ASAHI KASEI [AK2347]
MS0375-J-00 2005/01
- 1 -
AK2347
LSI
(3.388kHz, 3.290kHz)
CTCSSLPF
(3.6864MHz, 3.579545MHz)
2.7V3.3V
-40+85
CMOS
24VSOP
AK2347
CTCSSLPFIC
HPF250HzCTCSS
2.55kHz3.0kHz
CPU
(Top view)
AGNDIN
AGND
TXINO
TXIN
EXTIN
EXTINO
LIMLV
MOD
VSS
SDATA
SCLK
CSN
11
12
1
2
3
4
5
6
7
8
9
10
RXIN
RXINO
FILTERO
RXOUT
DINO
DIN
RSAOUT
TSAOUT
VDD
XOUT
XIN
TEST
24
23
22
21
20
19
18
17
16
15
14
13
ASAHI KASEI [AK2347]
MS0375-J-00 2005/01
- 2 -
.......................................................................................
.......................................................................................
..............................................................................
..............................................................................
..............................................................................
..............................................................................
..............................................................................
DC ...........................................................................
........................................................................
..............................................................................
..............................................................................
.....................................................................
AC .....................................................................
.....................................................................
.....................................................................
..............................................................................
...........................................................................
ASAHI KASEI [AK2347]
MS0375-J-00 2005/01
- 4 -
TXA1
SCF
30dB
10kHz
VR1
(HPF)
VR12
10
-6.0+4.5 1.5dB/step
Compressor
dB1/2
:-10dBx
TC
ON/OFF
Pre-emphasis S/N
TX/RX_HPF
250HzHigh-pass
HPF
ON/OFF
Scrambler/
Descrambler
3.388kHz3.290kHz
EM,PCONT
TXA2
0dB10kHz
Adder
TXSW2, 1
Limiter
LIMLV
DC
LMT
ON/OFF
VR2
MOD
VR25
20
-3.2+3.0 0.2dB/step -6.4/0dB
Splatter
MSK3kHz
Low-pass
SPL
SMF
SCFSmoothing
RXA1
SCF
20dB
40kHz
VR3
VR33
30
-4.0+3.5 0.5dB/step
RXLPF 3kHzLow-pass
De-emphasis Pre-emphasis
Expander
CompressordB2
-10dBx
TC
ON/OFF
VR4
VR45
40
-18.0,-4.5+4.5 0.25dB/step
DTA1
Sub-Audio LPF
0dB
10kHz
Sub-Audio
Programmable LPF
DTA1Low-pass
RXA1
SASW
SA5
SA0