AK2346A Datasheet, PDF (3/37 Pages) Asahi Kasei Microsystems – Two-way Radio Audio Processor

ASAHI KASEI
[AK2346A]
4. Block Diagram
TXINO ²⁰
TXIN
19
-
+
TXA1
RXINO
11
10 _-
RXIN
+
RXA1
12
FILTERO
Adder
1
VR1
(HPF)
TC
EM
Com-
pressor
Pre-
Emphasis
-18 to +4.5/1.5dB
TXRX
fc = 300Hz
TX/RX
_HPF
16
17
-
+
TXA2
Scrambler/
Descrambler
VR3
RXLPF
TXRX HPFSW ^TXRX
PCONT
PCONT
PCONT
-4 to +3.5/0.5dB
FILSW 1,0
MSK
BPF
21
TXSW 2,1,0
Adder
2
DAC
LIMSW
Limiter
VR2
Splatter
22
SMF
De-
Emphasis
RXSW
EM
-9.6 to +3.0
/0.2dB
Expan-
der
fc = 2.55kHz
/3.0kHz
VR4
3
SMF
-18,-4.5 to +4.5
TC
/0.25dB
6
DIV
OSC ₅
MSK
Demodulator
MSK
Modulator
MSKSW 1,0
1
24
Control
Register
2 3 4 23
Power ON
Power ON Power ON Power ON
at Mode 1,2,3,4 at Mode 2,4 _{at Mode 3,4} at Mode 2,3,4
18
7
8
9
+
+
AGND
14
15
+
+
MOD
RXOUT
XIN
XOUT
MS1289-E-02
-3-
2012/06