CDB3318 Datasheet, PDF (4/16 Pages) Cirrus Logic – Evaluation Board for CS3318

CDB3318
The 10-pin, 2 column header, J88, provides unidirectional output access to the CS3318’s SPI MOSI and
CCLK signals, as well as its AD0, ENOut, and MUTE signals. All of the signals re-driven versions of those
present directly on their respective I/O pins on the CS3318. This header may be used to connect the serial
control signals between 2 or more CDB3318’s (out of J88 on one and in to J17 on another) for multiple
CS3318 SPI serial control evaluation.
1.5 Analog Inputs
RCA connectors supply the CS3318 analog inputs through single-ended passive circuits with no input filter-
ing. Refer to the CS3318 data sheet for the maximum input signal level.
Each analog input may be AC or DC coupled to its respective RCA connector. This selection is made via
the 2-pin headers labeled “DC Couple Input” and placed adjacent to each input connector on the board. To
DC couple an input connector, place a shunt across the respective header. To AC couple an input connec-
tor, remove the shunt from the respective header. By default, the input connectors are AC coupled to the
CS3318’s inputs.
1.6 Analog Outputs
The CS3318 analog outputs are routed through single-ended passive circuits with no output filtering and
connected to RCA jacks for easy evaluation.
Each analog output may be AC or DC coupled to its respective RCA connector. This selection is made via
the 2-pin headers labeled “DC Couple Output” and placed adjacent to each output connector on the board.
To DC couple an output connector, place a shunt across the respective header. To AC couple an output
connector, remove the shunt from the respective header. By default, the output connectors are AC coupled
to the CS3318’s outputs.
1.7 PC Interfaces
USB and RS-232 connections are provided to facilitate software control of the CS3318’s internal registers.
A graphical user interface is available for the CDB3318 to allow easy manipulation of the CS3318’s internal
registers. See the CS3318 datasheet for complete internal register descriptions.
To enable the CDB3318, simply connect the supplied USB cable from an available USB port on a PC to the
USB connector (J37), or alternatively connect a 9-pin serial cable from an available COM port on a PC to
the RS-232 connector (J42) and launch the Cirrus Logic FlexGUI software.
Refer to “PC Software Control” on page 5 for a description of the Graphical User Interface (GUI).
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