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PCM2702EG4 Datasheet(PDF) 8 Page - Texas Instruments |
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PCM2702EG4 Datasheet(HTML) 8 Page - Texas Instruments |
8 / 17 page PCM2702 8 SBAS142A www.ti.com THEORY OF OPERATION USB INTERFACE The description of the USB interface complies with Univer- sal Serial Bus specification Rev. 1.0. Control and audio data are both transferred to the PCM2702 via D+ (pin 6) and D– (pin 7). All data to/from the PCM2702 are transferred at full-speed. VBUS (pin 8) and DGNDU (pin 9) are also connected to the USB bus. VBUS (pin 8) never consumes USB bus power, it is used only for detecting the connection of the USB bus. The following information is provided in the device descriptor. The Input Terminal is defined as “USB stream” (terminal type 0x0101). The Input Terminal can accept 2-channel audio streams comprised of left and right channel data. The Output Terminal is defined as a “speaker” (terminal type 0x0301). The Feature Unit supports the following sound control features. • Volume Control • Mute Control The built-in digital volume controller can be manipulated by an audio class specific request from 0.0dB to –64.0dB in steps of 1.0dB. Each channel can be set independently. The master volume control is also supported. The built-in digital mute controller can be manipulated by an audio class spe- cific request. A master mute-control request is acceptable. A request to an individual channel will be stalled and ignored. Interface #1 has three alternative settings. Alternative setting #0 is the Zero Bandwidth setting. Alternative setting #1 is the 16-Bit Stereo setting, and is an operational setting. Alternative setting #2 is the 16-Bit Monaural setting, and is also an operational setting. The PCM2702 has the following two endpoints. • Control Endpoint (EP #0) • Isochronous Audio Data Stream Endpoint (EP #2) The Control Endpoint is a default endpoint and is used to control all functions of the PCM2702 by the standard USB request and the USB audio class specific request. The Isochronous Audio Data Stream Endpoint is an audio sink endpoint, which receives the PCM audio data, and accepts the adaptive transfer mode. USB Revision 1.0 Device Class 0x00 (device defined interface level) Device Subclass 0x00 (not specified) Device Protocol 0x00 (not specified) Max Packet Size for Endpoint 0 8 byte Vendor ID 0x08BB Device ID 0x2702 Release 1.0 TABLE I. Device Definition. DEVICE CONFIGURATION Figure 1 illustrates USB audio function topology. The PCM2702 has two interfaces. Each interface is constructed by some alternative setting. Interface #0 has one alternative setting. Alternative setting #0 describes the standard audio control interface. The audio control interface is constructed by a terminal. The PCM2702 has the following three termi- nals. • Input Terminal (IT) • Output Terminal (OT) • Feature Unit (FU) Endpoint #0 PCM2702 Default Endpoint Endpoint #2 Audio Streaming Interface (IF #1) IT TID1 OT TID2 Standard Audio Control Interface (IF #0) FU UID3 Analog Out NOTE: IT = Input Terminal (Terminal ID #1); OT = Output Terminal (Terminal ID #2); FU = Feature Unit (Unit ID #3). FI |
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