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參數(shù)資料
| 型號(hào)： | ADM2481BRWZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX ISOLATED RS-485 16SOIC |
| 標(biāo)準(zhǔn)包裝： | 47 |
| 系列： | iCoupler® |
| 類型： | 收發(fā)器，隔離式 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS422/RS485 |
| 電源電壓： | 3.3V，5V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SOIC W |
| 包裝： | 管件 |
Data Sheet
ADM2481
Rev. A | Page 15 of 20
Given the geometry of the receiving coil and an imposed
requirement that the induced voltage is, at most, 50% of the
0.5 V margin at the decoder, a maximum allowable magnetic
field is calculated, as shown in Figure 27.
100.000
10.000
1.000
0.100
0.010
0.001
1k
10k
100k
1M
10M
100M
MAGNETIC FIELD FREQUENCY (Hz)
MA
XI
MU
M
A
LLO
W
ABL
E
M
AG
NE
T
IC
F
L
UX
DE
NS
IT
Y
(
kG
AUS
S
)
08920-
027
Figure 27. Maximum Allowable External Magnetic Flux Density
For example, at a magnetic field frequency of 1 MHz, the
maximum allowable magnetic field of 0.2 kGauss induces a
voltage of 0.25 V at the receiving coil. This is about 50% of the
sensing threshold and does not cause a faulty output transition.
Similarly, if such an event occurs during a transmitted pulse
and is the worst-case polarity, it reduces the received pulse from
>1.0 V to 0.75 V. This is well above the 0.5 V sensing threshold
of the decoder.
These magnetic flux density values are shown in Figure 28,
using more familiar quantities such as maximum allowable
current flow, at given distances away from the ADM2481
transformers.
1000.00
100.00
0.10
1.00
10.00
0.01
1k
10k
100k
1M
10M
100M
MAGNETIC FIELD FREQUENCY (Hz)
MA
XI
MU
M
A
LLO
W
ABL
E
CURRE
NT
(
kA)
DISTANCE = 1m
DISTANCE = 5mm
DISTANCE = 100mm
08920-
028
Figure 28. Maximum Allowable Current for Various
Current-to-ADM2481 Spacings
At combinations of strong magnetic field and high frequency,
any loops formed by printed circuit board traces could induce
large enough error voltages to trigger the thresholds of succeed-
ing circuitry. To avoid this possibility, take care in the layout of
such traces.
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| ADM2481BRWZ-RL7 | 功能描述:IC TXRX ISOLATED RS-485 16SOIC RoHS:是 類別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:iCoupler® 標(biāo)準(zhǔn)包裝:27 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):3/3 規(guī)程:RS232，RS485 電源電壓:4.75 V ~ 5.25 V 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應(yīng)商設(shè)備封裝:28-SOIC 包裝:管件 |
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