AK2346B Datasheet, PDF (9/31 Pages) Asahi Kasei Microsystems – Two-way Radio Audio Processor

ASAHI KASEI
[AK2346B]
11. 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.26 to 29.
“dBx” is standardized unit for 1.9V 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)
Condition
@TXINO
TXINO to MOD
EXTLIMIN to MOD
Without external R adjustment
With external R adjustment
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
-6.0 dB to 4.5dB, 1.5dB/step
TXINO to MOD
-3.2dB to +3.0dB, 0.2dB/step
TXINO to MOD
Relative error for -6/0dB
Min.
-1.5
-8.6
-20.0
-24.0
-1.5
-0.2
-6.4
Typ.
-10
0
-7.6
-17.0
-20.0
-6
Max.
+1.5
-6.6
-6.6
-14.0
-16.0
-35
-36.5
+1.5
+0.2
-5.6
Units
dBx
dB
Notes
dBx
dB
dB
dBm
dB
dB
dB
2) RX Audio System
Parameter
Condition
Standard Input Level @RXINO
Absolute Gain
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 RXLPFO
RXINO to RXAF
RXINO to RXAF
RXINO=-25dBx
RXINO=-30dBx
Relative value to 0dB for RXAF
level of -10dBx RXINO
RXINO to RXAF
RXINO=-5dBx
30kHz Low-pass filtering
RXINO to RXAF
C-Message Filtering
RXIN0 to RXAF
-4.0dB to +3.5dB, 0.5dB/step
RXIN0 to RXAF
-4.5 to +4.5dB, 1.5dB/step
RXIN0 to RXAF
Relative error for -18/0dB
Min. Typ. Max. Units Notes
-10
dBx
-1.5
0
+1.5
dB
-1.5
0
+1.5
dB
-33.0 -30.0 -27.0
-45.0 -40.0 -35.0
dB
-35
dB
-70 dBm
-0.5
+0.5
dB
-1.5
+1.5
dB
-20
-18
-16
dB
MS1409-E-00
-9-
2012/05