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| AMIS-49200 Datasheet, PDF (10/22 Pages) AMI SEMICONDUCTOR – Fieldbus MAU Chip | |||
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AMIS-49200 Fieldbus MAU
Data Sheet
Table 8: Tri-level Modulator
Parameter
Symbol
Tri-level Modulator and Slew Control
Output voltage
VO
Load current
IO
Output for silence 1
VS
Output for high level 1
Output for low level 1
Asymmetry of VH and VL
Rise and fall times 2
VH
VL
âVHL
tf, tr
Min.
VMID
-35
VMID+0.485
VS+0.380
VS-0.420
-0.02
Typ.
VMID+0.500
VS+0.400
VS-0.400
4.7
Max.
3.02
+120
VMID+0.515
VS+0.420
VS-0.380
0.02
Units
V
µA
V
V
V
V
µsec
Conditions
(Output is at
VDRV)
|âV| 10mV
TXE disabled
TXE active
TXE active
Note 2
(CRT=22pF)
Notes:
1.
2.
Nominal values are: VS = 2.5V, VH=2.9V and VL=2.1V.
By adding an external capacitor between the CRT pin and ground, slew rate at VDRV output can be controlled. The controlling equation is tf or tr =2us +
(0.123us/pF * CRT). CRT is nominally 22pF, yielding tf=tr=4.7us. The constant comes from an internal capacitor. The hot side of the capacitor and the CRT pin
should have a guard pattern around them to avoid unnecessary interference.
Table 9: Current Control Amplifier
Parameter
Current Control Amplifier
Input common mode voltage
range
Output voltage swing
Load current
Input offset voltage
Slew rate
Gain bandwidth product
Phase margin
Symbol
VCM
VO
Io
VOS
SR
GBW
PM
Min.
0
1
-2300
-3
Typ.
0.54
1.15
66
Max.
VCC â 1
VCC â 0.5
100
+3
Units
V
V
µA
mV
V/µs
MHz
Deg
Conditions
(Output is at CCOUT)
CL=10pf
RL=200k
AMI Semiconductor â Jan. 07, M-20532-003
10
www.amis.com
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