PCM2912A

SLES230A – SEPTEMBER 2008 – REVISED AUGUST 2015

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Input terminal #3 is defined as USB stream (terminal type 0x0101). Input terminal #3 can accept two-channel

audio streams constructed by the left and right channels. Output terminal #6 is defined as a speaker (terminal

type 0x0301). Input terminals #1 and #7 are defined as Microphone (terminal type 0x0201). Physically, these two

input terminals are the same input, but logically duplicated. Output terminal B is defined as a USB stream

(terminal type 0x0101). Output terminal B is a single-channel audio stream. Mixer unit #4 multiplexes the analog

input (sidetone) and the audio data of the digital-to-analog converter (DAC). Mixer unit A is placed in front of

output terminal B. Mixer unit A has no impact on recording data. Mixer units #4 and A do not have programming

capability.

Feature unit #5 supports the following sound control features for analog outputs:

•

Volume control

•

Mute control

The built-in volume controller can be manipulated by an audio-class-specific request from 0 dB to –76 dB in

steps of 1 dB. An individual (L and R) channel can be set for different values. The built-in mute controller can be

manipulated by an audio-class-specific request. Only the master mute control request is acceptable.

Feature unit #2 supports the following sound control features for analog input (sidetone):

•

Volume control

•

Mute control

The built-in volume controller can be manipulated by an audio-class-specific request from 0 dB to –76 dB in 1-dB

steps. Only the master volume control is acceptable. The built-in mute controller can be manipulated by audio-

class-specific request. Only the master mute control request is acceptable.

Feature unit #8 supports the following sound control features for analog input (microphone record input):

•

Volume control

•

Mute control

The built-in analog volume controller can be manipulated by an audio-class-specific request from +30 dB to –12

dB in 1-dB steps. The built-in mute controller can be manipulated by an audio-class-specific request. Only the

master mute control request is acceptable.

9.5.1.3 Interface #1

Interface #1 is the audio streaming interface for data output. Table 4 lists the three alternative settings for

Interface #1. Alternative setting #0 is the zero bandwidth setting. All other alternative settings are operational

settings.

Table 4. Interface #1 Alternative Settings

ALTERNATIVE

DATA FORMAT

TRANSFER MODE

SAMPLING RATE (kHz)

SETTING

00

Zero Bandwidth

8, 11.025, 16, 22.05, 32, 44.1,

01

16 bit

Stereo

2s complement (PCM)

Adaptive

48

8, 11.025, 16, 22.05, 32, 44.1,

02

16 bit

Mono

2s complement (PCM)

Adaptive

48

9.5.1.4 Interface #2

Interface #2 is the audio streaming interface for data output. Table 5 shows the two alternative settings for

Interface #2. Alternative setting #0 is the Zero Band Width setting. Alternative setting #1 is an operational setting.

Table 5. Interface #2 Alternative Settings

ALTERNATIVE

DATA FORMAT

TRANSFER MODE

SAMPLING RATE (kHz)

SETTING

00

Zero Bandwidth

8, 11.025, 16, 22.05, 32,

01

16 bit

Mono

2s complement (PCM)

Asynchronous

44.1, 48

22

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