AK2346B Datasheet, PDF (14/31 Pages) Asahi Kasei Microsystems – Two-way Radio Audio Processor

ASAHI KASEI
[AK2346B]
1) TX audio system : TXRX=0
12. Level Diagram
f=1kHz
TXINO
TXIN
dBx
10
0
-10
-20
-30
-40
-50
-60
TXA1
G = 30dB
VR1
0 ^+-64..50dB
Compressor
Crosspoint
-10dBx
Pre-emphasis
0dB
Scrm
/Descrm
0dB
0
-5.5
-5
-10
-10
-16
-27
-30
-44
-50
-70
-80
-90
EXTLMIN
TXHPF
MSK
Modulator
Limitter
0dB
-7.6dBx
Splatter
+VR2
0
+3.0
-9.2
dB
SMF
0dB
MOD
-7.0
-10dBx (Audio)
-11
-19.2
-11dBx (MSK)
-27dBx
-30dBx
2) RX audio system : TXRX=1
f=1kHz
RXINO
RXIN
RXA1
VR3
G = 20dB
0 ^+-43..50dB
RXLPFO
RXLPF
0dB
dBx
10
0
-5
-6.5
-10
-10
-14
-20
-25
-25
-30
-30
-40
-45
-50
-60
RXHPF
+5dB
De-emphasis
-5dB
Scrm
/Descrm
-5dB
Expander
Crosspoint
-10dBx
EXPOUT
VR4
RXA2
0-+184..05 dB
G = 0dB
RXAF
0
0dBx (Max.)
-5
-10
-5.5
-10dBx (Typ.)
-20
-25
-28
-40
-40dBx
-50dBx
-50
“dBx” is standardized unit for 1.9V to 5.5V operation, 0dBx=-5+20log(VDD/2)dBm, 0dBm=0.775Vrms.
MS1409-E-00
- 14 -
2012/05