EN 129
3139 785 32804
8.
IC Internal Block Diagrams
8.1 Analog Board
IC7202 - CS4344 – Digital To Analogue Converter
BLOCK DIAGRAM
PCM
Serial
Interface
Multibit
∆Σ
Modulator
Interpolation
Filter
Internal
Voltage
Reference
Switched
Capacitor
DAC and
Filter
Serial Audio
Input
Right
Output
Left
Output
Switched
Capacitor
DAC and
Filter
De-emphasis
Multibit
∆Σ
Modulator
Interpolation
Filter
3.3 V or 5 V
Figure 8-1
PIN DESCRIPTION AND CONFIGURATION
Pin Name
#
Pin Description
SDIN
1
Serial Audio Data Input
(
Input
) - Input for two’s complement serial audio data.
DEM/SCLK
2
De-Emphasis/External Serial Clock Input
(
Input
) - used for de-emphasis filter control or external serial
clock input.
LRCK
3
Left Right Clock
(
Input
) - Determines which channel, Left or Right, is currently active on the serial audio
data line.
MCLK
4
Master Clock
(
Input
) - Clock source for the delta-sigma modulator and digital filters.
VQ
5
Quiescent Voltage
(
Output
) - Filter connection for internal quiescent voltage.
FILT+
6
Positive Voltage Reference
(
Output
)
-
Positive reference voltage for the internal sampling
circuits.
AOUTL
7
Left Channel Analog Output
(
Output
) - The full scale analog output level is specified in the Analog Char-
acteristics specification table.
GND
8
Ground
(
Input
) - ground reference.
VA
9
Analog Power
(
Input
)
-
Positive power for the analog and digital sections.
AOUTR
10
Right Channel Analog Output
(
Output
) - The full scale analog output level is specified in the Analog
Characteristics specification table.
SDIN
AOUTR
DEM/SCLK
VA
LRCK
GND
MCLK
AOUTL
VQ
FILT+
1
2
3
4
5
6
7
8
9
10
8. IC Internal Block Diagrams
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