CS4265 Datasheet, PDF (38/53 Pages) Cirrus Logic – 105 dB, 24-Bit, 192 kHz Stereo Audio CODEC

CS4265
Table 12. PGA Soft Cross or Zero Cross Mode Selection
6.9.2
PGASoft
PGAZeroCross
Mode
0
0
Changes to affect immediately
0
1
Zero Cross enabled
1
0
Soft Ramp enabled
1
1
Soft Ramp and Zero Cross enabled (default)
Analog Input Selection (Bit 0)
Function:
These bits are used to select the input source for the PGA and ADC. Please see Table 13 below.
Table 13. Analog Input Selection
Select
0
1
PGA/ADC Input
Microphone Level Input
Line Level Input
6.10 DAC Channel A Volume Control - Address 0Ah
See 6.11 DAC Channel B Volume Control - Address 0Bh
6.11 DAC Channel B Volume Control - Address 0Bh
7
6
5
4
3
2
1
0
Vol7
Vol6
Vol5
Vol4
Vol3
Vol2
Vol1
Vol0
6.11.1 Volume Control (Bits 7:0)
Function:
The digital volume control allows the user to attenuate the signal in 0.5 dB increments from 0 to
-127 dB. The Vol0 bit activates a 0.5 dB attenuation when set, and no attenuation when cleared. The
Vol[7:1] bits activate attenuation equal to their decimal equivalent (in dB). Example volume settings
are decoded as shown in Table Table 14. The volume changes are implemented as dictated by the
DACSoft and DACZeroCross bits in the DAC Control 2 register (see section 6.12.1).
Table 14. Digital Volume Control Example Settings
Binary Code
00000000
00000001
00101000
00101001
11111110
11111111
Volume Setting
0 dB
-0.5 dB
-20 dB
-20.5 dB
-127 dB
-127.5 dB
6.12 DAC Control 2 - Address 0Ch
7
DACSoft
6
DACZero
5
InvertDAC
4
Reserved
3
Reserved
2
Reserved
1
Reserved
0
Reserved
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DS657A2