CS4245 データシートの表示（PDF） - Cirrus Logic
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CS4245 Datasheet PDF : 57 Pages
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CS4245
occur after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sam-
ple rate) if the signal does not encounter a zero crossing. The zero cross function is independently mon-
itored and implemented for each channel. See Table 15.
6.9.2
PGASoft
0
0
1
1
PGAZeroCross
0
1
0
1
Mode
Changes to affect immediately
Zero Cross enabled
Soft Ramp enabled
Soft Ramp and Zero Cross enabled (default)
Table 15. PGA Soft Cross or Zero Cross Mode Selection
Analog Input Selection (Bits 2:0)
Function:
These bits are used to select the input source for the PGA and ADC. Please see Table 16.
Sel2
0
0
0
0
1
1
1
1
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
Table 16. Analog Input Multiplexer Selection
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
DS656F2
47
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