Cirrus Logic CDB42L52 - Manual (Page 5)

DS680DB1 5
CDB42L52
1.9 Analog Inputs
Four stereo jack connectors supply the AC coupled line-level analog inputs to the CS42L52. Differential or
single ended microphone inputs may be connected to J45 or J50 in place of line inputs. Stake headers J46
J38, J51 and J49 allow the user to select (with jumpers installed) the CS42L52 as the microphone bias
source for each microphone input.
Figure 8 on page 17 illustrates how the analog inputs are connected and routed. Table 2 on page 14 details
the jumper selections. The CS42L52 data sheet specifies the allowed full scale input voltage level.
1.10 Analog Outputs
The CDB42L52 has a Stereo Headphone/Line output jack and a separate Stereo Headphone (HP) output
jack for the ground centered DAC output. Stake headers are provided to allow the user to select a 16
Ω or
a 32 Ω resistive load connected to the DAC output or a filtered or unfiltered output for the HP/Line jack out-
put. The resistive load can be selected to evaluate the CS42L52 drive capabilities. When connecting head-
phones to either output jack, the resistive load should be disconnected by removing the jumpers on each
stake header.
The CDB42L52 also has A/B speaker output banana jacks (2 per A or B channel) and 1/8“ jack outputs. (1
per A or B channel). Stake headers on each channel (A or B) connect the CS42L52 Class D speaker driver
amp outputs to either banana jack or 1/8” jack output in a number of configurations. Audio jack stake header
selections include RC filtered or unfiltered outputs. Banana jack output selections include RLC filtered, un-
filtered and either full or half bridge output modes. The red banana jacks designate the positive speaker ter-
minal connection and the black jacks designate the negative terminal connection.
1.11 Control Port Connectors
The graphical user interface for the CDB42L52 (Cirrus Logic Flex GUI) allows the user to configure the
CS42L52 registers and other component registers via the onboard I²C control bus. The GUI interfaces with
the CDB via the USB connection to a PC.
Section 2. “Software Mode Control” on page 6 provides a descrip-
tion of the Graphical User Interface (GUI).
1.11.1 USB Connector
Connecting a USB port cable from a PC to the USB connector on the board and launching the Cirrus
FlexGUI software enables the CDB42L52. Note: The USB port connection also provides DC power to the
board (except for VP). The minimum current required is approximately 300 mA. It may, therefore, be nec-
essary to connect the CDB42L52 directly to the USB port on the PC as opposed to a hub or keyboard port
where current may be limited.