amp IC. The output of the buffer circuit is connected
to the differential input of the PCM4201, which is then used to convert the analog signal to a 24-bit linear
PCM representation in the digital domain.
The 24-bit PCM output data is made available at header J3. The audio data can also be routed to the
DIT4096 digital interface transmitter, supporting an AES3-encoded output, which is provided at BNC
connector J5. The buffered header is convenient for interfacing to external development hardware or
digital signal processors, while the AES3-encoded outputs may be connected to audio test systems or
commercial audio equipment.
Power is connected to the board at either terminal block J2 for the analog supplies, or at terminal block J6
for the digital supplies.
Manual reset circuits are provided for both the PCM4201 (U1) and the DIT4096 (U7). The ADC RESET
switch (SW2) is utilized for resetting the A/D converter, while the DIT RESET switch (SW3) is utilized for
resetting the AES3 transmitter.
The system or master clock for the evaluation module may be generated onboard or by an external clock
source. Oscillators X1 and X2 operate at fixed clock frequencies of 22.5792MHz and 24.576MHz,
respectively. The oscillators provide low jitter clock sources for measuring the performance of the
PCM4201 in Master mode operation. Alternatively, an external clock source may be connected at J4 for
Master mode operation, supporting alternative sampling rates. For Slave mode operation, the system
clock is provided from an external source through header J3. Switch SW1 provides configuration control
for the PCM4201, the DIT4096, the onboard oscillators, and the external clock input at connector J4.
The following documents provide information regarding Texas Instruments integrated circuits used in the
assembly of the PCM4201EVM. The latest revisions of these documents are available from the TI web
site at
Data Sheet
Literature Number
PCM4201 Datasheet
DIT4096 Datasheet
OPA2134 Datasheet
REG1117 Datasheet
SN74ALVC245 Datasheet
SN74LVC1G04 Datasheet
SN74LVC1G08 Datasheet
SN74LVC1G125 Datasheet
The following documents or references provide information regarding selected non-TI components used in
the assembly of the PCM4201EVM. These documents are available from the corresponding manufacturer.
Document/Reference
Manufacturer
SM7745H Series CMOS Oscillators
Pletronics (
)
PCM4201EVM User's Guide
4
SBAU108A – January 2005 – Revised February 2005
