Cirrus Logic CDB42L56 - Manual (Page 4)

4 DS851DB1
CDB42L56
1. SYSTEM OVERVIEW
The CDB42L56 evaluation platform provides analog and digital interfaces to the CS42L56 and allows for external
DSP and I²C
interconnects to the board. On-board peripherals are powered either from the USB connection or from
an external +5 V supply. On-board voltage regulators provide power to the digital and analog cores of the CS42L56.
The CDB42L56 is configured using Cirrus Logic’s Windows-compatible FlexGUI software to read/write to device
registers.
This section describes the various components on the CDB42L56 and how they are used with the CS42L56. Section
2 on page 8 is a simplified quick connect guide provided for user convenience and may be used to quickly configure
the CS42L56. Section 3 on page 9 describes some of the configurations available for transmitting and receiving au-
dio signals. Section 4 on page 11 provides software configuration details. Section 5 on page 18 provides a descrip-
tion of all stake headers and connectors, including the default factory settings of all jumpers. Section 6 on page 21
provides typical performance plots. The CDB42L56 schematic and layout set is shown in Figures 35 through 44 .
1.1 Control Port and Board Configuration
The CDB42L56 evaluation board must be programmed using the Windows compatible software (Cirrus Log-
ic FlexGUI) provided. This software allows the user to program the registers of all the programmable com-
ponents on the board using an I²C interface.
The GUI interfaces with an on-board micro controller through either the USB or the serial port connector.
For a detailed explanation on software controls, refer to
Section 4 on page 11.
Alternatively, the I²C interface to the CS42L56 can be directly accessed through an I/O header (J109) to
accept external timing and signals in a user application during system development.
1.2 Power
Power is supplied to the evaluation board through either the +5.0 V test points or the VBUS supply from the
USB. NOTE: The minimum current required for board operation is approximately 300 mA. It may therefore
be necessary to connect the CDB42L56 directly to the USB port on the PC as opposed to a hub or keyboard
port where the current might be limited.
Jumpers connect the CS42L56’s supplies to a low dropout regulated voltage of +1.8 V, +2.5 V or +3.3 V for
VL and +1.8 V or +2.5 V for VLDO, VA and VCP. A selection for a 1.8 V supply from a buck regulator is also
available, providing a more efficient means of evaluating the CS42L56’s performance when powered from
batteries (3 AAA battery connectors are available on the bottom side of the CDB).
For current measurement purposes only, a 1 ohm series resistor is connected to each supply. The current
is easily calculated by measuring the voltage drop across this resistor. NOTE: The stake headers connected
in parallel with these resistors must be shunted with the supplied jumper during normal operation.
WARNING: Please refer to the CS42L56 data sheet for allowable voltage levels.
1.3 Digital Input
1.3.1 CS8416 S/PDIF Digital Audio Receiver
The CS8416 S/PDIF receiver converts an incoming S/PDIF data input stream into PCM data for the
CS42L56 (through the “Transmit” (Tx) Sample Rate Converter (SRC)).
A complete description of the CS8416 ( Figure 36 on page 29 ) and a discussion of the digital audio inter-
face can be found in the CS8416 data sheet.