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參數(shù)資料
| 型號： | AMIS-49200 |
| 英文描述： | Fieldbus MAU Chip |
| 中文描述： | 現(xiàn)場總線MAU芯片 |
| 文件頁數(shù)： | 16/22頁 |
| 文件大?。?/td> | 492K |
| 代理商： | AMIS-49200 |
AMIS-49200 Fieldbus MAU
Data Sheet
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
RT
) connected to the CRT pin. The waveform at the VDRV pin is
symmetric and the fall/rise times are determined by the following equation:
t
F
, t
R
= 2.0[
μ
s] + 0.12 [
μ
s/pF]
×
C
RT
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
RT
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 (I
BUS
) through the current-detect resister (R
F
) is determined by the
following equation.
I
BUS
= (1/R
F
)
×
(V
DRV
- V
MID
)
×
(R
B
/R
A
).
A diode and/or a resister 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).
CCOUT
25
CCINP
23
CCINM
Current Control
Circuit
24
VCC
A4
I
BUS
VDRV
Vmid
R
A
R
B
R
A
Rf
R
B
Figure 9: Current Control Circuit
4.4 Receive Block
The receive block contains three sub-blocks, which are internally connected:
1. A band pass filter – to filter the desired incoming communication signal.
2. Carrier detector – generates the RxA signal by detecting the signal amplitude.
3. Zero-cross detector generates the RxS signal by detecting the high/low transitions of the Manchester code.
16
AMI Semiconductor
– Jan. 07, M-20532-003
www.amis.com
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相關代理商/技術參數(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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