Texas Instruments PCM4202 Evaluation Module PCM4202EVM PCM4202EVM Datenbogen
Produktcode
PCM4202EVM
www.ti.com
3.7
Digital Interface Transmitter Configuration
Hardware Description and Configuration
Two Texas Instruments DIT4192 digital interface transmitters provide AES3-encoded outputs for
the PCM4202EVM. Switch SW3 is utilized to configure the transmitters. The outputs of the
transmitters are available at connectors J5 and J6, which are RCA phono jacks. These outputs are
designed for use with 75
the PCM4202EVM. Switch SW3 is utilized to configure the transmitters. The outputs of the
transmitters are available at connectors J5 and J6, which are RCA phono jacks. These outputs are
designed for use with 75
Ω
coaxial cable connections.
The transmitters are enabled using the DIT switch of SW3. The DIT switch operation is summarized
in
in
Table 8. Digital Interface Transmitter Configuration
DIT
Digital Interface Filter Function
LO
Enabled
HI
Disabled
The audio data format for the transmitters is hardwired for 24-bit I
2
S data format. When using the
transmitters, the PCM4202 audio data format must be set to 24-bit I
2
S, as shown in
Like the PCM4202, the DIT4192 transmitters must be configured for the proper master (or system) clock
frequency. The transmitter master clock is driven by the same source as the PCM4202 system clock, as
described in Section 3.4 of this document.
frequency. The transmitter master clock is driven by the same source as the PCM4202 system clock, as
described in Section 3.4 of this document.
summarizes the master clock options for the DIT4192
transmitters using switch SW3.
Table 9. Transmitter Master Clock Configuration
CLK1
CLK0
Transmitter MCLK Frequency
LO
LO
128f
S
LO
HI
256f
S
HI
LO
384f
S
HI
HI
512f
S
The DIT4192 transmitters may be operated in either Stereo or Mono mode. In Stereo mode, two channels
of audio data are transmitted at the input sampling frequency. In Mono mode, two consecutive samples of
only one channel are transmitted at one-half the input sampling rate. The Mono mode is useful for
performance testing with f
of audio data are transmitted at the input sampling frequency. In Mono mode, two consecutive samples of
only one channel are transmitted at one-half the input sampling rate. The Mono mode is useful for
performance testing with f
S
= 176.4kHz or f
S
= 192kHz with a system that can only accept only half these
rates. This is the case with the Audio Precision System Two Cascade or Cascade Plus test system, which
was used for factory performance testing of the PCM4202. Mono mode can be used in conjunction with
the Audio Precision Dual BNC digital input mode to test at sampling rates up to 216kHz.
was used for factory performance testing of the PCM4202. Mono mode can be used in conjunction with
the Audio Precision Dual BNC digital input mode to test at sampling rates up to 216kHz.
The MONO switch on SW3 is used to enable or disable Mono mode operation.
summarizes the
operation of the MONO switch.
Table 10. Transmitter Output Mode Configuration
MONO
Transmitter Output Mode
LO
Stereo Mode
Left and Right channel data are output on both J5 and J6
Left and Right channel data are output on both J5 and J6
HI
Mono Mode
Left channel data is output on J5
Right channel data is output on J6
Left channel data is output on J5
Right channel data is output on J6
PCM4202EVM User's Guide
12
SBAU103 – August 2004