AD1985 datasheet(24/48 Pages) AD

24 / 48 page

AD1985

Rev. A | Page 24 of 48

General Purpose Register (Index 0x20)

Reg Num

Name

D15 D14 D13 D12 D11

D10

D8 D7

D6 D5 D4 D3 D2 D1 D0 Default

0x20

General Purpose

DRSS1

DRSS0

MIX MS LPBK

0x0000

LPBK

Loopback Control. This bit enables the digital internal loopback from the ADC to the front DAC. This feature is

normally used for testing and troubleshooting. See LBKS bits in Register 0x74 for changing the loopback path to

use the surround or center/LFE DACs.

MIC Select. Selects MIC input into the record selector input and also selects the input to the analog mixer.

(See the 2CMIC [Bit D7 Register 0x76] to enable simultaneous dual microphone recording, and the OMS [Bit D9

The following chart shows which of the codec I/O pins are used for the microphone source from the various

settings of the microphone control bits.

OMS

2CMIC

Left Channel

Right Channel

MIC1 (mono)

MIC2 (mono)

MIC1 (stereo)

MIC2 (stereo)

MIC1 (stereo)

CENTER (mono)

LFE (mono)

CENTER (stereo)

LFE (stereo)

CENTER (stereo)

Mono Output Select. Selects mono output audio source.

0 = Mixer Output. Default.

1 = Selected MIC Channel (Selected Channel Is Unaffected by 2CMIC Setting).

MIX

OMS

Mono Output

Mixer_mono (default)

MIC1 (mono)

MIC2 (mono)

CENTER (mono)

MIX

LFE (mono)

DRSS[1:0]

Double Rate Slot Select. The DRSS bits specify the slots for the n + 1 sample outputs. PCM L (n + 1) and

PCM R (n + 1) data are by default provided in output slots 10 and 11.

00: PCM L, R n + 1 data is on slots 10, 11 (reset default).

01: PCM L, R n + 1 data is on slots 7, 8.

10: Reserved.

11: Reserved.

AD1985 датащи(PDF) 24 Page - Analog Devices

AD1985 датащи(HTML) 24 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48

датащи скачать

ссылки URL