ad1886ajstz-reel Analog Devices, Inc., ad1886ajstz-reel Datasheet - Page 24

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

AD1886A
The first option consists of an optical link using a TOSLINK fiber-optic transmitting module. A typical offering is the
TOSHIBA TOTX173 module for PCB mounted applications. This module can drive fiber optic cables up to 10 meters long, de-
pending on the cable hardware used. This solution offers compatibility with state of the art audio systems and provides excellent
common-mode rejection and noise immunity. R1 sets the current level for the internal LED and R2 allows the SPDIF transmitter to
be enabled at power-up. Note that the TOSLINK module requires V
The second method uses an electrical connection matching the requirements of the IEC958 “Digital Audio Interface” for consumer
products. This method uses a 75 Ω coax cable as the connecting medium, with RCA type connectors at both ends. The transmission
distance is at least 10 to 15 meters depending on the hardware used. The nominal electrical levels are 0.5 V p-p with a required bandwidth
of 7 MHz. The 1:1 ratio transformer is used for galvanic isolation and for improved common-mode noise rejection. R1 and R2 provide
the proper signal amplitude and impedance matching. R3 allows the SPDIF transmitter to be enabled at power-up.
JACK SENSE OPERATION
The AD1886A features a Jack Sense pin (JS) that can be used with the HP_OUT or LINE_OUT jacks to automatically mute the
other audio outputs. When the Jack Sense pin is connected to one of the output jacks, the AD1886A can sense whether an audio
plug has been inserted into the jack and automatically mute the LINE_OUT or MONO_OUT or both outputs.
The JS pin should normally be connected to the HP_OUT jack to automatically mute the MONO_OUT and LINE_OUT audio
signals, alternatively the JS pin can be connected to the LINE_OUT jack to automatically mute the MONO_OUT signal. The action
of the JS pin can be programmed by setting the JSLM and JSMM bits in the Jack Sense Register (72h). The following table summa-
rizes the Jack Sense operation:
The Jack Sense functionality is enabled by default on codec power-up (JSD bit = 0), however the JSLM and JSMM bits are set to
zero, therefore the muting action is not enabled for both outputs. The JSLM and JSMM bits have to be configured by the software
or INF configuration file for the desired muting action.
The Jack Sense pin is active high and contains an active internal pull-up. If the Jack Sense input is not going to be used, it should be
pulled down to digital ground using 10 kΩ resistors.
JSLM Bit
(Reg 72h, D9 Bit)
1
1
0
0
JSMM Bit
(Reg 72h, D5 Bit)
1
0
1
0
Table I. Jack Sense Operation Table
JS State = HIGH
(PLUG INSERTED)
LINE_OUT = ON
MONO_OUT = ON
LINE_OUT = ON
MONO_OUT = MUTE
LINE_OUT = MUTE
MONO_OUT = ON
LINE_OUT = MUTE
MONO_OUT = MUTE
CC
= 5 V (PC logic supply).
JS State = LOW
(PLUG REMOVED)
LINE_OUT = ON
MONO_OUT = ON
LINE_OUT = ON
MONO_OUT = ON
LINE_OUT = ON
MONO_OUT = ON
LINE_OUT = ON
MONO_OUT = ON