AT8xC51SND2C
DAC Features
• 20 bit D/A Conversion
• 72dB Dynamic Range, -75dB THD Stereo line-in or microphone interface with 20dB
amplification
• 93dB Dynamic Range, -80dB THD Stereo D/A conversion
• 74dB Dynamic Range / -65dB THD for 20mW output power over 32 Ohm loads
• Stereo, Mono and Reverse Stereo Mixer
• Left/Right speaker short-circuit detection flag
• Differential mono auxiliary input amplifier and PA driver
• Audio sampling rates (Fs): 16, 22.05, 24, 32, 44.1 and 48 kHz.
Figure 54. Stereo DAC functional diagram
PA Gain
MONOP
PADRV
+
MONON
AUXP
AUX
AUXN
AUXG Gain
LINEL
LINER
PGA
LLIG,RLIG Gain
20,12 to -33 dB
(3dB)
PGA
Line Out Gain
LLOG, RLOG
0 to -46.5dB
(1.5dB)
Master Playback
Gain
12 to -34dB (1.5dB)
DSEL
SCLK
SPKR
DRV
32
Volume
Control
Volume
Control
DAC
DAC
Digital Filter
Digital Filter
+
+
+
HSL
HSR
Serial to
Parallel
Interface
DAC_OLC Gain
6 to -6dB (3dB)
DCLK
DOUT
SPKR
DRV
32
Volume
Control
Volume
Control
+
Digital Signals Timing
Data Interface
To avoid noises at the output, the reset state is maintained until proper synchronism is
achieved in the DAC serial interface:
•
•
•
•
DSEL
SCLK
DCLK
DOUT
The data interface allows three different data transfer modes:
81
4341D–MP3–04/05
ATMEL [ ATMEL ]
