AD1845 Analog Devices, AD1845 Datasheet - Page 18

• Manufacturer Part Number: AD1845
• Description: Parallel-port 16-Bit Soundport Stereo Codec
• Manufacturer: Analog Devices

AD1845
RX2A4:0
res
RMX2
This register’s initial state after reset is “1xx0 1000.”
LDA5:0
res
LDM
This register’s initial state after reset is “1x00 0000.”
RDA5:0
res
RDM
This register’s initial state after reset is “1x00 0000.”
Left DAC Control (IXA3:0 = 6)
Right DAC Control (IXA3:0 = 7)
IXA3:0
IXA3:0
6
7
Right Auxiliary Input #2 Attenuate Select. The least significant bit of this gain/attenuate select represents
Reserved for future expansion. Always write zeros to these bits.
Right Auxiliary #2 Mute. This bit, when set, will mute the right channel of the Auxiliary #2 input source. This
Left DAC Attenuate Select. The least significant bit of this gain/attenuate select represents 1.5 dB. Maximum
Reserved for future expansion. Always write a zero to this bit.
Left DAC Mute. This bit, when set to 1, will mute the left DAC output. This bit powers up active.
Right DAC Attenuate Select. The least significant bit of this gain/attenuate select represents 1.5 dB. Maximum
Reserved for future expansion. Always write a zero to this bit.
1.5 dB. RX2A4:0 = 0 produces a +12 dB gain. RX2A4:0 = “01000” (8 decimal) produces 0 dB gain.
Maximum attenuation is –34.5 dB. See Figure 10.
bit powers up set.
attenuation is –94.5 dB. See Figure 7.
attenuation is –94.5 dB. See Figure 7.
Right DAC Mute. This bit, when set to 1, will mute the right DAC output. This bit powers up active.
A5
0
0
0
0
0
0
0
0
0
0
0
0
•
•
•
1
1
1
1
1
1
1
1
1
1
1
1
Data 7
Data 7
LDM
RDM
A4
0
0
0
0
0
0
0
0
0
0
0
0
•
•
•
1
1
1
1
1
1
1
1
1
1
1
1
Data 6
Data 6
res
res
Figure 7. Mix Gain Level Setting: DAC
A3
0
0
0
0
0
0
0
0
1
1
1
1
•
•
•
0
0
0
0
1
1
1
1
1
1
1
1
Data 5
Data 5
LDA5
RDA5
A2
0
0
0
0
1
1
1
1
0
0
0
0
•
•
•
1
1
1
1
0
0
0
0
1
1
1
1
–18–
Data 4
Data 4
LDA4
RDA4
A1
0
0
1
1
0
0
1
1
0
0
1
1
•
•
•
0
0
1
1
0
0
1
1
0
0
1
1
Data 3
Data 3
LDA3
RDA3
A0
0
1
0
1
0
1
0
1
0
1
0
1
•
•
•
0
1
0
1
0
1
0
1
0
1
0
1
Data 2
Data 2
LDA2
RDA2
1–1.0 dB
1–1.5 dB
1–3.0 dB
1–4.5 dB
1–6.0 dB
1–7.5 dB
1–9.0 dB
–10.5 dB
–12.0 dB
–13.5 dB
–15.0 dB
–16.5 dB
•
•
•
– 78.0 dB
– 79.5 dB
– 81.0 dB
– 82.5 dB
– 84.0 dB
– 85.5 dB
– 87.0 dB
– 88.5 dB
– 90.0 dB
– 91.5 dB
– 93.0 dB
– 94.5 dB
Mix Gain
Data 1
Data 1
LDA1
RDA1
Data 0
LDA0
Data 0
RDA0
REV. B