Graphics ClientM User Manual
110120-1000A
52
Audio Interface
A Cirrus Logic CS4202 AC ’97 codec with a National Semiconductor LM4863 dual audio
amplifier provides the audio interface on the GCM. This audio interface supports stereo
headphones and an audio line in on stereo jack
. For a description of the audio interface, see
Symbol
Parameter
Min
Typ.
Max
Units
D
VDD
Digital supply voltage (note 25)
3.3
V
A
VDD
Analog supply voltage (note 25)
5.0
V
f
OUT
Sample rate, output
48
kHz
f
IN
Sample rate, input (note 26)
8
44.1
kHz
Audio Line In (note 27)
V
IN
Full scale input voltage
1
V
rms
f
O
Low-pass cutoff
16
kHz
R
IN
Input impedance
10
k
Ω
C
IN
DC blocking capacitor
1
µ
F
Stereo Headphones (note 27)
V
OUT
Full scale output voltage
1.4
V
rms
R
L
External load impedance
32
Ω
C
OUT
DC blocking capacitor (note 28)
330
µ
F
R
PD
Pull-down resistance
1
k
Ω
Stereo Speakers (note 29)
R
L
Speaker load
4
8
Ω
P
OUT
Output power
THD+N = 1%, R
L
= 4
Ω
1.0
2.2
W
THD+N = 10%, R
L
= 4
Ω
1.0
2.7
W
THD+N = 1%, R
L
= 32
Ω
1.0
0.34
W
Notes:
25. The PXA270 enables power to the audio subsystem.
26. The output sample rate is fixed, but the input sample rate can be set to 8, 11.025, 22.05,
or 44.1 kHz.
27. Specifications are taken from the Cirrus Logic CS4202 Product Datasheet, DS549PP2
July ’05.
28. The GCM uses capacitors rated for at least 6.3V.
29. Specifications are taken from the National Semiconductor LM4863 Product Datasheet,
DS012881, October 2006.
Summary of Contents for PXA320
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