PCM1738E2K BURR-BROWN [Burr-Brown Corporation], PCM1738E2K Datasheet - Page 17

• Manufacturer Part Number: PCM1738E2K
• Description: 24-Bit, 192kHz Sampling, Advanced Segment, Audio-Stereo DIGITAL-TO-ANALOG CONVERTER
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

PCM1738
REGISTER DEFINITIONS
REGISTER 16
REGISTER 17
W/R
ATL/R[7:0]
The following table shows attenuator levels for various settings.
REGISTER 18
W/R
ATLD
SBAS174B
ATL/R[7:0]
1111 1111
1111 1110
1111 1101
0001 0000
0000 1111
0000 1110
0000 0000
Read/Write Mode Control
When W/R = 0, a Write operation is performed.
When W/R = 1, a Read operation is performed.
Default Value: 0
Attenuation Load Control
This bit is Read/Write.
Default Value: 0
The ATLD bit is used to enable loading of attenuation data set by Register 16 through 17. When ATLD = 0,
the attenuation settings remain at the previously programmed level, ignoring new data loaded to Register 16
through 17. When ATLD = 1, attenuation data written to Register 16 through 17 is loaded normally.
Read/Write Mode Select
When W/R = 0, a Write operation is performed.
When W/R = 1, a Read operation is performed.
Default Value: 0
Digital Attenuation Level Setting
These bits are Read/Write.
Default Value: 1111 1111
Each DAC output has a digital attenuator associated with it. The attenuator may be set from 0db to –120dB,
in 0.5dB steps. Alternatively, the attenuator may be set to infinite attenuation (or mute).
The attenuation data for each channel can be set individually. However, the data load control (ATLD bit of
Control Register 18) is common to both attenuators. ATLD must be set to “1” in order to change an
attenuator’s setting. The attenuation level may be set using the following formula:
B15
W/R
W/R
B15
W/R
ATLD = 0
ATLD = 1
•
•
•
•
B
B
B
B
B
B
B
B14
B14
0
0
0
Attenuation Level (dB) = 0.5dB • (ATL/R[7:0]DEC – 255)
B13
B13
0
0
0
Attenuation Control Disabled (default)
Attenuation Control Enabled
Where: ATL/R[7:0]DEC = 0 through 255
B12
B12
1
1
1
B
•
•
•
•
B11
B11
For: ATL/R[7:0]DEC = 0 through 14, the attenuator is set to infinite attenuation.
0
0
0
Decimal Value
B10
B10
0
0
0
255
254
253
16
15
14
0
B9
B9
0
0
1
B8
B8
0
1
0
ATR7
ATLD
ATL7
B7
B7
ATL6
ATR6
FMT2
B6
B6
ATL5
ATR5
FMT1
0dB, No Attenuation (default)
B5
B5
Attenuator Level Setting
ATL4
ATR4
FMT0
B4
B4
119.5dB
120.0dB
–0.5dB
–1.0dB
Mute
Mute
DMF1
ATR3
ATL3
B3
B3
•
•
•
•
ATR2
DMF0
ATL2
B2
B2
ATR1
ATL1
DME
B1
B1
MUTE
ATR0
ATL0
B0
B0
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