AK2347B Datasheet, PDF (19/34 Pages) Asahi Kasei Microsystems – Two-way Radio Audio & Sub-Audio Processor

ASAHI KASEI
[AK2347B]
2) Descriptions of registers
2.1) Control register 1
Address
A3
A2
A1
A0
0
0
0
0
When power-down
Data
D7
D6
D5
D4
D3
D2
D1
D0
BS3 BS2 BS1 TXRX TXSW2 TXSW1 RXSW MCKSL
0
0
0
1
1
1
1
1
2.1.1) Operation mode setting
BS3
BS2
BS1
Mode name
0
0
0
Mode 0
(Power-down)
0
0
1
Mode 1
(standby)
0
1
0
Mode 2
0
1
1
Mode 3
1
0/1
0/1
Mode 4
OSC and AGND
system
OFF
ON
ON
ON
ON
TX and RX audio
system
OFF
OFF
ON
OFF
ON
Sub-Audio
system
OFF
OFF
OFF
ON
ON
2.1.2) TX and RX setting
Data
Item
TXRX
RXSW
MCKSL
TX-RX switch
RX audio mute
Master clock
frequency
0
TX operation
*1)
Mute
3.579545MHz
Function
1
RX operation
*2)
Normal operation
3.6864MHz
Remarks
*3)
*4)
2.1.3) TX path setting
TXSW2 TXSW1
Function
1
1
Mute
(AGND → Limiter → Splatter)
Audio system operation
0
1
(HPF → Limiter→ Splatter)
External signal operation
1
0
(EXTIN pin → Limiter → Splatter)
0
0
Audio signal and external signal added together
(HPF+EXTIN pin → Adder → Limiter → Splatter)
Remarks
*1) When TXRX is set to 0 and RXSW is set to 1, the signal input from the TXIN pin can be output to
the RXOUT pin. In this case, because use of the Scrambler/Descrambler is inhibited, be sure to
set PCONT to 1.
When RXSW is set to 0, the RXOUT pin output is muted.
*2) When TXRX is set to 1 and TXSW2 and TXSW1 are set to 0 and 1 respectively, the signal input
from the RXIN pin can be output to the MOD pin. In this case, because use of the
Scrambler/Descrambler is inhibited, be sure to set PCONT to 1. When TXSW2 and TXSW1 are
set to 1 and 1 respectively, the MOD pin output is muted.
*3) Set the gain level for each circuit block properly according to the level diagrams on page 15.
*4) If RXSW is set to 0, the FILTERO pin output is not muted.
MS1419-E-00
- 19 -
2012/05