CS4245 Datasheet, PDF (45/54 Pages) Cirrus Logic – 105 dB, 24-Bit, 192 kHz Streo Sudio CODEC

CS4245
Table 14. 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 (Bits 2:0)
Function:
These bits are used to select the input source for the PGA and ADC. Please see Table 15 below.
Sel2
0
0
0
0
1
1
1
1
Table 15. Analog Input Multiplexer Selection
Sel1
0
0
1
1
0
0
1
1
Sel0
0
1
0
1
0
1
0
1
PGA/ADC Input
Microphone Level Inputs (+32 dB Gain Enabled)
Line Level Input Pair 1
Line Level Input Pair 2
Line Level Input Pair 3
Line Level Input Pair 4
Line Level Input Pair 5
Line Level Input Pair 6
Reserved
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 16. 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 16. 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
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