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PCM4201EVM General Description and Functional Block Diagram
J1
Analog
Input
Analog
Input Buffer
U1
PCM4201
Switch
SW1
To
DIT Circuitry
and
Clock Enables
X1
22.5792M
J4
EXT CLOCK INPUT
System
Clock
X2
24.576M
S/M
U2
OPA2134
G
N
D
J2
+5VA
+15V
−
15V
−
1
5
V
G
N
D
+
1
5
V
G
N
D
+
5
V
A
U10
REG1117
+3.3V
J6
+5VD
+
5
V
D
G
N
D
E
X
T
V
D
D
VDD
JMP4
BUF
S/M
PCM Data
HDR
J3
Audio
Serial Port
BUF
DIT
U7
DIT4096
J5
AES3 Output
Introduction
•
Buffered audio serial port output supports connection to external DSP hardware or audio test
equipment
•
An onboard Texas Instruments DIT4096 provides an AES3-encoded digital output suitable for use with
audio test systems or commercial audio equipment, supporting output sampling rates up to 108kHz
•
Onboard crystal oscillators, operating at 22.5792MHz and 24.576MHz, support 44.1kHz, 48kHz,
88.2kHz, and 96kHz sampling rates and all three sampling modes of the PCM4201
•
An external clock input allows operation at alternative sampling frequencies
As shipped, the PCM4201EVM re15V, –15V, and +5V analog power supplies. Options are
provided to operate the analog section from a single power supply by utilizing alternative op amps for the
input buffer circuit. A +5V digital supply is required, with a +3.3V digital supply being derived onboard
using a Texas Instruments REG1117 voltage regulator IC. Connections are provided for an external digital
supply for the PCM4201, allowing digital operation down to +1.8V.
The PCM4201EVM provides a complete platform for evaluating the performance and features of the
PCM4201 single channel audio A/D converter.
illustrates the functional block diagram for the
evaluation module.
Figure 2. PCM4201EVM Functional Block Diagram
PCM4201EVM User's Guide
SBAU108A – January 2005 – Revised February 2005
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