AD1845

–17–

REV. C

RSS1

RSS0

Right Input Source

0

0

Right Line Source Selected

0

1

Right Auxiliary 1 Source Selected

1

0

Right Microphone Source Selected

1

1

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

Data 7

Data 6

Data 5

Data 4

Data 3

Data 2

Data 1

Data 0

2

LMX1

res

res

LX1A4

LX1A3

LX1A2

LX1A1

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 attenua-

tion is –34.5 dB. See Figure 10.

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

powers up set.

This register’s initial state after reset is “1xx0 1000.”

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

IXA3:0

Data 7

Data 6

Data 5

Data 4

Data 3

Data 2

Data 1

Data 0

3

RMX1

res

res

RX1A4

RX1A3

RX1A2

RX1A1

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. See Figure 10.

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 powers up set.

This register’s initial state after reset is “1xx0 1000.”

Left Auxiliary #2 Input Control (IXA3:0 = 4)

IXA3:0

Data 7

Data 6

Data 5

Data 4

Data 3

Data 2

Data 1

Data 0

4

LMX2

res

res

LX2A4

LX2A3

LX2A2

LX2A1

LX2A0

LX2A4:0

Left Auxiliary Input #2 Attenuate Select. The least significant bit of this gain/attenuate select represents 1.5 dB.

LX2A4:0 = 0 produces a +12 dB gain. LX2A4:0 = “01000” (8 decimal) produces 0 dB gain. Maximum attenua-

tion is –34.5 dB. See Figure 10.

res

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

LMX2

Left Auxiliary #2 Mute. This bit, when set to 1, will mute the left channel of the Auxiliary #2 input source. This

bit powers up set.

This register’s initial state after reset is “1xx0 1000.”

Right Auxiliary #2 Input Control (IXA3:0 = 5)

IXA3:0

Data 7

Data 6

Data 5

Data 4

Data 3

Data 2

Data 1

Data 0

5

RMX2

res

res

RX2A4

RX2A3

RX2A2

RX2A1

RX2A0