Cirrus Logic CS4234 - Manual (Page 63)

DS899F1 63
CS4234
6.15.5 DAC5 Configuration and Filter Selection
Selects the filtering applied to the DAC5 data or configures the DAC5 Path used to generate a tracking
power supply reference. If placed into Tracking Power Supply mode, an interpolation filter is applied to
the outgoing data; otherwise, either an interpolation or a sample-and-hold filter can be applied to the path.
6.16 DAC Control 2 (Address 13h)
6.16.1 DAC5 Noise Gate
This sets the bit depth at which the Noise Gate feature should engage for the DAC5 path.
6.16.2 Inv. DACx
Inverts the polarity of the DACx signal.
When the DAC5 path is put into TPS mode, the invert bit for the DAC5 path will be inoperable.
6.17 DAC Control 3 (Address 14h)
6.17.1 DAC5 Attenuation
Sets the mode of attenuation used for the DAC5 path.
Note: See Section 4.6.6 Volume Control for details regarding the attenuation modes.
DAC5 FLTR Filter Selected is:
00 Interpolation Filter
01 Sample and Hold
10 Tracking Power Supply Mode (See Section 4.6.5.1 for details)
11 Reserved
7 6 5 4 3 2 1 0
DAC5 NG[2:0] INV. DAC5 INV. DAC4 INV. DAC3 INV. DAC2 INV. DAC1
DAC5 NG Noise Gate is set at: [b]
000 Upper 13 Bits (72 dB)
001 Upper 14 Bits (78 dB)
010 Upper 15 Bits (84 dB)
011 Upper 16 Bits (90 dB)
100 Upper 17 Bits (96 dB)
101 Upper 18 Bits (102 dB)
110 Upper 24 Bits (138 dB)
111 Noise Gate Disabled
INV. DACx DACx Polarity is:
0 Not Inverted
1 Inverted
7 6 5 4 3 2 1 0
DAC5 ATT DAC1-4 ATT MUTE LL MUTE DAC5 MUTE DAC4 MUTE DAC3 MUTE DAC2 MUTE DAC1
DAC5 ATT Attenuation events happen:
0 On a soft ramp
1 Immediately