參數(shù)資料
型號: AMIS-49200
英文描述: Fieldbus MAU Chip
中文描述: 現(xiàn)場總線MAU芯片
文件頁數(shù): 10/22頁
文件大?。?/td> 492K
代理商: AMIS-49200
AMIS-49200 Fieldbus MAU
Data Sheet
Table 8: Tri-level Modulator
Parameter
Symbol
Min.
Typ.
Max.
Units
Conditions
(Output is at
VDRV)
|
V| 10mV
Tri-level Modulator and Slew Control
Output voltage
Load current
Output for silence
1
V
O
I
O
V
MID
-35
3.02
+120
V
μ
A
V
S
V
MID
+0.485
V
MID
+0.500
V
MID
+0.515
V
TXE disabled
Output for high level
1
V
H
V
S
+0.380
V
S
+0.400
V
S
+0.420
V
TXE active
Output for low level
1
V
L
V
S
-0.420
V
S
-0.400
V
S
-0.380
V
TXE active
Asymmetry of V
H
and V
L
V
HL
-0.02
0.02
V
Note 2
(C
RT
=22pF)
Rise and fall times
2
tf, tr
4.7
μ
sec
Notes:
1.
2.
Nominal values are: V
= 2.5V, V
=2.9V and V
=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
). C
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
Symbol
Min.
Typ.
Max.
Units
Conditions
(Output is at CCOUT)
V
CM
0
V
CC
– 1
V
V
O
1
VCC – 0.5
V
Load current
I
o
-2300
100
μ
A
Input offset voltage
V
OS
-3
+3
mV
Slew rate
SR
0.54
V/
μ
s
Gain bandwidth product
Phase margin
GBW
PM
1.15
66
MHz
Deg
C
L
=10pf
R
L
=200k
10
AMI Semiconductor
– Jan. 07, M-20532-003
www.amis.com
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