参数资料
| 型号： | AMIS-49250-XTD |
| 厂商： | ON Semiconductor |
| 文件页数： | 7/22页 |
| 文件大小： | 0K |
| 描述： | IC TXRX FIELDBUS MAU 44-NQFP |
| 标准包装： | 260 |
| 类型： | 收发器 |
| 驱动器/接收器数： | 1/1 |
| 规程： | MDS-MAU |
| 电源电压： | 4.75 V ~ 6.2 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 44-VFQFN 裸露焊盘 |
| 供应商设备封装： | 44-NQFP（7x7） |
| 包装： | 托盘 |
| 产品目录页面： | 1116 (CN2011-ZH PDF) |
| 其它名称： | 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| AMIS-49250-XTP | 功能描述:总线收发器 AMIS-49250 FIELDBUS MAU T RoHS:否 制造商:Fairchild Semiconductor 逻辑类型:CMOS 逻辑系列:74VCX 每芯片的通道数量:16 输入电平:CMOS 输出电平:CMOS 输出类型:3-State 高电平输出电流:- 24 mA 低电平输出电流:24 mA 传播延迟时间:6.2 ns 电源电压-最大:2.7 V, 3.6 V 电源电压-最小:1.65 V, 2.3 V 最大工作温度:+ 85 C 封装 / 箱体:TSSOP-48 封装:Reel |
| AMIS-492X0 | 制造商:ONSEMI 制造商全称: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 制造商全称:ON Semiconductor 功能描述:Power Line Carrier Modem |
| AMIS-49587_P2 | 制造商:ONSEMI 制造商全称:ON Semiconductor 功能描述:Power Line Carrier Modem |
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