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PCM2702EG4 Datasheet(PDF) 8 Page - Texas Instruments

Part # PCM2702EG4
Description  DIGITAL-TO-ANALOG CONVERTER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

PCM2702EG4 Datasheet(HTML) 8 Page - Texas Instruments

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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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