UAC

UAC

UAC

UAC

Overview

• It adopted the Texas Instruments single-chip PCM2912A, USB stereo audio codec with a USB, 2.0-compliant, full-speed protocol controller and an Active Front End (AFE) function for headset applications.
• The USB protocol controller works with no softwarecode, but USB descriptors can be modified on
• request. The PCM2912A employs SpAct?architecture, TI’s unique system that recovers the audio clock from USB packet data. On-chip analog PLLs with SpAct enables independent playback and
• record sampling rates with low clock jitters.

Features

On-Chip USB Interface:

• With Full-Speed Transceivers
• Fully Compliant With USB 2.0 Specification
• Certified By USB-IF
• Partially Programmable Descriptors
• Adaptive Isochronous Transfer for Playback
• Asynchronous-Isochronous Transfer for Record
• Bus Powered

16-Bit Delta-Sigma ADC and DAC

Sampling Rate:8, 11.025, 16, 22.05, 32, 44.1, or 48 kHz

Mono ADC with Microphone Input:

• Analog Performance at VBUS = 5 V:
• THD+N: 0.01%
• SNR: 92 dB
• Dynamic Range: 90 dB

Stereo DAC With Headphone Output:

• Analog Performance at VBUS = 5.0 V
• THD+N: 0.01% (RL > 10 kΩ)
• THD+N: 0.02% (RL = 32 Ω)
• SNR: 92 dB
• Dynamic Range: 90 dB

Packin List

• 1 x PCM2912-UAC USB Audio Card

Note: The Raspberry Pi 3 model b motherboard is not included.

Support Windows System

Testing under Raspberry

1/ Viewing system playback device:

pi@raspberrypi:~$ sudo aplay -l

**** List of PLAYBACK Hardware Devices ****

card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]

 Subdevices: 8/8

 Subdevice #0: subdevice #0

 Subdevice #1: subdevice #1

 Subdevice #2: subdevice #2

 Subdevice #3: subdevice #3

 Subdevice #4: subdevice #4

 Subdevice #5: subdevice #5

 Subdevice #6: subdevice #6

 Subdevice #7: subdevice #7

card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]

 Subdevices: 1/1

 Subdevice #0: subdevice #0

card 1: Device [PDP Audio Device], device 0: USB Audio [USB Audio]

 Subdevices: 0/1

 Subdevice #0: subdevice #0

2/ Viewing system record device:

**** List of CAPTURE Hardware Devices ****

card 1: Device [PDP Audio Device], device 0: USB Audio [USB Audio]

 Subdevices: 1/1

 Subdevice #0: subdevice #0

3/ Playback test:

pi@raspberrypi:~$ speaker-test -Dplughw:CARD=Device -c2 –twav

you can hear : Front Left Front Right from headset.

4/ Record test:

We can use below instruction record the MIC input to file test.wav.

pi@raspberrypi:~$ arecord -Dplughw:CARD=Device -fcd –c1 -twav test.wav

Testing under Raspberry

• 1/ Download debian system, burn into TF card.
• 2/ Install the music player：

Sudo apt-get install Qmmp. After the installation ,we can find the player under the menu bar

• 3/ Set UAC Module (PDP Audio Card） as default system Audio card in Preferences，and reboot

Download

User Manual: File:UAC manual-1.pdf

PCM2912A DATA: File:PCM2912A.pdf