4

DS702DB2

CDB3308

The 10-pin, 2 column header, J88, provides unidirectional output access to the CS3308’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 CS3308. This header may be used to connect the serial

control signals between 2 or more CDB3308’s (out of J88 on one and in to J17 on another) for multiple

CS3308 SPI serial control evaluation.

1.5

Analog Inputs

RCA connectors supply the CS3308 analog inputs through single-ended passive circuits with no input filter-

ing. Refer to the CS3308 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

CS3308’s inputs.

1.6

Analog Outputs

The CS3308 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 CS3308’s outputs.

1.7

PC Interfaces

USB and RS-232 connections are provided to facilitate software control of the CS3308’s internal registers.

A graphical user interface is available for the CDB3308 to allow easy manipulation of the CS3308’s internal

registers. See the CS3308 datasheet for complete internal register descriptions.

To enable the CDB3308, 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).