參數(shù)資料
型號(hào)： ADM2486
廠商： Analog Devices, Inc.
英文描述： OPTO ISOLATOR, QUAD
中文描述： 高速，半雙工的iCoupler隔離RS - 485收發(fā)器
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 294K
代理商： ADM2486
ADM2486
Rev. C | Page 17 of 20
ISOLATED POWER SUPPLY CIRCUIT
The ADM2486 requires isolated power capable of 5 V at 100 mA
to be supplied between the VDD2 and GND2 pins. If no suitable
integrated power supply is available, a discrete circuit, such as
the one in Figure 31, can be used. A center-tapped transformer
provides electrical isolation. The primary winding 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 ADP667 linear voltage regulator provides a regulated
power supply to the ADM2486’s bus-side circuitry.
To create the pair of square waves, a D-type flip-flop with
complementary Q/Q outputs is used. The flip-flop can be
connected so that output Q follows the clock input signal. If no
local clock signal is available, a simple digital oscillator can be
implemented with a hex-inverting Schmitt trigger and a resistor
and capacitor. In this case, values of 3.9 k and 1 nF generate a
364 kHz square wave. A pair of discrete NMOS transistors,
switched by the Q/Q flip-flop outputs, conduct current through
the center tap of the primary transformer, winding in an
alternating fashion.
04604-024
ISOLATION
BARRIER
VCC
78253
SD103C
22
F
BS107A
10
F
5V
OUT
IN
SET GND SHDN
VCC
VDD1
VDD2
GND1
GND2
CLK
Q
D
PR
CLR
74HC74A
100nF
VCC
100nF
74HC14A
3.9k
1nF
ADP667
ADM2486
Figure 31. Isolated Power Supply Circuit
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADM2486BRW 功能描述:IC TXRX RS-485 ISOLATED 16-SOIC RoHS:否 類(lèi)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:250 系列:- 類(lèi)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(lèi)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)
ADM2486BRW-REEL 制造商:Analog Devices 功能描述:Single Transmitter/Receiver RS-485 16-Pin SOIC W T/R 制造商:Analog Devices 功能描述:LINE TRNSCVR 1TR 1TX 1RX 16SOIC W - Tape and Reel
ADM2486BRWZ 功能描述:IC TXRX RS-485 ISOLATED 16-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 驅(qū)動(dòng)器，接收器，收發(fā)器 系列:iCoupler® 產(chǎn)品培訓(xùn)模塊:RS-232 & USB Transceiver 標(biāo)準(zhǔn)包裝:2,000 系列:- 類(lèi)型:收發(fā)器 驅(qū)動(dòng)器/接收器數(shù):1/1 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類(lèi)型:表面貼裝 封裝/外殼:16-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:16-SSOP 包裝:帶卷 (TR) 其它名稱(chēng):296-19849-2
ADM2486BRWZ-REEL 功能描述:IC TXRX RS-485 ISOLATED 16SOIC RoHS:是 類(lèi)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(lèi)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(lèi)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
ADM2487E 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:2.5 kV Isolated RS-485 Transceivers with Integrated Transformer Driver
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