AK2346A Datasheet, PDF (16/37 Pages) Asahi Kasei Microsystems – Two-way Radio Audio Processor

ASAHI KASEI
[AK2346A]
1) TX audio system : TXRX=0
14. Level Diagram
f=1kHz
TXINO
TXIN
dBx
10
0
-10
-20
-30
-40
-50
-60
TXA1
G = 30dB
VR1
0 ^+-41.58dB
Compressor
Crosspoint
-10dBx
Pre-emphasi s
0dB
Scrm
/Descrm
0dB
0
-5.5
-5
-10
-10
-27
-18
-30
-44
-50
-70
-80
-90
EXTIN2
MSK
Modulator
TXHPF
0dB
Limitter
-7.6dBx
Splatter
+VR2
SMF
MOD
+3.0
0 _-9.2
dB
0dB
-7.0
-10dBx (Audio)
-11
-19.2
-11dBx (MSK)
-27dBx
-30dBx
2) RX audio system : TXRX=1
f=1kHz
RXINO
R XIN
RXA1
VR3
G = 20dB
0
+3.5
- 4.0
dB
RXLPF
0dB
dBx
10
0
-5
-10
-10
-20
-25
-25
-30
-30
-40
-45
-50
-60
-6.5
-14
FI LTER O
RXHPF
+5dB
De-emphasis
-5 dB
Scrm
/ Des crm
-5 dB
Expander
Cro sspoint
-10dBx
VR 4
+4.5
0-18.0
dB
SMF
G = 0dB
RXOUT
0
0dBx (Max.)
-5
-10
-5.5
-10dBx (Typ.)
-20
-25
-28
-40
-40dBx
-50dBx
-50
“dBx” is standardized unit for 2.6V to 5.5V operation, 0dBx=-5+20log(VDD/2)dBm, 0dBm=0.775Vrms.
MS1289-E-02
- 16 -
2012/06