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CS4294 数据表(PDF) 32 Page - Cirrus Logic

部件名 CS4294
功能描述  SoundFusion Audio/Docking Codec 97 (AMC 97)
PDF  42 Pages
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制造商  CIRRUS [Cirrus Logic]
网页  http://www.cirrus.com
标志 CIRRUS - Cirrus Logic

CS4294 数据表(HTML) 32 Page - Cirrus Logic

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CS4294
32
DS326PP4
7.5
Power Supplies
The power supplies providing analog power should
be as clean as possible to minimize coupling into
the analog section which could degrade analog per-
formance. The pins AVdd1 and AVdd2 supply
power to all the analog circuitry on the CS4294.
This 5 Volt analog supply should be generated
from a voltage regulator (7805 type) connected to a
+12 Volt supply. This helps isolate the analog cir-
cuitry from noise typically found on +5 V digital
supplies which power many digital circuits in a PC
environment. A typical voltage regulator circuit for
analog power using an MC78M05CDT is shown in
Figure 14.
The digital power pins DVdd1 and DVdd2 should
be connected to the same digital supply as the AC
’97 Controller’s AC-Link interface. Since the digi-
tal interface on the CS4294 may operate at either
3.3 V or 5 V, proper connection of these pins will
depend on the digital power supply of the AC ’97
Controller. connections (vias). The AC-Link digi-
tal interface connection traces should be routed
such that digital ground plane lies underneath these
signals (on the internal ground layer) from the AC
’97 Controller continuously to the CS4294.
Figure 13. Headphones Driver
AGND
AGND
AGND
1/4 WATT
1/4 WATT
HP_OUT_R
ALT_LINE_OUT_L
HP_OUT_L
Vrefout
ALT_LINE_OUT_R
22pF
NPO
39k
Ω
4
1
2
3
22pF
NPO
TDA1308
+
-
5
6
7
27k
Ω
4
1
2
3
TDA1308
+
-
3
2
1
220
µF
ELEC
+
47K
Ω
4
1 2
3
ELEC
+
680pF
NPO
680pF
NPO
0.1
µF
Y5V
1.0
µF
Y5V
220
µF
10
Ω
10
Ω
+12VD
AGND
DGND
+5VA
0.1µF
Y5V
10µF
ELEC
+
10µF
ELEC
+
MC78M05CDT
OUT
3
GND
2
IN
1
0.1µF
Y5V
Figure 14. Voltage Regulator



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