STAC9752A Datasheet, PDF (81/106 Pages) Integrated Device Technology – AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK

STAC9752A/9753A
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
PC AUDIO
Bit(s) Reset Value
Name
Description
5:4
0
ADCSLT1:0
Select slots for ADC data on ACLINK
00 = left slot 3, right slot 4
01 = left slot 7, right slot 8
10 = left slot 6, right slot 9
11 = left slot 10, right slot 11
3
0
Reserved Reserved
Adds +10dB gain to the selected MIC input. Use in conjunction with
BOOSTEN (Reg. 0Eh;D6)
BOOSTEN MICGAINVAL
2
0
MIC GAIN VAL 0
0
= 0 dB
0
1
= 10 dB
1
0
= 20 dB
1
1
= 30 dB
Supply Override bit allows override of the supply detect.
1
0
SPLYOVR_EN _{0 = no override on supply detect}
1 = override supply detect with bit 0
Supply Override Value provides the analog voltage operation values.
0
0
SPLYOVR_VA
L
0 = force 3.3 V operation
1 = force 5 V operation
7.4.10.
Analog Current Adjust (72h)
To unlock Register 72h, write 0xABBA to Register 70h.
Default: 0000h
D15
D14
D13
D12
D11
D10
D9
D8
Reserved
D7
D6
D5
D4
D3
D2
D1
D0
INT APOP
Reserved
Bit(s) Reset Value
15:8
0
7
0
6:0
0
Name
Reserved
INT_APOP
Reserved
Description
Reserved
0 = Anti Pop Enabled
1 = Anti Pop Disabled
The STAC9752A/9753A includes an internal power supply anti-pop circuit that
prevents audible clicks and pops from being heard when the CODEC is powered
on and off. This function is accomplished by delaying the charge/discharge of the
VREF capacitor (Pin 27). C_VREF value of 1 µF will cause a turn-on delay of
roughly 3 seconds, which will allow the power supplies to stabilize before the
CODEC outputs are enabled. The delay will be extended to 30 seconds if a value
of C_VREF value of 10 µF is used. The CODEC outputs are also kept stable for the
same amount of time at power-off to allow the system to be gracefully turned off.
The INT_APOP bit allows this delay circuit to be bypassed for rapid production
testing. Any external component anti-pop circuit is unaffected by the internal
circuit.
Reserved
IDT™
81
AC’97 2.3 CODECS WITH STEREO MICROPHONE & UNIVERSAL JACK
STAC9752A/9753A
V 1.5 1206