Datasheet

Preliminary Technical Data EVAL-AD1940AZ
Rev. PrA | Page 9 of 30
EXTERNAL DIGITAL AUDIO (I
2
S/TDM) INPUTS
The EVAL-AD1940AZ has a digital interface input header (J22)
with connections for MCLK, LRCLK, BCLK, and four serial
data lines, allowing for a total of 8 channels of serial audio input
(I
2
S, right-justified, or left-justified) or up to 16 channels when
TDM modes are used. In order to input the audio data to the
AD1940 DSP, it must be routed appropriately using the audio
data routing jumpers.
Proper configuration for inputting all I
2
S/TDM audio to the
DSP is shown in Figure 11.
J4 J5 J6 J
7
SDATA_IN0 SDATA_IN1 SDATA_IN2 SDATA_IN3
INTF_IN0 INTF_IN1 INTF_IN2 INTF_IN3
Figure 11. Input Routing Jumpers - I
2
S/TDM Configuration
When data is supplied on the digital interface input header,
there are two options for LRCLK and BCLK routing. First, the
AD1939 can be the clock master. This configuration is shown in
Figure 12.
J9J8
BCLK_INLRCLK_IN
1939_BCLK1939_L RCLK
Figure 12. LRCLK_IN/BCLK_IN Routing Jumpers - I
2
S/TDM Configuration -
AD1939 Master
Alternatively, the LRCLK and BCLK signals can be taken from
an external source over the LRCLK_IN and BCLK_IN pins of
the digital interface input header J22. This configuration is
shown in Figure 13.
J9J8
BCLK_INLRCLK_IN
BCLK_INTF_INLRCLK_INTF_IN
Figure 13. LRCLK_IN/BCLK_IN Routing Jumpers - I
2
S/TDM Configuration -
External Master
With the jumpers configured as shown in Figure 12 and Figure
13, the external I
2
S input signals will appear in SigmaStudio as
input channels 0-7, as shown in Figure 14.
EXTERNALI
2
SINPUT0
EXTERNALI
2
SINPUT1
EXTERNALI
2
SINPUT2
EXTERNALI
2
SINPUT3
EXTERNALI
2
SINPUT
4
EXTERNALI
2
SINPUT5
EXTERNALI
2
SINPUT6
EXTERNALI
2
SINPUT7
Figure 14. I
2
S Inputs in SigmaStudio
If the input serial ports are configured in TDM modes (allowing
for up to 16 channels), the input channels will appear in
SigmaStudio as input channels 0-15, as shown in Figure 15.
EXTERNALTDMINPUT0
EXTERNALTDMINPUT1
EXTERNALTDMINPUT2
EXTERNALTDMINPUT3
EXTERNALTDMINPUT4
EXTERNALTDMINPUT5
EXTERNALTDMINPUT6
EXTERNALTDMINPUT7
EXTERNALTDMINPUT8
EXTERNALTDMINPUT9
EXTERNALTDMINPUT10
EXTERNALTDMINPUT11
EXTERNALTDMINPUT12
EXTERNALTDMINPUT13
EXTERNALTDMINP
UT1
4
EXTERNALTDMINPUT15
Figure 15. TDM Inputs in SigmaStudio
S/PDIF RECEIVER
The EVAL-AD1940AZ has an S/PDIF receiver with both optical
and coaxial connections, allowing for a total of 2 channels of
S/PDIF audio to be input to the AD1940. In order to input the
audio data to the AD1940 DSP, it must be routed appropriately
using the audio data routing jumpers.
Proper configuration for inputting all S/PDIF audio to the DSP
is shown in Figure 16.