STAC9752/9753
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING
IDT™
88 STAC9752/9753
REV 3.3 1206
TWO-CHANNEL, 20-BIT, AC’97 2.3 CODECS WITH HEADPHONE DRIVE, SPDIF OUTPUT MICROPHONE & JACK SENSING
12.3. Filter/References
These signals are connected to resistors, capacitors, or specific voltages.
12.4. Power and Ground Signals
Table 34. Filtering and Voltage References
Signal Name Pin Number Type Description
VREF 27 O Analog ground (0.45 * Vdd, at 5 V; or 0.41 * Vdd at 3 V)
VREFOUT 28 O
Reference Voltage out 5 mA drive (intended for microphone
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
Table 35. Power and Ground Signals
Pin Name Pin # Type Description
AVdd1 25 I Analog Vdd = 5.0 V or 3.3 V
AVdd2 38 I Analog Vdd = 5.0 V or 3.3 V
AVss1 26 I Analog Gnd
AVss2 42 I Analog Gnd
DVdd1 1 I Digital Vdd = 3.3 V
DVdd2 9 I Digital Vdd = 3.3 V
DVss1 4 I Digital Gnd
DVss2 7 I Digital Gnd
