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參數(shù)資料
| 型號(hào)： | ADM2486BRWZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | High Speed, Half-Duplex iCoupler Isolated RS-485 Transceiver |
| 中文描述： | LINE TRANSCEIVER, PDSO16 |
| 封裝： | LEAD FREE, MS013AA, SOIC-16 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 294K |
| 代理商： | ADM2486BRWZ |
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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| ADM2486BRWZ-REEL | 功能描述:IC TXRX RS-485 ISOLATED 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 |
| ADM2487E | 制造商:AD 制造商全稱:Analog Devices 功能描述:2.5 kV Isolated RS-485 Transceivers with Integrated Transformer Driver |
| ADM2487EBRWZ | 功能描述:IC TXRX RS485 ISO W/ESD 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:- 產(chǎn)品培訓(xùn)模塊:RS-232 & USB Transceiver 標(biāo)準(zhǔn)包裝:2,000 系列:- 類型: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:296-19849-2 |
| ADM2487EBRWZ-REEL7 | 功能描述:IC TXRX RS485 ISO W/ESD 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:* 產(chǎn)品培訓(xùn)模塊:RS-232 & USB Transceiver 標(biāo)準(zhǔn)包裝:2,000 系列:- 類型: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:296-19849-2 |
| ADM2490E | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Speed, ESD-Protected, Full-Duplex, iCoupler Isolated RS-485 Transceiver |
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