AK2347B Datasheet, PDF (15/34 Pages) Asahi Kasei Microsystems – Two-way Radio Audio & Sub-Audio Processor

ASAHI KASEI
[AK2347B]
1) TX system: TXRX=0
13. Level Diagram
f=1kHz
TXINO
EXTIN
TXIN
dBx
10
0
-10
-20
-30
-40
-50
-60
TXA1
G = 30dB
VR1
0
+4.5
-6.0
dB
Compressor
Crosspoint
-10dBx
Pre-emphasis
0dB
Scrm
/Descrm
0dB
0
-5.5
-5
-10
-10
-16
-27
-30
-44
-50
-70
-80
-90
TXA2
TXHPF
0dB
Limiter
-7.6dBx
Splatter
+VR2
0
+3.0
-9.6
dB
SMF
0dB
MOD
-7.0
-10dBx (Audio)
-10
-19.2
-27dBx
-30dBx
2) RX system: TXRX=1
f=1kHz
RXINO
RXIN
RXA1
VR3
G = 20dB
0
+3.5
-4.0
dB
FILTERO
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
VR4
0-+184..05 dB
SMF
G = 0dB
RXOUT
0
0dBx (Max.)
-5
-10
-5.5
-10dBx (Typ.)
-20
-25
-28
-40
-40dBx
-50dBx
-50
Note) dBx is a standardized notation to match the operating voltage and is defined by equation
0dBx = -5 + 20log(VDD/2)dBm.
MS1419-E-00
- 15 -
2012/05