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Figure 2
shows a simplified block diagram for the PCM4222EVM circuit functions. The blocks labeled FDA
are the OPA1632 fully differential amplifier input circuits (U4 and U5). The blocks labeled DIT are the
DIT4192 digital audio interface transmitters (U13 and U14). Two transmitters are required to support AES3
Single-Channel, Double Sampling Frequency applications.
J1
Left Cha
nne
l
Analog I
npu
t
Analog
J3
Power
J2
Right Channel
Analog I
npu
t
Figure 2. Simplified Block Diagram for the PCM4222EVM Evaluation Module
SBAU124 – December 2006
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DIT
SW5
Reset
ADC
SW4
Reset
FDA
U1
PCM4222 F
P B
FDA
X1
Clock
Select
SW6
X2
J11
Ext Clock
DIT
SW3
DIT
S/M
SW1
and
SW2
To DIT
Introduction
J7
AES3
Out #1
J8
J9
AES3
Out #2
J10
Audio
J6
Serial
Port
Digital
J12
Power
DSD
J5
Data
Port
Modulator
Output
J4
Port
PCM4222EVM User's Guide
5
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