AMIS-492X0 Datasheet, PDF (9/22 Pages) ON Semiconductor – Fieldbus MAU

AMIS-492x0
3.3 Transmitter Blocks
Table 7: MDS-MAU Interface
Parameter
MDS-MAU Interface
POL input pin
Symbol
POL
Min.
Typ.
Max.
TxE input pin
TxE
See Schmitt Trigger input specs
TxS input pin
TxS
Note: The associated MDS chip must handle the jabber detect function.
Units Conditions
V
V
V
Table 8: Tri-level Modulator
Parameter
Symbol
Tri-level Modulator and Slew Control
Output voltage
V_O
Load current
I_O
Output for silence ⁽¹⁾
V_S
Min.
V_MID
-35
V_MID+0.485
Typ.
V_MID+0.500
Max.
3.02
+120
V_MID+0.515
Units
V
μA
V
Conditions
(Output is at VDRV)
|∆V| 10mV
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
Rise and fall times ⁽²⁾
tf, tr
4.7
μsec
Note 2
(C_RT= 22pF)
Notes:
1. Nominal values are: V_S = 2.5V, V_H = 2.9V and V_L = 2.1V.
2. 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.
0.54
1.15
66
Max.
V_CC – 1
V_CC – 0.5
100
+3
Units
V
V
μA
mV
V/μs
MHz
Deg
Conditions
(Output is at CCOUT)
C_L= 10pf
R_L= 200k
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