AK2305 Datasheet, PDF (17/43 Pages) Asahi Kasei Microsystems – Dual PCM CODEC for ISDN TERMINAL ADAPTER

ASAHI KASEI
[AK2305]
MUTE
PIN CONTROL
The output on each channel can be muted independently by pin control.
MUTEn
(n=0,1)
0
1
Operation
Normal
Mute
DXn pin
(n=0,1)
PCM data output
High-Impedance
VRXn pin
(n=0,1)
CODEC
analog output
AGND*
Remarks
*)TONE circuits are
avialable even if the mute
operates.
REGISTER CONTROL
The output on each channel can be muted independently by register control.
MTDXn
(n=0,1)
Operation
DXn pin
(n=0,1)
VRXn pin
(n=0,1)
Remarks
0
Normal
PCM data output
CODEC
Reset
analog output*
1
Mute
High-Impedance ^{(MUTE0,1pin=”0”)}
*) MUTEn is given priority over MTDXn. Therefore, for instance, even when MTDXn is “1,” output of VRXn is
AGND if MUTEn=”1.”
<Example>
CH0 muted (MUTE0=”1,” MUTE1=”0,” MTDX0,1=”0” : GCI mode)
FS0
BCLK
DX0
DR0
Don’t care
B1-CHANNEL(CH0)
<SEL2B=”0”>
12345678
1
2
3
4
5
6
7
8
Don’t
care
B2-CHANNEL(CH1)
<SEL2B=”0”>
VRX0 : ^{CODEC CH0 analog output is always at AGND level.}
TONEGEN0,1output can be controlled by TNOE0,1 pin.
VRX1 : ^{CODEC CH1 analog output is the signal converted from the PCM data of CH1 input through DR0 pin.}
TONEGEN0,1 output can be controlled by TNOE0,1 pin.
C0029-E-02
17
1999/8