AMIS-49200 Datasheet, PDF (7/19 Pages) AMI SEMICONDUCTOR – Fieldbus MAU Chip

AMIS−49200
Transmitter Blocks
Table 7. MDS−MAU INTERFACE
Parameter
Symbol
Min
Typ
Max
Unit
POL Input Pin
POL
See Schmitt Trigger Input Specs
V
TxE Input Pin
TxE
See Schmitt Trigger Input Specs
V
TxS input Pin
TxS
See Schmitt Trigger Input Specs
V
NOTE: The associated MDS chip must handle the jabber detect function.
Table 8. TRI-LEVEL MODULATOR
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
Tri-level Modulator and Slew Control (Output is at VDRV)
Output Voltage
V_O
V_MID
−
3.02
V
Load Current
I_O
DV 10 mV
−35
−
+120
mA
Output for Silence (Note 3)
V_S
TXE Disabled
V_MID + 0.485 V_MID + 0.500 V_MID + 0.515
V
Output for High Level (Note 3)
V_H
TXE Active
V_S + 0.380
V_S + 0.400
V_S + 0.420
V
Output for Low Level (Note 3)
V_L
TXE Active
V_S − 0.420
V_S − 0.400
V_S − 0.380
V
Asymmetry of V_H and V_L
DV_HL
−0.02
−
0.02
V
Rise and Fall Times (Note 4)
tf, tr
C_RT = 22 pF (Note 4)
−
4.7
−
msec
3. Nominal values are: V_S = 2.5 V, V_H = 2.9 V and V_L = 2.1 V.
4. 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 = 2 ms + (0.123 ms/pF * C_RT). C_RT is nominally 22 pF, yielding tf = tr = 4.7 ms. 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
Symbol
Input Common Mode Voltage Range
V_CM
Output Voltage Swing
V_O
Load Current
I_O
Input Offset Voltage
V_OS
Slew Rate
SR
Gain Bandwidth Product
GBW
Phase Margin
PM
Conditions
C_L = 10 pF
R_L = 200 kW
Min
0
1
−2,300
−3
−
−
−
Typ
Max
Unit
−
V_CC − 1
V
−
V_CC − 0.5
V
−
100
mA
−
+3
mV
0.54
−
V/ms
1.15
−
MHz
66
−
Deg
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