User guide

UG-564 Evaluation Board User Guide
Rev. 0 | Page 8 of 32
CONNECTING ANALOG AUDIO CABLES
There are two forms of the analog outputs of the ADAU196xA
evaluation board: differential and single ended.
The board comes standard with the single-ended outputs
appearing on through-hole test points as well as on the TRS
mini connectors.
The single-ended outputs of the ADAU196xA drive the
connectors directly, through a simple 1-pole RC filter with
appropriate ac coupling.
To evaluate the differential outputs, one can modify the board
to accomplish this with a little soldering and a few parts.
MODIFICATION FOR DIFFERENTIAL OUTPUT
The ADAU196xA evaluation board can be modified to be used
differentially.
See Figure 19 for the schematic of the standard filter. To modify
for balanced operation, perform the following steps for each
channel:
1. Remove R6 (0 Ω jumper).
2. Change R1 from 470 Ω to 237 Ω (0402).
3. Add R2 (237 Ω, 0402).
4. Add C3 (10 µf).
5. Add R4 (49.9 kΩ, 0402).
Figure 19. Typical Evaluation Board Filter
MODIFICATION TO USE THE N OUTPUT
The ADAU196xA evaluation board can be modified to use the
DACN output instead of the DACP output. Should you need
to invert all the channels, it is recommended to do so in the
software using the DAC CONTROL 2 Register or by inverting
the I
2
S data stream.
See Figure 19 for the schematic of the standard filter. To modify
to use the N output, perform the following steps for each
channel:
1. Move R6 over to R5 (0 Ω jumper).
2. Move R1 over to R2 (470 Ω).
3. Move C2 over to C3 (10 µF).
4. Move R3 over to R4 (49.9 kΩ).
5. Install a jumper between the N and P output test points.
Note that if new parts are to be used for R2, R4, R5, and C3,
then R1, R3, R6, and C2 must be removed.
+
+
R1
470Ω
R2
OPEN
R3
49.9kΩ
R4
OPEN
R5
OPEN
R6
0Ω
C1
2.7nF
C2
C3 OPEN
DACP
DACN
OUTP
OUTN
10µF
11588-019