AMIS-49200 Fieldbus MAU
Data Sheet
Table 8: Tri-level Modulator
Parameter
Symbol
Min.
Typ.
Max.
Units
Tri-level Modulator and Slew Control
Output voltage
Load current
Output for silence
1
Conditions
(Output is at
VDRV)
|∆V| 10mV
TXE disabled
TXE active
TXE active
Note 2
(C
RT
=22pF)
V
O
I
O
V
S
1
V
MID
-35
V
MID
+0.485
V
S
+0.380
V
S
-0.420
-0.02
4.7
V
MID
+0.500
V
S
+0.400
V
S
-0.400
3.02
+120
V
MID
+0.515
V
S
+0.420
V
S
-0.380
0.02
V
µA
V
V
V
V
µsec
Output for high level
Output for low level
1
V
H
V
L
∆V
HL
tf, tr
Asymmetry of V
H
and V
L
Rise and fall times
Notes:
1.
2.
2
Nominal values are: V
S
= 2.5V, V
H
=2.9V and V
L
=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 * C
RT
). C
RT
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
V
CM
V
O
I
o
V
OS
SR
GBW
PM
Min.
0
1
-2300
-3
Typ.
Max.
V
CC
– 1
VCC – 0.5
100
+3
Units
V
V
µA
mV
V/µs
MHz
Deg
Conditions
(Output is at CCOUT)
0.54
1.15
66
C
L
=10pf
R
L
=200k
AMI Semiconductor
– Jan. 07, M-20532-003
www.amis.com
10
AMI [ AMI SEMICONDUCTOR ]
