參數(shù)資料
型號(hào): ADM2486BRW
廠商: Analog Devices Inc
文件頁(yè)數(shù): 9/20頁(yè)
文件大小: 0K
描述: IC TXRX RS-485 ISOLATED 16-SOIC
標(biāo)準(zhǔn)包裝: 47
系列: iCoupler®
類(lèi)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: 3V,5V
安裝類(lèi)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
包裝: 管件
其它名稱: Q1893052
Data Sheet
ADM2486
Rev. E | Page 17 of 20
ISOLATED POWER SUPPLY CIRCUIT
The ADM2486 requires isolated power capable of 5 V at up to
approximately 75 mA (this current is dependent on the data
rate and termination resistors used) to be supplied between the
VDD2 and the GND2 pins.
A transformer driver circuit with a center-tapped transformer
and LDO can be used to generate the isolated 5 V supply, as
shown in Figure 32. The center-tapped transformer provides
electrical isolation of the 5 V isolated 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 ADP667
linear voltage regulator provides a regulated 5 V power supply
to the ADM2486’s bus-side circuitry (VDD2).
VCC
ISO 5V
ADP667
IN
10F
100nF
OUT
GND
5V
SET
SD103C
SHDN
VDD1
GND1
VDD2
GND2
ADM2486
22F
78253
ISOLATION BARRIER
TRANSFORMER
DRIVER
04604-
035
100nF
Figure 32. Isolated Power Supply Circuit
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