AD1845 Analog Devices, AD1845 Datasheet - Page 27

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

REV. B
res
FREN
MIXPWD
DACPWD
ADCPWD
This register’s initial state after reset is “000x 0xxx.”
NOTE: Changing CFMT, CC/L, CS/M, requires the Mode Change Enable (MCE) state or setting CEN = 0.
res
CS/M
CC/L
CFMT
This register’s initial state after reset is “x000 xxxx.”
Power-Down Control Register (IXA3:0 = 27)
Capture Data Format Control Register (IXA3:0 = 28)
IXA3:0
IXA3:0
27
28
Reserved for future expansion. Always write zeros to these bits.
Frequency Select Register Enable. In MODE2, selecting this bit will turn on the Frequency Select Registers (see
indirect registers 22 and 23) and disable CFS2:0.
0
1
Mixer Power Down. The DAC and the output mixer are powered down, and the DAC sample clock is turned off.
DAC Power Down. The DAC is powered down and the DAC sample clock is turned off.
ADC Power Down. The ADC is powered down and the ADC sample clock is turned off.
Reserved for future expansion. Always write zeros to these bits.
Capture Stereo/Mono Select. Setting this bit determines how the captured audio data will be formatted. In the
Mono mode, valid information is captured on the “left” channel, and the “right” channel data is not valid.
0
1
Capture Companding/Linear Select. This bit is set to determine linear, -Law or A-Law companding. See Figure
12 for CFMT and CC/L bit settings that determine the audio data type capture format.
Capture Data Format. This bit is set to format the data being captured in MODE 2. See Figure 12 for CFMT
and CC/L bit settings that determine the capture audio data type format.
MIA3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
ADCPWD
Data 7
Data 7
CFS Active.
Frequency Select Registers Active, CFS disabled.
Mono Format
Stereo Format
res
MIA2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
DACPWD
Data 6
Data 6
CFMT
Figure 11. Mono Attenuation
MIXPWD
Data 5
Data 5
CC/L
MIA1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
–27–
Data 4
Data 4
CS/M
res
MIA0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Data 3
Data 3
FREN
res
MONO Attenuation
–3.0 dB
–6.0 dB
–9.0 dB
–12.0 dB
–15.0 dB
–18.0 dB
–21.0 dB
–24.0 dB
–27.0 dB
–30.0 dB
–33.0 dB
–36.0 dB
–39.0 dB
–42.0 dB
–45.0 dB
0.0 dB
Data 2
Data 2
res
res
Data 1
Data 1
res
res
Data 0
Data 0
AD1845
res
res