AMIS-492X0 Datasheet, PDF (6/22 Pages) ON Semiconductor – Fieldbus MAU

AMIS-492x0
Table 1: Pin Numbers and Signal Description
Signal Name Pin No. I/O (Note 1)
VSS
1
Ground
VREF
2
AO
VMID
3
AO
N_PFAIL1
4
AI/O
N_PFAIL2
5
AI/O
SHSETIN
6
AI
SHSET
7
AO
SHUNT
8
AI
VSS/
SGND
9
VSS
10
VSS
11
Ground
Ground
Ground
SRSETIN
12
AI
SRSET
SRAO
SRTR
VO
VDD
VCC
CRT
VSS
VDRV
VSS
CCINP
CCINM
CCOUT
13
AO
14
AO
15
AI
16
AO
17
Digital supply
18
Analog supply
19
AI/O
20
Ground
21
AO
22
Ground
23
AI
24
AI
25
AO
MDS_CTRL
26
AI
SIGIN
27
AI
HPF
28
AI
LPF
29
AI
FLT
30
AI
FLTOUT
31
CCD
32
VSS
33
AO
AO
Ground
Description
Connect to ground
Internal bandgap voltage (1.18V)
2V bias voltage for AC signals
Power fail alarm at VCC input. This pin is an open-drain output of negative logic.
Power fail alarm at VDD input. This pin is an open-drain output of negative logic.
Feedback (non-inverting) input for the shunt regulator
Divided voltage of VCC input. Feeding this voltage to SHSETIN pin results in 5V voltage at
VCC.
Control pin of the shunt regulator. Its sink current (25mA max) is controlled so that the voltage
at SHSETIN is equal to V_REF (1.18V).
The current absorbed by SHUNT pin (25mA max) is fed to this pin, which must be connected to
the ground level
Ground
Ground
Feedback (inverting) input for the series regulator. The series regulator controls its output
(SRAO) to make this input voltage is equal to VREF (1.18V).
Divided voltage of VO output. Feeding this voltage into SRSETIN pin results in 3V at VO pin.
Output pin of an operational amplifier for the series regulator
Gate of a PMOS transistor for the series regulator
Output pin of the series regulator (20mA max)
Supply voltage input for digital block
Analog supply voltage
Current integration to limit output slew rate
Ground
Output of an operational amplifier for slew rate control. This signal can be fed to current driver.
Ground
Non-inverting input of an operational amplifier for transmission current driver
Inverting input of an operational amplifier for transmission current driver
Output of an operational amplifier for transmission current driver
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
Input pin of the band-pass filter. This pin is connected to VMID bias level with 270K resistor.
Feedback signal of high-pass filter. This pin is connected to the output of an op-amp for high
pass filter with 75K resistor.
Non-inverting input of an operational amplifier for the low-pass filter
Input pin of low-pass filter for feedback. This pin is connected to the output of the high-pass
filter through 20kΩ and the non-inverting input of the low-pass filter through 54kΩ resisters.
Output of the operational amplifier for the low-pass filter. This signal is internally connected to
non-inverting input to form a voltage-follower.
Current integration (for carrier detect circuit)
Ground
Rev. 6 | Page 6 of 22 | www.onsemi.com