STAC9721 Datasheet, PDF (9/48 Pages) List of Unclassifed Manufacturers – Stereo AC 97 Codec With Multi-Codec Option

SigmaTel, Inc.
Data Sheet
STAC9721
1.3 Filter/References/GPIO
These signals are connected to resistors, capacitors, specific voltages, or provide general purpose I/O.
Table 5. Filtering and Voltage References
Signal Name Type
Description
Vref
Vrefout
AFILT1
AFILT2
CAP1
CAP2
CAP3
APOP
EAPD
O
Reference Voltage
O Reference Voltage out 5mA drive (intended for mic
bias)
O
Anti-Aliasing Filter Cap - ADC channel
O
Anti-Aliasing Filter Cap - ADC channel
O
Analog Output Hold-Off Delay
O
ADC reference Cap
O
Anti-Pop Power Sustain Delay
O
Anti-Pop Output Ground Shunt Control
O
External Amplifier Power Down Control
1.4 Power and Ground Signals
Table 6. Power Signal List STAC9721/23
Signal Name
AVdd1
AVdd2
AVss1
AVss2
DVdd1
DVdd2
DVss1
DVss2
Type
STAC9721
I
Analog Vdd = 5.0V
I
Analog Vdd = 5.0V
I
Analog Gnd
I
Analog Gnd
I Digital Vdd = 5.0V or 3.3V
I Digital Vdd = 5.0V or 3.3V
I
Digital Gnd
I
Digital Gnd
STAC9723
Analog Vdd = 3.3V
Analog Vdd = 3.3V
Analog Gnd
Analog Gnd
Digital Vdd = 3.3V
Digital Vdd = 3.3V
Digital Gnd
Digital Gnd
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04/07/00
04/07/00