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參數(shù)資料
| 型號： | EVAL-ADM3054EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL BOARD FOR ADM3054 |
| 特色產(chǎn)品： | Isolated CAN Transcievers |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 主要目的： | 接口，CAN 控制器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | * |
| 次要屬性： | 短路和熱保護(hù) |
| 已供物品： | 板 |
ADM3054
Data Sheet
Rev. B | Page 16 of 20
ELECTRICAL ISOLATION
In the ADM3054, electrical isolation is implemented on the
logic side of the interface. Therefore, the device has two main
sections: a digital isolation section and a transceiver section
(see Figure 29). The driver input signal, which is applied to the
TxD pin and referenced to the logic ground (GND1), is coupled
across an isolation barrier to appear at the transceiver section
referenced to the isolated ground (GND2). Similarly, the receiver
input, which is referenced to the isolated ground in the tran-
sceiver section, is coupled across the isolation barrier to appear
at the RxD pin referenced to the logic ground.
i
Coupler Technology
The digital signals transmit across the isolation barrier using
i
Coupler technology. This technique uses chip scale transformer
windings to couple the digital signals magnetically from one
side of the barrier to the other. Digital inputs are encoded into
waveforms that are capable of exciting the primary transformer
winding. At the secondary winding, the induced waveforms are
decoded into the binary value that was originally transmitted.
Positive and negative logic transitions at the input cause narrow
(~1 ns) pulses to be sent to the decoder via the transformer. The
decoder is bistable and is, therefore, set or reset by the pulses,
indicating input logic transitions. In the absence of logic transitions
at the input for more than ~1 μs, a periodic set of refresh pulses,
indicative of the correct input state, are sent to ensure dc correct-
ness at the output. If the decoder receives no internal pulses for
more than about 5 μs, the input side is assumed to be unpowered
or nonfunctional, in which case the output is forced to a default
state (see Table 9).
Figure 29. Digital Isolation and Transceiver Sections
TxD
RxD
ISOLATION
BARRIER
GND1
DECODE
VDD2SENSE
ENCODE
VREF
VDD1
ADM3054
VOLTAGE
REFERENCE
CAN TRANSCEIVER
LOGIC SIDE
BUS SIDE
VDD2
CANL
CANH
DIGITAL ISOLATION
iCoupler
R
D
VDD2 VOLTAGE
SENSE
THERMAL
SHUTDOWN
GND2
10274-
029
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