ad1886ajstz-reel Analog Devices, Inc., ad1886ajstz-reel Datasheet - Page 27

• Manufacturer Part Number: ad1886ajstz-reel
• Description: Ac?97 Soundmax Codec
• Manufacturer: Analog Devices, Inc.

LINE OUTPUT CONNECTIONS
The AD1886A Codec provides stereo LINE_OUT signals at a standard 1 V rms level. These signals must be ac-coupled before they
can be connected to an external load. After the ac-coupling, a minimal resistive load is recommended to keep the capacitors properly
biased and reduce clicks and pops when plugging stereo equipment into the output jack. The capacitor values should be selected to
provide a desired frequency response, taking into account the nominal impedance of the external load. To meet the PC99 specifica-
tion for PCs, testing must be performed with a 10 kΩ load, therefore a minimum of 1 µF value is recommended to achieve less than
–3 dB roll-off at 20 Hz.
PC BEEP INPUT CONNECTIONS
The recommended PC BEEP input circuit is shown below. Under most cases the PC_BEEP signal should be attenuated, filtered and
then ac-coupled into the Codec.
J1
MIC INPUT
STEREO LINE_OUT JACK
1
2
3
4
5
J1
J1
MIC INPUT
L1 600Z
L2 600Z
COMPONENTS
PC_BEEP (FROM ICH)
EMC
1
2
3
4
5
C1
470pF
C2
470pF
L2 600Z
L1 600Z
L1 600Z
L2 600Z
COMPONENTS
EMC
AC-COUPLING
C2
470pF
MIC BIAS
0.22 F
2.2k
10k
C1
470pF
C3
R1
C1
470pF
R1
0.1 F
C2
470pF
C1
R1
47k
10k
R2
R2
1k
AC-COUPLING
0.1 F
MIC BIAS
PREAMP
C2
R2
47k
0.22 F
2.2k
C3
R1
100k
AVDD
U1
R3
AD8531
1 F
1 F
C4
TO CODEC PC_BEEP INPUT
C3
AC-COUPLING
TO CODEC MIC1 OR MIC2 INPUT
FROM CODEC V
0.22 F
C4
FROM CODEC LINE_OUT_R
FROM CODEC LINE_OUT_L
REFOUT
TO CODEC MIC1 OR MIC2 INPUT
FROM CODEC V
AD1886A
REFOUT