AK2346A Datasheet, PDF (11/37 Pages) Asahi Kasei Microsystems – Two-way Radio Audio Processor

ASAHI KASEI
[AK2346A]
13. Analog Characteristics
For the following conditions unless otherwise specified: f=1kHz, Emphasis: on, Compandor: on,
Scrambler: off, VR1=VR2=VR3=VR4=0dB with the external circuit shown in example page.33 to 35.
“dBx” is standardized unit for 2.6V to 5.5V operation, 0dBx=-5+20log(VDD/2)dBm, 0dBm=0.775Vrms.
1) TX Audio System
Parameter
Standard Input Level
Absolute Gain
Limit Level
Compressor
Linearity
Compressor
Distortion
Noise Level with no
signal input
VR1
Attenuation Error
VR2 ATT Error
(VR24,23,22,21,20)
VR2 ATT Error
(VR25=0)
Limiter DAC Error
(VR25=0)
Condition
@TXINO
TXINO to MOD
EXTLIMIN to MOD
TXINO to MOD
TXINO=-44dBx
TXINO=-50dBx
Relative value to 0dB for MOD
level of -10dBx TXINO.
TXINO to MOD
TXINO=-10dBx
30kHz Low-pass filtering
TXINO to MOD
C-Message filtering
TXINO to MOD
-18.0 dB to 4.5dB, 1.5dB/step
TXINO to MOD
-3.2dB to +3.0dB, 0.2dB/step
TXINO to MOD
When -6.4dB setting
Relative error for -6.4/0dB
MOD
-10～+5.5dB, 0.5dB/step
Min.
-1.5
-8.6
-20.0
-24.0
-1.5
-0.2
-6.8
-0.5
Typ.
-10
0
-7.6
-17.0
-20.0
-6.4
Max.
+1.5
-6.6
-14.0
-16.0
-35
-36.5
+1.5
+0.2
-6.0
+0.5
Units
dBx
dB
dBx
Notes
dB
dB
dBm
dB
dB
dB
dB
2) RX Audio System
Parameter
Condition
Standard Input Level @RXINO
Absolute Gain
RXINO to FILTERO
RXINO to RXOUT
Expander
Linearity
Expander
Distortion
Noise Level with no
signal input
VR3
Attenuation Error
VR4
Attenuation Error
VR4 ATT Error
(VR42,41,40=0,0,0)
RXINO to RXOUT
RXINO=-25dBx
RXINO=-30dBx
Relative value to 0dB for RXOUT
level of -10dBx RXINO
RXINO to RXOUT
RXINO=-5dBx
30kHz Low-pass filtering
RXINO to RXOUT
C-Message Filtering
RXIN0 to RXOUT
-4.0dB to +3.5dB, 0.5dB/step
RXIN0 to RXOUT
-4.5 to +4.5dB, 0.25dB/step
RXIN0 to RXOUT
When -18dB setting
Relative error for -18/0dB
MS1289-E-02
- 11 -
Min.
-1.5
-1.5
-33.0
-45.0
-0.5
-0.25
-20
Typ.
-10
0
0
-30.0
-40.0
-18
Max.
+1.5
+1.5
-27.0
-35.0
-35
-70
+0.5
+0.25
-16
Units
dBx
dB
dB
Notes
dB
dB
dBm
dB
dB
dB
2012/06