AD1846 Просмотр технического описания (PDF) - Analog Devices

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AD1846

Low Cost Parallel-Port 16-Bit SoundPort Stereo Codec

Analog Devices 

AD1846

Right Input Control (IXA3:0 = 1)

IXA3:0

1

Data 7

RSS1

Data 6

RSS0

Data 5

RMGE

Data 4

res

Data 3

RIG3

Data 2

RIG2

Data 1

RIG1

Data 0

RIG0

RIG3:0

res

RMGE

RSS1:0

Right Input Gain Select. The least significant bit of this gain select represents +1.5 dB. Maximum gain is +22.5 dB.

Reserved for future expansion. Always write a zero to this bit.

Right Input Microphone Gain Enable. Setting this bit will enable the +18 dB digital gain of the right mic input signal.

Right Input Source Select. These bits select the input source for the right channel gain stage preceding the right ADC.

0

Right Line Source Selected

1

Right Auxiliary 1 Source Selected

2

Right Microphone Source Selected

3

Right Post-Mixed DAC Output Source Selected

This register’s initial state after reset is “000x 0000.”

Left Auxiliary #1 Input Control (IXA3:0 = 2)

IXA3:0

2

Data 7

LMX1

Data 6

res

Data 5

res

Data 4

LX1A4

Data 3

LX1A3

Data 2

LX1A2

Data 1

LX1A1

Data 0

LX1A0

LX1A4:0 Left Auxiliary Input #1 Attenuate Select. The least significant bit of this gain/attenuate select represents –1.5 dB.

LX1A4:0 = 0 produces a +12 dB gain. LX1A4:0 = “01000” (8 decimal) produces 0 dB gain. Maximum attenuation is

–34.5 dB.

res

Reserved for future expansion. Always write zeros to these bits.

LMX1 Left Auxiliary #1 Mute. This bit, when set, will mute the left channel of the Auxiliary #1 input source. This bit is set to

“1” after reset.

This register’s initial state after reset is “1xx0 0000.”

Right Auxiliary #1 Input Control (IXA3:0 = 3)

IXA3:0

3

Data 7

RMX1

Data 6

res

Data 5

res

Data 4

RX1A4

Data 3

RX1A3

Data 2

RX1A2

Data 1

RX1A1

Data 0

RX1A0

RX1A4:0 Right Auxiliary Input #1 Attenuate Select. The least significant bit of this gain/attenuate select represents –1.5 dB.

RX1A4:0 = 0 produces a +12 dB gain. RX1A4:0 = “01000” (8 decimal) produces 0 dB gain. Maximum attenuation is

–34.5 dB.

res

Reserved for future expansion. Always write zeros to these bits.

RMX1 Right Auxiliary #1 Mute. This bit, when set, will mute the right channel of the Auxiliary #1 input source. This bit is set to

“1” after reset.

This register’s initial state after reset is “1xx0 0000.”

REV. A

–15–

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