參數(shù)資料
型號(hào)： AMIS-49200
英文描述： Fieldbus MAU Chip
中文描述： 現(xiàn)場(chǎng)總線MAU芯片
文件頁(yè)數(shù)： 21/22頁(yè)
文件大?。?/td> 492K
代理商： AMIS-49200
AMIS-49200 Fieldbus MAU
Data Sheet
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-49200.
There is one other minor difference in the recommended external circuitry between the
μ
SAA22Q and the AMIS-49200. Figure 13
shows the startup circuits recommended for the
μ
SAA22Q and the AMIS-49200. The circuit shown for the AMIS-49200 is different from
that shown for the
μ
SAA22Q but either one will work. Both are current sources that turn on when power is applied to the H1 segment
terminals so that the AMIS-49200 can turn on without any turn-on transients on the network.
μ
SAA22Q
Startup Circuit
Q1
R6
1 k
R5
100 k
D3
5.1 V
V Shunt
Loop +
Loop +
V Shunt
AMIS 49200
Startup Circuit
Figure 13: Recommended Start-up Circuits
5.4 Active Components
Transistors Q1 – Q4 are ordinary small signal transistors. Diodes D1 and D2 are similarly ordinary small signal diodes. Users desiring
to replace a
μ
SAA22Q with the AMIS-49200 in an existing design should be able to use whatever transistors and diodes were used with
the
μ
SAA22Q. For new designs, the specified transistors can be used or other devices may be chosen.
5.5 Alternative Designs
Some users of the Yokogawa
μ
SAA22Q did not use the exact recommended external circuit for the media interface circuit (see Figure
12). Using the AMIS-49200 that did not follow the Yokogawa recommended external circuit may result in some compatibility problems.
There are an almost infinite number of alternative designs and it is beyond the scope of this document to identify the possible designs
and their possible compatibility problems.
5.6 Verification
All designs using the AMIS-49200 should re-run the entire physical layer conformance test as defined in Fieldbus Foundation document
FF-830, FOUNDATION Specification 31.25 kbit/s Physical Layer Conformance Test. Board layout can alter the behavior of all circuit
implementations, even designs that follow the recommended implementation.
21
AMI Semiconductor
– Jan. 07, M-20532-003
www.amis.com
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
AMIS-49200-XTD 功能描述:總線收發(fā)器 FIELDBUS MAU PHY TRNSCVR RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel
AMIS-49200-XTP 功能描述:總線收發(fā)器 FIELDBUS MAU PHY TRNSCVR RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel
AMIS-49250-XTD 功能描述:總線收發(fā)器 Field Bus MAU Transceiver RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel
AMIS-49250-XTP 功能描述:總線收發(fā)器 AMIS-49250 FIELDBUS MAU T RoHS:否 制造商:Fairchild Semiconductor 邏輯類型:CMOS 邏輯系列:74VCX 每芯片的通道數(shù)量:16 輸入電平:CMOS 輸出電平:CMOS 輸出類型:3-State 高電平輸出電流:- 24 mA 低電平輸出電流:24 mA 傳播延遲時(shí)間:6.2 ns 電源電壓-最大:2.7 V, 3.6 V 電源電壓-最小:1.65 V, 2.3 V 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-48 封裝:Reel
AMIS-492X0 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Fieldbus MAU
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