AMIS-49250-XTD ON Semiconductor, AMIS-49250-XTD Datasheet - Page 15

• Manufacturer Part Number: AMIS-49250-XTD
• Description: IC TXRX FIELDBUS MAU 44-NQFP
• Manufacturer: ON Semiconductor
• Type: Transceiverr

Specifications of AMIS-49250-XTD

• Number Of Drivers/receivers: 1/1
• Protocol: MDS-MAU
• Voltage - Supply: 4.75 V ~ 6.2 V
• Mounting Type: Surface Mount
• Package / Case: 44-LQFP
• Logic Type: Fieldbus Media Access Unit
• Logic Family: AMIS-492x0
• Number Of Channels Per Chip: 1
• Input Level: CMOS
• Output Level: CMOS
• Output Type: Open Drain
• High Level Output Current: 50 uA
• Low Level Output Current: 50 uA
• Supply Voltage (max): 6.2 V
• Supply Voltage (min): 3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Polarity: Inverting/Non-Inverting
• Number Of Transmitters: 1
• Power Supply Requirement: Dual
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 44
• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: AMIS-49250-XTDOS

AMIS-492x0
4.3.3. Slew Rate Controller
Amplifier (A3), shown in the above figure, controls the slew rate. The amplifier converts the current signals from the tri-level modulator
to a voltage signal, VDRV. It controls its slew rate with a capacitor (C
symmetric and the fall/rise times are determined by the following equation:
The constant part comes from the internal capacitor (not shown). It is recommended to make a guard pattern on your circuit board
around the CRT pin and the hot side of C
4.3.4. Current Drive Amplifier
The drive amplifier is an operational amplifier optimized to drive current drivers for 31.25kbps voltage-mode medium. Its input and
output signals are exposed to allow flexible design of the external driver. Note that this amplifier cannot directly sink the necessary
current from the medium. In the following drive circuit the current (I
following equation.
A diode and/or a resistor connected to the emitter are necessary to shift the DC level of CCOUT and to suppress the loop gain. The
resistance value depends on your design (overall gain and emitter current).
N_VL
N_Vs
400K
20R
RT
I
bus
to avoid unnecessary interference.
=
Tri-Level Modulator
Active Low
t
80K
Rev. 6 | Page 15 of 22 | www.onsemi.com
4R
F
Slew Control
, t
R
[ R
Figure 9: Tri-level Modulator
= 2.0[μs] + 0.12 [μs/pF] × C
&
3
Active Low
V
mid
VMID
80K
4R
(R
- [ R
12
+ R
F
BUS
RT
( R
11
) connected to the CRT pin. The waveform at the VDRV pin is
) through the current-detect resister (R
) ] - [ V
2
VCC
R
20K
A3
R
12
+ R
drv
(R
3
RT
R
2
12
R
) ]
11
+ R
3
R
11
VDRV
CRT
) ]
1.2K
1.2K
1.2K
21
19
F
) is determined by the