ADLINK LittleBoard 735 - Manual (Page 40)

Chapter 3 Hardware
34 Reference Manual LittleBoard 735
USB4 and USB5
Table 3-12 lists the USB4 and USB5 pin signals which use 10 pins, 2 rows, odd/even sequence (1, 2) with
0.079" (2mm) pitch.
Note: The shaded table cells denote power or ground.
Audio Interface
The audio solution on the LittleBoard 735 is provided by the Realtek ALC203-LF audio CODEC. The chip
is defined by AC97 and is revision 2.2 compliant. The audio interface signals are supplied to the 26-pin
2mm connector (J9). Refer to the following list for the Audio CODEC (ALC203-LF) features.
• Analog Mixer Dynamic Range 97dB (typ)
• D/A Dynamic Range 89dB (typ) and A/D Dynamic Range 90dB (typ)
• AC’97 Rev 2.1 compliant
• High quality Sample Rate Conversion (SRC) from 4kHz to 48kHz
• 3D Sound circuitry and PC-Beep passthrough to Line Out while reset is held active low
• True Line Level Output with volume control independent of Line Out
Table 3-13 describes the pin signals of the audio interface which uses 26 pins, 2 rows, odd/even sequence (1,
2) with 0.079" (2mm) pitch.
Table 3-12. USB 4 & 5 Interface Pin Signals (J39)
Pin # Signal Description
1 USBPWR4 +5 volts power, USB 4
2 USBPWR5 +5 volts power, USB 5
3 USB4- USB 4 Data Negative
4 USB5- USB 5 Data Negative
5 USB4+ USB 4 Data Positive
6 USB5+ USB 5 Data Negative
7 USB GND4 USB 4 Ground
8 USB GND5 USB 5 Ground
9 USB GND4 USB 4 Ground
10 USB GND5 USB 5 Ground
Table 3-13. Audio Interface Pin Signals (J9)
Pin # Signal Description
1 AUX_L Auxiliary Audio I/O signal left channel
2 AUX_GND Auxiliary Audio ground
3 VIDEO_R Video Audio I/O signal right channel
4 CD_L CD-ROM signal left channel
5 CD_GND CD-ROM Audio ground
6 CD_R CD-ROM signal right channel
7 LINE_IN_L Line In signal left channel
8 LINE_IN_GND Line In Audio ground
9 LINE_IN_R Line In signal right channel
10 MIC1 Microphone In signal 1 or left channel