WM8973-EV1M
w
Rev 1.0, February 2005
13
The ‘Submit All’ button will submit values to every register of the WM8973. The ‘Reset’
button writes to the reset register (R15) but does not reset the control panel values. If the
previous values are to be resubmitted then the ‘Submit All’ button should be pressed, if the
user would like to start afresh then the ‘Reset Software Panel Settings’ button should also be
pressed. Pressing this button does not write to the device, it only resets the panel settings to
their default state. Left clicking on the Wolfson logo will open the PCs default web browser
and go to the Wolfson Microelectronics website (‘
www.wolfsonmicro.com
’). The DAC, ADC
and Line setup buttons have also been provided as a quick start approach. Pressing either of
these buttons will power up the DAC, ADC or Line signal paths in a known state as described
in the following pages.
Important:
The CS8427 SPDIF decoder IC will only work at a rate of 256fs. This will limit
the sample rates that may be set using the WM8973 unless an external source is used to
supply signals directly to the relevant pins of header H1 or taking the signals from the
relevant pins of header H2.
DAC SUBMIT SETUP
By pressing the ‘DAC Setup’ button, the software writes to the device setting the following
path: SPDIF_In through the DAC to the L/ROUT1 and L/ROUT2 outputs. The default format
setting is 24-bit, I
2
S. Table 6 lists the required board settings to allow this signal path to be
used. This button is intended to ease the initial use of the WM8973 until the user becomes
familiar with both device and software operation.
Figure 5 Recommended DAC Setup
Summary of Contents for WM8973-EV1B
Page 1: ...WM8973 EV1M Evaluation Board User Handbook Rev 1 0...
Page 3: ...WM8973 EV1M w Rev 1 0 February 2005 3 EVALUATION SUPPORT 44 IMPORTANT NOTICE 45 ADDRESS 45...
Page 21: ...WM8973 EV1M w Rev 1 0 February 2005 21 SCHEMATIC LAYOUT Figure 13 Functional Diagram...
Page 22: ...WM8973 EV1M w Rev 1 0 February 2005 22 Figure 14 Digital Input...
Page 23: ...WM8973 EV1M w Rev 1 0 February 2005 23 Figure 15 Software Control...
Page 24: ...WM8973 EV1M w Rev 1 0 February 2005 24 Figure 16 Level Shift...
Page 25: ...WM8973 EV1M w Rev 1 0 February 2005 25 Figure 17 Analogue Input...
Page 26: ...WM8973 EV1M w Rev 1 0 February 2005 26 Figure 18 WM8973...
Page 27: ...WM8973 EV1M w Rev 1 0 February 2005 27 Figure 19 Analogue Output...
Page 28: ...WM8973 EV1M w Rev 1 0 February 2005 28 Figure 20 Power...
Page 29: ...WM8973 EV1M w Rev 1 0 February 2005 29 WM8973 EV1B PCB LAYOUT Figure 21 Top Layer Silkscreen...
Page 30: ...WM8973 EV1M w Rev 1 0 February 2005 30 Figure 22 Top Layer...
Page 31: ...WM8973 EV1M w Rev 1 0 February 2005 31 Figure 23 Bottom Layer...
Page 32: ...WM8973 EV1M w Rev 1 0 February 2005 32 Figure 24 Bottom Layer Silkscreen...