AK2308LV_05 Datasheet, PDF (13/31 Pages) Asahi Kasei Microsystems – SPEECH CODEC for Digital Key telephone

ASAHI KASEI
[AK2308LV]
3. Path and Gain Controls
The voice path gain of both RX and TX side, and the tone path gain are controlled from the CPU registers.
3-1. Voice Path control switches;
AK2308LV has 7 analog switches to control the RX, TX analog path and Tone path. These switches are
controlled from following “Path Control” register.
Path Control
Register Type : Read Write[Address:0000 D6-D0:(SW7-SW1)]
ADD
D7
D6
D5
D4
D3
D2
0
-
SW7 SW6 SW5 SW4 SW3
Default 0
0
0
0
0
0
D1
SW2
0
D0
SW1
0
Table3-a Switch function
SW Name
Function
SW7
Speaker Tone enable 2
SW6
Handset Tone select
SW5
Speaker Tone enable 1
SW4
RX Voice path enable for Handset
SW3
RX speaker path enable
SW2
SW1
TX MIC path enable
TX Handset path enable
Polarity
1: Tone output ON 0: Tone output OFF
1: Tone output ON 0: Tone output OFF
1: Tone output ON 0: Tone output OFF
1: Voice path ON 0: Voice path OFF
1: Speaker path ON
0: Speaker path OFF
1: MIC path ON 0: MIC path OFF
1: Handset path ON 0: Handset path OFF
Tone Path
When the tone signal is applied, please input the tone signal first, and then turn on the switches (SW7~5).
Also when you want to stop the tone signal, please turn off the switches before stopping the tone signal. This
is to prevent the pop noise when tone is turned off & on.
TONEI
SW5
Vol 1
SW7
-1
-11dB
SPOP
SPON
SW6
-25dB
HANDR
Notice
Please do not turn on the SW5 and SW7 simultaneously.
MS0227-E-01
13
2005/12