DS4201

8 of 24

102099

MU:UID8 CONTROL RANGE Table 3

MIXER CONTROL RANGE

INPUT

CLUSTER

MIN

MAX

RES

DAC

-96.0 dB

(0xA000)

0.0 dB

(0x0000)

2.0 dB

(0x0200)

AUX

-32 dB

(0xE000)

30.0 dB

(0x1E00)

2.0 dB

(0x0200)

MIC

-32 dB

(0xE000)

30.0 dB

(0x1E00)

2.0 dB

(0x0200)

MIXER UNIT DEFAULT SETTINGS

The power–on default control settings of the MU are:

DAC channels: –20 dB

AUX channels: 0 dB

MIC channels: 0 dB

OUTPUT TERMINAL

The ADC Output Terminal (OT) is used to transmit audio information from the audio function. USB IN

endpoints as well as analog outputs are supported by the ADC specification. The DS4201 uses OT:TID4

to connect the output cluster from the MU:UID8 to the analog line out.

ENDPOINT 0

Control of an audio function is performed over the default pipe through device requests and interface end-

point and control settings. The ADC specification supports the standard device requests as defined in the

USB core specification. It also defines Audio Device class–specific requests to control device operation.

APPENDIX A contains USB core and ADC requests supported by the DS4201.

NOTE:

USB Core or ADC commands not listed in APPENDIX A are not supported by the DS4201. DS4201

response to these unsupported commands will be a STALL on the Endpoint 0 control pipe in accordance

with the USB Core and ADC specifications.

AUDIO STREAMING INTERFACE

The STREAMING interface is used to receive the digital PCM audio stream from the host and to control

host–de-vice data synchronization. Additionally, the STREAMING interface will support six alternative

settings:

ALT–0: (default setting) zero isochronous bandwidth

ALT–1: Asynch synchronization, 16–bit PCM stereo

ALT–2: Asynch synchronization, 16–bit PCM mono

ALT–3: Asynch synchronization, 8–bit PCM stereo

ALT–4: Asynch synchronization, 8–bit PCM mono

ALT–5: Adaptive synchronization, 16–bit PCM stereo

The zero isoch bandwidth setting is included to provide the host system with a mechanism to manage

USB bandwidth. This setting allows the host to reclaim isochronous bandwidth without deconfiguring the

audio device. For alternate settings 1–4, two USB endpoints exist: Endpoint 1 for an isochronous data

input (USB OUT from the host) with asynchronous synchronization, and Endpoint 2 for isochronous

synchronization feed-back. For alternate setting 5, one USB endpoint exists: Endpoint 1 for an