ASAHI KASEI
[AK2346B]
12. Level Diagram
1) TX audio system : TXRX=0
MSK
Modulator
f=1kHz
TXINO
EXTLMIN
Splatter
+VR2
Compressor
Pre-emphasis
TXA1
VR1
+4.5
TXHPF
0dB
Limitter
-7.6dBx
SMF
0dB
TXIN
MOD
0dB
+3.0
Crosspoint
-10dBx
G = 30dB
dB
dB
0
0
-9.2
-6.0
Scrm
/Descrm
0dB
dBx
10
0
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-5
-7.0
-5.5
-10dBx (Audio)
-11dBx (MSK)
-10
-11
-10
-19.2
-16
-27
-30
-27dBx
-30dBx
-44
-50
2) RX audio system : TXRX=1
f=1kHz
RXLPFO
EXPOUT
RXINO
De-emphasis
RXA2
G = 0dB
VR4
+4.5
RXAF
VR3
+3.5
RXA1
RXLPF
0dB
Expander
RXHPF
+5dB
RXIN
-5dB
Scrm
dB
G = 20dB
dB
0
Crosspoint
-10dBx
0
-4.0
-18.0
/Descrm
-5dB
dBx
10
0
0
-6.5
-14
0dBx (Max.)
-5
-5.5
-10
-5
-10
-10dBx (Typ.)
-10
-25
-20
-20
-25
-30
-28
-25
-30
-40
-40
-45
-50
-40dBx
-50dBx
-50
-60
“dBx” is standardized unit for 1.9V to 5.5V operation, 0dBx=-5+20log(VDD/2)dBm, 0dBm=0.775Vrms.
MS1409-E-00 2012/05
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AKM [ ASAHI KASEI MICROSYSTEMS ]
