STAC9750 Datasheet, PDF (64/73 Pages) Integrated Device Technology – VALUE-LINE TWO-CHANNEL AC’97 CODECS

STAC9750/9751
VALUE-LINE TWO-CHANNEL AC’97 CODECS
PC AUDIO
10.3. Filter/References/GPIO
These signals are connected to resistors, capacitors, specific voltages, or provide General Purpose
I/O.
Table 45. Filtering and Voltage References
Signal Name Pin Number Type
Description
VREF
27
O Analog ground (0.45 * Vdd, at 5 V; 0.41 * Vdd at 3 V)
VREFOUT
28
O Reference Voltage out 5 mA drive (intended for MIC bias) (~Vdd/2)
AFILT1
29
O Anti-Aliasing Filter Cap - ADC left channel
AFILT2
30
O Anti-Aliasing Filter Cap - ADC right channel
CAP2
32
O ADC reference Cap
10.4. Power and Ground Signals
Pin Name
AVdd1
AVdd2
AVss1
AVss2
DVdd1
DVdd2
DVss1
DVss2
Pin #
25
38
26
42
1
9
4
7
Table 46. Power and Ground Signals
Type
Description
I Analog Vdd = 5.0 V or 3.3 V
I Analog Vdd = 5.0 V or 3.3 V (headphone power source)
I Analog Gnd
I Analog Gnd
I Digital Vdd = 3.3 V
I Digital Vdd = 3.3 V
I Digital Gnd
I Digital Gnd
IDT™
VALUE-LINE TWO-CHANNEL AC’97 CODECS
64
STAC9750/9751
V 5.8 103106