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| 型號： | AMIS-49250-XTD |
| 廠商： | ON Semiconductor |
| 文件頁數(shù)： | 7/22頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX FIELDBUS MAU 44-NQFP |
| 標準包裝： | 260 |
| 類型： | 收發(fā)器 |
| 驅(qū)動器/接收器數(shù)： | 1/1 |
| 規(guī)程： | MDS-MAU |
| 電源電壓： | 4.75 V ~ 6.2 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 44-NQFP（7x7） |
| 包裝： | 托盤 |
| 產(chǎn)品目錄頁面： | 1116 (CN2011-ZH PDF) |
| 其它名稱： | AMIS-49250-XTDOS |
AMIS-492x0
VDRV
R
20K
20R
400K
CRT
Tri-Level Modulator
&
Slew Control
19
VCC
A3
N_VL
VMID
1.2K
4R
80K
4R
80K
Active Low
N_Vs
21
1.2K
Figure 9: Tri-level Modulator
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 (CRT) connected to the CRT pin. The waveform at the VDRV pin is
symmetric and the fall/rise times are determined by the following equation:
tF, tR = 2.0[μs] + 0.12 [μs/pF] × CRT
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 CRT to avoid unnecessary interference.
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 (IBUS) through the current-detect resister (RF) is determined by the
following equation.
[ R3 Vmid (R12 + R11 ) ] - [ Vdrv (R2 R11 + R3 R11 ) ]
- [ RF ( R2 R12 + R3 R12 ) ]
I bus =
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).
Rev. 6 | Page 15 of 22 | www.onsemi.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| AMIS492X0GEVB | 制造商:ON Semiconductor 功能描述:FIELDBUS EVAL BOARD - Bulk |
| AMIS-49587 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Power Line Carrier Modem |
| AMIS-49587_P2 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Power Line Carrier Modem |
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