- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄10807 > ADM3251EARWZ-REEL (Analog Devices Inc)IC LINE DVR/RCVR RS232 20-SOIC PDF資料下載
參數(shù)資料
| 型號(hào)： | ADM3251EARWZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁(yè)數(shù)： | 6/16頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC LINE DVR/RCVR RS232 20-SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Fully Isolated ADM3251E RS-232 Transceiver Power Line Monitoring iCoupler Digital Isolater Technology |
| 特色產(chǎn)品： | ADM3251E Line Driver/Receiver |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | 線路收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 1/1 |
| 規(guī)程： | RS232 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SOIC（0.295"，7.50mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SOIC W |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 產(chǎn)品目錄頁(yè)面： | 790 (CN2011-ZH PDF) |
| 配用： | EVAL-ADM3251EEB1Z-ND - BOARD EVALUATION FOR ADM3251 EVAL-ADM3251EEBZ-ND - BOARD EVALUATION ADM3251 |
| 其它名稱： | ADM3251EARWZ-REELDKR |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)當(dāng)前第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
ADM3251E
Data Sheet
The limitation on the ADM3251E magnetic field immunity is
set by the condition in which induced voltage in the receiving
coil of the transformer is sufficiently large to falsely set or reset
the decoder. The following analysis defines the conditions
under which this can occur.
The pulses at the transformer output have an amplitude of >1.0 V.
The decoder has a sensing threshold of about 0.5 V, thus estab-
lishing a 0.5 V margin in which induced voltages can be tolerated.
The voltage induced across the receiving coil is given by
V = (dβ/dt)Σπrn2; n = 1, 2, … , N
where:
β is the magnetic flux density (gauss).
N is the number of turns in the receiving coil.
rn is the radius of the nth turn in the receiving coil (cm).
Given the geometry of the receiving coil internally and an
imposed requirement that the induced voltage be, at most, 50%
of the 0.5 V margin at the decoder, a maximum allowable
magnetic field is calculated, as shown in Figure 22.
MAGNETIC FIELD FREQUENCY (Hz)
100
M
A
X
IM
U
M
A
LLOWA
B
LE
M
A
GN
E
TIC
FLU
X
DE
NS
IT
Y
(
kg
au
ss)
0.001
1M
10
0.01
1k
10k
10M
0.1
1
100M
100k
07388-
200
Figure 22. 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 approximately
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 of the worst-case polarity), the received pulse is
reduced from >1.0 V to 0.75 V, which is still well above the
0.5 V sensing threshold of the decoder.
The preceding magnetic flux density values correspond to
specific current magnitudes at given distances from the trans-
formers. Figure 23 expresses these allowable current
magnitudes as a function of frequency for selected distances. As
shown in Figure 23, the ADM3251E is extremely immune and
can be affected only by extremely large currents operated at
high frequency very close to the component. For example, at a
magnetic field frequency of 1 MHz, a 0.5 kA current placed
5 mm away from the ADM3251E is required to affect the
operation of the component.
MAGNETIC FIELD FREQUENCY (Hz)
M
AX
IM
UM
AL
L
O
W
ABL
E
CURRE
NT
(
kA)
1k
100
10
1
0.1
0.01
1k
10k
100M
100k
1M
10M
DISTANCE = 5mm
DISTANCE = 1m
DISTANCE = 100mm
07388-
201
Figure 23. Maximum Allowable Current for Various Current-to-ADM3251E
Spacings
In the presence of strong magnetic fields and high frequencies,
any loops formed by PCB traces may induce error voltages
sufficiently large to trigger the thresholds of succeeding
circuitry. Exercise care in the layout of such traces to avoid this
possibility.
ISOLATED POWER SUPPLY CIRCUIT
To operate the ADM3251E with its internal dc-to-dc converter
disabled, connect a voltage of between 3.0 V and 3.7 V to the
VCC pin and apply an isolated power of between 3.0 V and 5.5 V
to the VISO pin, referenced to GNDISO.
A transformer driver circuit with a center-tapped transformer
and LDO can be used to generate the isolated supply, as shown
in Figure 24. The center-tapped transformer provides electrical
isolation of the 5 V power supply. The primary winding of the
transformer is excited with a pair of square waveforms that are
180° out of phase with each other. A pair of Schottky diodes and
a smoothing capacitor are used to create a rectified signal from
the secondary winding. The ADP3330 linear voltage regulator
provides a regulated power supply to the bus side circuitry
ADP3330
IN
NR
+
SD103C
22F
10F
5V
OUT
SD103C
78253
VCC
GND
ISOLATION
BARRIER
SD
ERR
TRANSFORMER
DRIVER
VCC
GND
VISO
GNDISO
ADM3251E
07388-
022
Figure 24. Isolated Power Supply Circuit
Rev. G | Page 14 of 16
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| VE-JW3-MY-S | CONVERTER MOD DC/DC 24V 50W |
| AD8145YCPZ-R7 | IC RECEIVER TRIPLE DIFF 32LFCSP |
| VE-JW2-MY-S | CONVERTER MOD DC/DC 15V 50W |
| VE-BN4-MX-F2 | CONVERTER MOD DC/DC 48V 75W |
| VE-JW1-MY-S | CONVERTER MOD DC/DC 12V 50W |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADM3252E | 制造商:AD 制造商全稱:Analog Devices 功能描述:Isolated, Dual Channel, RS-232 Line Driver/Receiver |
| ADM3252EABCZ | 功能描述:IC LINE DRIVER/RECEIVER 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:* 標(biāo)準(zhǔn)包裝:250 系列:- 類型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:16-TSSOP 包裝:帶卷 (TR) |
| ADM3260ARSZ | 功能描述:I2C Digital Isolator 2500Vrms 2 Channel 25kV/μs CMTI 20-SSOP (0.209", 5.30mm Width) 制造商:analog devices inc. 系列:IsoPower?，iCoupler? 包裝:管件 零件狀態(tài):有效 技術(shù):磁耦合 類型:I2C 隔離式電源:是 通道數(shù):2 輸入 - 輸入側(cè) 1/輸入側(cè) 2:2/2 通道類型:雙向 電壓 - 隔離:2500Vrms 共模瞬態(tài)抗擾度（最小值）:25kV/μs 數(shù)據(jù)速率:- 傳播延遲 tpLH / tpHL（最大值）:- 脈寬失真（最大）:145ns，85ns 上升/下降時(shí)間（典型值）:- 電壓 - 電源:3 V ~ 5.5 V 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商器件封裝:20-SSOP 標(biāo)準(zhǔn)包裝:66 |
| ADM3260ARSZ-RL7 | 功能描述:I2C Digital Isolator 2500Vrms 2 Channel 25kV/μs CMTI 20-SSOP (0.209", 5.30mm Width) 制造商:analog devices inc. 系列:IsoPower?，iCoupler? 包裝:剪切帶（CT） 零件狀態(tài):有效 技術(shù):磁耦合 類型:I2C 隔離式電源:是 通道數(shù):2 輸入 - 輸入側(cè) 1/輸入側(cè) 2:2/2 通道類型:雙向 電壓 - 隔離:2500Vrms 共模瞬態(tài)抗擾度（最小值）:25kV/μs 數(shù)據(jù)速率:- 傳播延遲 tpLH / tpHL（最大值）:- 脈寬失真（最大）:145ns，85ns 上升/下降時(shí)間（典型值）:- 電壓 - 電源:3 V ~ 5.5 V 工作溫度:-40°C ~ 105°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商器件封裝:20-SSOP 標(biāo)準(zhǔn)包裝:1 |
| ADM32845003 | 制造商:LG Corporation 功能描述:Exchanger Assembly |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。