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
@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
Condition
Min.
-1.5
-8.6
Typ.
-10
0
-7.6
Max.
+1.5
-6.6
-6.6
-14.0
-16.0
Units
dBx
dB
dBx
Notes
Absolute Gain
Limit Level
Compressor
Linearity
-20.0
-24.0
-17.0
-20.0
dB
Compressor
Distortion
Noise Level with no
signal input
VR1
Attenuation Error
VR2 ATT Error
(VR24,23,22,21,20)
VR2 ATT Error
(VR25=0)
2) RX Audio System
Parameter
Standard Input Level
-35
-36.5
-1.5
-0.2
-6.4
-6
+1.5
+0.2
-5.6
dB
dBm
dB
dB
dB
Condition
@RXINO
RXINO to RXLPFO
RXINO to RXAF
Min.
-1.5
-1.5
-33.0
-45.0
Typ.
-10
0
0
-30.0
-40.0
Max.
+1.5
+1.5
-27.0
-35.0
Units
dBx
dB
dB
Notes
Absolute Gain
Expander
Linearity
RXINO to RXAF
RXINO=-25dBx
RXINO=-30dBx
Relative value to 0dB for RXAF
level of -10dBx RXINO
Expander
RXINO to RXAF
Distortion
RXINO=-5dBx
30kHz Low-pass filtering
Noise Level with no
RXINO to RXAF
signal input
C-Message Filtering
VR3
RXIN0 to RXAF
-4.0dB to +3.5dB, 0.5dB/step
Attenuation Error
VR4
RXIN0 to RXAF
-4.5 to +4.5dB, 1.5dB/step
Attenuation Error
VR4 ATT Error
RXIN0 to RXAF
(VR42,41,40=0,0,0)
Relative error for -18/0dB
dB
-35
-70
-0.5
-1.5
-20
-18
+0.5
+1.5
-16
dB
dBm
dB
dB
dB
MS1409-E-00
-9-
2012/05
AKM [ ASAHI KASEI MICROSYSTEMS ]
