AMIS-49200 Datasheet, PDF (4/19 Pages) AMI SEMICONDUCTOR – Fieldbus MAU Chip

AMIS−49200
Table 1. PIN NUMBERS AND SIGNAL DESCRIPTION (continued)
Signal Name Pin No.
I/O
(Note 1)
Description
VCC
18
Analog Supply Analog Supply Voltage
CRT
19
AI/O
Current integration to limit output slew rate
VSS
20
Ground
Ground
VDRV
21
AO
Output of an operational amplifier for slew rate control. This signal can be fed to current
driver.
VSS
22
Ground
Ground
CCINP
23
AI
Non-inverting input of an operational amplifier for transmission current driver
CCINM
24
AI
Inverting input of an operational amplifier for transmission current driver
CCOUT
25
AO
Output of an operational amplifier for transmission current driver
MDS_CTRL
26
AI
For POL = VDD MDS_CTRL should = VSS
For POL = VSS MDS_CTRL can be tied to VDD or used as a not reset to control when
transmit communications will be enabled.
SIGIN
27
AI
Input pin of the band-pass filter. This pin si connected to VMID bias level with 270 kW
resistor.
HPF
28
AI
Feedback signal of high-pass filter. This pin si connected to the output of an op-amp for
high pass filter with 75 kW resistor.
LPF
29
AI
Non-inverting input of an operational amplifier for the low-pass filter
FLT
30
AI
Input pin of low-pass filter for feedback. This pin is connected to the output of the
high-pass filter through 20 kW and the non-inverting input of the low-pass filter through
54 kW resisters.
FLTOUT
31
AO
Output of the operational amplifier for the low-pass filter. This signal is internally
connected to non-inverting input to form a voltage-follower.
CCD
32
AO
Current integration (for carrier detect circuit)
VSS
33
Ground
Ground
RXA
34
DO
MDS−MAU interface signal for received signal activity. This pin is a push-pull output.
RXS
35
DO
MDS−MAU interface signal for received signal. This pin si a push-pull output.
TXE
36
DIS
MDS−MAU interface signal for enable signal transmission (Schmitt Trigger input).
TXS
37
DIS
MDS−MAU interface signal for signal to be transmitted (Schmitt Trigger input).
POL
38
DIS
Selects polarity of TxE input. When this pin is connected to GND, TxE is active high.
When this pin is connected to VDD, TxE is active low.
VSS
39
Ground
Ground
VSS
40
Ground
Ground
VSS
41
Ground
Connect to Ground
VSS
42
Ground
Connect to Ground
VSS
43
Ground
Connect to Ground
VCC
44
Analog Supply Analog Supply Voltage
1. AI = Analog Input, AO = Analog Output, AI/O = Analog Input/Output, DIS = CMOS Digital Input (Schmitt Trigger), DO = CMOS Digital
Output.
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