AMIS-49250-XTD ON Semiconductor, AMIS-49250-XTD Datasheet - Page 19

• 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
5.3 External Circuitry
Figure 13 shows the external circuitry required to connect the AMIS-492x0 to an IEC 61158-2 conformant network. This schematic is
the circuit that was used to pass the FOUNDATION Fieldbus Physical Layer Conformance test as specified in FOUNDATION Fieldbus
specification FF830, Rev 1.5. This circuit is similar but not identical to the circuit recommended by Yokogawa for the μSAA22Q.
Table 13 lists the four external component values that need to be changed with using the AMIS-492x0 in a circuit that previously used
the μSAA22Q.
Table 13: Passive External Component Value Differences Between the µSAA22Q and the AMIS-492x0
C1 connects to signal CCD (Pin 32) and controls the carrier detect assert and drop-out timing. Particular implementations may require
that the value of C1 be changed to accommodate received signal level changes introduced by the addition of intrinsic safety
components added to the external circuitry. C3 and C4 are part of the receive filter and determine the band pass characteristics of the
receive filter. It is unlikely that these would need to be changed. C8 is a noise filter for VMID. It is important that VMID have as little
noise as possible as it is used as a reference for many sub-circuits in the AMIS-492x0. C8 must be a large capacitor with maximum of
100nf. C8 recommended value is 1μf.
Component
C1
C3
C4
C8
μSAA22Q Value
100pf
100pf
470pf
10nf
Figure 13: AMIS-492x0 Reference Circuit Implementation
Rev. 6 | Page 19 of 22 | www.onsemi.com
AMIS-492x0 Value
150pf
47pf
220pf
1μf