Cirrus-logic CDB5346 User Manual download pdf (Page 4)

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CDB5346

1.5 CS2000

The CS2000-CP, U7, provides the master clock source to the CDB5346.

The CS2000-CP is a highly configurable clock synthesizer and jitter reducing clock multiplier. Simple scripts

have been pre-configured to generate the necessary configuration settings for the CS2000-CP. For a more

in depth look a this device please see the CS2000-CP data sheet.

1.6 External Control Headers

The evaluation board has been designed to allow interfacing with external systems via the headers J19, and

J21.

The 8-pin, 2 row header, J21, provides access to the serial audio signals required to interface to the serial

audio port of the CS5346 with a DSP (see Figure 7 on page 14).

The direction of the signals on header J21 can be configured using the controls located within the Board

Controls group box on the CDB5346 Controls tab in the provided GUI software.

The 15-pin, 3 row header, J19, allows the user bidirectional access to the SPI/I²C control signals by simply

removing all the shunt jumpers from the “PC” position. The user may then choose to connect a ribbon cable

to the “EXTERNAL CONTROL” position. A single “GND” row for the ribbon cable’s ground connection is

provided to maintain signal integrity. Two unpopulated pull-up resistors are also available should the user

choose to use the CDB for the I²C power rail.

1.7 Analog Inputs

RCA connectors supply the CS5346 analog inputs through single-ended, unity gain, passive circuits. Refer

to the CS5346 data sheet for the ADC full-scale input level and input impedance.

1.8 Analog Outputs

The CS5346 PGA analog outputs are routed through a source-follower op-amp to provide a low impedance

drive and to observe the current draw limitations of the PGA output pins. The output of the amp is connected

to RCA jacks for easy evaluation.

1.9 Serial Control Port

A graphical user interface is included with the CDB5346 to allow easy manipulation of the registers in the

CS5346, CS8406, and CS2000-CP. See the device-specific data sheets for the CS5346, CD8406, and

CS2000-CP internal register descriptions.

Connecting a USB cable to connector J17 and launching the Cirrus Logic FlexGUI software (FlexLoad-

er.exe) will enable the CDB5346.

Refer to “PC Software Control” on page 6 for a description of the Graphical User Interface (GUI).

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Cirrus-logic CDB5346 User Manual Page 4