CS43L21 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'CS43L21' PDF : 63 Pages View PDF
CS43L21
4.3 Analog Outputs
AOUTA and AOUTB are the ground-centered line or headphone outputs. Various signal processing options
are available, including an internal Beep Generator. The desired path to the DAC must be selected using
the DATA_SEL[1:0] bits.
Software
Controls:
“DAC Control (Address 09h)” on page 42.
SIGNAL PROCESSING ENGINE (SPE)
MUTE_PCMMIXA
MUTE_PCMMIXB
PCMMIXA_VOL[6:0]
DEEMPH PCMMIXB_VOL[6:0]
+12dB/-51.5dB
0.5dB steps
Demph
VOL
OUTA_VOL[7:0]
OUTB_VOL[7:0]
+12dB/-102dB
0.5dB steps
Chnl Vol.
Settings
PCMA[1:0]
PCMB[1:0]
Channel
Swap
BPVOL[4:0]
0dB/-50dB
2.0dB steps
VOL
Σ
VOL
DAC_SZC[1:0]
DACA_MUTE
DACB_MUTE
INV_DACA
INV_DACB
DAC_SNGVOL
AMUTE
ARATE[7:0]
RRATE[7:0]
MAX[2:0]
MIN[2:0]
LIM_SRDIS
LIM_ZCDIS
LIMIT_EN
Limiter
TC_EN
Peak
Detect
Bass/
Treble/
Control
BASS_CF[1:0]
TREB_CF[1:0]
BASS[3:0]
TREB[3:0]
+12.0dB/-10.5dB
1.5dB steps
DATA_SEL[1:0]
PDN_DACA
PDN_DACB
HP_GAIN[2:0]
Switched
Headphone
01
Capacitor DAC
Amp - GND
Left/Right
and Filter
Centered
HP Out
00
Charge
Pump
CHRG_FREQ[3:0]
OFFTIME[2:0]
ONTIME[3:0]
FREQ[3:0]
REPEAT
BEEP
Beep
Generator
Figure 8. Output Architecture
4.3.1
De-Emphasis Filter
The CODEC includes on-chip digital de-emphasis optimized for a sample rate of 44.1 kHz. The filter re-
sponse is shown in Figure 9. The de-emphasis feature is included to accommodate audio recordings that
utilize 50/15 µs pre-emphasis equalization as a means of noise reduction. De-emphasis is only available
in Single-Speed Mode.
Software
Controls:
Hardware
Control:
“DAC Control (Address 09h)” on page 42.
Pin
Setting
“DEM” pin 4. LO
HI
Selection
No De-Emphasis
De-Emphasis Applied
24
DS723A1
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