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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)： | 15/22頁 |
| 文件大?。?/td> | 492K |
| 代理商： | AMIS-49200 |
AMIS-49200 Fieldbus MAU
Data Sheet
4.3 Transmit Block
The transmit block contains four sub-blocks:
1. MDS-interface – decodes input signals to generate internal control signals.
2. Tri-level modulator – generates current signals used as inputs to the slew-rate controller.
3. Slew rate controller – converts current to three distinct VDRV voltage levels (V
S
, V
H
, V
L
).
4. Current drive amplifier – op amp designed to drive current drivers for 31.25kbps voltage-mode medium.
4.3.1. MDS-interface
The MDS-interface decodes input signals to generate internal control signals. The POL pin, is used to select the polarity of TxE
(transmit enable). The TxE and TxS (transmit signal) are the MDS-MAU interface signals. These three signals are CMOS logic signals
powered by the V
DD
supply voltage. When POL is connected to GND, TxE is assumed to be active high (positive logic). Likewise, if
POL is connected to V
DD
, TxE is assumed to be active low (negative logic). See Table 11 to see how MDS_CTRL Pin 26 can be used
to control MDS interface operation. The following table shows the resulting VDRV output for the various combinations of interface
signals.
Table 11: MDS-interface Logic
POL
TxE
TxS
VDRV
Low
Low
High
Low
V
H
High
High
V
L
Low
V
H
Low
High
V
L
Low
High
High
V
S
Low
High
V
S
4.3.2. Tri-level Modulator
The tri-level modulator switches current signals into a summing node. The slew rate controller converts the current to a voltage signal,
VDRV. The DC level of silence (V
S
) is nominally 2.5V. Transmission high (V
H
) is nominally 2.9V and transmission low (V
L
) is nominally
2.1V, yielding an amplitude of 0.8V.
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
Active Low
N_Vs
21
1.2K
1.2K
Figure 8: Tri-level Modulator
15
AMI Semiconductor
– Jan. 07, M-20532-003
www.amis.com
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| 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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